S. Gajjar, D. Upadhyay, N. Singh, M. Singh, A. Gahlaut, K. Pandya, M. Bhuyan, R. Yadav, H. Tyagi, M. Vuppugalla, A. Thakar, A. Patel, B. Raval, R. Dave, H. Dhola, K. Mehta, N. Goswami, Vikrant Gupta, M. Bandyopadhya, A. Chakraborty, U. Baruah
A solid state High Frequency (HF) 1 MHz, 40 kW source is intended for plasma formation in a neutral beam source by inductive coupling of RF power. An important design feature of such an HF source is its ability to sustain large transient swings of load (due to impedance transition on microsecond time scales). A 40 kW High Frequency Power Supply (HFPS) has been configured with multiple Class-D H-bridge inverters modules by using latest generation switching semiconductors. Each module is capable of delivering 3 kW of power, then magnetic combiners and an LC tuning network provides a 1 MHz sinusoidal output to a 50 Ω standard load. The developed prototype power supply has been coupled to a single-driver RF ion source test bed ROBIN in IPR to characterize the system with actual load conditions. In a recent experimental campaign, tuning of matching network parameters helped to strike and sustain plasma over the pressure range of 1 Pa to 0.42 Pa with forward power of 37 kW to 22 kW. An additional impedance matching network was implemented to map the power supply impedance (50 Ω) with the impedance offered from the source (>90 Ω seen at PS end). A configurable frequency with resolution (∼1 kHz) helped to achieve a power factor close to unity. Experiments helped to study the behavior of the power supply in scenarios of dynamic (plasma) impedance. Auto-tunable frequency for matching the varying load is being implemented in the HF power supply.
{"title":"Experimental results of 40 kW, 1 MHz solid state high frequency power supply with inductively coupled plasma","authors":"S. Gajjar, D. Upadhyay, N. Singh, M. Singh, A. Gahlaut, K. Pandya, M. Bhuyan, R. Yadav, H. Tyagi, M. Vuppugalla, A. Thakar, A. Patel, B. Raval, R. Dave, H. Dhola, K. Mehta, N. Goswami, Vikrant Gupta, M. Bandyopadhya, A. Chakraborty, U. Baruah","doi":"10.1063/5.0057477","DOIUrl":"https://doi.org/10.1063/5.0057477","url":null,"abstract":"A solid state High Frequency (HF) 1 MHz, 40 kW source is intended for plasma formation in a neutral beam source by inductive coupling of RF power. An important design feature of such an HF source is its ability to sustain large transient swings of load (due to impedance transition on microsecond time scales). A 40 kW High Frequency Power Supply (HFPS) has been configured with multiple Class-D H-bridge inverters modules by using latest generation switching semiconductors. Each module is capable of delivering 3 kW of power, then magnetic combiners and an LC tuning network provides a 1 MHz sinusoidal output to a 50 Ω standard load. The developed prototype power supply has been coupled to a single-driver RF ion source test bed ROBIN in IPR to characterize the system with actual load conditions. In a recent experimental campaign, tuning of matching network parameters helped to strike and sustain plasma over the pressure range of 1 Pa to 0.42 Pa with forward power of 37 kW to 22 kW. An additional impedance matching network was implemented to map the power supply impedance (50 Ω) with the impedance offered from the source (>90 Ω seen at PS end). A configurable frequency with resolution (∼1 kHz) helped to achieve a power factor close to unity. Experiments helped to study the behavior of the power supply in scenarios of dynamic (plasma) impedance. Auto-tunable frequency for matching the varying load is being implemented in the HF power supply.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87496031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the transportation sector, circular tubular sections were widely chosen as energy absorbers. Research has shown that the designs made of tubular inversions effectively avoid the bending modes and assist in energy absorption smoothly and gradually, as can be observed from the respective (compressive) force-deflection curves. But metallic tubular inversions usually have low specific energy absorption capacity, due to their weight. The present study explores the use of fiber metal laminate inversions made up of a combination of metal and fiber, with a focus to improve specific energy absorption. The initial metallic design configuration has been proposed based on the packaging volume available. The design has been further improved by the addition of splines as stiffeners. The material of the inversion configuration is then changed to avoid metallic damage. The design has been further improved by the adoption of fiber metal laminates to improve specific energy absorption and ease of manufacturing. The energy absorption calculations have done using finite element analysis methods. The energy absorption capacity of the stepped tube configuration with splines have been compared with that of the fiber metallic laminate configuration and the specific energy absorption capability compared.
