Status of 201 MHz Prototype and RFCC Module
16
Status of 201 MHz Prototype and RFCC Module Derun Li, S. Virostek, M. Zisman Center for Beam Physics Lawrence Berkeley National Laboratory In collaboration with R. Rimmer, L. Phillips, G. Wu (J-Lab) M. Green, W. Lau and S. Yang (Oxford Univ.) MICE Collaboration Meeting at Osaka University August 1-3, 2004
description
Status of 201 MHz Prototype and RFCC Module. Derun Li, S. Virostek, M. Zisman Center for Beam Physics Lawrence Berkeley National Laboratory In collaboration with R. Rimmer, L. Phillips, G. Wu (J-Lab) M. Green, W. Lau and S. Yang (Oxford Univ.) MICE Collaboration Meeting at Osaka University - PowerPoint PPT Presentation
Transcript of Status of 201 MHz Prototype and RFCC Module
Status of 201 MHz Prototype and RFCC Module
Derun Li, S. Virostek, M. Zisman
Center for Beam PhysicsLawrence Berkeley National Laboratory
In collaboration with R. Rimmer, L. Phillips, G. Wu (J-Lab)M. Green, W. Lau and S. Yang (Oxford Univ.)
MICE Collaboration Meeting at Osaka UniversityAugust 1-3, 2004
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 2
Outline
• Updates of MICE RFCC Module Status 201 MHz Prototype Cavity MICE RF Power Source Development (Paul Drumm) • Summary
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 3
Updates of RFCC Module
• Integration and support of the module• 201 MHz cavity prototype (MUCOOL)• Coupling coils updates ( inputs from M. Green)
– Design– Cooling – Stress
• Interface between absorber and RFCC modules
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 4
MICE Cooling Channel Layout
Coupling coils
Eight 201 MHz cavitiesLH absorber
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 5
201 MHz Cavity Update
• Propose to use NASA e-beam welder – Due to lower priority and busy schedule for using e-beam
welder at J-Lab – Proposed to use NASA e-beam welder ~ 3 months ago
> Convenient location (~ 20 minutes driving)> Better equipped and bigger vacuum chamber> Competent technical capability
– Two to three months of delay for paper work between J-Lab and NASA
– Ready to proceed now (finally)
• Work at NASA– Nose piece welding– Port annealing + extruding– Cosmetic welding on the equator joints– …
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 6
Last MICE mgt: Ready for Equator Welding (March, 04)
HISTORY!
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 7
The Cavity Status Now
Cavity has been cleaned at J-Lab and ready for nose welding and ports annealing next week (August 2nd 2004) at NASA
Pilot holes forextruding
Beam
iris (Be
win
dow
)
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 8
201 MHz Cavity (cont’d)
Layout of water cooling lines
Development of water cooling line layout Ports and flanges RF loop coupler Cavity support structure Cavity tuner RF windows (4” ceramic) Curved Be windows (ordered) MICE specifics
Tuners Integration
joints and flanges Possible LN2 operation
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 9
201 MHz Test Plan at MTA (preliminary)
• Test plans (not necessarily in sequence)
(assume a clean and vacuum tight cavity, and available RF test stand)– Start with Cu windows (flat or curved)– May condition RF windows (ceramic) in advance– Low power measurements
> Tuners for MICE RF cavities
– Cavity conditioning– Curved Be windows with Ti-N coating– External magnetic fields?
– LN2 operation?
Comments and suggestions are welcome!
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 10
• The design for coupling coil (dimensions) has not changed since the last MICE Collaboration Meeting at CERN (March 2004)
• The coupling coil can be cooled by a single small cooler of either type (pulse tube cooler ~1 W or a GM cooler ~1.5 W), provided a liquid interface is used to connect the cooler cold head to the magnet
• The stress and deflections for the coil and its case has been calculated using FEA. The peak stress in the coil and the case is reasonable at 240 MeV/c
Progress on Coupling Coil
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 11
The New Coupling Magnet
The new coil is longer and thinner
The coil length is limited by the feeds to the 201 MHz RF cavity
The coil design has better quench properties
The coupling magnet stored energy is about 8 MJ
30 to 40 K Shield
Cooling Tube
S/C Coil
~697 mm
Cold Mass Support
Cryostat Vacuum Vessel
>1080 mm
725 mm
116.6 mm
250 mm
386 mm
201 MHz RF Cavity Vacuum Space
y
z
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 12
Coupling Coil Structure Displacement and Stress Results for 200 MeV/c Case *
* Data from S. Yang of Oxford University
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 13
Coupling Coil Structure Displacement and Stress Results for 240 MeV/c Case
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 14
Interface between AFC & RFCC
Sealing only bolts (24 each)
Sealing/force transmission/opening studs (12 each) – closed position
Open position
Bellows with flanges would be welded to both sides of RF Modules
Bellows and oversized holes in flanges can accommodate misalignments between vessels in all 6 DOF
Magnetic forces can be handled by both supports and interconnecting studs
Details of the interface
RFCC
AFC
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 15
Module Support Concept
Module Configuration Assembled Modules
MICE Collaboration Mgt in OsakaAugust 1-3, 2004
Status of 201 MHz Prototype Cavity and RFCC Module Derun Li
Center for Beam Physics LBNL Page 16
Summary
• Excellent progress on RFCC Modules since last MICE Collaboration Meeting at CERN– Integration and support– The 201 MHz cavity (MUCOOL) construction goes
reasonably well regardless of the delay at NASASignificant progress on curved window design and fabrication
> Placed purchase order of 3 curved Be windows at Brush-Wellman company
– Excellent progress on coupling coils
RF power sources (P. Drumm)
