Pub Date : 2015-05-29DOI: 10.1103/PHYSREVSTAB.18.054001
V. Ziemann
We calculate the orbit response coefficients for an arbitrarily coupled storage ring subject to maintaining the orbit length constant due to the presence of a radio-frequency system.
我们计算了任意耦合存储环的轨道响应系数，但由于存在射频系统而保持轨道长度不变。
{"title":"Response matrices in strongly coupled storage rings with a radio-frequency system constraining the revolution time","authors":"V. Ziemann","doi":"10.1103/PHYSREVSTAB.18.054001","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.054001","url":null,"abstract":"We calculate the orbit response coefficients for an arbitrarily coupled storage ring subject to maintaining the orbit length constant due to the presence of a radio-frequency system.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76756622","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 : 2015-05-21DOI: 10.1103/PHYSREVSTAB.18.050703
D. Ratner, E. Hemsing, A. Gover, A. Marinelli, A. Nause
The phenomenon of Dicke’s subradiance, in which the collective properties of a system suppress radiation, has received broad interest in atomic physics. Recent theoretical papers in the field of relativistic electron beams have proposed schemes to achieve subradiance through suppression of shot noise current fluctuations. The resulting “quiet” beam generates less spontaneous radiation than emitted even by a shot noise beam when oscillating in an undulator. Quiet beams could have diverse accelerator applications, including lowering power requirements for seeded free-electron lasers and improving efficiency of hadron cooling. In this paper we present experimental observation of a strong reduction in undulator radiation, demonstrating the feasibility of noise suppression as a practical tool in accelerator physics.
{"title":"Subradiant spontaneous undulator emission through collective suppression of shot noise","authors":"D. Ratner, E. Hemsing, A. Gover, A. Marinelli, A. Nause","doi":"10.1103/PHYSREVSTAB.18.050703","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050703","url":null,"abstract":"The phenomenon of Dicke’s subradiance, in which the collective properties of a system suppress radiation, has received broad interest in atomic physics. Recent theoretical papers in the field of relativistic electron beams have proposed schemes to achieve subradiance through suppression of shot noise current fluctuations. The resulting “quiet” beam generates less spontaneous radiation than emitted even by a shot noise beam when oscillating in an undulator. Quiet beams could have diverse accelerator applications, including lowering power requirements for seeded free-electron lasers and improving efficiency of hadron cooling. In this paper we present experimental observation of a strong reduction in undulator radiation, demonstrating the feasibility of noise suppression as a practical tool in accelerator physics.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86921429","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 : 2015-05-18DOI: 10.1103/PHYSREVSTAB.18.050102
W. Barth, A. Adonin, S. Appel, P. Gerhard, M. Heilmann, F. Heymach, R. Hollinger, W. Vinzenz, H. Vormann, S. Yaramyshev
A significant part of the experimental program at Facility for Antiproton and Ion Research (FAIR) is dedicated to pbar physics requiring a high number of cooled pbars per hour. The primary proton beam has to be provided by a 70 MeV proton linac followed by two synchrotrons. The new FAIR proton linac will deliver a pulsed proton beam of up to 35 mA of $36text{ }text{ }ensuremath{mu}mathrm{s}$ duration at a repetition rate of 4 Hz (maximum). The GSI heavy ion linac (UNILAC) is able to deliver world record uranium beam intensities for injection into the synchrotrons, but it is not suitable for FAIR relevant proton beam operation. In an advanced machine investigation program it could be shown that the UNILAC is able to provide for sufficient high intensities of ${mathrm{CH}}_{3}$ beam, cracked (and stripped) in a supersonic nitrogen gas jet into protons and carbon ions. This advanced operational approach will result in up to 3 mA of proton intensity at a maximum beam energy of 20 MeV, $100text{ }text{ }ensuremath{mu}mathrm{s}$ pulse duration and a repetition rate of up to 2.7 Hz delivered to the synchrotron SIS18. Recent linac beam measurements will be presented, showing that the UNILAC is able to serve as a proton FAIR injector for the first time, while the performance is limited to 25% of the FAIR requirements.