{"title":"FML tubular inversion for improved specific energy absorption","authors":"V. Gattineni, V. Nathi","doi":"10.1063/5.0057934","DOIUrl":"https://doi.org/10.1063/5.0057934","url":null,"abstract":"In the transportation sector, circular tubular sections were widely chosen as energy absorbers. Research has shown that the designs made of tubular inversions effectively avoid the bending modes and assist in energy absorption smoothly and gradually, as can be observed from the respective (compressive) force-deflection curves. But metallic tubular inversions usually have low specific energy absorption capacity, due to their weight. The present study explores the use of fiber metal laminate inversions made up of a combination of metal and fiber, with a focus to improve specific energy absorption. The initial metallic design configuration has been proposed based on the packaging volume available. The design has been further improved by the addition of splines as stiffeners. The material of the inversion configuration is then changed to avoid metallic damage. The design has been further improved by the adoption of fiber metal laminates to improve specific energy absorption and ease of manufacturing. The energy absorption calculations have done using finite element analysis methods. The energy absorption capacity of the stepped tube configuration with splines have been compared with that of the fiber metallic laminate configuration and the specific energy absorption capability compared.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86405017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Muthukumaran Ramasamy, Ajith Arul Daniel, D. U. Chary, M. Nithya
Al7050 is distinct among the Al – 7xxx alloy series due to its remarkable features. The rudimentary properties of Al7050 can be improved with the addition of appropriate reinforcing materials to further increase in its adaptability as various structural components. Extensive research is being carried out using different forms (metallic, non-metallic and organic compounds) of reinforcing materials to obtain suitable Aluminium metal matrix composites (AMMC) for specific applications. This review aims to provide an overview of two different reinforcement materials viz., Graphene and Silica utilized in Al7050 MMC and elaborates on the change in characteristics of the composite due to reinforcement inclusion.
{"title":"Aluminium (Al7050) metal matrix composites: A review of reinforcement and mechanical characteristics","authors":"Muthukumaran Ramasamy, Ajith Arul Daniel, D. U. Chary, M. Nithya","doi":"10.1063/5.0058157","DOIUrl":"https://doi.org/10.1063/5.0058157","url":null,"abstract":"Al7050 is distinct among the Al – 7xxx alloy series due to its remarkable features. The rudimentary properties of Al7050 can be improved with the addition of appropriate reinforcing materials to further increase in its adaptability as various structural components. Extensive research is being carried out using different forms (metallic, non-metallic and organic compounds) of reinforcing materials to obtain suitable Aluminium metal matrix composites (AMMC) for specific applications. This review aims to provide an overview of two different reinforcement materials viz., Graphene and Silica utilized in Al7050 MMC and elaborates on the change in characteristics of the composite due to reinforcement inclusion.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86517522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
John Sebert Mampilli, C. S. S. Syam, K. P. A. Jith, A. Rajan, T. R. Rathish, Akash James
A revived interest in space exploration and the requirements of an actively developing commercial market have led to renewed research into the development of new rocket engines that are simpler to build; use and can operate in a wider range of conditions. One such recent development is the interest in methane (CH4) as a rocket fuel. A sub-scale rocket engine using gaseous methane and gaseous oxygen as propellants was designed, with a chamber pressure of 10 bar and mixture ratio of 3:1. A shear co-axial gas-gas fuel injector for the same engine was also designed. Numerical simulation of the performance of the complete engine was carried out. The simulation results shows that the nozzle exit Mach number and pressure close to the analytically calculated values of Mach 2.5 and 0.5 bar, and the mass fraction of methane being depleted within the combustion chamber, indicating complete combustion of the fuel. The design of the fuel injector was an area of particular focus, partly due to the absence of well-documented and validated design data and methodologies, especially for the fuels chosen.
