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@INPROCEEDINGS{Hoffstaetter:309980,
      author       = {Hoffstaetter, G. H. and Holzer, B. and Willeke, F. and
                      Meseck, A.},
      title        = {{M}easurement of {HERA}'s {C}entral {RF} {F}requency},
      reportid     = {PUBDB-2016-04121, DESY-M-02-01T},
      pages        = {398-400},
      year         = {2002},
      abstract     = {For the HERA luminosity upgrade the horizontal emittance of
                      the electron beam was reduced from 41 nm to 22 nm firstly by
                      an increased quadrupole focusing in the arcs’ FODO
                      structures and secondly by a change of the damping partition
                      numbers by means of an rf frequency shift.The stronger
                      focusing alone, which increases the phase advance per FODO
                      cell from 60 to 72 degrees, would only reduce the emittance
                      to 35 nm. It was therefore critical for the luminosity
                      upgrade to make sure that there is sufficient room in the
                      damping window for increasing the frequency of HERA’s 500
                      MHz system by the required 300 Hz. For this purpose HERA’s
                      rf frequency had to be compared to the central frequency of
                      the ring, for which the design orbit goes through the center
                      of the quadrupoles. Since the accuracy of most methods of
                      finding the central frequency is quite limited, we have used
                      7 different methods. Their results and their accuracies are
                      compared in this paper.},
      month         = {Jun},
      date          = {2002-06-03},
      organization  = {The 8th European Particle Accelerator
                       Conference, Paris (France), 3 Jun 2002
                       - 7 Jun 2002},
      keywords     = {talk: Paris 2002/06/03 (INSPIRE) / electron p: storage ring
                      (INSPIRE) / luminosity: upgrade (INSPIRE) / RF system:
                      resonance (INSPIRE) / measurement: resonance (INSPIRE) /
                      quadrupole lens: special focusing (INSPIRE) / beam:
                      absorption (INSPIRE) / beam emittance (INSPIRE) / DESY HERA
                      Stor (INSPIRE)},
      cin          = {M(-2012)},
      cid          = {$I:(DE-H253)M_-2012_-20130307$},
      pnm          = {Facility (machine) HERA (POF1-HERA-20130405)},
      pid          = {G:(DE-H253)POF1-HERA-20130405},
      experiment   = {EXP:(DE-H253)HERA(machine)-20150101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)8},
      doi          = {10.3204/PUBDB-2016-04121},
      url          = {https://bib-pubdb1.desy.de/record/309980},
}