Keyword: impedance
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MOPA01 Status Overview of the HESR Beam Instrumentation pick-up, proton, antiproton, instrumentation 26
  • C. Böhme, A.J. Halama, V. Kamerdzhiev, F. Klehr, B. Klimczok, M. Maubach, S. Merzliakov, D. Prasuhn, R. Tölle
    FZJ, Jülich, Germany
  The High Energy Storage Ring (HESR), within the Facility for Antiproton and Ion Research (FAIR), will provide proton and anti-proton beams for PANDA (Proton Antiproton Annihilation at Darmstadt) and heavy ion beams for SPARC (Stored Particles Atomic Physics Research Collaboration). With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM being in production, other BI instruments like Viewer, Scraper, or Ionization Beam Profile Monitor are in the mechanical design phase. An overview of the status is presented.  
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MOPB08 Evaluation of the Transverse Impedanse of Pf in-Vacuum Undulator Using Local Orbit Bump Method factory, undulator, betatron, simulation 89
  • O. Tanaka, M. Adachi, K. Harada, R. Kato, N. Nakamura, T. Obina, R. Takai, Y. Tanimoto, K. Tsuchiya, N. Yamamoto
    KEK, Ibaraki, Japan
  When a beam passes through insertion devices (IDs) with narrow gap or beam ducts with small aperture, it receives a transverse kick from the impedances of those devices. This transverse kick depends on the beam trans-verse position and beam parameters such as the bunch length and the total bunch charge. In the orbit bump method, the transverse kick factor of an ID is estimated through the closed orbit distortion (COD) measurement at many BPMs for various beam currents [1]. In the present study, we created an orbit bump of 1 mm using four steering magnets, and then measured the COD for two cases: when the gap is opened (the gap size is 42 mm) and when the gap is closed (the gap size is 3.83 mm). The ID's kick factors obtain by these measurements are compared with those obtain by simulations and analytical evaluations.  
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MOPB17 Using a TE011 Cavity as a Magnetic Momentum Monitor cavity, electron, GUI, coupling 111
  • J. Guo, J. Henry, M. Poelker, R.A. Rimmer, R. Suleiman, H. Wang
    JLab, Newport News, Virginia, USA
  Funding: Authored by Jefferson Science Associates, LLC with Laboratory Directed Research and Development funding, under U.S. DOE Contract No. DE-AC05-06OR23177.
The Jefferson Lab Electron-Ion Collider (JLEIC) design relies on cooling of the ion beam with bunched electron beam constrained in a pair of long solenoids. The high current cooling electron beam needs to be generated in a magnetized electron source, and the beam's magnetization needs to be maintained during the acceleration and transport to the cooling channel. A non-invasive real time monitoring system is highly desired to quantify electron beam magnetization. The authors propose to use a passive copper RF cavity in TE011 mode as such a monitor. In this paper, we present the mechanism and scaling law of this device, as well as the design and preliminary test results of the prototype cavity.
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TUPB04 Development of a New Button Beam-position Monitor for BESSY VSR vacuum, resonance, storage-ring, operation 265
  • J.G. Hwang, V. Dürr, M. Ries, A. Schälicke, G. Schiwietz, D. Wolk
    HZB, Berlin, Germany
  An extreme operation mode such as the BESSY-VSR conditions stimulates the development of a high accuracy bunch-by-bunch beam-position monitor (BPM) system which is compatible with the bunch-selective operation for the orbit feedback system. Such a system will also greatly benefit to accelerator R&D such as transverse resonance island buckets (TRIBs). Compensation of the long-range ringing signal produced by the combined effect of impedance mismatching inside the button and trapped TE-modes in the aluminum-oxide insulator (Al2O3) material is required essentially to improve the resolution. This is important since the ringing causes a misreading of the beam position and current of following bunches. We show the design study of a new button-type BPM to mitigate the influence of the ringing signal as well as to reduce wake losses by improving the impedance matching in the button and by replacing the insulator material.  
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TUPB10 Design and Simulation of Stripline BPM for HUST Proton Therapy Facility coupling, proton, dipole, electron 281
  • J.Q. Li, Q.S. Chen, K. Fan, K. Tang, P. Tian
    HUST, Wuhan, People's Republic of China
  Proton beams used in Huazhong University of Science and Technology Proton Therapy Facility(HUST-PTF)have extreme low currents of the order of nanoampere,which is a great challenge to beam diagnostics due to low signal level. Conventional destructive beam diagnostic devices will affect the quality of the beam and cannot work online during the patient treatment, so a non-destructive stripline beam position monitor (BPM) is designed. This study will introduce some analysis and simulation results of the stripline BPM, such as the coupling between the electrodes, impedance matching, signal response, etc. We also discussed how to increase the output signal by geometry optimization.  
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TUPC11 Design of an Ultrafast Stripline Kicker for Bunch-by-Bunch Feedback kicker, FEL, HOM, electron 322
  • J. Wang, P. Li, D. Wu, D.X. Xiao, L.G. Yan
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  Funding: Work supported by China National Key Scientific Instrument and Equipment Development Project (2011YQ130018), National Natural Science Foundation of China (11475159, 11505173, 11575264 and 11605190)
The CAEP THz Free Electron Laser (CTFEL) will have a fast transverse bunch-by-bunch feedback system on its test beamline, which is used to correct the beam position differences of individual bunches with interval of about 2 ns. In this paper, we are proposing an ultrafast wideband stripline kicker, which is able to provide a kick to the bunch in a 2 ns time window. The structure design and simulation results of this kicker are also discussed.
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