{"title":"Design of methane/oxygen fuelled bipropellant rocket engine","authors":"John Sebert Mampilli, C. S. S. Syam, K. P. A. Jith, A. Rajan, T. R. Rathish, Akash James","doi":"10.1063/5.0058359","DOIUrl":"https://doi.org/10.1063/5.0058359","url":null,"abstract":"A revived interest in space exploration and the requirements of an actively developing commercial market have led to renewed research into the development of new rocket engines that are simpler to build; use and can operate in a wider range of conditions. One such recent development is the interest in methane (CH4) as a rocket fuel. A sub-scale rocket engine using gaseous methane and gaseous oxygen as propellants was designed, with a chamber pressure of 10 bar and mixture ratio of 3:1. A shear co-axial gas-gas fuel injector for the same engine was also designed. Numerical simulation of the performance of the complete engine was carried out. The simulation results shows that the nozzle exit Mach number and pressure close to the analytically calculated values of Mach 2.5 and 0.5 bar, and the mass fraction of methane being depleted within the combustion chamber, indicating complete combustion of the fuel. The design of the fuel injector was an area of particular focus, partly due to the absence of well-documented and validated design data and methodologies, especially for the fuels chosen.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"66 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75751121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Chakravarthy, S. S. Kumar, B. Kedarnath, K. V. Rao
The objective of the task is that to get a novel of reasonable 3D printed prosthetic to see the constraints in Robot-hand and it is wrist-controlled and was powered with voice controlled gadget. So Prosthetic finger with arm models are designed by Fusion 360° and models were fabricated through 3D printer. The client can see each of the fingers, and move it freely. So self-regulating thumb development encouraged object handle. Fingers are controlled through cable mechanism. When the cables are getting compression stress, the fingers are moved to hold the objects.The device weight is less and the size was effectively adaptable. These devices work bowing down the wrist part, and permit the tensioned links to drag the fingers shut. Delivering the wrist permits elastics to get in to rest. Excessive tight of the cable will produce voices. These voices will cut-off the holding of the objects. The voice recognition and fingers movements are very accuracy.This particular model is seen by clients with motion. So in any event some portion of their palm to connect the gadget to accomplish work. In this work, the voice-controlled robot arm was designed, fabricated and tested successfully. Advantages of this arm is simple in designs, printability, ease of assembly, tolerancing, and aesthetics etc., From the output of test results, it can be used for numerous applications of holding weights about 600g to 800g like as carrying groceries, hold a cell phones, throw the balls and open the doors etc. First time the new cable mechanism was introduced for robotic fingers movement, with the help of Very simple design and easy to assemble of robotic arm. The prosthesis was intended for various industrial, engineering and medical applications. A 3D printed wrist-controlled robotic prosthesis gives a financially effective, effectively estimated and exceptionally useful alternative which has been already inaccessible.
{"title":"Design and fabrication of voice controlled robotic arm for prosthetic and numerous applications","authors":"C. Chakravarthy, S. S. Kumar, B. Kedarnath, K. V. Rao","doi":"10.1063/5.0058097","DOIUrl":"https://doi.org/10.1063/5.0058097","url":null,"abstract":"The objective of the task is that to get a novel of reasonable 3D printed prosthetic to see the constraints in Robot-hand and it is wrist-controlled and was powered with voice controlled gadget. So Prosthetic finger with arm models are designed by Fusion 360° and models were fabricated through 3D printer. The client can see each of the fingers, and move it freely. So self-regulating thumb development encouraged object handle. Fingers are controlled through cable mechanism. When the cables are getting compression stress, the fingers are moved to hold the objects.The device weight is less and the size was effectively adaptable. These devices work bowing down the wrist part, and permit the tensioned links to drag the fingers shut. Delivering the wrist permits elastics to get in to rest. Excessive tight of the cable will produce voices. These voices will cut-off the holding of the objects. The voice recognition and fingers movements are very accuracy.This particular model is seen by clients with motion. So in any event some portion of their palm to connect the gadget to accomplish work. In this work, the voice-controlled robot arm was designed, fabricated and tested successfully. Advantages of this arm is simple in designs, printability, ease of assembly, tolerancing, and aesthetics etc., From the output of test results, it can be used for numerous applications of holding weights about 600g to 800g like as carrying groceries, hold a cell phones, throw the balls and open the doors etc. First time the new cable mechanism was introduced for robotic fingers movement, with the help of Very simple design and easy to assemble of robotic arm. The prosthesis was intended for various industrial, engineering and medical applications. A 3D printed wrist-controlled robotic prosthesis gives a financially effective, effectively estimated and exceptionally useful alternative which has been already inaccessible.