Pub Date : 2025-02-04DOI: 10.1016/j.nima.2025.170266
Pavel G. Shapovalov, Alexey A. Tishchenko
The paper considers the polarization radiation that occurs when an ultrarelativistic electron passes through a fractal cluster. The characteristics of radiation from clusters of different sizes constructed using the diffusion limited aggregation algorithm are numerically calculated. The transformation of the polarization radiation pattern is traced depending on the number of particles in the cluster. The evolution of the asymmetry formation “forward–backward” is clearly observed with an increase in the number of particles making up the fractal cluster.
{"title":"Polarization radiation from a fractal cluster","authors":"Pavel G. Shapovalov, Alexey A. Tishchenko","doi":"10.1016/j.nima.2025.170266","DOIUrl":"10.1016/j.nima.2025.170266","url":null,"abstract":"<div><div>The paper considers the polarization radiation that occurs when an ultrarelativistic electron passes through a fractal cluster. The characteristics of radiation from clusters of different sizes constructed using the diffusion limited aggregation algorithm are numerically calculated. The transformation of the polarization radiation pattern is traced depending on the number of particles in the cluster. The evolution of the asymmetry formation “forward–backward” is clearly observed with an increase in the number of particles making up the fractal cluster.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170266"},"PeriodicalIF":1.5,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-03DOI: 10.1016/j.nima.2025.170273
A. Jaries , J. Ruotsalainen , R. Kronholm , T. Eronen , A. Kankainen
HIBISCUS (Helium-Inflated Beam Improvement Setup that Cools and Undermines Spreads), a new radiofrequency quadrupole cooler-buncher device has been developed and commissioned offline at the Ion Guide Isotope Separator On-Line (IGISOL) facility in Jyväskylä in Finland, as an in-kind contribution for the Facility for Antiproton and Ion Research facility. HIBISCUS improves the ion optical properties of incident low-energy 6 keV beams with the option to have it ultimately extracted in temporally short bunches ( ). This paper provides technical descriptions of its main characteristics, along with a set of optimum working parameters and performance in terms of transmission efficiency, longitudinal energy spread of the cooled ions and temporal width of the extracted bunches.
{"title":"HIBISCUS: A new ion beam radio-frequency quadrupole cooler-buncher for high-precision experiments with exotic radioactive ions","authors":"A. Jaries , J. Ruotsalainen , R. Kronholm , T. Eronen , A. Kankainen","doi":"10.1016/j.nima.2025.170273","DOIUrl":"10.1016/j.nima.2025.170273","url":null,"abstract":"<div><div>HIBISCUS (Helium-Inflated Beam Improvement Setup that Cools and Undermines Spreads), a new radiofrequency quadrupole cooler-buncher device has been developed and commissioned offline at the Ion Guide Isotope Separator On-Line (IGISOL) facility in Jyväskylä in Finland, as an in-kind contribution for the Facility for Antiproton and Ion Research facility. HIBISCUS improves the ion optical properties of incident low-energy 6 keV beams with the option to have it ultimately extracted in temporally short bunches (<span><math><mrow><mo><</mo><mn>1</mn></mrow></math></span> <span><math><mrow><mi>μ</mi><mi>s</mi></mrow></math></span>). This paper provides technical descriptions of its main characteristics, along with a set of optimum working parameters and performance in terms of transmission efficiency, longitudinal energy spread of the cooled ions and temporal width of the extracted bunches.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170273"},"PeriodicalIF":1.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The thermodynamic characteristics of weakly interacting electron gas in CdSe nanoplatelet are theoretically studied. In the Boltzmann approximation, the partition function of the system is precisely calculated, and it is shown that it is expressed through the Ramanujan theta function. The dependences of the entropy and heat capacity on the size of the nanoplatelet are determined. The temperature behavior of the heat capacity of the gas of electrons in low- and high-temperature regions is analyzed.
