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@INPROCEEDINGS{Singer:301888,
      author       = {Singer, W. and Kaiser, H. and Singer, X. and Gonin, I. and
                      Zhelezov, I. and Khabibullin, T. and Kneisel, P. and Saito,
                      K.},
      title        = {{H}ydro {F}orming of {TESLA} {C}avities at {DESY}},
      address      = {Hamburg},
      publisher    = {DESY},
      reportid     = {PUBDB-2016-02947, DESY-M-00-04ZC. JLAB-ACC-00-20},
      pages        = {327-329},
      year         = {2000},
      abstract     = {Since several years the development of seamless niobium
                      cavity fabrication by hydro forming is being pursued at
                      DESY. This technique offers the possibility of lower cost of
                      fabrication and perhaps better rfperformance of the cavities
                      because of the elimination of electron-beam welds, which in
                      the standard fabrication technique have sometimes lead to
                      inferior cavity performance due to defects. Several single
                      cell 1300 MHz cavities have been formed from high purity
                      seamless niobium tubes, which are under computer control
                      expanded with internal pressure while simultaneously being
                      swaged axially. The seamless tubes have been made by either
                      back extrusion and flow forming or by spinning or deep
                      drawing. Standard surface treatment techniques such as high
                      temperature post purification, buffered chemical
                      polishing(BCP), electropolishing (EP) and high pressure
                      ultra pure water rinsing (HPR) have been applied to these
                      cavities. The cavities exhibited high Q - values of 2 x
                      10$^10$ at 2K and residual resistances as low as 3 n$\Omega$
                      after the removal of a surface layer of app. 100 $\mu$m by
                      BCP. Surprisingly, even at high gradients up to the maximum
                      measured values of E$_{acc}$ $\approx$ 33 MV/m the Q-value
                      did not decrease in the absence of field emission as often
                      observed. After electropolishing of additional 100 $\mu$m
                      one of the cavities reached an accelerating gradient of
                      E$_{acc}$ $\geq$ 42 MV/m.},
      month         = {Jun},
      date          = {2000-06-26},
      organization  = {The 7th European Particle Accelerator
                       Conference EPAC 2000, Vienna (Austria),
                       26 Jun 2000 - 30 Jun 2000},
      keywords     = {talk: Vienna 2000/06/26 (INSPIRE) / RF system:
                      superconductivity (INSPIRE) / RF system: fabrication
                      (INSPIRE) / niobium (INSPIRE) / RF system: surface (INSPIRE)
                      / RF system: impedance (INSPIRE) / electric field: upper
                      limit (INSPIRE) / electron positron: linear collider
                      (INSPIRE) / linear collider: proposed (INSPIRE) / DESY TESLA
                      Linac (INSPIRE)},
      cin          = {M(-2012)},
      cid          = {$I:(DE-H253)M_-2012_-20130307$},
      pnm          = {No facility / HGF program None (POF1-890)},
      pid          = {G:(DE-H253)POF1-HGF-No-Prog-20130405},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)8},
      doi          = {10.3204/PUBDB-2016-02947},
      url          = {https://bib-pubdb1.desy.de/record/301888},
}