Keyword: distributed
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MOPMA012 Intra-Beam and Touschek Scattering Computations for Beam with Non-Gaussian Longitudinal Distributions scattering, emittance, simulation, lattice 559
 
  • A. Xiao, M. Borland
    ANL, Argonne, Ilinois, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
Both intra-beam scattering (IBS) and the Touschek effect become prominent for multi-bend-achromat- (MBA-) based ultra-low-emittance storage rings. To mitigate the transverse emittance degradation and obtain a reasonably long beam lifetime, a higher harmonic rf cavity (HHC) is often proposed to lengthen the bunch. The use of such a cavity results in a non-gaussian longitudinal distribution. However, common methods for computing IBS and Touschek scattering assume Gaussian distributions. Modifications have been made to several simulation codes that are part of the {\tt elegant} toolkit to allow these computations for arbitrary longitudinal distributions. After describing these modifications, we review the results of detailed simulations for the proposed hybrid seven-bend-achromat (H7BA) upgrade lattice for the Advanced Photon Source. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPMA012  
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MOPHA030 Commissioning of the Low-Noise MTCA.4-based Local Oscillator and Clock Generation Module hardware, shielding, monitoring, controls 847
 
  • U. Mavrič, J. Branlard, M. Hoffmann, F. Ludwig, H. Schlarb
    DESY, Hamburg, Germany
  • D.R. Makowski, A. Mielczarek, P. Perek
    TUL-DMCS, Łódź, Poland
  • A. Rohlev
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  Funding: Helmholtz Validation Fund Project "MicroTCA.4 for Industry"
Within the Helmholtz Validation Fund Project "MicroTCA.4 for Industry", DESY together with collaboration partners from industry and research developed a compact fully MicroTCA chassis-integrated local RF oscillator module. The local oscillator and clock generation module generates a low noise local oscillator out of the global reference that is distributed over the accelerator. The module includes a splitting section which provides 9 local oscillator signals which are distributed over the RF-Backplane to the rear-transition modules. Similarly, the clock signal is also generated out of a single reference input by means of low-noise dividers. The clock is then fan-out to 22 differential lines that are routed over the RF backplane to the rear-transition modules. The functional block is implemented such that it fits in the rear slots 15 and 14 of a standard MTCA.4 crate. In the paper the commissioning results measured on the L3 low-level RF stations of the European XFEL will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPHA030  
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MOPHA046 !CHAOS Status and Evolution controls, framework, interface, database 894
 
  • G. Mazzitelli, C. Bisegni, S. Caschera, G. Di Pirro, L.G. Foggetta, R. Gargana, E. Gioscio, D. Maselli, A. Michelotti, R. Orrù, S. Pioli, F. Spagnoli, A. Stecchi, M. Tota
    INFN/LNF, Frascati (Roma), Italy
  • D.G.C. Di Giulio
    INFN-Roma II, Roma, Italy
  
  A synthesis of the “!CHAOS: a cloud of controls” project and its application to accelerators and large experiments will be presented. We will describe here how the !CHAOS project has evolved from a candidate for the SuperB accelerator control system to a facility for IT distributed infrastructures. !CHAOS is currently, not only suitable for accelerators and large High Energy Physics (HEP) experiments, but is also applicable to other contexts, such as social and industrial applications. Preliminary results achieved on an accelerator use case are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPHA046  
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TUPWI032 Progress on Optimization of the Nonlinear Beam Dynamics in the MEIC Collider Rings sextupole, ion, optics, dynamic-aperture 2311
 
  • Y. Nosochkov, Y. Cai, M.K. Sullivan, M.-H. Wang, U. Wienands
    SLAC, Menlo Park, California, USA
  • Y.S. Derbenev, F. Lin, V.S. Morozov, F.C. Pilat, Y. Zhang
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under US DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357. Work supported by the US DOE Contract DE-AC02-76SF00515.
One of the key design features of the Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab is a small beta function at the interaction point (IP) allowing one to achieve a high luminosity of up to 1034 cm-2s-1. The required strong beam focusing unavoidably causes large chromatic effects such as chromatic tune spread and beam smear at the IP, which need to be compensated. This paper reports recent progress in our development of a chromaticity correction scheme for the ion ring including optimization of dynamic aperture and momentum acceptance. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI032  
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WEPHA029 Operation of Both utility Systems of TPS and TLS at NSRRC controls, storage-ring, operation, instrumentation 3176
 
  • J.-C. Chang, W.S. Chan, Y.C. Chang, C.S. Chen, Y.F. Chiu, Y.-C. Chung, K.C. Kuo, Y.-C. Lin, C.Y. Liu, Y.-H. Liu, Z.-D. Tsai, T.-S. Ueng
    NSRRC, Hsinchu, Taiwan
  
  The construction of the utility system for the 3.0 GeV Taiwan Photon Source (TPS) was started in the end of 2009. The utility building for the TPS ring had been completed in the end of 2014. The final test and improvement had been completed in the end of 2014. The TPS is in commission and TLS is still in operation. Within limited manpower and budget, it is challenge to operate both utility systems stable and reliable. We provide good quality of electrical power, cooling water and precision air temperature. Power saving is also an important issue. The utility system presented in this paper includes the electrical power, cooling water, air conditioning, compressed air, and fire control systems.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA029  
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THPF032 Spin Tracking Simulations Towards Electric Dipole Moment Measurements at COSY quadrupole, solenoid, polarization, resonance 3764
 
  • M. Rosenthal, A. Lehrach
    FZJ, Jülich, Germany
  • A. Lehrach, M. Rosenthal
    RWTH, Aachen, Germany
  
  A strong hint for physics beyond the Standard Model would be achieved by direct measurements of charged particles' Electric Dipole Moments (EDMs). Measurements in magnetic storage rings using a resonant spin interaction of a radiofrequency Wien filter are proposed and needs to be scrutinized. Therefore, the calculation of phase space transfer maps for time-varying fields has been implemented into an extensions for the software framework COSY INFINITY. Benchmarking with measured data and analytical estimates for rf solenoid induced spin resonances are in good agreement. The dependence of polarization oscillation damping on the solenoid frequency could be confirmed. First studies of the rf Wien filter method reveal systematic limitations: Uncorrected Gaussian distributed misalignments of the COSY lattice quadrupoles with a standard deviation of 0.1 mm generate a similar buildup as an EDM of 5·10-19 e cm using this method.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF032  
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