MCTF 8/17/06 A. Bross MTA Activities and Plans MCTF August 17, 2006 A. Bross.

MCTF 8/17/06A. Bross

MTA Activities and Plans

MCTFAugust 17, 2006

A. Bross


MuCool Program

Currently consists of 9 institutions from the US and Japan

RF DevelopmentANLFermilabIITJLABLBNLMississippi

Absorber R&DFermilabIITKEKNIUMississippiOsaka

SolenoidsLBNLMississippi

Mission Design, prototype and test all cooling channel components

(SFOFO) 201 MHz RF Cavities, absorbers, SC solenoids

Support MICE (cooling demonstration experiment) Perform high beam-power engineering test of cooling

section components


R&D Focus of MuCool Component testing Fermilab

RF Cavities– High RF-power Testing

Absorbers– Technology tests– High power-load testing

•With beam Magnets


MuCool Test Area

Facility to test all components of cooling channel (not a test of ionization cooling)

At high beam power Designed to accommodate full Linac Beam 1.6 X 1013

p/pulse @15 Hz – 2.4 X 1014 p/s

– 600 W into 35 cm LH2 absorber @ 400 MeV

RF power from Linac (201 and 805 MHz test stands)

Waveguides pipe power to MTA


MTA Hall


MTA

The MTA is the focus of our Activities

RF testing (805 and 201 MHz)

High pressure H2 gas-filled RF

LH2 Absorber tests

Two parts of infrastructure yet to be completed

Cryo Plant Beam Line


Phase I of RF Cavity Closed Cell Magnetic Field Studies (805 MHz)

Data seem to follow universal curve

Max stable gradient degrades quickly with B field

Sparking limits max gradient

Copper surfaces the problem

Gra

die

nt

in M

V/m

Peak Magnetic Field in T at the Window


Phase II of 805 MHz studies

Study breakdown and dark current characteristics as function of gradient and applied B field in Pillbox cavity

Curved Be window Test TiN coated Cavity has been

conditioned to 32MV/m without B field

Measurements at 2.5T– So Far – stable

gradient limited to about 14MV/m

Button test Evaluate various

materials and coatings Quick Change over


RF R&D – 201 MHz Cavity Design

The 201 MHz Cavity is now operating Recently reached 16MV/m at B=0 (design gradient!)


2D Transverse Cooling

and

Figure of merit: M=LRdE/ds

M2 (4D cooling) for different absorbers

Absorber Design Issues

Absorber Accelerator

Momentum loss is opposite to motion, p, p x , p y , E decrease

Momentum gain is purely longitudinal

Large emittance

Small emittance

H2 is clearly Best -Neglecting Engineering

Issues Windows, Safety


Convective Absorber Activities

First Round of studies of the KEK absorber performed in the MTA

GHe used to input power


Convective Absorber Activities II


Convective Absorber Activities III

Next Round of tests will use a modified absorber

Test Electrical Heater New

Temperature sensors

LH liquid level sensor

Absorber Body being modified in Lab 6 at Fermilab

Instrumentation will be usedin MICE


MuCool and MICE

Muon Ionization Cooling Experiment (MICE) Demonstration of “Study II” cooling channel concept

Has Phase I UK funding ($20M)

MuCool Collaboration interface to MICE Design Optimization/develop of Study II cooling channel

Simulations Detailed engineering

Full component design Systems integration Safety

RF cavity development, fabrication, and test Absorber development, fabrication, and test Development of beam line instrumentation MuCool will prototype and test cooling hardware including

MICE pieces for which the collaboration is responsible Fermilab is also contributing to the cryogenics and readout

electronics for the two fiber trackers used in the spectrometers.


MTA recent activities

Due to Tritium problem from Numi

Our cooling water feed for the MTA hall was changed to Casey’s pond

Introduced some problems that have now been remedied

LHe delivery system for magnet has been upgraded

Heat load now at spec 5T Solenoid has been re-trained

Now operates at spec Instrumentation Installed

Spark protection for 201 cavity Includes video camera and DVR

Scintillation counters Now have complete coverage for

805 and 201 systems Includes thin and thick Plastic

counters and NaI


Plans for the MTA

805 MHz RF studies (with and without B field) Long-term (1 week) conditioning at fixed gradient and 2.5T Be Window tests Materials tests Surface treatment

201 MHz RF test program B field tests

Conditioning to highest possible gradient (up 16MV/m) at max field available from magnet

Curved Be Windows Note: The 201 MHz power source from the Linac has been

offline since before the end of the shutdown Hope to have it available for our program in the next week or

two

Second round of tests with KEK LH2 convective absorber

201 MHz RF isHighest Priority!

MCTF 8/17/06 A. Bross MTA Activities and Plans MCTF August 17, 2006 A. Bross.

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