MICE RFCC Module Update
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Transcript of MICE RFCC Module Update
MICE RFCC Module Update
Allan DeMelloLawrence Berkeley National Lab
MICE CM26 at Riverside California
March 26, 2010
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 2Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
MICE RFCC Module Update Overview
• RF Cavities
• RF Cavity Frequency Tuners
• Cavity RF Coupler
• RFCC Schedule
MICE RFCC Module
RF Cavity Update
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 4Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Progress Summary
• Fabrication of first 5 cavities by Applied Fusion finished in December 2009
• In February 2010 the contract was awarded to Applied Fusion for fabrication of the second 5 cavities
• Physical measurement process has been started on the first 5 cavities
• Cavity RF frequency measurements have begun
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 5Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Fabricator - Applied Fusion, Inc.
• Contract for the second 5 cavities was awarded to Applied Fusion in February
• Applied Fusion fabricated the complete RF cavity (minus spinning)
Electron beam welding machine
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 6Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
•The second batch of spun cavity shells were delivered to Applied Fusion in February
•They have started fabrication of the second group of 5 cavities
RF Cavity Shells
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 7Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Beryllium Windows
•Cavity Be windows are being fabricated by Brush Wellman Inc.
•LBNL has received three finished windows
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 8Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Be Window
•Cavity Be window alignment to nose ring looks good
•Some machining of the nose ring may be necessary to flatten mounting surface
• Be window mounted to cavity with clamping ring
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 9Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Physical Inspection
•Cavity being lifted out
of shipping crate
•Cavity mounted in fixture being lifted onto CMM
•Cavity being inspected
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 10
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Inside Profile Measurement
•Special probe to measure the inside profile of the cavity
•Cavity interior profile being measured with special probe
•The profile will be used to verify cavity RF models
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 11
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Measurement
•Cavities waiting for frequency measurement
•Dr. Li measuring cavity frequency
•The Be windows are installed to give an accurate measure of the frequency
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 12
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Progress Summary
• Fabrication of first 5 cavities by Applied Fusion finished in December 2009
• In February 2010 the contract was awarded to Applied Fusion for fabrication of the second 5 cavities
• Cavity physical measurement process started
• Cavity RF frequency measurements have begun
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 13
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Future Work
•The inside surface of each cavity needs to be electro-polished (done at LBNL)
•Physical and frequency measurements on the remaining 5 cavities when they become available
•Cavities must be “tuned” to each other for best center frequency (10 cavities) by plastic deformation if necessary (will be done at LBNL)
MICE RFCC Module
RF Cavity Frequency Tuner Update
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 15
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Tuner Progress Summary
• Tuner design is complete
• ¼ scale model has been fabricated to test flexure concept
• One full size tuner arm (for testing the system) has been fabricated
• Aluminum test cylinder (1/6 of cavity) has been fabricated
• Actuator mechanical components have been fabricated
• Actuator bellows have been delivered to LBNL
• Assembly of an actuator has begun at LBNL
• Control system components have been delivered to LBNL
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 16
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Tuners
• 24 Dynamic Cavity Frequency Tuners per Module• Tuner Actuator
•Tuners operate in a bi-directional “push - pull” mode (±2mm)
•Tuning automatically achieved through a frequency feedback loop
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 17
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Tuner Components
• Dual – action actuator
• Flexure tuner arm
• Actuator is screwed
intothe tuner
arm• Fixed
connection
• Forces are transmitted to the stiffener ring by means of “push-pull” loads applied to the tuner lever arms by the dual action actuator assembly
•Tuner/actuators are thermally independent of the vacuum vessel
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 18
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Actuator Design
•Actuator design incorporates a sealed enclosure between vacuum and air.
• Actuator is mounted to the tuner arm only
• Bellows allows angular movement for actuator
• Piston plates are joined at the perimeter
• Piston plates incorporate hard stops
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 19
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
MICE RF Cavity – Mechanical Design and Analysis
• Actuator mechanical components have been fabricated and delivered to LBNL
Prototype Actuator Components
Center plate
Lower piston
Upper piston
Lower support
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 20
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
MICE RF Cavity – Mechanical Design and Analysis
• Actuator design incorporates two bellows attached to the pistons and the center plate
Prototype Actuator Components
Upper bellow
Lower bellow
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 21
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Tuner System Analysis
• The Von Mises stress at the flexure is 29.7 kpsi
• The input load by the air actuator is 800 lbs
• The tuner arm displacement is 0.214” (~0.43” bi-directional) [movement exaggerated]
• The cavity displacement is 1.05mm per side
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 22
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Tuner Flexure and Test Ring
• Full size (3” thick) prototype tuner flexure with test ring
• Threaded actuator mounting hole
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 23
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Emerson ER3000 electronic pressure controller
•± 0.1% accuracy (over 110 psi range)
•110 psi normal operating range (120 Max.)
•Remote computer controlled
•16 required for two RFCC modules
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 24
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Tuner System Schematic
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 25
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Tuner System Components
Computer Interface
Controlled Leak Valve
Regulator
5 Micron Filter
Electronic Pressure Controller
Power Supply
Pressure Sensor
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 26
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Tuner Progress Summary
• Tuner design is complete
• ¼ scale model has been fabricated to test flexure concept
• One full size tuner arm (for testing the system) has been fabricated
• Aluminum test cylinder (1/6 of cavity) has been fabricated
• Actuator mechanical components have been fabricated
• Actuator bellows have been delivered to LBNL
• Assembly of an actuator has begun at LBNL
• Control system components have been delivered to LBNL
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 27
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Tuner Future Work
• Complete the assembly of the prototype actuator
• Assemble the complete actuation system• Test the single actuator/tuner and cylinder system
• Work on the interfacing to the RAL computers
• Order parts for 6 actuators (incorporating any refinements from the prototype)
• Fabricate 5 more tuner flexures
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 28
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
RF Cavity Frequency Tuner Future Work
• Build a cavity suspension frame
• Test of the RF tuning system with 6 tuners and actuators on a cavity
• Actuators will be manifolded together
• Frequency measurements will be taken to verify the frequency tuning range
MICE RFCC Module
Cavity RF CouplerDesign Update
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 30
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Cavity RF Coupler
Section view of cavity RF coupler
•Based on successful SNS design with a Toshiba window
•Detailed fabrication drawings of the major components are complete
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 31
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Cavity RF Coupler
•Assembly drawing of cavity RF coupler•Prototype of outer coax assembly will be made
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 32
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
• Detail drawings of major components are complete
• Sources for fabrication materials (e.g. 4” outer coax tube) have been identified
• Assembly method has been determined
Cavity RF Coupler Design Summary
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 33
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Cavity RF Coupler Future Work
•16 Toshiba windows (plus spares) need to be ordered soon because of long lead times
• Myat RF couplers need to be purchased• Prototype of the outer coax will be fabricated to verify assembly method
• Vendor selection process will be started
MICE RFCC Module Update – MICE CM26 at Riverside California
Page 34
Allan DeMello- Lawrence Berkeley National Lab – March 26, 2010
Schedule Summary