Pub Date : 2015-09-10DOI: 10.1103/PHYSREVSTAB.18.090701
Zhen Zhang, Yuantao Ding, P. Emma, Zhirong Huang, A. Marinelli, Chuanxiang Tang
Two closely spaced electron bunches have attracted strong interest due to their applications in two color X-ray free-electron lasers as well as witness bunch acceleration in plasmas and dielectric structures. In this paper, we propose a new scheme of delay system to vary the time delay up to several picoseconds while not affecting the bunch compression. Numerical simulations based on the Linac Coherent Light Source are performed to demonstrate the feasibility of this method.
{"title":"Flexible pulse delay control up to picosecond for high-intensity twin electron bunches","authors":"Zhen Zhang, Yuantao Ding, P. Emma, Zhirong Huang, A. Marinelli, Chuanxiang Tang","doi":"10.1103/PHYSREVSTAB.18.090701","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.090701","url":null,"abstract":"Two closely spaced electron bunches have attracted strong interest due to their applications in two color X-ray free-electron lasers as well as witness bunch acceleration in plasmas and dielectric structures. In this paper, we propose a new scheme of delay system to vary the time delay up to several picoseconds while not affecting the bunch compression. Numerical simulations based on the Linac Coherent Light Source are performed to demonstrate the feasibility of this method.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80745624","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}
Pub Date : 2015-09-09DOI: 10.1103/PHYSREVSTAB.18.090401
D. Reisman, B. Stoltzfus, W. Stygar, K. Austin, E. Waisman, R. Hickman, J. Davis, T. Haill, M. Knudson, C. Seagle, J. L. Brown, D. Goerz, R. Spielman, J. A. Goldlust, W. R. Cravey
D. B. Reisman, B. S. Stoltzfus, W. A. Stygar, K. N. Austin, E. M. Waisman, R. J. Hickman, J.-P. Davis, T. A. Haill, M. D. Knudson, C. T. Seagle, J. L. Brown, D. A. Goerz, R. B. Spielman, J. A. Goldlust, and W. R. Cravey Sandia National Laboratories, Albuquerque, New Mexico 87185, USA Goerz Engineering Solutions, LLC, Green Bay, Wisconsin 54313, USA Idaho State University, Pocatello, Idaho 83201, USA Dielectric Sciences, Inc., Chelmsford, Massachusetts 01824-3526, USA Alpha-Omega Power Technologies, Albuquerque, New Mexico 87185, USA (Received 12 June 2015; published 9 September 2015)
{"title":"Pulsed power accelerator for material physics experiments","authors":"D. Reisman, B. Stoltzfus, W. Stygar, K. Austin, E. Waisman, R. Hickman, J. Davis, T. Haill, M. Knudson, C. Seagle, J. L. Brown, D. Goerz, R. Spielman, J. A. Goldlust, W. R. Cravey","doi":"10.1103/PHYSREVSTAB.18.090401","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.090401","url":null,"abstract":"D. B. Reisman, B. S. Stoltzfus, W. A. Stygar, K. N. Austin, E. M. Waisman, R. J. Hickman, J.-P. Davis, T. A. Haill, M. D. Knudson, C. T. Seagle, J. L. Brown, D. A. Goerz, R. B. Spielman, J. A. Goldlust, and W. R. Cravey Sandia National Laboratories, Albuquerque, New Mexico 87185, USA Goerz Engineering Solutions, LLC, Green Bay, Wisconsin 54313, USA Idaho State University, Pocatello, Idaho 83201, USA Dielectric Sciences, Inc., Chelmsford, Massachusetts 01824-3526, USA Alpha-Omega Power Technologies, Albuquerque, New Mexico 87185, USA (Received 12 June 2015; published 9 September 2015)","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73141460","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}
Pub Date : 2015-09-04DOI: 10.1103/PHYSREVSTAB.18.091001
H. Sayed, R. Palmer