{"title":"Heavy ion linac as a high current proton beam injector","authors":"W. Barth, A. Adonin, S. Appel, P. Gerhard, M. Heilmann, F. Heymach, R. Hollinger, W. Vinzenz, H. Vormann, S. Yaramyshev","doi":"10.1103/PHYSREVSTAB.18.050102","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050102","url":null,"abstract":"A significant part of the experimental program at Facility for Antiproton and Ion Research (FAIR) is dedicated to pbar physics requiring a high number of cooled pbars per hour. The primary proton beam has to be provided by a 70 MeV proton linac followed by two synchrotrons. The new FAIR proton linac will deliver a pulsed proton beam of up to 35 mA of $36text{ }text{ }ensuremath{mu}mathrm{s}$ duration at a repetition rate of 4 Hz (maximum). The GSI heavy ion linac (UNILAC) is able to deliver world record uranium beam intensities for injection into the synchrotrons, but it is not suitable for FAIR relevant proton beam operation. In an advanced machine investigation program it could be shown that the UNILAC is able to provide for sufficient high intensities of ${mathrm{CH}}_{3}$ beam, cracked (and stripped) in a supersonic nitrogen gas jet into protons and carbon ions. This advanced operational approach will result in up to 3 mA of proton intensity at a maximum beam energy of 20 MeV, $100text{ }text{ }ensuremath{mu}mathrm{s}$ pulse duration and a repetition rate of up to 2.7 Hz delivered to the synchrotron SIS18. Recent linac beam measurements will be presented, showing that the UNILAC is able to serve as a proton FAIR injector for the first time, while the performance is limited to 25% of the FAIR requirements.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89104061","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 : 2015-05-18DOI: 10.1103/PHYSREVSTAB.18.050702
F. Zhou, K. Bane, Yuantao Ding, Zhirong Huang, H. Loos, T. Raubenheimer
A collimator located in a magnetic bunch compressor of a linear accelerator driven x-ray free electron laser has many potential applications, such as the removal of horns in the current distribution, the generation of ultrashort beams, and as a diagnostic of the beam slice emittance. Collective effects, however, are a major concern in applying the technique. Systematic measurements of emittance and analysis were performed using a collimator in the first bunch compressor of the Linac Coherent Light Source (LCLS). In the nominal, undercompressed configuration using the collimator we find that the y emittance (nonbending plane) is not increased, and the x emittance (in the bending plane) is increased by about 25%, in comparison to the injector emittance. From the analysis we conclude that the parasitic effects associated with this method are dominated by coherent synchrotron radiation (CSR), which causes a “systematic error” for measuring slice emittance at the bending plane using the collimation method. In general, we find good agreement between the measurements and simulations including CSR. However, for overcompressed beams at smaller collimator gaps, an extra emittance increase is found that does not agree with 1D simulations and is not understood.
{"title":"Measurements and Analysis of a High-Brightness Electron Beam Collimated in a Magnetic Bunch Compressor","authors":"F. Zhou, K. Bane, Yuantao Ding, Zhirong Huang, H. Loos, T. Raubenheimer","doi":"10.1103/PHYSREVSTAB.18.050702","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050702","url":null,"abstract":"A collimator located in a magnetic bunch compressor of a linear accelerator driven x-ray free electron laser has many potential applications, such as the removal of horns in the current distribution, the generation of ultrashort beams, and as a diagnostic of the beam slice emittance. Collective effects, however, are a major concern in applying the technique. Systematic measurements of emittance and analysis were performed using a collimator in the first bunch compressor of the Linac Coherent Light Source (LCLS). In the nominal, undercompressed configuration using the collimator we find that the y emittance (nonbending plane) is not increased, and the x emittance (in the bending plane) is increased by about 25%, in comparison to the injector emittance. From the analysis we conclude that the parasitic effects associated with this method are dominated by coherent synchrotron radiation (CSR), which causes a “systematic error” for measuring slice emittance at the bending plane using the collimation method. In general, we find good agreement between the measurements and simulations including CSR. However, for overcompressed beams at smaller collimator gaps, an extra emittance increase is found that does not agree with 1D simulations and is not understood.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79096081","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 : 2015-05-18DOI: 10.1103/PHYSREVSTAB.18.051002
R. Cimino, L. A. González, G. Iadarola, R. Larciprete, A. Romano, G. Rumolo
The detailed study of the low energy Secondary Electron Yield (LE-SEY) of technical Cu for very low electron landing energies (from 0 to 30 eV) is very important for electron cloud build up in high intensity accelerators and in many other fields of research. However, LE-SEY has been rarely addressed due to the intrinsic experimental complexity to control very low energy electrons. Furthermore, several results published in the past have been recently questioned for allegedly suering from experimental systematics. Here, we critically review the experimental method used to study LE - SEY and define more precise energy regions, in which the experimental data can be considered valid. E-cloud simulations are than performed to address the impact of such results on electron cloud predictions in the LHC.
