MICE RF Cavities and RFCC Module Update Derun Li Lawrence
Berkeley National Laboratory MICE RF Workshop Daresbury Laboratory,
UK April 17, 2012 April 17, 2012 Slide 2 MICE RFCC Module MICE
Schedule Review at RAL, UK Page 2 Derun Li - Lawrence Berkeley
National Lab May 24, 2011 MICE RFCC Module Update MICE RF Workshop,
Daresbury Lab, UK Page 2 Derun Li - Lawrence Berkeley National Lab
April 17, 2012 MICE Cooling Channel Two RFCC modules, four 201-MHz
cavities per module, four ports per cavity: two of them for RF
couplers, one for vacuum pump and one for RF probe; Two beryllium
windows per cavity. Slide 3 MICE RFCC Module MICE Schedule Review
at RAL, UK Page 3 Derun Li - Lawrence Berkeley National Lab May 24,
2011 MICE RFCC Module Update MICE RF Workshop, Daresbury Lab, UK
Page 3 Derun Li - Lawrence Berkeley National Lab April 17, 2012
RFCC Module Six tuner arms & actuators per cavity, and cavity
is supported by strut system. Slide 4 MICE RFCC Module MICE
Schedule Review at RAL, UK Page 4 Derun Li - Lawrence Berkeley
National Lab May 24, 2011 MICE RFCC Module Update MICE RF Workshop,
Daresbury Lab, UK Page 4 Derun Li - Lawrence Berkeley National Lab
April 17, 2012 Current Status of RFCC Module RF Cavities and single
cavity vessel: All 11 beryllium windows received at LBNL (1 st RFCC
module) Ten ceramic RF windows received Six tuner flexures are
being fabricated at Fermilab Components for 6 actuators are being
fabricated RF coupler design has been modified to eliminate the gap
between the outer coax and the RF loop Fabrication of fixturing for
the electropolishing is nearly complete Mechanical smoothing of the
cavity inside surface before EP Single cavity vacuum vessel,
fabricated at Keller Technology in Buffalo New York, is complete
and is at Fermilab now. Slide 5 MICE RFCC Module MICE Schedule
Review at RAL, UK Page 5 Derun Li - Lawrence Berkeley National Lab
May 24, 2011 MICE RFCC Module Update MICE RF Workshop, Daresbury
Lab, UK Page 5 Derun Li - Lawrence Berkeley National Lab April 17,
2012 Beryllium Windows Eleven beryllium windows have been
fabricated so far: Eleven beryllium windows have been fabricated so
far: Curved thin (0.38-mm thick) window with TiN-coating on both
sides Curved thin (0.38-mm thick) window with TiN-coating on both
sides Received two new beryllium windows recently, these two
windows have been fabricated by Materion Electrofusion (fomer
Brush-Wellman) to replace the windows rejected due to excess
distortion with improved brazing design/technique: no distortion is
observed. Received two new beryllium windows recently, these two
windows have been fabricated by Materion Electrofusion (fomer
Brush-Wellman) to replace the windows rejected due to excess
distortion with improved brazing design/technique: no distortion is
observed. Slide 6 MICE RFCC Module MICE Schedule Review at RAL, UK
Page 6 Derun Li - Lawrence Berkeley National Lab May 24, 2011 MICE
RFCC Module Update MICE RF Workshop, Daresbury Lab, UK Page 6 Derun
Li - Lawrence Berkeley National Lab April 17, 2012 RF Cavity
Frequency Tuner Components Dual action actuator Flexure tuner arm
RF cavity Cross-section view Tuning range: 230 kHz Slide 7 MICE
RFCC Module MICE Schedule Review at RAL, UK Page 7 Derun Li -
Lawrence Berkeley National Lab May 24, 2011 MICE RFCC Module Update
MICE RF Workshop, Daresbury Lab, UK Page 7 Derun Li - Lawrence
Berkeley National Lab April 17, 2012 Cavity Frequency Tuner Flexure
Six full size tuner flexures are being fabricated at Fermilab Jan.