{"title":"Thermodynamic parameters of the electron gas in CdSe nanoplatelets","authors":"L.A. Tadevosyan , H.Ts. Ghaltaghchyan , V.A. Harutyunyan , Y.Sh. Mamasakhlisov , H.A. Sarkisyan","doi":"10.1016/j.nima.2025.170274","DOIUrl":"10.1016/j.nima.2025.170274","url":null,"abstract":"<div><div>The thermodynamic characteristics of weakly interacting electron gas in CdSe nanoplatelet are theoretically studied. In the Boltzmann approximation, the partition function of the system is precisely calculated, and it is shown that it is expressed through the Ramanujan theta function. The dependences of the entropy and heat capacity on the size of the nanoplatelet are determined. The temperature behavior of the heat capacity of the gas of electrons in low- and high-temperature regions is analyzed.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170274"},"PeriodicalIF":1.5,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-02DOI: 10.1016/j.nima.2025.170272
Sándor R. Kovács , Tibor Norbert Szegedi , Ákos Tóth , Attila Németh , Manoj Kumar Pal , Edit Szilágyi , Mihály Braun , György Gyürky , Zoltán Elekes , Zoltán Halász , Tamás Szücs , Gábor Gyula Kiss
The neutron-rich isotopes with 30 Z 45 are thought to be synthesized in neutrino-driven winds after the collapse of a massive star. This nucleosynthesis scenario, called the weak r-process, is studied using nuclear reaction network calculations. The accuracy of the nucleosynthesis simulations is strongly influenced by the reliability of the nuclear physics input parameters used. Recently, it has been demonstrated that (,n) reactions play a particularly important role in the weak r-process, but their rates – computed from the cross sections – are only known with large uncertainties in the astrophysically relevant temperature range. The half-lives of the products of some key reactions are such that, in principle, the cross sections can be studied using the activation technique. In many cases, however, the -decay of the reaction products leads to the ground state of the daughter nucleus, hence no gamma emission occurs. The purpose of this manuscript is to present our setup with which we determine the cross sections by measuring the yield of -particles emitted during radioactive decay. The 86Kr(,n)89Sr reaction cross-section measurement is used, as a case study.
{"title":"Measurement of β-particles to determine cross sections relevant to the weak r-process","authors":"Sándor R. Kovács , Tibor Norbert Szegedi , Ákos Tóth , Attila Németh , Manoj Kumar Pal , Edit Szilágyi , Mihály Braun , György Gyürky , Zoltán Elekes , Zoltán Halász , Tamás Szücs , Gábor Gyula Kiss","doi":"10.1016/j.nima.2025.170272","DOIUrl":"10.1016/j.nima.2025.170272","url":null,"abstract":"<div><div>The neutron-rich isotopes with 30 <span><math><mo>≤</mo></math></span> Z <span><math><mo>≤</mo></math></span> 45 are thought to be synthesized in neutrino-driven winds after the collapse of a massive star. This nucleosynthesis scenario, called the weak r-process, is studied using nuclear reaction network calculations. The accuracy of the nucleosynthesis simulations is strongly influenced by the reliability of the nuclear physics input parameters used. Recently, it has been demonstrated that (<span><math><mi>α</mi></math></span>,n) reactions play a particularly important role in the weak r-process, but their rates – computed from the cross sections – are only known with large uncertainties in the astrophysically relevant temperature range. The half-lives of the products of some key reactions are such that, in principle, the cross sections can be studied using the activation technique. In many cases, however, the <span><math><mi>β</mi></math></span>-decay of the reaction products leads to the ground state of the daughter nucleus, hence no gamma emission occurs. The purpose of this manuscript is to present our setup with which we determine the cross sections by measuring the yield of <span><math><mi>β</mi></math></span>-particles emitted during radioactive decay. The <sup>86</sup>Kr(<span><math><mi>α</mi></math></span>,n)<sup>89</sup>Sr reaction cross-section measurement is used, as a case study.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170272"},"PeriodicalIF":1.5,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nima.2025.170265
Arthur Clairembaud , Marlene Turner , Patric Muggli
We use numerical simulations to determine whether the saturation length of the self-modulation (SM) instability of a long proton bunch in plasma could be determined by measuring the radius of the bunch halo SM produces. Results show that defocused protons acquire their maximum transverse momentum and exit the wakefields at a distance approximately equal to the saturation length of the wakefields. This suggests that measuring the radius of the halo as a function of plasma length in the AWAKE experiment would yield a very good estimate for the saturation length of SM.
