Author: Chung, M.
Paper Title Page
TUPP028 Double-Wire Vibrating Wire Monitor (DW-VWM) for Beam Halo Monitoring in High-intensity Accelerators 368
 
  • D.H. Kwak, M. Chung
    UNIST, Ulsan, Republic of Korea
  • S.G. Arutunian, A.V. Margaryan
    ANSL, Yerevan, Armenia
  • G.S. Harutyunyan, E.G. Lazareva
    YSU, Yerevan, Armenia
 
  Funding: This work was partly supported by the National Research Foundation of Korea (Grants No. 2017M1A7A1A02016413).
Double-Wire Vibrating Wire Monitor (DW-VWM) has been designed and manufactured to monitor the beam halo in high-intensity accelerators. Compared with the previous VWM, we increase the ratio between the aperture and wire length by using strong 5 mm x 5 mm Samarium-Cobalt magnets. In addition, we install two stainless steel vibrating wires on the same frame. The first wire is placed in the beam halo region for measurements, and the second wire, which is separated from the beam by a screen, is used to subtract background signal caused by ambient temperature shifts. The new electronics of the DW-VWM consist of two main boards: auto-generation unit which is placed near the VWM, and the frequency measurement unit which is placed in the control room (100 m distance operation was tested). Typical frequency of the VWM (at start tension about 0.7 of tensile strength) is about 8000 Hz. The temperature sensitivity is about 110 Hz/K with 0.2 mK Hz resolution. The VWM was tested in vacuum tank and the frequency corresponding to each vacuum level was analyzed. The process of oscillation excitation at different levels of vacuum was also investigated.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP028  
About • paper received ※ 04 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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TUPP029 Stripline-based Non-destructive Beam Profile Monitoring System for Muon g-2/EDM Experiment at J-PARC 372
 
  • C.K. Sung, M. Chung
    UNIST, Ulsan, Republic of Korea
  • S. Hacıömeroğlu
    IBS, Daejeon, Republic of Korea
  • Y.K. Semertzidis
    CAPP/IBS, Daejeon, Republic of Korea
  • Y.K. Semertzidis
    KAIST, Daejeon, Republic of Korea
 
  The muon g-2/EDM experiment at J-PARC aims to measure the muon magnetic moment anomaly, a and electric dipole moment, d by introducing an approach excluding any electric field with measurement goal of 450 and 70 ppb for statistical and systematic uncertainty of a , respectively, and sensitivity of 1.5·10-21 e’cm for d. In order to achieve the precision, the beam needs to manipulated such that the X and Y components are coupled by means of skew quadrupole magnets through the transmission line. The XY coupling quality can affect the transmission and storage efficiency so that its failure causes systematic error. Since it is significant to monitor the XY coupling status during the beam operation, a non-destructive beam profile monitoring system is under development to investigate the XY coupling quality so as to reduce the source of systematic uncertainties. The device consists of stripline electrodes installed with 45 deg. rotational symmetry. It will reconstruct the coupling parameters such as skew angle and beam size by using the FFT-based algorithm. This work presents the simulation result on the reconstruction and the wire test result for the prototype device.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP029  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)