25-26, 2012 in Fermilab Finished tuner arm Slide 8 MICE RFCC Module
MICE Schedule Review at RAL, UK Page 8 Derun Li - Lawrence Berkeley
National Lab May 24, 2011 MICE RFCC Module Update MICE RF Workshop,
Daresbury Lab, UK Page 8 Derun Li - Lawrence Berkeley National Lab
April 17, 2012 Actuator Component Fabrication Center plate Lower
piston Upper piston Lower support Component for six actuators are
currently being fabricated by a local vendor The actuators will be
assembled at LBNL Slide 9 MICE RFCC Module MICE Schedule Review at
RAL, UK Page 9 Derun Li - Lawrence Berkeley National Lab May 24,
2011 MICE RFCC Module Update MICE RF Workshop, Daresbury Lab, UK
Page 9 Derun Li - Lawrence Berkeley National Lab April 17, 2012 RF
power (loop) coupler RF power (loop) coupler design has been
modified to eliminate the gap between the loop and the outer coax
tube Slide 10 MICE RFCC Module MICE Schedule Review at RAL, UK Page
10 Derun Li - Lawrence Berkeley National Lab May 24, 2011 MICE RFCC
Module Update MICE RF Workshop, Daresbury Lab, UK Page 10 Derun Li
- Lawrence Berkeley National Lab April 17, 2012 Testing/experience
of the prototype cavity at MTA: sparking at the coupler The coupler
design has been changed slightly to increase the gap spacing The
sparking region can be TiN coated if necessary (plan to be tested
at MTA using the prototype cavity) Adding diagnostics: arc detector
at the coupler region. RF Power (loop) Coupler (old) Old MICE
design Cross-section view MTA RF coupler Slide 11 MICE RFCC Module
MICE Schedule Review at RAL, UK Page 11 Derun Li - Lawrence
Berkeley National Lab May 24, 2011 MICE RFCC Module Update MICE RF
Workshop, Daresbury Lab, UK Page 11 Derun Li - Lawrence Berkeley
National Lab April 17, 2012 RF power (loop) coupler Modified MICE
RF power coupler design is complete, drawing package has been
delivered to FNAL, and ready for fabrication Fabrication of the
couplers should start soon Cross-section view Slide 12 MICE RFCC
Module MICE Schedule Review at RAL, UK Page 12 Derun Li - Lawrence
Berkeley National Lab May 24, 2011 MICE RFCC Module Update MICE RF
Workshop, Daresbury Lab, UK Page 12 Derun Li - Lawrence Berkeley
National Lab April 17, 2012 Cavity Measurements Cavity Measurements
Cavity physical measurementCavity frequency measurement Physical
measurements for the six remaining cavities expected to take
approximately 1-1/2 weeks (60 hours) RF measurements and tuning to
a center frequency after the EP of all ten cavities (two spares) at
LBNL. Slide 13 MICE RFCC Module MICE Schedule Review at RAL, UK
Page 13 Derun Li - Lawrence Berkeley National Lab May 24, 2011 MICE
RFCC Module Update MICE RF Workshop, Daresbury Lab, UK Page 13
Derun Li - Lawrence Berkeley National Lab April 17, 2012 Cavity
Electropolish at LBNL Cavity Electropolish at LBNL The inner
surface of each cavity will be mechanically smoothed and then
electropolished at LBNL using the similar techniques developed at
JLab for the prototype cavity Fabrication of EP fixturing is
complete and electropolishing will start in soon after ES & H
approval Electropolishing process will take approximately 1- 2 days
for each cavity or 4 weeks to complete all 10 cavities Cavity
section view EP rotation fixture at LBNL Slide 14 MICE RFCC Module
MICE Schedule Review at RAL, UK Page 14 Derun Li - Lawrence
Berkeley National Lab May 24, 2011 MICE RFCC Module Update MICE RF
Workshop, Daresbury Lab, UK Page 14 Derun Li - Lawrence Berkeley
National Lab April 17, 2012 Cavity Electropolish at LBNL (contd)
Cavity Electropolish at LBNL (contd) New fixture for EP exhaust
fabricated, testing and meeting with ES&H personnel scheduled.