{"title":"Development of self-modulation as a function of plasma length","authors":"Arthur Clairembaud , Marlene Turner , Patric Muggli","doi":"10.1016/j.nima.2025.170265","DOIUrl":"10.1016/j.nima.2025.170265","url":null,"abstract":"<div><div>We use numerical simulations to determine whether the saturation length of the self-modulation (SM) instability of a long proton bunch in plasma could be determined by measuring the radius of the bunch halo SM produces. Results show that defocused protons acquire their maximum transverse momentum and exit the wakefields at a distance approximately equal to the saturation length of the wakefields. This suggests that measuring the radius of the halo as a function of plasma length in the AWAKE experiment would yield a very good estimate for the saturation length of SM.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170265"},"PeriodicalIF":1.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-31DOI: 10.1016/j.nima.2025.170257
S. Miscetti, Mu2e Collaboration
The Mu2e experiment at Fermilab searches for the coherent, neutrino-less conversion of a to e in the Coulomb field of Al nuclei, that represents one of the cleanest Charged Lepton Flavor Violating (CLFV) processes for exploring Beyond the Standard Model (BSM) physics. Mu2e aims to improve previous sensitivity by four orders of magnitude, with a distinctive signature provided by identifying mono-energetic electrons with energy slightly below the muon rest mass. To reach this goal, the experiment will use the highest intensity pulsed muon beam in the world, with up to 6 stopped muons/sec. This is achieved using the Fermilab proton beam and the design and realization of a unique 25 m long superconducting solenoidal system. The high beam intensity relies upon minimizing beam losses in the slow extraction region, indicating an opportunity of using bent crystals for shadowing. A high-resolution straw tracker and a fast CsI crystal calorimeter identify the conversion electron. Both detectors are inserted behind the Stopping Target in the last solenoid section. A Cosmic Ray Veto covers a large part of the solenoids to suppress background produced by cosmic rays. In this paper, we report the details of the experimental layout, the construction status of the magnetic system and detectors, and a short description of the simulation and realization of the bent crystals. Performing crystal channeling in front of the first slow extraction septa will allow beam shadowing and largely reduce beam losses.
{"title":"Status of the Mu2e experiment","authors":"S. Miscetti, Mu2e Collaboration","doi":"10.1016/j.nima.2025.170257","DOIUrl":"10.1016/j.nima.2025.170257","url":null,"abstract":"<div><div>The Mu2e experiment at Fermilab searches for the coherent, neutrino-less conversion of a <span><math><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> to e<span><math><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup></math></span> in the Coulomb field of Al nuclei, that represents one of the cleanest Charged Lepton Flavor Violating (CLFV) processes for exploring Beyond the Standard Model (BSM) physics. Mu2e aims to improve previous sensitivity by four orders of magnitude, with a distinctive signature provided by identifying mono-energetic electrons with energy slightly below the muon rest mass. To reach this goal, the experiment will use the highest intensity pulsed muon beam in the world, with up to 6<span><math><mrow><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>9</mn></mrow></msup></mrow></math></span> stopped muons/sec. This is achieved using the Fermilab proton beam and the design and realization of a unique 25 m long superconducting solenoidal system. The high beam intensity relies upon minimizing beam losses in the slow extraction region, indicating an opportunity of using bent crystals for shadowing. A high-resolution straw tracker and a fast CsI crystal calorimeter identify the conversion electron. Both detectors are inserted behind the Stopping Target in the last solenoid section. A Cosmic Ray Veto covers a large part of the solenoids to suppress background produced by cosmic rays. In this paper, we report the details of the experimental layout, the construction status of the magnetic system and detectors, and a short description of the simulation and realization of the bent crystals. Performing crystal channeling in front of the first slow extraction septa will allow beam shadowing and largely reduce beam losses.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170257"},"PeriodicalIF":1.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-31DOI: 10.1016/j.nima.2025.170250
Y. Hayakawa , K. Hayakawa , S. Kurumi , K. Nogami , T. Sakai , Y. Takahashi , T. Tanaka , M. Yoshikawa
The X-ray source based on parametric X-ray radiation (PXR) has been developed and employed for users studies at the Laboratory for Electron Beam Research and Application (LEBRA), Nihon University. The energy of the PXR beam is limited to 34 keV in the case of using Si(220) as a radiator. Samples made of heavy materials such as lanthanides are difficult to treat for element imaging based on K-shell absorption edges because of the upper limit of the X-ray energy. Therefore, we decided to introduce Si(400) crystals into the LEBRA-PXR source in order to provide a PXR beam above 40 keV for the investigation into protonic ceramic fuel cells (PCFC) containing Ce, La and Ba. The 40-keV PXR beam was successfully observed and the properties are in good agreement with the theoretical calculation of PXR. Although the X-ray yield obtained from Si(400) is relatively low, preliminary experiments on imaging for PCFC samples have been performed with long measurement times.
