Keyword: ECR
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MOPP002 Current Per Bunch Distribution Measurement at ESRF SRF, data-analysis, experiment, injection 58
 
  • L. Torino, B. Roche, B. Vedder
    ESRF, Grenoble, France
 
  During the last run of the ESRF machine, several instrumentation improvements have been carried out in order to be exported on the new EBS storage ring. In particular, the top-up operation mode has been implemented and it demanded for an accurate, fast, and reliable measurement of the current per bunch distribution. In this proceeding, we describe the characteristics and the performance of the setup chosen to perform this measurement, which consists in a stripline, connected with a high dynamic range oscilloscope and a dedicated data analysis. We also comment on the integration of the measurement in the top-up routine to selectively refill less populated bunches.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP002  
About • paper received ※ 03 September 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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MOPP013 Faraday Cup Selector for DC-280 Cyclotron diagnostics, controls, cyclotron, LabView 102
 
  • V.V. Aleinikov, S. Pachtchenko
    JINR, Dubna, Moscow Region, Russia
  • K.P. Sychev, V. Zabanova
    JINR/FLNR, Moscow region, Russia
 
  New isochronous cyclotron DC-280, the basic facility of Super Heavy Element (SHE) factory was put into operation in the FLNR JINR on March 25, 2019. Key role in beam diagnostics for lossless transportation is played by Faraday cups. Five elements were installed along the two injection lines, and 12 elements on the five transport channels to the experimental facilities. The software was developed to automatically select the active Faraday cup depending on its location and track the current on a single indicator. This paper describes basic principles and algorithm of the Faraday cup Selector module which is a part of the DC-280 cyclotron control system.  
poster icon Poster MOPP013 [2.214 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-MOPP013  
About • paper received ※ 27 August 2019       paper accepted ※ 08 September 2019       issue date ※ 10 November 2019  
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TUPP005 PLC Based Flexible and Scalable Vacuum Control at the Argonne Tandem Linear Accelerator System (ATLAS) vacuum, controls, PLC, status 280
 
  • Y. Luo, D.G. Bilbrough, C. Dickerson, A.E. Germain, M.R. Hendricks, C.E. Peters, S.I. Sharamentov
    ANL, Lemont, Illinois, USA
 
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. This research used resources of ANL’s ATLAS facility, a DOE Office.
The beamline sections of an accelerator and different ion sources require a vacuum system capable of providing pressures down to 10-10 Torr. To control, monitor, and provide interlock protection of the vacuum equipment, a PLC-based vacuum control system was developed and tested at the Argonne Tandem Linear Accelerator (ATLAS). This system was designed to be highly flexible and scalable to meet the variety of equipment and configurations at ATLAS. The current FGPA-based system is reliable and fast, but is very difficult to maintain and upgrade. Particular attention was paid to the signal distribution to promote standard cable connections, minimize the usage of terminal blocks, and reduce the time to troubleshoot problematic channels. The system monitors the status of fast acting relays for interlock or control purposes, and utilizes RS-485 communication to gather lower priority information such as pump speeds or vacuum pressure readouts. The vacuum levels are monitored to interlock the high voltages of some beam instruments to protect against sparks as the Paschen minimum is approached. This paper mainly presents work on hardware interface to various vacuum devices.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP005  
About • paper received ※ 30 August 2019       paper accepted ※ 07 September 2019       issue date ※ 10 November 2019  
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TUPP007 Transverse Phase Space Scanner Developments at IPHC neutron, emittance, electron, radiation 288
 
  • F.R. Osswald, T. Adam, P.G. Graehling, M. Heine, C. Maazouzi, E.K. Traykov
    IPHC, Strasbourg Cedex 2, France
 
