Transcript Plans for 201-MHz Cavities Derun Li Center for Beam Physics Lawrence Berkeley National Laboratory November 18, 2010

Plans for 201-MHz Cavities
Derun Li
Center for Beam Physics
Lawrence Berkeley National Laboratory
November 18, 2010
201-MHz Cavity Programs
• Prototype cavity at the MTA
– Surface damage on RF coupler and coupler
port region
– Damage on the ceramic RF window
– Data analysis of the existing RF test results
– Window inspection tomorrow
– RF test plans
• Development of test plan at this WS
• Adding diagnostic at ceramic RF window
• RF frequency variation as a function of average RF power
(Be window heating)
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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201-MHz Cavity Programs
SC CC magnet available by
end of 2011
Ceramic RF window, copper
sputtered on the window
Sparking on loop coupler
SC CC magnet
201-MHz Cavity
Lab G Magnet
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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Status of MuCool CC Magnet
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The Coil has 96 layers and 166 turns
SC coil winding completed 1 week ago
Al banding arrived China last week
Modification of the ICST test system is
under way (making progress, but with
delays)
• Cryostat design by SINAP, the final
design review is scheduled: Dec. 9 &
10 at SINAP, Shanghai
• Fabrication of cryostat components
and cover plate welding soon
• Quench protection
• CC assembly procedures
• Cold mass test at HIT
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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201-MHz Cavity Programs
• MICE cavities
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Fabrication of ten 201-MHz cavities complete
Received eight Be windows at LBNL
Ten ceramic RF windows ordered
RF coupler design update is under way
RF tuner design and prototype
• Fabrication of six prototype tuners starts soon
– Cavity post-processing at LBNL
• Surface cleaning, EP and cavity assembly
– Cavity tuning
• Low power RF measurements of all MICE cavities
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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MICE Cavity Fabrication
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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201-MHz Cavity Programs
• Design progress of a single cavity vacuum
vessel for RF tests at MTA or CERN
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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201-MHz Cavity Programs
• Single cavity vacuum vessel
superimposed between the
magnet coils
82cm
79cm
• Single RF cavity vacuum vessel will potentially be used in a 3 T large bore magnet
to perform RF breakdown test measurements in a magnetic field at CERN in
support of the MTA at FNAL or in support of MICE
MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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201-MHz Cavity Programs
• The single cavity vacuum vessel allows us to
explore many mechanical design and assembly
issues before we have a MICE RFCC module
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Tuners
Couplers
Support
Cooling piping
Pumping
Assembly
Fixturing
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MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010
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