Beam Charge Monitors and Other Instruments
Paper Title Page
MOPB013 Cryogenic Current Comparator for Storage Rings and Accelerators 1
  • R. Geithner, T. Stöhlker
    IOQ, Jena, Germany
  • M.F. Fernandes
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • M.F. Fernandes
    CERN, Geneva, Switzerland
  • M.F. Fernandes
    The University of Liverpool, Liverpool, United Kingdom
  • R. Geithner, T. Stöhlker
    HIJ, Jena, Germany
  • F. Kurian, H. Reeg, M. Schwickert, T. Sieber, T. Stöhlker
    GSI, Darmstadt, Germany
  • R. Neubert, P. Seidel
    FSU Jena, Jena, Germany
  A Cryogenic Current Comparator (CCC) was developed for a non-destructive, highly sensitive monitoring of nA beams at the planned FAIR accelerator facility at GSI. The sensor part of the CCC was optimized for lowest possible noise-limited current resolution in combination with a high system bandwidth of about 200 kHz. It is foreseen to install the CCC inside the CRYRING, which will act as a well-suited test bench for further optimization of the CCC performance and the cryostat. In the meantime - until the completion of CRYRING - a CCC has been installed and will be tested in the antiproton storage ring (Antiproton Decelerator AD) at CERN. The pulse shape in the AD requires dedicated optimization of the sensor time response. The beam current will increase rapidly during injection from 0 to 12 μA. Since the slew rate of the overall system is limited by the CCC pickup coil, the input signal has to be low-pass filtered to not exceed the slew rate of the CCC system and to ensure a stable operation. For this purpose different low-pass configurations had been tested. In this contribution we present results of the CCC ¬sensor for AD, CRYRING and FAIR, respectively.  
poster icon Poster MOPB013 [4.700 MB]  
MOPB015 A Patient-Specific QA Procedure for Moving Target Irradiation in Scanned Ion Therapy 1
  • Y. Hara, T. Furukawa, K. Mizushima, K. Noda, N. S. Saotome, Y. Saraya, T. Shirai, R. Tansho
    NIRS, Chiba-shi, Japan
  Three-dimensional (3D) pencil-beam scanning technique has been utilised since 2011 in NIRS-HIMAC. The beam delivery system and treatment planning software (TPS) require dosimetric patient-specific QA to check each individual plan. Any change in the scanned beams will result in a significant impact on the irradiation dose. Therefore, patient-specific QA for moving target irradiation requires additional procedure. In an additional QA for moving target irradiation, we placed a 2D ionization chamber on the PMMA plate tilted with respect to the beam axis. The PMMA plate was set on the stage of the moving phantom. The moving phantom was moved according to patient data. We measured the dose distribution for both the static target and the moving target. We compared the results for the moving target with those for the static targets by means of a gamma index analysis. In the additional patient-specific QA, the gamma analysis between the moving and static targets showed a good agreement. We confirmed that this new technique was a beneficial QA procedure for moving target irradiation.  
poster icon Poster MOPB015 [1.571 MB]  
MOPB023 A Comparative Study Between Simulated and Measured Beam's Quality of 30 MeV Cyclotron at KFSHRC 1
  • F.M. Alrumayan, A. Alghaith, A. Hendy
    King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Kingdom of Saudi Arabia
  • M.P. Dehnel
    D-Pace, Nelson, British Columbia, Canada
  Funding: This project was supported by NSTIP strategic technologies program in the Kingdome of Saudi Arabia-Award No (14-MAT1233-20).
At King Faisal Specialist Hospital and Research Centre (KFSHRC), the C-30 Cyclotron (manufactured by IBA) is used to produce radioisotopes for medical purposes. Working with very expensive machine dedicated for patients needs full attention and understanding of how beam can be controlled safely inside beam transport system. Moreover, knowledge of influence of magnetic lenses on charged particles is desired. Therefore, using off-line source such as PC-based beam simulator allows an operator to immediately see the effect of various magnetic lenses attached to the beam line. This would eliminate any damage may take place from striking of beam on the internal wall of beamline. For real beam measurement, beam position and profile was studied using a beam viewer. Whereas, simulated beam was generated using Beam Simulator program. Initially, the magnetic field of quadruples and steering magnet was recorded using Hall probe Teslameter. The magnetic field values were measured and then uploaded into the Beam simulator in which beam shape and position were recorded.
MOPB025 Heating Analysis and the Solutions of Dcct System for Bepcii 1
  • Y. Zhao, J.S. Cao, J. He, Y.F. Sui, L. Wang
    IHEP, Beijing, People's Republic of China
  The BEPCII e+ DCCT is damaged due to a high temperature heating. After 8 years operating, it is not working properly in 2014. As the BEPCII is trying to reach high luminosity, the CT will be a defective component with the high beam current, therefore a spare one has replaced it. In order to determine the heating source, some experiments and simulations have been done. A new vacuum chamber structure has been designed to solve the problem. The analysis and result can be also applied to CT designs in the future.  
