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88 MHz RF STATUS

88 MHz RF STATUS. OUTLINE 1. Parameters of the 88 MHz RF in the muon cooling channel 2. Status of the high gradient test set-up 3. Preliminary parameters of an 88 MHz option for ICE. 1. Parameters the 88 MHz RF in the muon cooling channel. E 0 T = 4 MV/m  = 159 s solenoid: 40 x 20 cm

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88 MHz RF STATUS

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  1. 88 MHz RF STATUS OUTLINE 1. Parameters of the 88 MHz RF in the muon cooling channel 2. Status of the high gradient test set-up 3. Preliminary parameters of an 88 MHz option for ICE ICE workshop 25-27/10/2001

  2. 1. Parameters the 88 MHz RF in the muon cooling channel E0T = 4 MV/m  = 159 s solenoid: 40 x 20 cm ZTT = 7 M/m PPEAK = 2.04 MW/cavity Kilpatrick: 2.3 R/Q = 144  PMEAN = 49 kW/cav. for 50 Hz repetition rate ICE workshop 25-27/10/2001

  3. Power efficiency optimization using and ICE workshop 25-27/10/2001

  4. Challenges: • High gradient at low frequency (Kilpatrick: 2.3)  sparking: tests • (high) magnetic field lines penetrating the cavities  multipactor: computations & tests • large cavity dimensions  mechanical stability: computations • field emission induced by lost particles  cavity test with beam. ICE workshop 25-27/10/2001

  5. 2. Status of the high gradient test set-up Original system: PS 114 MHz RF cavity for leptons ICE workshop 25-27/10/2001

  6. 88 MHz test cavity (made from an 114 MHz structure) Closed gap case E0 = 4 MV/m frep = 1 Hz r/Q = 113   = 180 s tpulse , frep = 1 ms, 1 Hz Ppeak = 1.4 MW Pmean = 1.4 kW Kilp. = 2.3 gap = 280 mm length = 1 m diameter = 1.77 m Open gap case E0 = 4 MV/m frep = 1 Hz r/Q = 107   = 180 s tpulse , frep = 1 ms, 1 Hz Ppeak = 1.5 MW Pmean = 1.5 kW Kilp. = 2.3 gap = 260 mm length = 1 m diameter = 1.77 m ICE workshop 25-27/10/2001

  7. 88 MHz test cavity (made from an 114 MHz structure) 88 MHz cavity 2 MW amplifier Nose Cone (closed gap) ICE workshop 25-27/10/2001

  8. 88 MHz test system status and planning SUMMARY First turn-on of the complete amplifier chain: 12/2001 Setting-up on dummy load: 03/2002 High gradient in the cavity: 05/2002 Increase of RF power: 10/2002 ? Test with solenoid: 12/2002 ?? ICE workshop 25-27/10/2001

  9. 3. Preliminary parameters of an 88 MHz option for ICE Sketch of a 4 cavities module ICE workshop 25-27/10/2001

  10. Electrical power and cooling needs for the 88 MHz option in ICE => Advantage of the 10 Hz option Overall needs in infrastructure: H. Ullrich ICE workshop 25-27/10/2001

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