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76496500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The rise in paper waste from the paper processing sector is becoming the most important issue of disposal by filling large space and polluting the atmosphere, as it rises day to day. To decrease the paper waste as well as environmental emissions, it is recommended to use the paper waste in concrete as Hypo sludge. That contains the properties of cement such as SiO2 & Mg. Cement is the predominant material in concrete. In this research cement is replaced with fly ash as well as hypo sludge. By adding 5percent of fly ash and 0%, 3 %, 6%,9%,12% and 15% of hypo sludge, split tensile strength & compressive strength of concrete as well as Hypo sludge concrete efficiency are being tested. Split tensile strength & compressive strength of hypo sludge concrete are improved by the experiment up to 9% behind this % strength will decrease. In this journal the extension of research work is added that is flexural strength of concrete adding fly ash & hypo sludge in concrete and durability of concrete are studied. Performance of hypo sludge concrete, result and optimum percentage are mentioned in this paper.
{"title":"Study on the performance of concrete with hypo sludge and fly ash as mineral admixture","authors":"M. Reddy, B. Sharada","doi":"10.1063/5.0059180","DOIUrl":"https://doi.org/10.1063/5.0059180","url":null,"abstract":"The rise in paper waste from the paper processing sector is becoming the most important issue of disposal by filling large space and polluting the atmosphere, as it rises day to day. To decrease the paper waste as well as environmental emissions, it is recommended to use the paper waste in concrete as Hypo sludge. That contains the properties of cement such as SiO2 & Mg. Cement is the predominant material in concrete. In this research cement is replaced with fly ash as well as hypo sludge. By adding 5percent of fly ash and 0%, 3 %, 6%,9%,12% and 15% of hypo sludge, split tensile strength & compressive strength of concrete as well as Hypo sludge concrete efficiency are being tested. Split tensile strength & compressive strength of hypo sludge concrete are improved by the experiment up to 9% behind this % strength will decrease. In this journal the extension of research work is added that is flexural strength of concrete adding fly ash & hypo sludge in concrete and durability of concrete are studied. Performance of hypo sludge concrete, result and optimum percentage are mentioned in this paper.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74952195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In Finite Element analysis the size of mesh plays a critical role. It is closely said that accuracy and number of mesh required for the meshing of the element. This paper presents the effect of the von misses and various constraints on the accuracy of the result. On the basis of the papers referred and guidelines obtained for choosing the appropriate mesh size in finite element analysis has been provided and explained about the von misses stress occurred in the model. The web reinforcement should be strengthened enough to carry tension forces as well as compression forces so that the compression wrinkling is avoided. Von mises proves to be the perfect safe value for the designing of composite structures which involves various stress theories and failure criteria.
{"title":"Finite element analysis of composite beams","authors":"T. Kumar, G. Harsha","doi":"10.1063/5.0057910","DOIUrl":"https://doi.org/10.1063/5.0057910","url":null,"abstract":"In Finite Element analysis the size of mesh plays a critical role. It is closely said that accuracy and number of mesh required for the meshing of the element. This paper presents the effect of the von misses and various constraints on the accuracy of the result. On the basis of the papers referred and guidelines obtained for choosing the appropriate mesh size in finite element analysis has been provided and explained about the von misses stress occurred in the model. The web reinforcement should be strengthened enough to carry tension forces as well as compression forces so that the compression wrinkling is avoided. Von mises proves to be the perfect safe value for the designing of composite structures which involves various stress theories and failure criteria.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73938274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Negative ion or atomic anion density measurement is frequently done non-invasively by employing a Cavity Ring-Down Spectroscopy (CRDS) diagnostic system in a negative ion source. The optical cavity in the CRDS system is created by installing two highly reflecting concave mirrors on two collinear opposite ports of the ion source chamber, so that the cavity encloses the plasma as an absorbing medium. In a continuously-fed cesium (Cs)-seeded ion source the CRDS mirror is exposed to Cs vapor environment. As a result, a finite probability of Cs deposition is possible on the mirror surface. In addition, ion sputtering and thermal distortion may degrade the mirror reflectivity and mirror alignment, respectively, during the time of ion source operation. Distorted cavity alignment may affect CRDS functionality. All the above issues increase the mirror loss which can be misinterpreted as absorption losses and lead to an over-estimation of negative ion density for a long ion source operation time. The CRDS sensitivity and accuracy depend on its mirror reflectivity or rather “effective reflectivity”. Since continuous Cs deposition yields a continuous change in mirror reflectivity, the CRDS sensitivity and accuracy also vary in time. A correction factor is needed to take care of the overestimation in negative ion density value if the time difference between the reference instance and measurement instance is significantly large. In this article, an algorithm is presented to find the correction scheme.
