1 paul drumm, 19 th May 2004 MICE RF By Phone at 16:00 FNAL: Al Moretti LBNL: Derun Li

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Presentation transcript:

1 paul drumm, 19 th May 2004 MICE RF By Phone at 16:00 FNAL: Al Moretti LBNL: Derun Li Mike Zisman Present: CERN: Helmut Haseroth Maurizio Vretenar Han Broere DL: Mike Dykes Andy Moss Peter Corlett Joe Orrett Geneva: Alain Blondel RAL: Paul Drumm Roy Church

2 paul drumm, 19 th May 2004 Meeting Outline:

3 paul drumm, 19 th May 2004 Discussion: –Practicality of realising a 4MW amplifier; 2 MW amplifier in bits

4 paul drumm, 19 th May 2004 Discussion: –Practicality of realising a 4MW amplifier; 2 MW amplifier in bits – reconstruction 4 MW – need to upgrade to a higher voltage Tubes –TH116 Tube no longer easily available »Old ISIS tubes removed at 2.3 MW –TH170 alternative tube not a 4 MW tube –4 MW split between 4 cavities »Losses each time the power is split –Concluded too many risks

5 paul drumm, 19 th May 2004 …Discussion –Resolved to build two “2MW” circuits NF bunch rotation test circuit (88MHz) Old circuit rebuilt to “2MW” –1 MW in Cavity ≈ 1.25 MW in the amplifier “Old circuit” was limited to 1.8MW –Output coupling redesign –Expect to obtain up to 2.8 MW with TH170 tube. Conclusion: –CERN will build two “2MW” power amplifiers

6 paul drumm, 19 th May 2004 Overall Picture 2 MW Amplifier Master Oscillator Controls etc 201 MHz Cavity Module 2 MW Amplifier 201 MHz Cavity Module LBNL CERN 300 kW Amplifier HT Supplies Los Alamos HT Supplies Daresbury

7 paul drumm, 19 th May 2004 Timeline… Daresbury –Strip down and assess LBNL amplifiers2004 –Recondition LBNL circuits2005 –Develop Test stand 2005/6 CERN –Rebuild 88MHz circuit back to 201 MHz2005/6 –Rebuild “old” circuit MICE – stage V –4 amplifiers & 4 Cavities2007? –ISIS old ISIS tubes close to 2MW per cavity… –Purchase TH116 tubes; above 2MW per cavity MICE – stage VI –4 amplifiers & 8 Cavities –ISIS old ISIS tubes close to 1MW per cavity… –TH116 tubes; above 1MW per cavity

8 paul drumm, 19 th May 2004

9

10 paul drumm, 19 th May 2004

11 paul drumm, 19 th May 2004 Other issues See meeting notes… –Phase adjustment needed? –Lifetime of old ISIS tubes at 2MW? –Fresh look at costs: DL can make in house… Some spare CERN equipment (controls) Various synergies… –“rent” TH170 tube from CERN for tests –TH170 tubes - part of common funds? –Phase ±0.5 o ; Amplitude ±1% - sufficient? ±0.5 o MeV/c

12 paul drumm, 19 th May 2004 Conclusion Robust Scheme for 8 MW / 4 Amplifiers –Identified major components –Plan for construction –Indicative Cost Estimates £620k refurbish LBNL circuits + missing components €100k to provide 2 amplifiers from CERN €500k power splitting – Stage V to VI Plus ~2 SY at DL In the process of revising cost estimates…