mice rfcc module update allan demello lawrence berkeley national lab mice cm26 at riverside...

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

Allan 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



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



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



•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



RF Cavity Beryllium Windows

•Cavity Be windows are being fabricated by Brush Wellman Inc.

•LBNL has received three finished windows



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



RF Cavity Physical Inspection

•Cavity being lifted out

of shipping crate

•Cavity mounted in fixture being lifted onto CMM

•Cavity being inspected



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



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



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



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



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



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



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



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 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 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



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



Tuner Flexure and Test Ring

• Full size (3” thick) prototype tuner flexure with test ring

• Threaded actuator mounting hole



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



RF Cavity Tuner System Schematic



RF Cavity Tuner System Components

Computer Interface

Controlled Leak Valve

Regulator

5 Micron Filter

Electronic Pressure Controller

Power Supply

Pressure Sensor



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



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



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



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



Cavity RF Coupler

•Assembly drawing of cavity RF coupler•Prototype of outer coax assembly will be made



• 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



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



Schedule Summary

mice rfcc module update allan demello lawrence berkeley national lab mice cm26 at riverside...

Documents

complete rf cavity

cavity rf models

window cavity

cavity cavity interior

cmm cavity

cavities rf cavity shells

riverside california

shipping crate cavity