Beam Diagnostics in the Advanced Plasma Wakefield Experiment AWAKE
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A.-M. Bachmann, P. Muggli
MPI, Muenchen, Germany
In AWAKE a self-modulated proton bunch drives wakefields in a plasma. Recent experiments successfully demonstrated many aspects of the self-modulation of the drive bunch as well as acceleration of test electrons [*,**,***]. Next experiments will focus on producing a multi-GeV accelerated electron bunch with low emittance and low energy spread. The experiment requires a variety of advanced beam diagnostics to characterize the self-modulated proton bunch at the picosecond time scale. These include optical transition radiation and a streak camera for short and long time scale detailed imaging of self-modulation and hosing, coherent transition radiation for modulation frequency measurements in the 100-300 GHz frequency range and multiple fluorescent screens for core and halo measurements. An overview of these diagnostics will be given. *E. Adli et al., Phys. Rev. Lett., Vol. 122, 054802 (2019). **M. Turner et al., Phys. Rev. Lett., Vol. 122, 054801 (2019). ***E. Adli et al., Nature 561, 363-367 (2018).
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Initial Experiences With Beam Diagnostics During Sirius Commissioning
H.O.C. Duarte, S.R. Marques, D.O. Tavares
LNLS, Campinas, Brazil
This work will describe the first results for Sirius beam diagnostics, alongside with the interrelated experiences, studies, problems and their solutions during the first months of the machine commissioning.
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Commissioning of the Beam Instrumentation System of CSNS
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J.L. Sun, W.L. Huang, F. Li, P. Li, R.Y. Qiu, Zh.H. Xu, T. Yang
IHEP CSNS, Guangdong Province, People’s Republic of China
M. Meng, J.M. Tian, T.G. Xu, L. Zeng
IHEP, Beijing, People’s Republic of China
China Spallation Neutron Source (CSNS) accelerator complex consists of a front end, an 80 MeV DTL LINAC, and a 1.6 GeV Rapid Cycling Synchrotron (RCS). It is designed with a beam power of 100 kW in the first phase and reserves upgrade capability to 500 kW in the second phase. CSNS has started user operation at 20 kW after the initial beam commissioning in 2018, the beam power is quickly up to 50 kW and 80 kW by two times beam commissioning in between the user beam time 2019, and finally reached 100kW, the design goal, in February 2020. This talk gives the experiences and most recent status of beam instrumentation system of CSNS during the beam power ramping, as well as future upgrade plan for CSNS-II.
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Beam Instrumentation Performances through the ESRF-EBS Commissioning
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L. Torino
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
N. Benoist, F. Ewald, E. Plouviez, J.L. Pons, B. Roche, K.B. Scheidt, F. Taoutaou, F. Uberto
ESRF, Grenoble, France
The upgrade of the European Synchrotron Radiation Facility (ESRF) storage ring has lead to the construction of a new machine called the Extremely Brilliant Source (EBS). EBS has been successfully commissioned in less than three month and reached the targeted parameters for user mode. The success of the EBS commissioning also depended on the performances and the reliability of the beam instrumentation used to monitor the beam. In this paper a summary of the EBS commissioning is presented with a special focus on the beam instrumentation performances.
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Beam Instrumentation System for Shanghai Soft X-ray FEL Test Facility
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L.W. Lai, F.Z. Chen, J. Chen, J. Chen, W. Fang, C. Feng, B. Gao, R. Jiang, Y.B. Leng, Y.B. Yan, L.Y. Yu, R.X. Yuan, N. Zhang, W.M. Zhou, T. Shen
SSRF, Shanghai, People’s Republic of China
S.S. Cao, L.F. Hua
SINAP, Shanghai, People’s Republic of China
Shanghai Soft X-ray FEL (SXFEL) test facility was designed and built to demonstrate EEHG and HGHG schemes and verify key technologies for the future hard X-ray FEL facility (SHINE). After three years commissioning 8.8 nm FEL radiation with peak power of 1 MW had been achieved at the end of 2019. The design, fabrication, commissioning and operation of BI system including Stripline-BPM, Cavity-BPM, screen monitor, bunch length monitor, beam arrival monitor, bunch energy monitor, will be introduced in this paper. Several lessons learned during design stage and beam commissioning stage will be addressed as well.
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Design of the Beam Diagnostic System for the New 3 GeV Light Source in Japan
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H. Maesaka, T. Fukui
RIKEN SPring-8 Center, Innovative Light Sources Division, Hyogo, Japan
H. Dewa, T. Fujita, M. Masaki
JASRI/SPring-8, Hyogo-ken, Japan
S. Takano
Japan Synchrotron Radiation Research Institute (JASRI), RIKEN SPring-8 Center, Hyogo, Japan
K. Ueshima
National Institutes for Quantum and Radiological Science and Technology (QST), Sayo-cho, Japan
We present a design overview of the beam diagnostic system for the new 3 GeV light source being constructed in Tohoku, Japan, and some test results obtained at SPring-8. This light source will generate brilliant x-rays from a high-quality electron beam having 1 nm rad emittance and 400 mA maximum stored current. To achieve the design performance and stability, we must monitor various beam parameters precisely. The beam position should be detected precisely: single-pass resolution < 0.1 mm (0.1 nC injected beam), COD resolution < 0.1 μm (more than 100 mA stored current), position stability < 5 μm for 1 month. We will use 112 button-type BPMs in the storage ring for these purposes. The stored beam current and beam size are also monitored with a DCCT and an x-ray pinhole camera. We will install a 3-pole wiggler to a straight section for the pinhole camera and other optical diagnostics. A stripline BPM and a stripline kicker will be installed to another straight section to suppress the beam instability and to measure betatron tune. We will use FPGA-based high-speed electronics for instability suppression with a bunch-by-bunch feedback method and real-time tune monitoring.
Consideration and Design of HEPS Beam Instrumentation
J.H. Yue, J.S. Cao, Y.Y. Du, J. He, F. Liu, Z. Liu, Y.H. Lu, H.Z. Ma, Y.F. Sui, L. Wang, S.J. Wei, T.G. Xu, J. Yang, Q. Ye, D. Yin, L. Yu, X.E. Zhang, J.X. Zhao, X.Y. Zhao, Y. Zhao, D.C. Zhu
IHEP, Beijing, People’s Republic of China
High Energy Synchrotron Photon Source（HEPS）is an ultra-low emittance light source, of which the energy is 6 GeV, the current is 100-200mA, so it is more difficult to the physics design and hardware design. To the beam instrumentation, sub-micron level beam position measurement and controlling system, sub-micron synchrotron measurement system based x-ray and bunch by bunch feedback system are the technologies which we need to master and to develop. Beam position measurement system is based on digital technology; it is difficult to design and home-made. Emittance measurement of storage is relied on the accuracy measurement of beam profile, of which the resolution is sub-micron level; x ray KB mirror imaging system can meet such high resolution requirement and a good choice. bunch by bunch feedback systems are used to restrin the beam instabilities. In this article, the author introduces the beam instrumentations in detail.