Muon beams are generated with large transverse and longitudinal emittances. In order to achieve the low emittances required by a muon collider, within the short lifetime of the muons, ionization cooling is required. Cooling schemes have been developed to reduce the muon beam 6D emittances to ≈ 300 μm–rad in transverse and ≈ 1–1.5 mm in longitudinal dimensions. The transverse emittance has to be further reduced to ≈ 50–25 μm–rad with an upper limit on the longitudinal emittance of ≈ 76 mm in order to meet the high-energy muon collider luminosity requirements. Earlier studies of the transverse cooling of low energy muon beams in high field magnets showed a promising performance, but did not include transverse or longitudinal matching between the stages. In this study we present the first complete design of the high field-low energy ionization cooling channel with transverse and longitudinal matching. The channel design was based on strong focusing solenoids with fields of 25–30 T and low momentum muon beam starting at 135 MeV/c and gradually decreasing. The cooling channel design presented here is the first to reach ≈ 50 micron scale emittance beam. As a result, we present the channel’s optimized design parameters including the focusingmore » solenoid fields, absorber parameters and the transverse and longitudinal matching.« less
{"title":"High Field – Low Energy Muon Ionization Cooling Channel","authors":"H. Sayed, R. Palmer","doi":"10.1103/PHYSREVSTAB.18.091001","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.091001","url":null,"abstract":"Muon beams are generated with large transverse and longitudinal emittances. In order to achieve the low emittances required by a muon collider, within the short lifetime of the muons, ionization cooling is required. Cooling schemes have been developed to reduce the muon beam 6D emittances to ≈ 300 μm–rad in transverse and ≈ 1–1.5 mm in longitudinal dimensions. The transverse emittance has to be further reduced to ≈ 50–25 μm–rad with an upper limit on the longitudinal emittance of ≈ 76 mm in order to meet the high-energy muon collider luminosity requirements. Earlier studies of the transverse cooling of low energy muon beams in high field magnets showed a promising performance, but did not include transverse or longitudinal matching between the stages. In this study we present the first complete design of the high field-low energy ionization cooling channel with transverse and longitudinal matching. The channel design was based on strong focusing solenoids with fields of 25–30 T and low momentum muon beam starting at 135 MeV/c and gradually decreasing. The cooling channel design presented here is the first to reach ≈ 50 micron scale emittance beam. As a result, we present the channel’s optimized design parameters including the focusingmore » solenoid fields, absorber parameters and the transverse and longitudinal matching.« less","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84944586","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}
Pub Date : 2015-09-01DOI: 10.1103/PHYSREVSTAB.18.091004
F. Tamura, H. Hotchi, A. Schnase, M. Yoshii, Masanobu Yamamoto, C. Ohmori, M. Nomura, M. Toda, T. Shimada, K. Hasegawa, K. Hara
{"title":"High intensity single bunch operation with heavy periodic transient beam loading in wide band rf cavities","authors":"F. Tamura, H. Hotchi, A. Schnase, M. Yoshii, Masanobu Yamamoto, C. Ohmori, M. Nomura, M. Toda, T. Shimada, K. Hasegawa, K. Hara","doi":"10.1103/PHYSREVSTAB.18.091004","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.091004","url":null,"abstract":"","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75452090","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}
Pub Date : 2015-08-31DOI: 10.1103/PHYSREVSTAB.18.082401
F. Saeidi, R. Pourimani, J. Rahighi, H. Ghasem, M. Rachti
F. Saeidi, R. Pourimani, J. Rahighi, H. Ghasem, and M. Lamehi Rachti Department of Physics, Faculty of Science, Arak University, P.O. Box 8349-8-38156, Arak, Iran Iranian Light Source Facility (ILSF), Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5746, Tehran, Iran School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran (Received 19 May 2015; published 31 August 2015)
F. Saeidi, R. Pourimani, J. Rahighi, H. Ghasem, and M. Lamehi Rachti, Arak大学理学院物理系，8349-8-38156,Arak，伊朗伊朗基础科学研究所(IPM)，邮政信箱19395-5746，德黑兰，伊朗粒子与加速器学院，基础科学研究所(IPM)，邮政信箱19395-5531，德黑兰，伊朗(2015年5月19日收到);2015年8月31日出版)
