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SMTF Weekly Meeting February 2, 2006

Minutes:


Hasan

Summarizing TB discussion

4 accel(received)  4 US being made (AES)   2 Jlab

main goal 35 MV/m for cryomodule 2

Niobium 50% 50% large grain versus small grain  agreed upon.

Harry (enough material for 6)

long versus short decision?

cryomodule 3 will likely be short-what should length be? Is this
number known-is it tuner choice dependent? Choose something we will
live with. Not necessarily tied to RDR.  Hasan's suggestion to Shekhar is he
should place the order, will be able to adjust length later (may come after
info from tuner performance) 283 mm between cavities.


Franco Bedeschi reports there are planned tests on a blade tuner
at DESY-Chechia Carlo Pagani 


What shape? LL RE or regular shape --use regular Tesla shape is
answer-dark current from other shapes not measured so keep focus on 
R1 goal 35 MV /m.

Only tested single cell so far-easy to clean single cell
and new shapes have 20% higher E field.


Harry Presentation:

Transparencies available on URL.

Form T4CM international team to advance design, create work pacakages, and
establish a timeline. Carlo P. Type 4 documentation and fabrication by
end of 2006 (team of 4) 
Franco Bedeschi --ramp up on cryomodule work
after 4 months (finish up CMS work) 2 cold masses from Zanon-one for
35MV/m test at DESY and one for first US cryomdoule 
Norito Ohuchi--KEK
building two 4 cavity test vessels-get involved with ILC cryomdoule
design at Phase II of STF 
Americas T4CM Design Team- about 8 engineers led by Harry Don Mitchell
blade tuner design--Carlo has a modified design Length--iris to iris
283 mm iris to end of flange 105.6 mm type 4 all components ready for
assembly for one of these units cryomodule 2 is type 3+ -- US 10
cavities-will not reach 35 expect 25 no need for americanization by buying
Zanon cold mass

DESY kit--sealed dressed Fermi assembles type 3+  early  07
second one
DESY and KEK  plans page 36-38 Of HArry's presentation.
8 tons  is weight of one cryomodule.

Organization will be work packages with regional coordinators

Were the goals met?: Largely yes.  Franco B. -meeting great
success-team of experts feeling very good and energized engineers want
to work together work on type 4 is "starting up again" Milano meeting
at Pisa next week-slowly, but very good feeling


Harry

Plan to Meet by video once per two weeks and get together face to face
every two months Goal is to get design engineers together. Let them
solve problems.

John Mammosser

Of the 4 Accel cavities, 2 cavities are at Cornell 2 are at Fermilab
best effort is 4 cavities in FY06 first do light chemistry to see
everything is OK.  
Hasan - will BCP first cavity lightly (100
microns)in next two week- vertical test 20-25 will check for field
flatness and freq.  original plan-repeat and repeat and repeat?
Warren - we should be loose on requirements-20% may be OK.
Hasan-should we get rid of hydrogen bake at 800 C? 
Then we tune it. Fermilab has the bead pull.


Harry building tool for one cell tuning-
Hasan says he prefers to send cavity back to Fermilab for tuning and firing?
Hasan suggests to fire cavity after EP.
Goal is to finish by end of February and send to JLAB.

John worries that heavy BCP makes it hard to get a smooth surface with EP.
Hasan says BCP will find poor performing cavities-really a filter at this point

Will not test with HOMS.-blank it off.
John would prefer we fire before EP. Then another light EP will be necessary?

Aluminum seals: Harry, no vendor yet. Hasan: Hasan ordered from same
place as DESY 
Peter K. Thinks it makes sense what Hasan is doing. 
Axel will send 5 to JLAB.  Shekhar,--- Hasan, please order more for everyone!

John: What is plan for shipping?

Hasan: Do we need tight loop on EP? Shekhar--yes
Hasan: We do not need tight loop on BCP? Only EP.

What are torque specs for cavities?
What is the repair process on a damaged flange?

Tug will go to DESY and work with Axel for two weeks and will try to answer
these questions.

John M. Plan: get statistics on their RF tests using cavity S-35.


S-35 BCP+EP 11 times performance ranged from 13 MV to 30MV now at 23MV
5 or 6 chemistries -- 338 microns removed.


John Mammosser--Christian Boffo is his Fermilab technical contact


Sergei

Feb 13,14 GDE meeting at Fermilab-some stay overs for the 15th
deflecting cavities


Cristian

March 17th Materials Workshop at MSU - Pierre Bauer






Minutes taken by Nigel