  Emittance characterization of charged particle beams is a standard and important tool to assess the performances of a facility. Due to emittance growth, beam losses and space charge the measurement of the transverse phase space distributions of the charged particles is still an up-to-date issue even at low energy and for wide beams. It enables detailled characterization of particle position and incidence in addition to other diagnostics. It gives access to the particles distribution at the boarder, a region of lower density important for high power accelerators and high intensity radioactive beams as they request reduced losses and damages thus less contaminated parts and nuclear waste for a safe handling during maintenance. Transverse Phase Space Scanners are designed at IPHC and based on the Allison system. They are currently used on different injection channels of large facilities as SPIRAL 2 and FAIR and will be used in the future on the DC280/SHE facility at JINR. A review of the IPHC’s high resolution scanner design, development programme and future challenges are presented espacially for beam halo analysis and "loss less" beam transport lines.  
poster icon Poster TUPP007 [1.475 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP007  
About • paper received ※ 03 September 2019       paper accepted ※ 09 September 2019       issue date ※ 10 November 2019  
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TUPP022 Development of the Calculation Method of Injection Beam Trajectory of RIKEN AVF Cyclotron with 4D Emittance Measured by the Developed Pepper-Pot Emittance Monitor cyclotron, emittance, space-charge, injection 346
 
  • Y. Kotaka, N. Imai, Y. Ohshiro, Y. Sakemi, S. Shimoura, H. Yamaguchi
    CNS, Saitama, Japan
  • A. Goto, M. Kase, T. Nagatomo, T. Nakagawa, J. Ohnishi
    RIKEN Nishina Center, Wako, Japan
  • K. Hatanaka
    RCNP, Osaka, Japan
  • H. Muto
    Suwa University of Science, Chino, Nagano, Japan
 
  The Center for Nuclear Study, the University of Tokyo and RIKEN Nishina Center have been developing the AVF Cyclotron system at RIKEN. One of the important developments is to improve the transport system of the injection beam line. The transport efficiencies tend to decrease as beam intensities increase. To solve this problem, we developed the calculation method to trace a beam trajectory with a four-dimensional (4D) beam emittance measured by pepper-pot emittance monitor (PEM) as initial value. The reason for using the 4D beam emittance is that the transport system has rotating quadrupole magnets and solenoid coils, and that the space charge effect can be introduced. The beams through a pepper-pot mask can be detected on the potassium bromide fluorescent plate inclined 45 degree to the beam to be recorded by digital camera using developed PEM. We compared the calculated beam trajectory with the measurement of other beam diagnostics and quantified the degree of fit. It has been found that the degree of fit is improved by changing fiducial points on the fluorescent plate and optimizing the thickness of the fluorescent agent and the exposure time and gain of the digital camera.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-TUPP022  
About • paper received ※ 04 September 2019       paper accepted ※ 10 September 2019       issue date ※ 10 November 2019  
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WEPP036 Application of Thermoelectric Oscillations in a Lithium Niobate Single Crystal for Particle Generation electron, experiment, vacuum, radiation 614
 
  • K.V. Fedorov, P. Karataev
    JAI, Egham, Surrey, United Kingdom
  • K.V. Fedorov
    TPU, Tomsk, Russia
  • O.O. Ivashchuk, A.A. Klenin, A.S. Kubankin, A.N. Oleinik
    BelSU, Belgorod, Russia
  • A.V. Shchagin
    NSC/KIPT, Kharkov, Ukraine
 
  Single crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) can be used to accelerate electrons and positive ions to energies of the order of 100 keV and generate X-rays and fast neutrons, as well as to control beams of charged particles. However, this way of particles acceleration and generation is not widely used yet due to an unstable particle flux caused by electric breakdowns or crystal impurities leading to temporal discontinuity of pyroelectric current. A sinusoidal mode of the temperature change demonstrated stable oscillations of the pyroelectric current on the polar surface with typical frequency being of the order of 1-50 mHz and the amplitude being about 1-10 nA for samples with area of several cm2. In vacuum it leads to generation of high electric field, which oscillates with the same frequency. Estimated amplitude of electric field is order of 105 V/cm. The possibilities of using such mode of temperature change to obtain a quasi-stable X-ray and electron source are considered. The fundamental properties and further prospects for the application of thermoelectric oscillations are also discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2019-WEPP036  
About • paper received ※ 03 September 2019       paper accepted ※ 11 September 2019       issue date ※ 10 November 2019  
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