mucool overview
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MuCool Overview. Muon Cooling R&D NFMCC Meeting March 12, 2006 A. Bross. MuCool. Consists of 9 institutions from the US and Japan. Mission Design, prototype and test all cooling channel components 201 MHz RF Cavities, LH 2 absorbers, SC solenoids - PowerPoint PPT PresentationTRANSCRIPT
NFMCC Meeting 3/12/06A. Bross
MuCool Overview
Muon Cooling R&DNFMCC MeetingMarch 12, 2006
A. Bross
NFMCC Meeting 3/12/06A. Bross
MuCool
Consists of 9 institutions from the US and Japan
RF DevelopmentANLFermilabIITJLABLBNLMississippi
Absorber R&DFermilabIITKEKNIUMississippiOsaka
SolenoidsLBNLMississippi
Mission Design, prototype and test all cooling channel components
201 MHz RF Cavities, LH2 absorbers, SC solenoids Support MICE (cooling demonstration experiment) Perform high beam-power engineering test of cooling
section components
NFMCC Meeting 3/12/06A. Bross
MuCool
R&D Focus of MuCool Component testing Fermilab
High Power–Both RF and Beam
NFMCC Meeting 3/12/06A. Bross
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
NFMCC Meeting 3/12/06A. Bross
MTA Hall
NFMCC Meeting 3/12/06A. Bross
MTA
The MTA is the focus of our Activities
RF testing (805 and 201 MHz)
Installation/commissioning of Cryo-Infrastructure
High pressure H2 gas-filled RF
LH2 Absorber tests High Intensity Beam
Will start with low intensity
NFMCC Meeting 3/12/06A. Bross
Towards Experimental Hall
Refrigerator RoomRefrigerator Room• Tevatron satellite refrigerator to be operated on 5 K mode and 14 K mode (3” DE, 3” WE)• Helium and nitrogen Dewar
Compressor RoomCompressor Room• Two 400 HP 2-stage oil injected screw compressors
Heat exchanger
MTA Cryo-Infrastruture
Compressor Installation and piping are complete
Needed forMagnet Operations
andLH2 Absorber Tests
NFMCC Meeting 3/12/06A. Bross
MTA Cryo Infrastructure
Our goal was to have Cryo Plant Operational by NOW Needed signficant support from AD and PPD Cryo Groups
AD – Wet engine installation/Controls/Commissioning PPD – Transfer line system
But there was a problem Due to resource allocation to ILC cryo work, completing
the MTA Cryo by end of March did not happen Negotiations with the Lab are in progess
Start installation effort again in earnest after shutdown cryo work is completed
New goal is to be operational late Fall Running off 500L LHe dewars will cost the collaboration
approximately $3-4k/week of magnet operation Expensive! – Working to optimize system for most efficient use
of LHe
NFMCC Meeting 3/12/06A. Bross
MTA High Intensity Beam
MTA
400 MeV beamline for the MTA has been designed
Under Craig Moore/Carol Johnstone
External Beams Department Developed Engineering Design
Cost Schedule
Safety Analysis Linac Area and Beamline Shielding Assessment for MTA
The current beam line design allows for Linac diagnostic
High-Quality emittance measurement
Our goal is to bring Low Intensity to the MTA as soon as possible
NFMCC Meeting 3/12/06A. Bross
Proceeding with the MTA Beam Line
Cost Estimate: $388k (including 30% contingency) Low-Intensity initial phase
Resources: $100k from Muon Collaboration Requests
PPD Pulsed Extraction Magnets: $75k in FY06 M&S (not likely at present) Magnet stand fab
AD – SWF for installation Internal AD review November 30th. The response from the committee
was positive, but they asked a number of questions. A response to these questions has been prepared has submitted.
Review Committee’s final report:– It was agreed that the basic design philosophy is sound, and that the
diagnostic section will be of great use not only to the MTA, but to the general Linac operation as well. Assuming that the items in the above list are addressed, and that doing so identifies no new issues, then the committee can fully support the MTA beam line design.
