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Update of the heating of ALFA detector in 2011

Update of the heating of ALFA detector in 2011. F. Caspers, P. Fassnacht, A. Grudiev, S. Jakobsen, E. Métral, B. Salvant. Courtesy Sune Jakobsen et al. Beam intensity. Temperatures in 7R1. Temperatures in 7L1. Beam energy. Detector temperature cannot increase by more than 40 degrees

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Update of the heating of ALFA detector in 2011

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  1. Update of the heating of ALFA detector in 2011 F. Caspers, P. Fassnacht, A. Grudiev, S. Jakobsen, E. Métral, B. Salvant

  2. Courtesy Sune Jakobsen et al Beam intensity Temperatures in 7R1 Temperatures in 7L1 Beam energy • Detector temperature cannot increase by more than 40 degrees • Temperature increased by max 18 degrees in 2011 • interesting to note that the temperature increase started already at injection

  3. ALFA SMARTEAM references for the relevant CATIA drawings: • ST0243713_01 • ST0040591_02 CST model

  4. CST simulations for ALFA • 3D model imported from Catia • Time domain • Ferrite 4s60 model • 40 m wake (100 m for the model with no ferrite)

  5. Power spectrum and impedance Top energy Impedance simulated by CST in Ohm Measured power spectrum from Philippe and Themis

  6. Power loss calculations Top energy Total loss  15W

  7. CST eigenmode f ~ 0.96 GHz R ~ 23kOhm Q ~ 700 Ferrite on the wrong side?

  8. CST simulations for ALFA No ferrite 2 ferrites (current situation) 4 ferrites

  9. Power loss at top energy and injection Vs detector gap • Slightly worse at injection • smaller loss for bigger gaps

  10. Outlook • Do we need to worry for 2012? • Do we take the detector out? • Cooling (as TOTEM)? • Change location of ferrites? • What to do to understand more? • Measurements with wire on a bench • Simulations with HFSS

  11. TOTEM installed cooling, but when it is off:

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