{"title":"Application of PXR-based X-ray source using a Si(400) radiator in the 40-keV region","authors":"Y. Hayakawa , K. Hayakawa , S. Kurumi , K. Nogami , T. Sakai , Y. Takahashi , T. Tanaka , M. Yoshikawa","doi":"10.1016/j.nima.2025.170250","DOIUrl":"10.1016/j.nima.2025.170250","url":null,"abstract":"<div><div>The X-ray source based on parametric X-ray radiation (PXR) has been developed and employed for users studies at the Laboratory for Electron Beam Research and Application (LEBRA), Nihon University. The energy of the PXR beam is limited to 34 keV in the case of using Si(220) as a radiator. Samples made of heavy materials such as lanthanides are difficult to treat for element imaging based on K-shell absorption edges because of the upper limit of the X-ray energy. Therefore, we decided to introduce Si(400) crystals into the LEBRA-PXR source in order to provide a PXR beam above 40 keV for the investigation into protonic ceramic fuel cells (PCFC) containing Ce, La and Ba. The 40-keV PXR beam was successfully observed and the properties are in good agreement with the theoretical calculation of PXR. Although the X-ray yield obtained from Si(400) is relatively low, preliminary experiments on imaging for PCFC samples have been performed with long measurement times.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170250"},"PeriodicalIF":1.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-31DOI: 10.1016/j.nima.2025.170262
Alexander Liptak , Robert Atwood , Thomas Zillhardt , Stefan Michalik , Genoveva Burca
The high brilliance and coherence of light generated at synchrotron facilities make synchrotron X-ray imaging an invaluable tool for the non-destructive analysis of samples across a range of interdisciplinary sciences. For samples with low attenuation contrast, phase-contrast imaging and phase-retrieval techniques can be used to enhance image contrast and provide complementary phase-shift information. In this work, we demonstrate the phase-contrast imaging capabilities of the Diamond Light Source I12-JEEP beamline using two samples: a fly encased in 4 mm of steel, and a lower chicken leg (drumstick) bones with surrounding soft tissue. Techniques such as X-ray phase-contrast imaging, near-field speckle-based phase-contrast tomography and propagation-based (in-line) phase-contrast tomography are investigated; additionally, the effects of propagation distance, speckle mask material, number of speckle positions, and phase-retrieval algorithm on the quality of radiographic images and reconstructed tomography volumes are compared. The experimental setup, data acquisition settings, as well as phase retrieval and tomography reconstruction parameters are detailed, and concluding remarks are made regarding the strengths and weaknesses of each technique, their use case, and how the data acquisition parameters can be optimised for an extended field-of-view or in-situ imaging setup available at I12.
{"title":"Characterisation of phase-contrast and phase-retrieval X-ray tomography techniques at the I12-JEEP beamline","authors":"Alexander Liptak , Robert Atwood , Thomas Zillhardt , Stefan Michalik , Genoveva Burca","doi":"10.1016/j.nima.2025.170262","DOIUrl":"10.1016/j.nima.2025.170262","url":null,"abstract":"<div><div>The high brilliance and coherence of light generated at synchrotron facilities make synchrotron X-ray imaging an invaluable tool for the non-destructive analysis of samples across a range of interdisciplinary sciences. For samples with low attenuation contrast, phase-contrast imaging and phase-retrieval techniques can be used to enhance image contrast and provide complementary phase-shift information. In this work, we demonstrate the phase-contrast imaging capabilities of the Diamond Light Source I12-JEEP beamline using two samples: a fly encased in 4 mm of steel, and a lower chicken leg (drumstick) bones with surrounding soft tissue. Techniques such as X-ray phase-contrast imaging, near-field speckle-based phase-contrast tomography and propagation-based (in-line) phase-contrast tomography are investigated; additionally, the effects of propagation distance, speckle mask material, number of speckle positions, and phase-retrieval algorithm on the quality of radiographic images and reconstructed tomography volumes are compared. The experimental setup, data acquisition settings, as well as phase retrieval and tomography reconstruction parameters are detailed, and concluding remarks are made regarding the strengths and weaknesses of each technique, their use case, and how the data acquisition parameters can be optimised for an extended field-of-view or in-situ imaging setup available at I12.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170262"},"PeriodicalIF":1.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143234988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-31DOI: 10.1016/j.nima.2025.170258
K. Venugopal , S. Godambe , J. Hariharan , S. Godiyal , N. Mankuzhyil , D. Sarkar , K.K. Singh , C.P. Kushwaha , A. Tolamatti , S. Norlha , R. Thubstan , S.V. Kotwal , Keshavanand , N. Chouhan , V.K. Dhar , K.K. Yadav
MACE (Major atmospheric Cherenkov experiment) is an imaging atmospheric Cherenkov telescope situated at an altitude of 4270 m above sea level in the Himalayan desert region at Hanle, India. It deploys a large light collector of 21 m diameter and an imaging camera with 0.125° pixel resolution at the focal plane. The imaging camera has been designed as a modular structure comprising of 68 camera integrated modules (CIMs). Each CIM contains 16 photomultiplier tubes (PMTs) along with associated electronics and a data acquisition system. In this study, we evaluated the performance of 74 CIMs using an in-house developed test setup and data analysis software. Long-term monitoring of various system health parameters, based on telemetry and event data, indicates steady and consistent performance of CIMs in the camera.