Cavity section view Slide 15 MICE RFCC Module MICE Schedule Review
at RAL, UK Page 15 Derun Li - Lawrence Berkeley National Lab May
24, 2011 MICE RFCC Module Update MICE RF Workshop, Daresbury Lab,
UK Page 15 Derun Li - Lawrence Berkeley National Lab April 17, 2012
Ongoing Simulations of MICE RF Cavity Study of external magnetic
field on MICE RF cavity and coupler (Dr. Tianhuan Luo) 3D
simulations (from CAD model) using SLACs Omega-3P code: f = 201.866
MHz 3D simulations (from CAD model) using SLACs Omega-3P code: f =
201.866 MHz MP simulations, and RF breakdown studies with an
external magnetic field MP simulations, and RF breakdown studies
with an external magnetic field Slide 16 MICE RFCC Module MICE
Schedule Review at RAL, UK Page 16 Derun Li - Lawrence Berkeley
National Lab May 24, 2011 MICE RFCC Module Update MICE RF Workshop,
Daresbury Lab, UK Page 16 Derun Li - Lawrence Berkeley National Lab
April 17, 2012 Fabrication of the single cavity vacuum vessel is
complete at Keller Technology in Buffalo New York Single Cavity
Vacuum Vessel Single Cavity Vacuum Vessel and MuCool Coupling Coil
Magnet Vacuum vessel stand Vacuum vessel Vacuum vessel cover plate
Slide 17 MICE RFCC Module MICE Schedule Review at RAL, UK Page 17
Derun Li - Lawrence Berkeley National Lab May 24, 2011 MICE RFCC
Module Update MICE RF Workshop, Daresbury Lab, UK Page 17 Derun Li
- Lawrence Berkeley National Lab April 17, 2012 RFCC Future Work
RFCC Vacuum Vessel: RFCC Vacuum Vessel: Vessel design is complete
but needs to be updated to incorporate changes to the interface
with the new coupling coil cryostat design Vessel design is
complete but needs to be updated to incorporate changes to the
interface with the new coupling coil cryostat design Fixturing for
the assembly process needs to be finalized and drawings for
fabrication generated Fixturing for the assembly process needs to
be finalized and drawings for fabrication generated RFCC Module:
RFCC Module: Finalize fixturing for module assembly and shipping
Finalize fixturing for module assembly and shipping for aligning
the frequency tuners onto cavities for aligning the frequency
tuners onto cavities for inserting the cavities into vacuum vessel
for inserting the cavities into vacuum vessel shipping skid/tilt
fixturing for shipping RFCC to RAL shipping skid/tilt fixturing for
shipping RFCC to RAL Slide 18 MICE RFCC Module MICE Schedule Review
at RAL, UK Page 18 Derun Li - Lawrence Berkeley National Lab May
24, 2011 MICE RFCC Module Update MICE RF Workshop, Daresbury Lab,
UK Page 18 Derun Li - Lawrence Berkeley National Lab April 17, 2012
RFCC Future Work (contd) RF control/analysis: this workshopRF
control/analysis: this workshop
Diagnostics/control/analysis/interfacesDiagnostics/control/analysis/interfaces
LLRF control (amplitude/phase) and correlations with detectorsLLRF
control (amplitude/phase) and correlations with detectors Timing
signal from detector, and calibration & synchronization with
RFTiming signal from detector, and calibration &
synchronization with RF DL group should take the leadership and
ownership DL group should take the leadership and ownership LBNL
group will assist under MAP support LBNL group will assist under
MAP support Understanding the engineering approach and scope of
work Understanding the engineering approach and scope of work
Development of future plan and define responsibilities of each
group. Development of future plan and define responsibilities of
each group.
