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Weingartner, R.

Paper Title Page
WEPD012 Cryogenic Design of a PrFeB-Based Undulator 3111
 
  • J. Bahrdt, H.-J. Baecker, M. Dirsat, W. Frentrup, A. Gaupp, D. Pflückhahn, M. Scheer, B. Schulz
    Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronen-Speicherring BESSY II, Berlin
  • F.J. Grüner, R. Weingartner
    LMU, Garching
  • D. Just
    Technische Universität Berlin, Berlin
  • F.H. O'Shea
    UCLA, Los Angeles, California
 
 

In col­lab­o­ra­tion with the Lud­wig-Max­i­m­il­ian-Uni­ver­si­ty Mu­nich a cryo­genic PrFeB- based un­du­la­tor has been built. The 20-pe­ri­od de­vice has a pe­ri­od length of 9mm and a fixed gap of 2.5mm. The un­du­la­tor has re­cent­ly been in­stalled at the laser plas­ma ac­cel­er­a­tor at the Max-Planck-In­sti­tute for Quan­tenop­tik. The op­er­a­tion of a small gap de­vice at a high emit­tance elec­tron beam re­quires sta­ble mag­net­ic ma­te­ri­al. A high co­er­civ­i­ty is achieved with PrFeB- ma­te­ri­al which is cooled down to 50K. This tem­per­a­ture is 100K lower as com­pared to the tem­per­a­ture of a Nd­FeB-based cryo­genic un­du­la­tor. In this paper we pre­sent the me­chan­ic and cryo­genic de­sign and com­pare the pre­dic­tions with mea­sured data. The re­sults are ex­trap­o­lat­ed to a 2m-long vari­able gap un­du­la­tor.