1 paul drumm, 19 th may 2004 mice rf workshop @cern by phone at 16:00 fnal: al moretti...
TRANSCRIPT
1paul drumm, 19th May 2004
MICE RF Workshop @CERN
By Phone at 16:00
FNAL:Al Moretti [email protected]
LBNL:Derun Li [email protected] Zisman [email protected]
Present:
CERN:Helmut Haseroth [email protected] [email protected] Broere [email protected]
DL:Mike Dykes [email protected] Moss [email protected] Corlett [email protected] Orrett [email protected]
Geneva:Alain Blondel [email protected]
RAL:Paul Drumm [email protected] Church [email protected]
2paul drumm, 19th May 2004
Meeting Outline: http://hep04.phys.iit.edu/cooldemo/rf/rfw1/rfw1.html
3paul drumm, 19th May 2004
• Discussion:– Practicality of realising a 4MW amplifier;
• 2 MW amplifier in bits
4paul drumm, 19th 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
5paul drumm, 19th 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
6paul drumm, 19th May 2004
Overall Picture
2 MW Amplifier
2 MW Amplifier
Master OscillatorControls etc
201 MHz Cavity Module
2 MW Amplifier
2 MW Amplifier
201 MHz Cavity Module
LBNL
CERN300 kW Amplifier
300 kW Amplifier
300 kW Amplifier
300 kW Amplifier
HT Supplies
Los Alamos
HT Supplies
Daresbury
7paul drumm, 19th May 2004
Timeline…• Daresbury
– Strip down and assess LBNL amplifiers 2004– Recondition LBNL circuits 2005– Develop Test stand 2005/6
• CERN– Rebuild 88MHz circuit back to 201 MHz 2005/6– Rebuild “old” circuit
• MICE – stage V– 4 amplifiers & 4 Cavities 2007?– 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
8paul drumm, 19th May 2004
9paul drumm, 19th May 2004
10paul drumm, 19th May 2004
11paul drumm, 19th 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 ±0.5o; Amplitude ±1% - sufficient?
200 250 300 350 4001
0.5
0
0.5
1
phase change (degees)MeV/c
degr
ees
±0.5o200-350 MeV/c
12paul drumm, 19th 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…