Keyword: shielding
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MOPG44 SNS RFQ Voltage Measurements Using X-Ray Spectrometer rfq, radiation, background, electron 154
  • A.P. Zhukov
    ORNL, Oak Ridge, Tennessee, USA
  Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725.
Absolute measurement of vane voltage is essential to understand RFQ transmission. We used a non-intrusive technique of bremsstrahlung X-ray measurement. Several windows were installed at SNS to allow measurement of the X-ray spectrum in different locations of the RFQ. A CdTe spectrometer was used to estimate spectrum cutoff energy that corresponds to the vane voltage. Different device setups are described as well as measurement accuracy and interpretation of experimental data.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG44  
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MOPG63 Recent Beam Size Measurement Result Using Synchrotron Radiation Inteferometer in TPS synchrotron, operation, radiation, synchrotron-radiation 217
  • M.L. Chen, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, W.Y. Lai, C.J. Lin, S.Y. Perng, C.W. Tsai, T.C. Tseng, H.S. Wang
    NSRRC, Hsinchu, Taiwan
  Taiwan Photon Source (TPS) has operated in 2015. An optical diagnostic beam line is constructed in TPS 40th section for the diagnostics of the electron beam properties. One instrument of the optical diagnostic beam line is a synchrotron radiation interferometer, which is operated for monitoring the beam size. By improving the optical alignment and air disturbance, the beam size is performed stable. This paper presents the modifications and recent measurement results.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG63  
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TUPG43 The Next Generation of Cryogenic Current Comparators for Beam Monitoring cryogenics, monitoring, niobium, operation 441
  • V. Tympel, J. Golm, R. Neubert, P. Seidel
    FSU Jena, Jena, Germany
  • J. Golm, T. Stöhlker
    HIJ, Jena, Germany
  • F. Kurian, M. Schwickert, T. Sieber, T. Stöhlker
    GSI, Darmstadt, Germany
  • M. Schmelz, R. Stolz
    IPHT, Jena, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  Funding: Federal Ministry of Education and Research- BMBF, contract: 05P15SJRBA
A new Cryogenic Current Comparator with eXtended Dimensions (CCC-XD) is currently under development for a non-destructive, highly sensitive monitoring of nA-intensities of beams for larger beamline diameters planned for the new FAIR accelerator facility at GSI. The CCC consists of a superconducting coil which is read out by a Superconducting Quantum Interference Device (SQUID), a flux concentrator and a superconducting shield. The new flux concentrator comprises of a specially designed, highly permeable core made of nanocrystalline material in order to assure a low-noise operation and a high system bandwidth of up to 200 kHz. The superconducting shielding of niobium has extended geometric dimensions and will suppress disturbing magnetic fields of the beamline environment effectively. New SQUID sensors with sub-μm-Josephson junctions enable extreme low-noise signals and high disturbance-suppression. The CCC-XD system and the new dedicated cryostat will be ready for testing in the CRYRING at GSI in 2017. Results from electrical measurements with the components of the new CCC-XD Setup will be presented in this work.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG43  
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WEPG40 Optimization Studies for an Advanced Cryogenic Current Comparator (CCC) System for FAIR cryogenics, simulation, pick-up, synchrotron 715
  • T. Sieber, P. Kowina, M. Schwickert, T. Stöhlker
    GSI, Darmstadt, Germany
  • J. Golm, T. Stöhlker
    HIJ, Jena, Germany
  • F. Kurian, T. Stöhlker
    IOQ, Jena, Germany
  • R. Neubert, V. Tympel
    FSU Jena, Jena, Germany
  Funding: The work is supported by BMBF (Contract number: 05P15SJRBA)
After successful tests with the GSI-CCC prototype, measuring beam intensities down to 2nA at a bandwidth of 10 kHz, a new advanced Cryogenic Current Comparator system with extended geometry (CCC-XD) is under development. This system will be installed in the upcoming Cryring facility for further optimization, beam diagnostics and as an additional instrument for physics experiments. After the test phase in Cryring it is foreseen to build four additional CCC units for FAIR, where they will be installed in the HEBT lines and in the Collector Ring (CR). A universal cryostat has been designed to cope with the various boundary conditions at FAIR and at the same time to allow for uncomplicated access to the inner components. To realize this compact cryostat, the size of the superconducting magnetic shielding has to be minimized as well, without affecting its field attenuation properties. Hence detailed FEM simulations were performed to optimize the attenuation factor by variation of geometrical parameters of the shield. The beam tests results with the GSI-CCC prototype, and the developments for FAIR, as well as the results of simulation for magnetic shield optimization will be presented.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG40  
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