{"title":"Correction algorithm for cavity ring-down based anion density measurement in a negative ion source having continuously fed cesium vapor","authors":"D. Mukhopadhyay, M. Bandyopadhyay","doi":"10.1063/5.0057484","DOIUrl":"https://doi.org/10.1063/5.0057484","url":null,"abstract":"Negative ion or atomic anion density measurement is frequently done non-invasively by employing a Cavity Ring-Down Spectroscopy (CRDS) diagnostic system in a negative ion source. The optical cavity in the CRDS system is created by installing two highly reflecting concave mirrors on two collinear opposite ports of the ion source chamber, so that the cavity encloses the plasma as an absorbing medium. In a continuously-fed cesium (Cs)-seeded ion source the CRDS mirror is exposed to Cs vapor environment. As a result, a finite probability of Cs deposition is possible on the mirror surface. In addition, ion sputtering and thermal distortion may degrade the mirror reflectivity and mirror alignment, respectively, during the time of ion source operation. Distorted cavity alignment may affect CRDS functionality. All the above issues increase the mirror loss which can be misinterpreted as absorption losses and lead to an over-estimation of negative ion density for a long ion source operation time. The CRDS sensitivity and accuracy depend on its mirror reflectivity or rather “effective reflectivity”. Since continuous Cs deposition yields a continuous change in mirror reflectivity, the CRDS sensitivity and accuracy also vary in time. A correction factor is needed to take care of the overestimation in negative ion density value if the time difference between the reference instance and measurement instance is significantly large. In this article, an algorithm is presented to find the correction scheme.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"130 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77547444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ivanov, A. Sanin, Y. Belchenko, I. Gusev, I. Emelev, V. Rashchenko, V. Savkin, I. Shchudlo, I. Sorokin, S. Taskaev, P. Zubarev, A. Gmyrya
The source for epithermal neutron production, based on vacuum insulated tandem accelerator (VITA) is under operation at the Budker Institute of Nuclear Physics since 2006. The accelerator provides a high current DС proton beam with energy up to 2 MeV. Numerous improvements to achieve stable tandem work and increase the accelerated proton current were made in more than a decade of experimental operation. These improvements include reduction of the accelerator dark current, modifications for the secondary particles suppression in the tandem gaps, vacuum improvement, upgrades of negative ion source, introduction of additional diagnostics to control and adjust the beam injection and transport. These measures provide the upgraded tandem operation with the accelerated proton current of up 9 mA. Two new schemes of negative ion injection into the tandem were designed and tested. New schemes use the upgraded version of a Penning surface-plasma negative ion source with DС H− beam current of up 15 mA and beam pre-acceleration before injection to tandem. The recent experimental results and its comparison with numerical modelling are presented and discussed.
