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Shinton, I.R.R.

Paper Title Page
WEPEC052 Higher Order Modes in Third Harmonic Cavities for XFEL/FLASH 3007
 
  • I.R.R. Shinton, R.M. Jones, N. Juntong
    UMAN, Manchester
  • N. Baboi
    DESY, Hamburg
  • N. Eddy, T.N. Khabiboulline
    Fermilab, Batavia
  • T. Flisgen, H.-W. Glock, U. van Rienen
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock
  
 

We anal­yse the high­er order modes in the 3.9GHz bunch shap­ing cav­i­ties re­cent­ly in­stalled in the XFEL/FLASH fa­cil­i­ty at DESY. We re­port on re­cent ex­per­i­men­tal re­sults on the fre­quen­cy spec­trum, both beam and probe based. These are com­pared to those pre­dict­ed by fi­nite el­e­ment com­put­er codes, glob­alised scat­ter­ing ma­trix cal­cu­la­tions and a two-band cir­cuit model. This study is fo­cused on the dipole com­po­nent of the multi­band ex­pan­sion of the wake­field.

  
WEPD018 Status of COLDDIAG: a Cold Vacuum Chamber for Diagnostics 3126
 
  • S. Gerstl, T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe
  • V. Baglin
    CERN, Geneva
  • C. Boffo, G. Sikler
    BNG, Würzburg
  • T.W. Bradshaw
    STFC/RAL, Chilton, Didcot, Oxon
  • R. Cimino, M. Commisso, B. Spataro
    INFN/LNF, Frascati (Roma)
  • J.A. Clarke, D.J. Scott
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • M.P. Cox, J.C. Schouten
    Diamond, Oxfordshire
  • R.M. Jones, I.R.R. Shinton
    UMAN, Manchester
  • A. Mostacci
    Rome University La Sapienza, Roma
  • E.J. Wallén
    MAX-lab, Lund
  • R. Weigel
    Max-Planck Institute for Metal Research, Stuttgart
  
 

One of the still open is­sues for the de­vel­op­ment of su­per­con­duct­ing in­ser­tion de­vices is the un­der­stand­ing of the beam heat load. With the aim of mea­sur­ing the beam heat load to a cold bore and the hope to gain a deep­er un­der­stand­ing in the beam heat load mech­a­nisms, a cold vac­u­um cham­ber for di­ag­nos­tics is under con­struc­tion. The fol­low­ing di­ag­nos­tics will be im­ple­ment­ed: i) re­tard­ing field an­a­lyz­ers to mea­sure the elec­tron flux, ii) tem­per­a­ture sen­sors to mea­sure the total heat load, iii) pres­sure gauges, iv) and mass spec­trom­e­ters to mea­sure the gas con­tent. The inner vac­u­um cham­ber will be re­mov­able in order to test dif­fer­ent ge­ome­tries and ma­te­ri­als. This will allow the in­stal­la­tion of the cryo­stat in dif­fer­ent syn­chrotron light sources. COLD­DI­AG will be built to fit in a short straight sec­tion at ANKA. A first in­stal­la­tion at the syn­chrotron light source DI­A­MOND is under dis­cus­sion. Here we de­scribe the tech­ni­cal de­sign re­port of this de­vice and the planned mea­sure­ments with beam.