{"title":"Performance characterization of the camera integrated modules for the MACE telescope","authors":"K. Venugopal , S. Godambe , J. Hariharan , S. Godiyal , N. Mankuzhyil , D. Sarkar , K.K. Singh , C.P. Kushwaha , A. Tolamatti , S. Norlha , R. Thubstan , S.V. Kotwal , Keshavanand , N. Chouhan , V.K. Dhar , K.K. Yadav","doi":"10.1016/j.nima.2025.170258","DOIUrl":"10.1016/j.nima.2025.170258","url":null,"abstract":"<div><div>MACE (Major atmospheric Cherenkov experiment) is an imaging atmospheric Cherenkov telescope situated at an altitude of 4270<!--> <!-->m above sea level in the Himalayan desert region at Hanle, India. It deploys a large light collector of 21<!--> <!-->m diameter and an imaging camera with 0.125° pixel resolution at the focal plane. The imaging camera has been designed as a modular structure comprising of 68 camera integrated modules (CIMs). Each CIM contains 16 photomultiplier tubes (PMTs) along with associated electronics and a data acquisition system. In this study, we evaluated the performance of 74 CIMs using an in-house developed test setup and data analysis software. Long-term monitoring of various system health parameters, based on telemetry and event data, indicates steady and consistent performance of CIMs in the camera.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1074 ","pages":"Article 170258"},"PeriodicalIF":1.5,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-30DOI: 10.1016/j.nima.2025.170275
Maksim Kravchenko , Loic Amoudry , Alex Andreev , Nathan Burger , Sergey V. Kutsaev , Alex Murokh , Branco K. Popovic , Alexey Pronikov , Alexander Zholents
Wakefield accelerators, based on THz and mm-wave structures, promise to reach the highest energies in record small footprints. However, operation at such frequencies is associated with strong generation of dipole modes that can destroy the beams, which requires controlling the electron beam position at the micron scale. The existing conventional techniques for electron beam position monitoring are not applicable for sub-THz structures due to the space constraints. On the other hand, if dipole modes amplitudes can be measured precisely at different planes, one can derive beam position relative to the central axis. For such a technique a reliable and cost-effective sensor capable of operating in high repletion rate regime is required. In this paper we review the experimental evaluation of a passive sensor candidate for such applications using RadiaBeam 4.5 MeV photoinjector.
{"title":"Sub-THz passive detector performance evaluation with RadiaBeam photoinjector","authors":"Maksim Kravchenko , Loic Amoudry , Alex Andreev , Nathan Burger , Sergey V. Kutsaev , Alex Murokh , Branco K. Popovic , Alexey Pronikov , Alexander Zholents","doi":"10.1016/j.nima.2025.170275","DOIUrl":"10.1016/j.nima.2025.170275","url":null,"abstract":"<div><div>Wakefield accelerators, based on THz and mm-wave structures, promise to reach the highest energies in record small footprints. However, operation at such frequencies is associated with strong generation of dipole modes that can destroy the beams, which requires controlling the electron beam position at the micron scale. The existing conventional techniques for electron beam position monitoring are not applicable for sub-THz structures due to the space constraints. On the other hand, if dipole modes amplitudes can be measured precisely at different planes, one can derive beam position relative to the central axis. For such a technique a reliable and cost-effective sensor capable of operating in high repletion rate regime is required. In this paper we review the experimental evaluation of a passive sensor candidate for such applications using RadiaBeam 4.5 MeV photoinjector.</div></div>","PeriodicalId":19359,"journal":{"name":"Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment","volume":"1073 ","pages":"Article 170275"},"PeriodicalIF":1.5,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143128867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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