{"title":"Normal conducting superbend in an ultralow emittance storage ring","authors":"F. Saeidi, R. Pourimani, J. Rahighi, H. Ghasem, M. Rachti","doi":"10.1103/PHYSREVSTAB.18.082401","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.082401","url":null,"abstract":"F. Saeidi, R. Pourimani, J. Rahighi, H. Ghasem, and M. Lamehi Rachti Department of Physics, Faculty of Science, Arak University, P.O. Box 8349-8-38156, Arak, Iran Iranian Light Source Facility (ILSF), Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5746, Tehran, Iran School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran (Received 19 May 2015; published 31 August 2015)","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72562894","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}
Pub Date : 2015-08-31DOI: 10.1103/PHYSREVSTAB.18.082804
A. Cianchi, D. Alesini, M. Anania, A. Bacci, M. Bellaveglia, M. Castellano, E. Chiadroni, D. D. Giovenale, G. Pirro, M. Ferrario, A. Gallo, L. Innocenti, A. Mostacci, R. Pompili, A. Rossi, J. Scifo, V. Shpakov, C. Vaccarezza, F. Villa
Trains of ultrashort electron pulses with THz repetition rate, so-called comblike beams, are assuming an ever growing interest in plasma-based acceleration. In particle-driven plasma wakefield acceleration (PWFA), a train of driver bunches with separation of the order of plasma wavelength, i.e., 300 μm, resonantly excites a plasma wake, which accelerates a trailing witness bunch, injected at the accelerating phase. Comblike beams have great potentialities in different fields of applications. In particular, radiation sources, such as free-electron lasers and THz radiation, take advantage from the possibility to tailor electron beams modulated both in time and energy, to customize emission bandwidth and temporal properties. In these scenarios, the manipulation of longitudinal phase space to investigate different bunch configurations, in terms of energy and time separation, is founded on the knowledge of the 6D phase space of each bunch in the train. In this paper we present the methods developed at the SPARC_LAB test facility in order to fulfill the requirements. Starting from conventional diagnostics, therefore applying well-known tools using more than one diagnostic at the same time, we have completely characterized not only the full 6D phase space of a comblike electron beam with THz repetition rate, but also each single bunch within the train. To our knowledge, this is the first time such a measurement has been performed. Experimental results for multibunch trains in different configurations, suitable for PWFA applications, will be shown and discussed.
{"title":"Six-dimensional measurements of trains of high brightness electron bunches","authors":"A. Cianchi, D. Alesini, M. Anania, A. Bacci, M. Bellaveglia, M. Castellano, E. Chiadroni, D. D. Giovenale, G. Pirro, M. Ferrario, A. Gallo, L. Innocenti, A. Mostacci, R. Pompili, A. Rossi, J. Scifo, V. Shpakov, C. Vaccarezza, F. Villa","doi":"10.1103/PHYSREVSTAB.18.082804","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.082804","url":null,"abstract":"Trains of ultrashort electron pulses with THz repetition rate, so-called comblike beams, are assuming an \u0000ever growing interest in plasma-based acceleration. In particle-driven plasma wakefield acceleration \u0000(PWFA), a train of driver bunches with separation of the order of plasma wavelength, i.e., 300 μm, \u0000resonantly excites a plasma wake, which accelerates a trailing witness bunch, injected at the accelerating \u0000phase. Comblike beams have great potentialities in different fields of applications. In particular, radiation \u0000sources, such as free-electron lasers and THz radiation, take advantage from the possibility to tailor electron \u0000beams modulated both in time and energy, to customize emission bandwidth and temporal