基于真空绝缘串列加速器(VITA)的超热中子生产源自2006年以来一直在Budker核物理研究所运行。加速器提供高电流DС质子束，能量高达2兆电子伏。在十多年的实验操作中，为了实现稳定的串联工作和增加加速质子电流，进行了许多改进。这些改进包括减少加速器暗电流，改进串联间隙中的二次粒子抑制，改进真空，升级负离子源，引入额外的诊断来控制和调整光束注入和传输。这些措施提供了升级的串联操作，加速质子电流高达9毫安。设计并测试了两种新的负离子注入方案。新方案使用升级版的Penning表面等离子体负离子源，其DС H -束电流高达15 mA，并在注入串联之前进行束预加速。介绍并讨论了最近的实验结果及其与数值模拟的比较。
{"title":"Recent achievements in studies of negative beam formation and acceleration in the tandem accelerator at Budker Institute","authors":"A. Ivanov, A. Sanin, Y. Belchenko, I. Gusev, I. Emelev, V. Rashchenko, V. Savkin, I. Shchudlo, I. Sorokin, S. Taskaev, P. Zubarev, A. Gmyrya","doi":"10.1063/5.0057441","DOIUrl":"https://doi.org/10.1063/5.0057441","url":null,"abstract":"The source for epithermal neutron production, based on vacuum insulated tandem accelerator (VITA) is under operation at the Budker Institute of Nuclear Physics since 2006. The accelerator provides a high current DС proton beam with energy up to 2 MeV. Numerous improvements to achieve stable tandem work and increase the accelerated proton current were made in more than a decade of experimental operation. These improvements include reduction of the accelerator dark current, modifications for the secondary particles suppression in the tandem gaps, vacuum improvement, upgrades of negative ion source, introduction of additional diagnostics to control and adjust the beam injection and transport. These measures provide the upgraded tandem operation with the accelerated proton current of up 9 mA. Two new schemes of negative ion injection into the tandem were designed and tested. New schemes use the upgraded version of a Penning surface-plasma negative ion source with DС H− beam current of up 15 mA and beam pre-acceleration before injection to tandem. The recent experimental results and its comparison with numerical modelling are presented and discussed.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72741586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Shikhovtsev, V. Amirov, K. Anikeeva, V. Davydenko, I. Emelev, A. Ivanov, V. Mishagin, V. Rashchenko, I. Maslakov, E. Shubin
A negative ion source, which utilizes a conversion of primary high current proton beam into negative ions in a gas target via charge-exchange collisions, is under development in Budker Institute, Novosibirsk. The proposed beam will be used for injection into a tandem accelerator, which is a part of the neutron source dedicated for boron-neutron capture therapy (BNCT). The ion source is designed to produce a beam that contains ≥50% of molecular ions. The initial ion beam current is about 1 A at 30 keV energy. After molecular ion dissociation in a gas target, which produces protons with an energy of 15 keV, and further charge-exchange collisions, the beam after the target will contain about 2% of negative ion species with a current in excess of 10 mA. The negative ion beam is then separated by the magnetic field, accelerated up to an energy of 105 keV and enters the tandem accelerator. This paper presents the results of simulations of the beam formation, acceleration and transport. The arrangement of the ion source and corresponding high voltage power supply are also discussed.
{"title":"A 10 mA, steady-state, charge exchange negative ion beam source","authors":"I. Shikhovtsev, V. Amirov, K. Anikeeva, V. Davydenko, I. Emelev, A. Ivanov, V. Mishagin, V. Rashchenko, I. Maslakov, E. Shubin","doi":"10.1063/5.0057483","DOIUrl":"https://doi.org/10.1063/5.0057483","url":null,"abstract":"A negative ion source, which utilizes a conversion of primary high current proton beam into negative ions in a gas target via charge-exchange collisions, is under development in Budker Institute, Novosibirsk. The proposed beam will be used for injection into a tandem accelerator, which is a part of the neutron source dedicated for boron-neutron capture therapy (BNCT). The ion source is designed to produce a beam that contains ≥50% of molecular ions. The initial ion beam current is about 1 A at 30 keV energy. After molecular ion dissociation in a gas target, which produces protons with an energy of 15 keV, and further charge-exchange collisions, the beam after the target will contain about 2% of negative ion species with a current in excess of 10 mA. The negative ion beam is then separated by the magnetic field, accelerated up to an energy of 105 keV and enters the tandem accelerator. This paper presents the results of simulations of the beam formation, acceleration and transport. The arrangement of the ion source and corresponding high voltage power supply are also discussed.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73986205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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