Modifications in Linac area have just been completed Isolates future MTA beam line work from Linac operations
NFMCC Meeting 3/12/06A. Bross
MTA – Near Term Test Program
805 MHz Pill Box preparation complete11/30/05 Low power testing and conditioning begins
Currently have reached approximately 1MV/m 805 MHz high-power testing begins 1/1/06
TiN coated curved Be windows tests Various B field configurations
201 MHz cavity testing begun 3/06 Major Milestone has been reached
LH2 Absorber test Summer 06 Second phase of testing with KEK convective absorber This is dependent on new safety review
NFMCC Meeting 3/12/06A. Bross
RF Cavity R and D
ANL/FNAL/IIT/LBNL/UMiss
NFMCC Meeting 3/12/06A. Bross
Fundamental Focus Of RF R&D
Study the limits on Accelerating Gradient in NCRF cavities in magnetic field
However We believe that the behavior
of RF systems in general can be accurately described (predicted) by
Tensile strength of the material(s) used in the cavity fabrication (T)
Local surface field enhancements (eq)
Esurf = 2T//eq
This applies to all accelerating structures
In SC structures local heating becomes problem first
Follows universal curve
NFMCC Meeting 3/12/06A. Bross
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
dien
t in
MV/
m
Peak Magnetic Field in T at the Window
NFMCC Meeting 3/12/06A. Bross
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
NFMCC Meeting 3/12/06A. Bross
RF R&D – 201 MHz Cavity Design
The 201 MHz Cavity is now operating Recently reached 16MV/m at B=0! (design gradient)
NFMCC Meeting 3/12/06A. Bross
Local Electrode Atom Probe (LEAP) Tomography
Atom probe experiments in collaboration with Northwestern U.Prof. David Seidman Jason Sebastian (Northwestern),P. Bauer, C. Boffo (FNAL), J. Norem (ANL)
High Gradient material studies relevant to both NCRF and SCRF – ILC, Neutrino Factory, Muon Collider, CLIC.
Surface microstructure Surface contamination (oxides etc.) Breakdown and Dark Currents
Data from these tests expand our knowledge of breakdown phenomena, will allow us to develop a detailed model of the physics of breakdown in cavities, and can provide a guide for materials/fabrication procedures for RF cavities
Atom Probe Data from Nb sample @ ~10 GV/m Modeling Fracture
NFMCC Meeting 3/12/06A. Bross
High Pressure H2 Filled Cavity WorkMuon’s Inc
High Pressure Test Cell Study breakdown properties
of materials in H2 In B field next
NFMCC Meeting 3/12/06A. Bross
Absorber R and D
IIT/KEK/NIU/Osaka/UMiss
NFMCC Meeting 3/12/06A. Bross
2D Transverse Cooling
and
Figure of merit: M=LRdE/dsM2 (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
NFMCC Meeting 3/12/06A. Bross
Absorber Design Issues
Design Criteria High Power Handling
Study II – few 100 W to 1 KW with “upgraded” (4MW) proton driver
10 KW in ring cooler– Must remove heat
Safety issues regarding use of LH2 (or gaseous H2)
Window design paramount– H2 containment
Proximity to RF adds constraints (ignition source)
Two Design Approaches Convective Cooling
– Shown to the right Forced flow
– High power handlingH2 implies engineering complexity
NFMCC Meeting 3/12/06A. Bross
Convective Absorber Activities
First Round of studies of the KEK absorber performed in the MTA
GHe used to input power
NFMCC Meeting 3/12/06A. Bross
Convective Absorber Activities II
NFMCC Meeting 3/12/06A. Bross
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
NFMCC Meeting 3/12/06A. Bross
Forced-Flow Absorber Heat removed with external heat exchanger
LH2 pumped from absorber to heat exchanger Nozzles in flow path establish turbulent flow Simulation via 2D and 3D FEA
Preliminary engineering design for implementation in the MTA Have taken possession of cooling loop & heat exchanger from SAMPLE
experiment @ Bates/MIT Prototype Absorber manifold has been fabricated
NFMCC Meeting 3/12/06A. Bross
MuCool Plans for the Coming Year
After a long pause due to the loss of our 805 MHz RF test facility in Lab G at Fermilab, we are now up and running again
805 MHz RF studies (with and without B field) Be Window tests Materials tests Surface treatment Use information from LEAP studies
201 MHz RF test program off to a Rousing start! B field tests Curved Be Windows
Second round of tests with KEK convective absorber IIT ME thesis student to work on flow-absorber
simulation and test Complete MTA cryo infrastructure installation and
commission system Continue installation of 400 MeV beam line from Linac to
the extent that resources allow Have the capability for low-intensity experiments
RFHighest Priority!
NFMCC Meeting 3/12/06A. Bross
The MuCool Test Area Potential
The MuCooL Test Area is becoming a tremendous resource It has the potential to provide a Unique
(World-wide) R&D facility Multi-frequency RF test capability (NC and SC) Hydrogen Safety
– Absorbers– Gas-filled RF cavities
Cryo-infrastructure (LN, high capacity LHe) High-Intensity beam