Keyword: experiment
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TUVIR06 Review of Required Proof-Of-Principle-Experiments Towards a Muon Collider collider, positron, target, emittance 16
 
  • A. Variola
    INFN/LNF, Frascati, Italy
 
  The HEP scientific community is, at present, exploring different scenario concerning the post LHC era. In fact, after the Higgs boson discovery, the future facility will require not only to improve the LHC and HL-LHC physics programs but also to continue the search for phenomena beyond the Standard Model into an extended energy domain. In this framework ideas and proposals, together with the results obtained in accelerator research, introduce a scenario where the feasibility of a multi-TeV muon collider should be explored. This article will describe the advantages provided by the muon collider scheme. The proposed schemes will be shortly illustrated. The very important recent results obtained in proof-of-principle experiments will be subsequently described. Finally, for each scheme, the future possible directions for proof-of-principle experiments to demonstrate the muon collider feasibility will be presented.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-TUVIR06  
About • paper received ※ 31 May 2020       paper accepted ※ 12 June 2020       issue date ※ 23 October 2020  
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TUVIR15 Long-Term Beam Position and Angle Stabilities for the J-Parc Main Ring Slow Extraction extraction, proton, septum, operation 31
 
  • M. Tomizawa, Y. Arakaki, T. Kimura, Y. Komatsu, S. Murasugi, R. Muto, K. Okamura, Y. Shirakabe, E. Yanaoka
    KEK, Ibaraki, Japan
 
  A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. One of the critical issues in slow extraction of a high intensity proton beam is an inevitable beam loss caused by the extraction process at septum devices. A unique dynamic bump scheme for the slow extraction has been applied to reduce the beam loss. We have achieved 51 kW stable operation at 5.2s cycle in the recent physics run. The extraction efficiency is very high, typically 99.5%. However, the dynamic bump scheme is sensitive to the beam orbit angle at the first electrostatic septum (ESS1). The orbit angle of the dynamic bump must be sometimes readjusted to keep such a high efficiency. In future, diffusers and/or a silicon bend crystal, which are more sensitive to the orbit angle fluctuation, would be introduced to achieve a further high slow extraction efficiency. A long-term stability of the beam position and angle at the ESS1 has been investigated. We observed the fluctuations synchronized with tides and estimated to be due to tunnel expansion.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-TUVIR15  
About • paper received ※ 09 June 2020       paper accepted ※ 11 June 2020       issue date ※ 30 July 2020  
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WEVIR11 Safety System for the Respect of Nuclear Requirements of SPIRAL2 Facility controls, operation, linac, ISOL 57
 
  • P. Anger, V.C. Cingal, JC-P. Pacary, S.P.G. Perret-Gatel, A. Savalle
    GANIL, Caen, France
 
  The SPIRAL2 Facility at GANIL is based on the construction of a superconducting ion CW LINAC (up to 5 mA - 40 MeV deuteron beams and up to 1 mA - 14.5 MeV/u heavy ion beams) with 2 experimental areas called S3 and NFS. For safety classified systems, SPIRAL2 project system engineering sets up a specific reinforced process, based on V-Model, to validate, at each step, all the requirements (technical, nuclear safety, quality, reliability, interfaces…) from the functional specifications to the final validation. Since 2016, safety devices have been under construction and in test phase. These tests which are pre-requisites to deliver the first beam demonstrated that both functional and safety requirements are fulfilled. Currently, all of them are in operation for the LINAC and NFS commissioning phases. This contribution will describe the requirements, the methodology, the quality processes, the technical studies, the failure mode and effects analysis, the tests, the status and will propose you a feedback.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR11  
About • paper received ※ 01 June 2020       paper accepted ※ 14 June 2020       issue date ※ 15 June 2020  
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WEVIR16 A Novel Nondestructive Diagnostic Method for MeV Ultrafast Electron Diffraction electron, detector, diagnostics, real-time 67
 
  • X. Yang, M.G. Fedurin, J.J. Li, T.V. Shaftan, V.V. Smaluk, L. Wu, L. Yu, Y. Zhu
    BNL, Upton, New York, USA
  • W. Wan
    ShanghaiTech University, Shanghai, People’s Republic of China
 
  Funding: BNL LDRD
A real-time, nondestructive, Bragg-diffracted electron beam energy, energy-spread and spatial-pointing jitter monitor is experimentally verified by encoding the electron beam energy and spatial-pointing jitter information into the mega-electron-volt ultrafast electron diffraction pattern. The shot-to-shot fluctuation of the diffraction pattern is then decomposed to two basic modes, i.e., the distance between the Bragg peaks as well as its variation (radial mode) and the overall lateral shift of the whole pattern (drift mode). Since these two modes are completely decoupled, the Bragg-diffraction method can simultaneously measure the shot-to-shot energy fluctuation from the radial mode with 2,10-4 precision and spatial-pointing jitter from the drift mode having wide measurement span covering energy jitter range from 10-4 to 10-1. The key advantage of this method is that it allows us to extract the electron beam energy spread concurrently with the ongoing experiment and enables online optimization of the electron beam especially for future high charge single-shot ultrafast electron diffraction (UED) and ultrafast electron microscopy (UEM) experiments.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-WEVIR16  
About • paper received ※ 08 June 2020       paper accepted ※ 14 June 2020       issue date ※ 07 September 2020  
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