{"title":"Detailed investigation of the low energy secondary electron yield of technical Cu and its relevance for the LHC","authors":"R. Cimino, L. A. González, G. Iadarola, R. Larciprete, A. Romano, G. Rumolo","doi":"10.1103/PHYSREVSTAB.18.051002","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.051002","url":null,"abstract":"The detailed study of the low energy Secondary Electron Yield (LE-SEY) of technical Cu for very low electron landing energies (from 0 to 30 eV) is very important for electron cloud build up in high intensity accelerators and in many other fields of research. However, LE-SEY has been rarely addressed due to the intrinsic experimental complexity to control very low energy electrons. Furthermore, several results published in the past have been recently questioned for allegedly suering from experimental systematics. Here, we critically review the experimental method used to study LE - SEY and define more precise energy regions, in which the experimental data can be considered valid. E-cloud simulations are than performed to address the impact of such results on electron cloud predictions in the LHC.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89670438","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 : 2015-05-15DOI: 10.1103/PHYSREVSTAB.18.054201
Fang Yan, S. Pei, H. Geng, C. Meng, Yaliang Zhao, Biao Sun, P. Cheng, Zheng Yang, H. Ouyang, Zhihui Li, Jingyu Tang, Jianli Wang, Y. Sui, J. Dai, P. Sha, R. Ge
The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The injector is composed of two parts, the linac part and the beam dump line. The former is designed on the basis of 325 MHz four-vane type copper structure radio frequency quadrupole and superconducting (SC) spoke cavities with beta = 0.12. The latter is designed to transport the beamcoming out of the SC section of the linac to the beam dump, where the beam transverse profile is fairly enlarged and unformed to simplify the beam target design. The SC section consists of two cryomodules with 14 beta = 0.12 Spoke cavities, 14 solenoid and 14 BPMs in total. The first challenge in the physics design comes from the necessary space required for the cryomodule separation where the periodical lattice is destroyed at a relatively lower energy of similar to 5 MeV. Another challenge is the beam dump line design, as it will be the first beam dump line being built by using a step field magnet for the transverse beam expansion and uniformity in the world. This paper gives an overview of the physics design study together with the design principles and machine construction considerations. The results of an optimized design, fabrication status and end to end simulations including machine errors are presented.
{"title":"Physics design of a 10 MeV injector test stand for an accelerator-driven subcritical system","authors":"Fang Yan, S. Pei, H. Geng, C. Meng, Yaliang Zhao, Biao Sun, P. Cheng, Zheng Yang, H. Ouyang, Zhihui Li, Jingyu Tang, Jianli Wang, Y. Sui, J. Dai, P. Sha, R. Ge","doi":"10.1103/PHYSREVSTAB.18.054201","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.054201","url":null,"abstract":"The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The injector is composed of two parts, the linac part and the beam dump line. The former is designed on the basis of 325 MHz four-vane type copper structure radio frequency quadrupole and superconducting (SC) spoke cavities with beta = 0.12. The latter is designed to transport the beamcoming out of the SC section of the linac to the beam dump, where the beam transverse profile is fairly enlarged and unformed to simplify the beam target design. The SC section consists of two cryomodules with 14 beta = 0.12 Spoke cavities, 14 solenoid and 14 BPMs in total. The first challenge in the physics design comes from the necessary space required for the cryomodule separation where the periodical lattice is destroyed at a relatively lower energy of similar to 5 MeV. Another challenge is the beam dump line design, as it will be the first beam dump line being built by using a step field magnet for the transverse beam expansion and uniformity in the world. This paper gives an overview of the physics design study together with the design principles and machine construction considerations. The results of an optimized design, fabrication status and end to end simulations including machine errors are presented.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80806985","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 : 2015-05-11DOI: 10.1103/PHYSREVSTAB.18.054401
M. Venturini, J. Qiang
We identify a new mechanism for generation of the microbunching instability that involves the transverse rather than the longitudinal component of the self-fields.We introduce an analytical model that captures the essential features of the effect and use the model to interpret results from recent LCLS-II design studies.
{"title":"Transverse space-charge induced microbunching instability in high-brightness electron bunches","authors":"M. Venturini, J. Qiang","doi":"10.1103/PHYSREVSTAB.18.054401","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.054401","url":null,"abstract":"We identify a new mechanism for generation of the microbunching instability that involves the transverse rather than the longitudinal component of the self-fields.We introduce an analytical model that captures the essential features of the effect and use the model to interpret results from recent LCLS-II design studies.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77450898","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 : 2015-05-08DOI: 10.1103/PHYSREVSTAB.18.052801
D. Sergeeva, A. Tishchenko, M. Strikhanov
Smith-Purcell radiation is a well-known phenomenon, which provides a noninvasive scheme for diagnostics of charged particle beams and is used as an effective source of electromagnetic waves, e.g., in the orotron, the free electron laser, etc. In this paper we develop the theory of Smith-Purcell radiation (SPR) for the little-investigated case of arbitrary angles between the charged particle trajectories and the rulings of a grating. The effect of conical diffraction arising here changes drastically the space distribution of the radiation. By contrast to the only existing approach, described by Haeberle et al. [Phys. Rev. E 55, 4675 (1997)], which requires difficult numerical calculations, we give a fully analytic theory of SPR. Also, in this paper we present for the first time the theory of x-ray Smith-Purcell radiation. Evanescent waves on the surface are shown to lead to strong enhancement of Smith-Purcell radiation, through a resonant mechanism. The results are important for the description of real divergent high-brightness beams and for the development of novel noninvasive diagnostic schemes based on the Smith-Purcell effect.