MOPB031 Electron Beam Uniformity Detection Device for Irradiation Accelerators 1
  • L.G. Zhang, J. Huang, K.F. Liu, J. Yang, C. Zuo
    HUST, Wuhan, People's Republic of China
  High-voltage electron accelerators are widely used in the irradiation processing industry. Beam uniformity of the accelerator has a very important impact on the quality of irradiated products. Accurate measurement of beam uniformity helps to improve product quality and production efficiency. In this paper, the electron beam uniformity detection device is designed based on a Faraday cup array followed by the signal shaping circuit and the digital signal processing system. Finally, the computer offers a friendly interface to help users understand the operating state of the accelerator and the electron beam uniformity information. This device uses DSP technology to process the signal and optical fibre to communicate which greatly improves the noise immunity capability of the system. Through such a high precision and easy to use detection device, a user can get the accelerator beam irradiation uniformity information which is very useful for guiding the industry radiation process.  
poster icon Poster MOPB031 [0.971 MB]  
MOPB032 Design and Analysis of a Beam Uniformity Detector Based on Faraday Cup Array 1
  • C. Zuo, J. Huang, J. Yang, L.G. Zhang
    HUST, Wuhan, People's Republic of China
  Beam uniformity of electron irradiation accelerator has a great impact results for industrial radiation process. In this paper, a beam uniformity detector, based on Faraday cup array, has been designed for a 400 kV electron irradiation accelerator in Huazhong University of Science and Technology. Suitable structure has been calculated for the secondary electrons emission. Cooling system is necessary for the detector in the condition of high-intensity ion beams, and it has been designed by thermo-structural analysis. This detector now has been used for experiments successfully.  
poster icon Poster MOPB032 [11.080 MB]  
MOPB036 PAL-XFEL's Turbo-ICT for Beam Charge Monitoring 1
  • H. J. Choi, J.H. Han, J.H. Hong, H.-S. Kang, S.H. Kim, B.R. Park, S.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  The construction of PAL-XFEL building, which is a fourth-generation synchrotron radiation-light source, was completed in February 2015. Concentration accelerating devices (Accelerator tube, Klystron, Modulator) and undulators will be installed by December of 2015 and commissioning concentration devices will be completed by the start of 2016. A Beamline user service will be started from the middle of 2016. The installation of PAL-ITF (Injector Test Facility) was completed at the end of 2012 for the production of high-quality electron bunch, and efforts were made to improve the performance of the pre-injector system and diagnostic equipment. In this study, details of the performance improvements at PAL-ITF measured by a Bergoz Turbo-ICT, which is able to measure the amount of electric charge from 0.1 to 200pC, and the operating plan for the Turbo-ICT which will be installed and operated in PAL-XFEL are introduced.  
MOPB040 Instrumentation in DESIREE 1
  • A. Källberg, M. Björkhage, M. Blom, H. Cederquist, G. Eklund, L. Liljeby, A. Paal, P. Reinhed, S. Rosén, H.T. Schmidt, S.B. Silverstein, A. Simonsson
    Stockholm University, Stockholm, Sweden
  • H. Danared
    ESS, Lund, Sweden
  • R.D. Thomas
    Stockholm University, Department of Physics, Stockholm, Sweden
  The use of the instrumentation in the cryogenic double electrostatic storage rings DESIREE is discussed. In particular measurements of the stored beam currents using either a fast kick-out of the beam or Schottky noise signals are presented. For the Schottky signals, both the area of the peak and the double-peak structure of the signal have been used. Also the first tests of a stochastic cooling system are described.  
poster icon Poster MOPB040 [1.382 MB]  
MOPB043 A Cryogenic Current Comparator for the Low-Energy Antiproton Facilities at CERN 1
  • M.F. Fernandes, J. Tan
    CERN, Geneva, Switzerland
  • M.F. Fernandes, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • M.F. Fernandes, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • R. Geithner, T. Stöhlker
    IOQ, Jena, Germany
  • R. Geithner, T. Stöhlker
    HIJ, Jena, Germany
  • R. Neubert
    FSU Jena, Jena, Germany
  • M. Schwickert, T. Stöhlker
    GSI, Darmstadt, Germany
  Funding: Funded by the European Unions Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485.
Several laboratories have shown the potential of Cryogenic Current Comparators (CCC) for an absolute measurement of beam intensity down to the nA level. This type of current monitor relies on the use of Superconducting QUantum Interference Device (SQUID) magnetometers and superconductor magnetic shields. CERN, in collaboration with GSI Helmholtz Centre for Heavy Ion Research, Jena University, and the Helmholtz Institute Jena are currently developing an improved version of such a current monitor for the Antiproton Decelerator (AD) and Extra Low ENergy Antiproton (ELENA) rings. The primary goals are a better current measurement accuracy and overall enhanced system availability. This contribution presents the design of the CCC, an estimation of its resolution, dynamic limitations of the SQUID, as well as a description of the modifications to the coupling circuit and cryostat that were required to optimize the monitor for the anticipated beam parameters. First results from beam measurements are also presented. To our knowledge these are the first CCC beam current measurements performed in a synchrotron and the first to be performed with both coasting and bunched beams.