properties. In \u0000these scenarios, the manipulation of longitudinal phase space to investigate different bunch configurations, \u0000in terms of energy and time separation, is founded on the knowledge of the 6D phase space of each bunch in \u0000the train. In this paper we present the methods developed at the SPARC_LAB test facility in order to fulfill \u0000the requirements. Starting from conventional diagnostics, therefore applying well-known tools using more \u0000than one diagnostic at the same time, we have completely characterized not only the full 6D phase space \u0000of a comblike electron beam with THz repetition rate, but also each single bunch within the train. To our \u0000knowledge, this is the first time such a measurement has been performed. Experimental results for \u0000multibunch trains in different configurations, suitable for PWFA applications, will be shown and discussed.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83432676","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}
Pub Date : 2015-08-31DOI: 10.1103/PHYSREVSTAB.18.080701
Yen-Chieh Huang, Zhen Zhang, Chia-Hsiang Chen, Ming Wu
When a short electron bunch traverses an undulator to radiate a wavelength longer than the bunch length, intense superradiance from the electron bunch can quickly deplete the electron’s kinetic energy and lead to generation of an isolated chirped radiation pulse. Here, we develop a theory to describe this novel chirped pulse radiation in a superradiant free-electron laser and show the opportunity to generate isolated few-cycle high-power radiation through chirped-pulse compression after the undulator. The theory is completely characterized by how fast the electron energy is depleted for a given length of an undulator. We further present two design examples at the THz and extreme-ultraviolet wavelengths and numerically generate isolated three- and nine-cycle radiation pulses, respectively.
{"title":"Isolated few-cycle radiation from chirped-pulse compression of a superradiant free-electron laser","authors":"Yen-Chieh Huang, Zhen Zhang, Chia-Hsiang Chen, Ming Wu","doi":"10.1103/PHYSREVSTAB.18.080701","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.080701","url":null,"abstract":"When a short electron bunch traverses an undulator to radiate a wavelength longer than the bunch length, intense superradiance from the electron bunch can quickly deplete the electron’s kinetic energy and lead to generation of an isolated chirped radiation pulse. Here, we develop a theory to describe this novel chirped pulse radiation in a superradiant free-electron laser and show the opportunity to generate isolated few-cycle high-power radiation through chirped-pulse compression after the undulator. The theory is completely characterized by how fast the electron energy is depleted for a given length of an undulator. We further present two design examples at the THz and extreme-ultraviolet wavelengths and numerically generate isolated three- and nine-cycle radiation pulses, respectively.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72836694","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}
Pub Date : 2015-08-31DOI: 10.1103/PHYSREVSTAB.18.081304
G. Wittig, O. Karger, A. Knetsch, Y. Xi, A. Deng, J. Rosenzweig, D. Bruhwiler, J. Smith, G. Manahan, Z. Sheng, D. Jaroszynski, B. Hidding
A novel, flexible method of witness electron bunch generation in plasma wakefield accelerators is described. A quasistationary plasma region is ignited by a focused laser pulse prior to the arrival of the plasma wave. This localized, shapeable optical plasma torch causes a strong distortion of the plasma blowout during passage of the electron driver bunch, leading to collective alteration of plasma electron trajectories and to controlled injection. This optically steered injection is more flexible and faster when compared to hydrodynamically controlled gas density transition injection methods.
