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}
Basically, there is a shortage of face masks during the global breakdown. Face masks are needed to people in all the countries. In public places the officials suggested the use of conventional masks. These are effective, but having few problems such as unable fit on the faces, eight hours lifecycle, Corona Virus Deise-19 viruses livening for 3 days on various surfaces on the masks. In order to overcome these problems 3-dimensional printed mask are very good suitable. In order to avoid these problems use Polylatic Acid (PLA) and anti-microbial Polylatic Acid (PLA) materials for face masks. The mask designed in CATIA software and 3D printed with anti-microbial PLA and PLA materials using Fused Deposition Modeling (FDM) process. Here the PLA and anti-microbial PLA masks are not directly tested and analyzed, but used tensile (ASTM D638) and flexural (ASTM D790) specimens. These specimens modeled and analyzed using CATIA software and printed by FDM machine. Maximum Von misses stress of 8.69e+007 N/m2 is observed in the tensile PLA specimen at the load of 2700N and 9.01e+007 N/m2 in the tensile anti-microbial PLA specimen at 2800N under the simulated condition using CATIA software. Maximum Von misses stress of 9.92e+006 N/m2 in the flexural PLA specimen and1.49e+007N/m2 in the flexural anti-microbial PLA specimen are seen on for the load of120N in the simulation. Using Instron UTM 60Tons, the maximum tensile strength obtained for PLA and anti-bacterial PLA specimens are 36.466MPa and 41.132MPa respectively. Whereas the experimental flexural strength noticed in PLA specimen is 62.67 MPa and anti-bacterial PLA specimens is 91.43 MPa.
{"title":"Design and development of 3D printed anti-microbial face mask by using fused deposition modeling","authors":"D. Devsingh, K. V. Rao, D. U. Chary","doi":"10.1063/5.0058151","DOIUrl":"https://doi.org/10.1063/5.0058151","url":null,"abstract":"Basically, there is a shortage of face masks during the global breakdown. Face masks are needed to people in all the countries. In public places the officials suggested the use of conventional masks. These are effective, but having few problems such as unable fit on the faces, eight hours lifecycle, Corona Virus Deise-19 viruses livening for 3 days on various surfaces on the masks. In order to overcome these problems 3-dimensional printed mask are very good suitable. In order to avoid these problems use Polylatic Acid (PLA) and anti-microbial Polylatic Acid (PLA) materials for face masks. The mask designed in CATIA software and 3D printed with anti-microbial PLA and PLA materials using Fused Deposition Modeling (FDM) process. Here the PLA and anti-microbial PLA masks are not directly tested and analyzed, but used tensile (ASTM D638) and flexural (ASTM D790) specimens. These specimens modeled and analyzed using CATIA software and printed by FDM machine. Maximum Von misses stress of 8.69e+007 N/m2 is observed in the tensile PLA specimen at the load of 2700N and 9.01e+007 N/m2 in the tensile anti-microbial PLA specimen at 2800N under the simulated condition using CATIA software. Maximum Von misses stress of 9.92e+006 N/m2 in the flexural PLA specimen and1.49e+007N/m2 in the flexural anti-microbial PLA specimen are seen on for the load of120N in the simulation. Using Instron UTM 60Tons, the maximum tensile strength obtained for PLA and anti-bacterial PLA specimens are 36.466MPa and 41.132MPa respectively. Whereas the experimental flexural strength noticed in PLA specimen is 62.67 MPa and anti-bacterial PLA specimens is 91.43 MPa.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77378795","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}
{"title":"High-speed hybrid tree multiplier hardware using modified Wallace and Dadda method","authors":"Rashmi Samanth, S. Pooja, S. G. Nayak","doi":"10.1063/5.0057908","DOIUrl":"https://doi.org/10.1063/5.0057908","url":null,"abstract":"","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74395546","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}
Nowadays the government can introduce many new schemes through online and uploaded in their official web portal. Publics can able to access and avail those facilities on internet by reading news and notifications of such schemes. In order to improve their governance the reviews of the public will be very significant. Since these reviews will help the government to take better decisions. By achieving this, the government may get peoples reviews about such schemes. In the existing system reviews such as manual, oral and somewhere online modes were available for facilitating e-government services. But Artificial Intelligence based techniques like facial recognition and sentimental reviews of the public is not incorporated in the current scenario. So in order to facilitate the government to provide better decision the software based deep learning algorithm called Convolution Neural Networks (CNN) is implemented to analysing the sentimental reviews of e-Government services. In this framework three models were developed to implement a concept of multiple CNN models in which first model can recognize people’s hand written digits, second model can detect sentiments from text sentence which can be given by people about government services, third model can detect sentiment from person face image. This paper involves analyze some of the applications to make the user friendly. In order to make the application more accessible and navigations the well-suited browser, need to be selected. The navigations could be done from one screen to the other in sequence and also help the users to reduce the typing action. Using this method, we can reduce the human interventions in the analysing the reviews and consolidated the result which specifies the overall conclusion of the service.
