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Ott, O.

Paper Title Page
MOPD095 Various Improvements to Operate the 1.5 GeV HDSM at MAMI 927
 
  • M. Dehn, O. Chubarov, H. Euteneuer, R.G. Heine, A. Jankowiak, H.-J. Kreidel, O. Ott
    IKP, Mainz
  
 

During the last three years at the 1.5 GeV Harmonic Double Sided Microtron (HDSM)* of MAMI a lot of improvements concerning the longitudinal operation of the accelerator were tested and installed. To monitor the rf power dissipated in the accelerating sections, their cooling water flow and its temperature rise are now continuously logged. Phase calibration measurements of the linacs and the rf-monitors revealed nonlinearities of the high precision step-motor driven waveguide phase shifters. They were recalibrated to deliver precise absolute values. Thereby it is now possible to measure not only the first turn's phase very exactly, but also determine the linac's rf-amplitude within an error of less than 5%, using the well known longitudinal dispersion of the bending system. These results are compared to the thermal load measurements. For parity violating experiments the beam energy has to be stabilised to some ppm. A dedicated system measuring the time-of-flight through a bending magnet is now used in routine operation and controls the output energy via the proper linac phases.


* K.-H. Kaiser et al., NIM A 593 (2008) 159 - 170, doi:10.1016/j.nima.2008.05.018

  
THPD025 Recent Status of the MAMI-C Accelerator and First Experiences with the Energy Upgrade towards 1.6 GeV 4328
 
  • R.G. Heine, K. Aulenbacher, M. Dehn, H. Euteneuer, A. Jankowiak, P. Jennewein, H.-J. Kreidel, U. Ludwig-Mertin, O. Ott, G.S. Stephan, V. Tioukine
    IKP, Mainz
  • O. Chubarov
    Siemens AG, Erlangen
  
 

The university of Mainz institute for nuclear physics is operating the microtron cascade MAMI (Mainzer Mikrotron) since the late 1970ies. The microtron delivers a cw electron beam to users of the hadron physics community. The recent, fourth stage MAMI-C having a design energy of 1.5 GeV is operated since 2006*. This article deals with the recent developments and operational experiences of MAMI-C, as well as with the energy upgardes to 1.56 GeV** and as final step towards 1.6 GeV. The final increase of beam energy was due to user demands, since it is expected to raise the event rate of the eta prime production by an order of magnitude.


* A.Jankowiak, et al., EPAC08, Genoa, Italy, p.51 (MOZCM01)
** A. Jankowiak, et al., PAC09, Vancouver, Canada (WE6PFP111)