MICE RF Workshop @CERN Present: By Phone at 16: 00 CERN: FNAL: Helmut Haseroth Helmut. Haseroth@cern. ch Maurizio Vretenar Maurizio. Vretenar@cern. ch Han Broere Johannes. Broere@cern. ch Al Moretti moretti@fnal. gov LBNL: Derun Li dli@lbl. gov Mike Zisman mszisman@lbl. gov DL: Mike Dykes d. m. dykes@dl. ac. uk Andy Moss a. j. moss@dl. ac. uk Peter Corlett p. a. corlett@dl. ac. uk Joe Orrett j. f. orrett@dl. ac. uk Geneva: Alain Blondel Alain. blondel@cern. ch RAL: Paul Drumm paul. drumm@rl. ac. uk Roy Church r. a. church@rl. ac. uk paul drumm, 19 th May 2004 1
Meeting Outline: http: //hep 04. phys. iit. edu/cooldemo/rf/rfw 1. html paul drumm, 19 th May 2004 2
• Discussion: – Practicality of realising a 4 MW amplifier; • 2 MW amplifier in bits paul drumm, 19 th May 2004 3
• Discussion: – Practicality of realising a 4 MW amplifier; • 2 MW amplifier in bits – reconstruction • 4 MW – need to upgrade to a higher voltage • Tubes – TH 116 Tube no longer easily available » Old ISIS tubes removed at 2. 3 MW – TH 170 alternative tube not a 4 MW tube – 4 MW split between 4 cavities » Losses each time the power is split – Concluded too many risks paul drumm, 19 th May 2004 4
• …Discussion – Resolved to build two “ 2 MW” circuits • NF bunch rotation test circuit (88 MHz) • Old circuit rebuilt to “ 2 MW” – 1 MW in Cavity ≈ 1. 25 MW in the amplifier • “Old circuit” was limited to 1. 8 MW – Output coupling redesign – Expect to obtain up to 2. 8 MW with TH 170 tube. • Conclusion: – CERN will build two “ 2 MW” power amplifiers paul drumm, 19 th May 2004 5
Overall Picture Master Oscillator Controls etc Los Alamos HT Supplies LBNL CERN 300 k. W Amplifier 2 MW Amplifier 2 MW Amplifier HT Supplies Daresbury 201 MHz Cavity Module paul drumm, 19 th May 2004 201 MHz Cavity Module 6
Timeline… • Daresbury – Strip down and assess LBNL amplifiers – Recondition LBNL circuits – Develop Test stand 2004 2005/6 • CERN – Rebuild 88 MHz circuit back to 201 MHz – Rebuild “old” circuit 2005/6 • MICE – stage V – 4 amplifiers & 4 Cavities – ISIS old ISIS tubes close to 2 MW per cavity… – Purchase TH 116 tubes; above 2 MW per cavity 2007? • MICE – stage VI – 4 amplifiers & 8 Cavities – ISIS old ISIS tubes close to 1 MW per cavity… – TH 116 tubes; above 1 MW per cavity paul drumm, 19 th May 2004 7
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Other issues • See meeting notes… 200 -350 Me. V/c ± 0. 5 o – Phase adjustment needed? – Lifetime of old ISIS tubes at 2 MW? – Fresh look at costs: • DL can make in house… • Some spare CERN equipment (controls) • Various synergies… – “rent” TH 170 tube from CERN for tests – TH 170 tubes - part of common funds? o – Phase ± 0. 5 ; Amplitude ± 1% - sufficient? paul drumm, 19 th May 2004 11
Conclusion • Robust Scheme for 8 MW / 4 Amplifiers – Identified major components – Plan for construction – Indicative Cost Estimates • £ 620 k refurbish LBNL circuits + missing components • € 100 k to provide 2 amplifiers from CERN • € 500 k power splitting – Stage V to VI • Plus ~2 SY at DL • In the process of revising cost estimates… paul drumm, 19 th May 2004 12
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