{"title":"Analyze and develop a model for sentimental reviews of e-government services using deep learning algorithms with CNN framework","authors":"S. Alagumuthukrishnan, A. Nirmalkumar, G. Devi","doi":"10.1063/5.0057936","DOIUrl":"https://doi.org/10.1063/5.0057936","url":null,"abstract":"Nowadays the government can introduce many new schemes through online and uploaded in their official web portal. Publics can able to access and avail those facilities on internet by reading news and notifications of such schemes. In order to improve their governance the reviews of the public will be very significant. Since these reviews will help the government to take better decisions. By achieving this, the government may get peoples reviews about such schemes. In the existing system reviews such as manual, oral and somewhere online modes were available for facilitating e-government services. But Artificial Intelligence based techniques like facial recognition and sentimental reviews of the public is not incorporated in the current scenario. So in order to facilitate the government to provide better decision the software based deep learning algorithm called Convolution Neural Networks (CNN) is implemented to analysing the sentimental reviews of e-Government services. In this framework three models were developed to implement a concept of multiple CNN models in which first model can recognize people’s hand written digits, second model can detect sentiments from text sentence which can be given by people about government services, third model can detect sentiment from person face image. This paper involves analyze some of the applications to make the user friendly. In order to make the application more accessible and navigations the well-suited browser, need to be selected. The navigations could be done from one screen to the other in sequence and also help the users to reduce the typing action. Using this method, we can reduce the human interventions in the analysing the reviews and consolidated the result which specifies the overall conclusion of the service.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77648771","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}
Z. Li, D. Li, J. Yang, P. Chen, C. Zuo, F. Song, D. Chen
Collisional-radiative (CR) models are useful to analyze the dynamic process of excited states and support the interpretation of excited population densities measured for example by optical emission spectroscopy (OES). A CR model of atomic hydrogen is described, in which the population densities of the excited states are coupled to the densities of ground state H, H2 and H2+. The three coupling channels, namely excitation of H, dissociative excitation of H2 and dissociative recombination of H2+, usually account for the main contributions to the excited hydrogen atoms in cesium free negative hydrogen ion sources. The population densities of excited hydrogen atom are presented for each channel. They have a similar dependence on electron density for the three channels. Furthermore, the influences of varying electron energy distribution function (EEDF) on the excited state density are discussed. Finally, the described CR model is applied to OES in an ICP hydrogen discharge and the estimated plasma parameters are given.
{"title":"Investigation of the population density of excited atomic hydrogen in negative hydrogen ion sources based on a collisional-radiative model","authors":"Z. Li, D. Li, J. Yang, P. Chen, C. Zuo, F. Song, D. Chen","doi":"10.1063/5.0058485","DOIUrl":"https://doi.org/10.1063/5.0058485","url":null,"abstract":"Collisional-radiative (CR) models are useful to analyze the dynamic process of excited states and support the interpretation of excited population densities measured for example by optical emission spectroscopy (OES). A CR model of atomic hydrogen is described, in which the population densities of the excited states are coupled to the densities of ground state H, H2 and H2+. The three coupling channels, namely excitation of H, dissociative excitation of H2 and dissociative recombination of H2+, usually account for the main contributions to the excited hydrogen atoms in cesium free negative hydrogen ion sources. The population densities of excited hydrogen atom are presented for each channel. They have a similar dependence on electron density for the three channels. Furthermore, the influences of varying electron energy distribution function (EEDF) on the excited state density are discussed. Finally, the described CR model is applied to OES in an ICP hydrogen discharge and the estimated plasma parameters are given.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87533845","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}
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}
The Comprehensive Research Facility for Fusion Technology (CRAFT) is a large scientific programme that is preferentially deployed for the construction of major national science and technology infrastructures. A negative ion-based neutral beam injector (NNBI) with beam energy of 400 keV, beam power of 2 MW and beam duration of 100 s is one of the projects. A radio frequency (RF) based negative beam source was designed for the CRAFT NNBI system. In order to understand the physics and pre-study the engineering problems for RF negative beam sources, a prototype source with a single driver was developed. Recently, this source was tested on a test facility with RF plasma generation, negative ion production and extraction. The long pulse plasma discharge and negative ion beam extraction with a three electrode accelerator were achieved successfully. The extracted ion current is 153 A/m2 with Cs injection and the ratio of electrons to negative ions is around 0.3. It lays good foundations for the R&D of negative ion sources for the CRAFT NNBI system. The details of design and experimental results of the beam source are given in this paper.
{"title":"Research activities of RF-based negative ion source in the ASIPP","authors":"Yahong Xie, Hu Chundong, Wei Jianglong, Gu Yuming, Jiang Caichao, Yongjian Xu, Liang Lizhen, Yuanzhe Zhao, Xie Yuanlai","doi":"10.1063/5.0057461","DOIUrl":"https://doi.org/10.1063/5.0057461","url":null,"abstract":"The Comprehensive Research Facility for Fusion Technology (CRAFT) is a large scientific programme that is preferentially deployed for the construction of major national science and technology infrastructures. A negative ion-based neutral beam injector (NNBI) with beam energy of 400 keV, beam power of 2 MW and beam duration of 100 s is one of the projects. A radio frequency (RF) based negative beam source was designed for the CRAFT NNBI system. In order to understand the physics and pre-study the engineering problems for RF negative beam sources, a prototype source with a single driver was developed. Recently, this source was tested on a test facility with RF plasma generation, negative ion production and extraction. The long pulse plasma discharge and negative ion beam extraction with a three electrode accelerator were achieved successfully. The extracted ion current is 153 A/m2 with Cs injection and the ratio of electrons to negative ions is around 0.3. It lays good foundations for the R&D of negative ion sources for the CRAFT NNBI system. The details of design and experimental results of the beam source are given in this paper.","PeriodicalId":21797,"journal":{"name":"SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020)","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84100338","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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