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MICE RFCC Module Update Allan DeMello Lawrence Berkeley National Laboratory MICE CM33 at University of Glasgow, Scotland June 26, 2012
MICE RFCC Module Update
Allan DeMelloLawrence Berkeley National Laboratory
MICE CM33 at University of Glasgow, Scotland June 26, 2012
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 2Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 2Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Current Status of RFCC Module• RF Cavities and single cavity vessel:
• All 11 beryllium windows received at LBNL (1st RFCC module)• Ten ceramic RF windows received• Six tuner flexures have been fabricated at Fermilab• Components for 6 actuators have been fabricated• RF coupler design has been modified to eliminate the gap between the
outer coax and the RF loop• Electropolishing of the first cavity is complete• Measurements of the remaining six cavities to start in next fiscal year• Cavity inside surface mechanical smoothing and subsequent
electropolishing to start in next fiscal year at LBNL• Single cavity vacuum vessel, fabricated at Keller Technology in Buffalo
New York, is complete and is at Fermilab now.
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 3Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 3Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Beryllium Windows
• Eleven beryllium windows have been fabricated (1st RFCC module)
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 4Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 4Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
RF Cavity Frequency Tuner Components
• Dual – action actuator
• Flexure tuner arm
• RF cavity
Cross-section viewTuning range: ± 230 kHz
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 5Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 5Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Cavity Frequency Tuner Flexure
Six tuner flexures have been fabricated at Fermilab
Finished tuner flexure arm
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 6Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 6Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Actuator Component Fabrication
Center plate
Upper piston
Lower piston rod
• Component for six actuators have been fabricated• A second prototype actuator (photo above) has been assembled and tested for bellows
performance of a new vendor• 12 additional bellows will be ordered• Six actuators will be assembled at LBNL for the single cavity test at Fermilab
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 7Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 7Allan DeMello- Lawrence Berkeley National Lab – June 26, 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
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 8Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 8Allan DeMello- Lawrence Berkeley National Lab – June 26, 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 Ti-N coated if necessary (will be tested at MTA
using the prototype cavity)• Adding diagnostics: arc detector at the coupler region
RF Power (loop) Coupler
Old MICE design
Cross-section view MTA RF coupler
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 9Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 9Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
RF Power (loop) Coupler
• Modified MICE RF power coupler design is complete and nearly ready for fabrication
• Fabrication of the couplers will start soon at Fermilab
Cross-section view
Cross-section view
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 10Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 10
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Cavity Measurements
Cavity physical measurement Cavity 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. • This activity will begin in the next fiscal year
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 11Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 11
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Cavity Electropolish at LBNL
• The inner surface of each cavity will be mechanically smoothed and then electropolished at LBNL using the techniques developed at JLab for the prototype cavity
• Electropolishing process will take approximately 1- 2 days for each cavity or 4 weeks to complete all 10 cavities
Cavity section viewEP rotation fixture
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 12Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 12
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Cavity Electropolish at LBNL
• Fabrication of EP fixturing is complete and approved for use by EH&S
• Electropolishing has been done on one cavity• Electropolishing of the remaining nine cavities will
resume in the next fiscal year at LBNL
EP finishedEP setup in plating shop at LBNL
View inside of finished cavity
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 13Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 13
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Ongoing Simulations of MICE RF CavityStudy of external magnetic field on MICE RF cavity and coupler (Dr. Tianhuan Luo)
• 3D simulations (from CAD model) using SLAC’s Omega-3P code: f = 201.866 MHz • MP simulations, and RF breakdown studies with an external magnetic field
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 14Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 14
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Single RF Cavity Vacuum Vessel
Single Cavity Vacuum Vessel Exploded View
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 15Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 15
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Single Cavity Vacuum Vessel
The single cavity vacuum vessel is complete and at Fermilab
MICE Vacuum Vessel (cavities removed)
Single cavity vacuum vessel is designed with all of the same ports that the MICE RFCC vacuum vessel will have
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 16Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 16
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
RFCC Future Work• Vacuum Vessel:
• 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 of the vacuum vessel to the coupling coil needs to be finalized and drawings for fabrication generated
•RFCC Module:
• Finalize fixturing for module assembly and shipping• for aligning the frequency tuners onto cavities• for inserting the cavities into vacuum vessel• shipping skid/tilt fixturing for shipping RFCC to RAL
MICE RFCC Module – MICE Schedule Review at RAL, UK
Page 17Derun Li - Lawrence Berkeley National Lab – May 24, 2011
MICE RFCC Module Update – MICE CM33 at University of Glasgow, Scotland
Page 17
Allan DeMello- Lawrence Berkeley National Lab – June 26, 2012
Plan and Schedule
• RFCC module schedule is mainly determined by the schedule of CC magnets
• Schedule of RFCC fabrication is being developed, testing of the 1st CC cold mass dominates the current schedule