史密斯-珀塞尔辐射是一种众所周知的现象，它为带电粒子束的诊断提供了一种非侵入性方案，并被用作电磁波的有效来源，例如在欧罗加速器、自由电子激光器等中。在本文中，我们发展了Smith-Purcell辐射理论(SPR)，用于很少研究的带电粒子轨迹与光栅规则之间的任意角度的情况。这里产生的锥形衍射效应极大地改变了辐射的空间分布。与Haeberle等人所描述的唯一现有方法相比。Rev. E 55,4675(1997)]，这需要困难的数值计算，我们给出了一个完整的解析理论的SPR。本文还首次提出了x射线史密斯-珀塞尔辐射理论。表面上的倏逝波通过共振机制导致了史密斯-珀塞尔辐射的强烈增强。这些结果对于描述真实的高亮度发散光束和发展基于Smith-Purcell效应的新型无创诊断方案具有重要意义。
{"title":"Conical diffraction effect in optical and x-ray Smith-Purcell radiation","authors":"D. Sergeeva, A. Tishchenko, M. Strikhanov","doi":"10.1103/PHYSREVSTAB.18.052801","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.052801","url":null,"abstract":"Smith-Purcell radiation is a well-known phenomenon, which provides a noninvasive scheme for diagnostics of charged particle beams and is used as an effective source of electromagnetic waves, e.g., in the orotron, the free electron laser, etc. In this paper we develop the theory of Smith-Purcell radiation (SPR) for the little-investigated case of arbitrary angles between the charged particle trajectories and the rulings of a grating. The effect of conical diffraction arising here changes drastically the space distribution of the radiation. By contrast to the only existing approach, described by Haeberle et al. [Phys. Rev. E 55, 4675 (1997)], which requires difficult numerical calculations, we give a fully analytic theory of SPR. Also, in this paper we present for the first time the theory of x-ray Smith-Purcell radiation. Evanescent waves on the surface are shown to lead to strong enhancement of Smith-Purcell radiation, through a resonant mechanism. The results are important for the description of real divergent high-brightness beams and for the development of novel noninvasive diagnostic schemes based on the Smith-Purcell effect.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85490494","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 : 2015-05-08DOI: 10.1103/PHYSREVSTAB.18.050101
K. Takayama, T. Adachi, M. Wake, K. Okamura
{"title":"Racetrack-shape fixed field induction accelerator for giant cluster ions","authors":"K. Takayama, T. Adachi, M. Wake, K. Okamura","doi":"10.1103/PHYSREVSTAB.18.050101","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050101","url":null,"abstract":"","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88764520","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 : 2015-05-07DOI: 10.1103/PHYSREVSTAB.18.050701
J. Sekutowicz, V. Ayvazyan, M. Barlak, J. Branlard, W. Cichalewski, W. Grabowski, D. Kostin, J. Lorkiewicz, W. Merz, R. Nietubyć, R. Onken, A. Piotrowski, K. Przygoda, E. Schneidmiller, M. Yurkov
We discuss the progress in the R program for a future upgrade of the European XFEL facility, namely for an operation in the continuous wave (cw) and long pulse (lp) modes, which will allow for significantly more flexibility in the electron and photon beam time structure. Results of cw/lp runs with preseries XFEL cryomodules and status of components needed for the new operation modes are presented here.
{"title":"Research and development towards duty factor upgrade of the European X-Ray Free Electron Laser linac","authors":"J. Sekutowicz, V. Ayvazyan, M. Barlak, J. Branlard, W. Cichalewski, W. Grabowski, D. Kostin, J. Lorkiewicz, W. Merz, R. Nietubyć, R. Onken, A. Piotrowski, K. Przygoda, E. Schneidmiller, M. Yurkov","doi":"10.1103/PHYSREVSTAB.18.050701","DOIUrl":"https://doi.org/10.1103/PHYSREVSTAB.18.050701","url":null,"abstract":"We discuss the progress in the R program for a future upgrade of the European XFEL facility, namely for an operation in the continuous wave (cw) and long pulse (lp) modes, which will allow for significantly more flexibility in the electron and photon beam time structure. Results of cw/lp runs with preseries XFEL cryomodules and status of components needed for the new operation modes are presented here.","PeriodicalId":20072,"journal":{"name":"Physical Review Special Topics-accelerators and Beams","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78726632","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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