{"title":"Optical plasma torch electron bunch generation in plasma wakefield accelerators","authors":"G. Wittig, O. Karger, A. Knetsch, Y. Xi, A. Deng, J. Rosenzweig, D. Bruhwiler, J. Smith, G. Manahan, Z. Sheng, D. Jaroszynski, B. Hidding","doi":"10.1103/PHYSREVSTAB.18.081304","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.081304","url":null,"abstract":"A novel, flexible method of witness electron bunch generation in plasma wakefield accelerators is described. A quasistationary plasma region is ignited by a focused laser pulse prior to the arrival of the plasma wave. This localized, shapeable optical plasma torch causes a strong distortion of the plasma blowout during passage of the electron driver bunch, leading to collective alteration of plasma electron trajectories and to controlled injection. This optically steered injection is more flexible and faster when compared to hydrodynamically controlled gas density transition injection methods.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86167854","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}
Pub Date : 2015-08-27DOI: 10.1103/PHYSREVSTAB.18.082802
R. Ischebeck, E. Prat, V. Thominet, C. O. Loch
A transverse profile imager for ultrabright electron beams is presented, which overcomes resolution issues in present designs by observing the Scheimpflug imaging condition as well as the Snell-Descartes law of refraction in the scintillating crystal. Coherent optical transition radiation emitted by highly compressed electron bunches on the surface of the crystal is directed away from the camera, allowing to use the monitor for profile measurements of electron bunches suitable for X-ray free electron lasers. The optical design has been verified by ray tracing simulations, and the angular dependency of the resolution has been verified experimentally. An instrument according to the presented design principles has been used in the SwissFEL Injector Test Facility, and different scintillator materials have been tested. Measurements in conjunction with a transverse deflecting radiofrequency structure and an array of quadrupole magnets demonstrate a normalized slice emittance of 25 nm in the core of a 30 fC electron beam at a pulse length of 10 ps and a particle energy of 230 MeV.
{"title":"Transverse profile imager for ultrabright electron beams","authors":"R. Ischebeck, E. Prat, V. Thominet, C. O. Loch","doi":"10.1103/PHYSREVSTAB.18.082802","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.082802","url":null,"abstract":"A transverse profile imager for ultrabright electron beams is presented, which overcomes resolution issues in present designs by observing the Scheimpflug imaging condition as well as the Snell-Descartes law of refraction in the scintillating crystal. Coherent optical transition radiation emitted by highly compressed electron bunches on the surface of the crystal is directed away from the camera, allowing to use the monitor for profile measurements of electron bunches suitable for X-ray free electron lasers. The optical design has been verified by ray tracing simulations, and the angular dependency of the resolution has been verified experimentally. An instrument according to the presented design principles has been used in the SwissFEL Injector Test Facility, and different scintillator materials have been tested. Measurements in conjunction with a transverse deflecting radiofrequency structure and an array of quadrupole magnets demonstrate a normalized slice emittance of 25 nm in the core of a 30 fC electron beam at a pulse length of 10 ps and a particle energy of 230 MeV.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85182425","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}
Pub Date : 2015-08-24DOI: 10.1103/PhysRevSTAB.18.122801
T. Hofmann, K. Kruchinin, A. Bosco, S. Gibson, F. Roncarolo, G. Boorman, U. Raich, E. Bravin, J. Pozimski, A. Letchford, C. Gabor
A non-invasive, compact laserwire system has been developed to measure the transverse emittance of an H- beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN. Light from a low power, pulsed laser source is conveyed via fibre to collide with the H- beam, a fraction of which is neutralized and then intercepted by a downstream diamond detector. Scanning the focused laser across the H- beam and measuring the distribution of the photo-neutralized particles enables the transverse emittance to be reconstructed. The vertical phase-space distribution of a 3 MeV beam during LINAC4 commissioning has been measured by the laserwire and verified with a conventional slit and grid method.
{"title":"Demonstration of a laserwire emittance scanner for hydrogen ion beams at CERN","authors":"T. Hofmann, K. Kruchinin, A. Bosco, S. Gibson, F. Roncarolo, G. Boorman, U. Raich, E. Bravin, J. Pozimski, A. Letchford, C. Gabor","doi":"10.1103/PhysRevSTAB.18.122801","DOIUrl":"https://doi.org/10.1103/PhysRevSTAB.18.122801","url":null,"abstract":"A non-invasive, compact laserwire system has been developed to measure the transverse emittance of an H- beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN. Light from a low power, pulsed laser source is conveyed via fibre to collide with the H- beam, a fraction of which is neutralized and then intercepted by a downstream diamond detector. Scanning the focused laser across the H- beam and measuring the distribution of the photo-neutralized particles enables the transverse emittance to be reconstructed. The vertical phase-space distribution of a 3 MeV beam during LINAC4 commissioning has been measured by the laserwire and verified with a conventional slit and grid method.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88435008","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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