MOPB064 Initial Work on the Design of a Longitudinal Bunch-by-Bunch Feedback Kicker at Diamond 1
  • A.F.D. Morgan, G. Rehm
    DLS, Oxfordshire, United Kingdom
  In 2017 it is planned to install some additional normal conducting cavities into the Diamond storage ring. There is some concern that higher order modes in these devices could cause longitudinal instabilities in the beam. In order to deal with this potential problem we have started work on designing a longitudinal bunch-by-bunch feedback system. This paper will concentrate on the design and simulation of the kicker cavity, which is of the overloaded cavity type.  
poster icon Poster MOPB064 [0.340 MB]  
MOPB065 Considerations and Improved Workflow for Simulation of Dissipated Power from Wake Losses 1
  • A.F.D. Morgan, G. Rehm
    DLS, Oxfordshire, United Kingdom
  At Diamond quite some effort has gone into simulating and understanding the dissipation of energy into structures induced by wake losses. Due to changes in the core simulation code we use, it is now possible to extract the dissipated energy information directly from the simulation rather than inferring it from other parts of the simulation output which was, by necessity, our previous method. Various modeled geometries will be used to illustrate the improved approach. Also, we will discuss the considerations needed when constructing the model geometries in order to get the most representative results from the simulation.  
poster icon Poster MOPB065 [0.337 MB]  
Instrumentation Options for the Australian Synchrotron SLED cavity upgrade  
  • P.A. Corlett
    ASCo, Clayton, Victoria, Australia
  • G. LeBlanc, K. Zingre
    SLSA, Clayton, Australia
  The Australian Synchrotron Light Source has been operating successfully since 2007 and in top-up mode since 2012 with excellent beam availability exceeding 99%. Considering the ageing of the equipment, effort is required in order to maintain the reliability at this level. The proposed upgrade of the linac with a SLED cavity system will require new RF diagnostic systems to be developed. This major upgrade will bring an opportunity to invest in new FPGA based digital hardware which will benefit both RF and beam diagnostics.  
Commissioning of the New Online-Radiation-Monitoring-System at the New European XFEL Injector with First Tests of the High-Sensitivity-Mode for Intra-Tunnel Rack Surveillance  
  • F. Schmidt-Föhre, L. Fröhlich, D. Nölle, R. Susen, K. Wittenburg
    DESY, Hamburg, Germany
  The new Embedded Online-Radiation-Monitoring-System, developed for the 17.5 GeV superconducting European XFEL (E-XFEL) that is currently being built between the DESY campus at Hamburg and Schenefeld at Schleswig-Holstein [1,2], has been commissioned in a first system test setup at the E-XFEL Injector. As most of the electronic systems for machine control, diagnostics and safety of the E-XFEL will be located in cabinets inside the accelerator tunnel, the test setup incorporates all system parts like cabinet-internal and -external monitor electronics, infrastructure interface boards, firmware, software, cabling and sensors. Hence the commissioning system setup gives the possibility for first operation of the complete online radiation monitoring system under realistic environmental conditions in terms of irradiation, electromagnetic interference (EMI) inside the injector tunnel, as well as operational and control system aspects. Commissioning results and measurements based on different internal and external sensor channels will be presented here, together with recent measurements done at different radiation sources using the high-sensibility mode for intra-rack radiation monitoring.  
slides icon Slides WECLA02 [6.166 MB]  
WECLA03 HTc-SQUID Beam Current Monitor at the RIBF 1
  • T. Watanabe, N. Fukunishi, M. Kase
    RIKEN Nishina Center, Wako, Japan
  • S.I. Inamori, K. Kon
    TEP Corporation, Tokyo, Japan
  Funding: JSPS KAKENHI (Grants-in-Aid for Scientific Research) Grant Number 23600015, 15K04749
A high critical temperature (HTc) superconducting quantum interference device (SQUID) beam current monitor (SQUID monitor) has been built and installed in the beam transport line in the radioactive isotope beam factory (RIBF) at RIKEN in Japan. The SQUID monitor can measure the DC current of heavy-ion beams non-destructively at high resolution. Unlike at other existing facilities, as a low vibration, pulse-tube refrigerator cools the HTc fabrications including the SQUID, the size of the system is reduced and the running costs are lowered. Recently, the magnetic shielding system has been greatly reinforced. The measurement resolution is determined by the signal to noise ratio, which is improved by attenuating the external magnetic noise. Furthermore, the data acquisition and control program, currently being written using LabVIEW is providing the trend graph of the measured beam current. In this graph it was observed that the amplitude of ripples in the modulated beam current increased with the beam current. Here we report the details of SQUID monitoring system and the results of the beam measurement.