Attendees:
KEK: S. Fukluda, M. Akemoto
DESY: W. Bialowons
FNAL: B. Chase, O. Nezhevenko, C. Jensen
SLAC: C. Adolphsen; R. cassel, C. Nantista, R. Larsen
The meeting concentrated on cost reduction strategies and plans.
I. COST REDUCTION CANDIDATES
At the upcoming Valencia meeting we will have to submit a new estimate based on our best efforts at cost reduction. Candidates discussd at this meeting were as follows:
1. Modulator: Marx.
2. Klystron: Sheet Beam
3. Distribution: Customize to eliminate circulators and 3-stub tuners.
4. Pulse Charger: Adopt and make cost estimate of architecture proposed by Cassel (Central 10kV DC converter and satellite ~2 kV chargers at each station). Cassel to work with Corvin.
5. LLRF (Chase):
A. Place 100:1 down-mixers in tunnel to drop cable costs by 10X.
B. Multiplex forward and reflected power RF signals in tunnel to save cable plant.
C. Go to single larger penetration with steel conduit for DC power and copper conduit for signals, shared with two water-cooled waveguides. One penetration costs ~$15K so save $30K/station.
D. Multiplex motor drives for the 24 single cavity tuner motors.
E. Eliminate core processor redundnacy in ATCA crates (saves $8K per station)
6. Rack Power: Recalculate reduced power requirements for above LLRF options.
PLAN: Develop preliminary cost estimates for all the above by next week. Submit changes to CCB (Adolphsen).
II. ADDITIONAL DISCUSSION
1. Fukuda is researching sheet beam klystron rumors in Japan. He will also forward the specifications for the Toshiba L-Band 10MW tube and inquire about status of fixing previous problems.
2. Fukuda will provide improved estimates for Distribution elements that were coonsiderably higher than others at the Vancouver meeting.
3. Bialowons questioned the water temperature of klystrons and was informed that Neubauer was in process of researching with local companies. Running warmer will be cheaper and possibly tubes can be stacked to save water.
4. Jensen mentioned that people at FNAL are considering HV DC distribution via superconducting lines (80% power) with satellite 20% switchers at each station.
5. Jensen believes the latest drawings of the BDC RF station may have inadvertantly left off the 34kV-480V transformer.
6. Regarding the half-lumi proposal that leaves out every second station, Adolphsen reports that this has not been adopted at the present time. Since it savesonly 2% cost, it is not a very convincing case, especially if we can knock 40-50% off the station cost by the above strategies.
III. CONCLUSION
Let's try to have a first cut new estimate for all 5 items in (I.) by next week.
Ray Larsen
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