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

MCTF 8/17/06 A. Bross MuCool Program  Currently consists of 9 institutions from the US and Japan RF Development ANL Fermilab IIT JLAB LBNL Mississippi Absorber R&D Fermilab IIT KEK NIU Mississippi Osaka Solenoids LBNL Mississippi  Mission u Design, prototype and test all cooling channel components (SFOFO) u 201 MHz RF Cavities, absorbers, SC solenoids u Support MICE (cooling demonstration experiment) u Perform high beam-power engineering test of cooling section components

MCTF 8/17/06 A. Bross  R&D Focus of MuCool u Component testing Fermilab s RF Cavities –High RF-power Testing s Absorbers –Technology tests –High power-load testing With beam s Magnets

MCTF 8/17/06 A. Bross MuCool Test Area  Facility to test all components of cooling channel (not a test of ionization cooling) u At high beam power s Designed to accommodate full Linac Beam s 1.6 X Hz – 2.4 X p/s –  600 W into 35 cm LH MeV u RF power from Linac (201 and 805 MHz test stands) s Waveguides pipe power to MTA

MCTF 8/17/06 A. Bross MTA Hall

MCTF 8/17/06 A. Bross MTA  The MTA is the focus of our Activities u RF testing (805 and 201 MHz) u High pressure H 2 gas- filled RF u LH 2 Absorber tests  Two parts of infrastructure yet to be completed u Cryo Plant u Beam Line

MCTF 8/17/06 A. Bross Phase I of RF Cavity Closed Cell Magnetic Field Studies (805 MHz)  Data seem to follow universal curve u Max stable gradient degrades quickly with B field  Sparking limits max gradient  Copper surfaces the problem Gradient in MV/m Peak Magnetic Field in T at the Window

MCTF 8/17/06 A. Bross Phase II of 805 MHz studies  Study breakdown and dark current characteristics as function of gradient and applied B field in Pillbox cavity u Curved Be window Test s TiN coated s Cavity has been conditioned to 32MV/m without B field s Measurements at 2.5T –So Far – stable gradient limited to about 14MV/m u Button test s Evaluate various materials and coatings s Quick Change over

MCTF 8/17/06 A. Bross RF R&D – 201 MHz Cavity Design  The 201 MHz Cavity is now operating u Recently reached 16MV/m at B=0 (design gradient!)

MCTF 8/17/06 A. Bross  2D Transverse Cooling and  Figure of merit: M=L R dE  /ds M 2 (4D cooling) for different absorbers Absorber Design Issues H 2 is clearly Best - Neglecting Engineering Issues Windows, Safety

MCTF 8/17/06 A. Bross Convective Absorber Activities  First Round of studies of the KEK absorber performed in the MTA u GHe used to input power

MCTF 8/17/06 A. Bross Convective Absorber Activities II

MCTF 8/17/06 A. Bross Convective Absorber Activities III  Next Round of tests will use a modified absorber  Test u Electrical Heater u New Temperature sensors u LH liquid level sensor Absorber Body being modified in Lab 6 at Fermilab Instrumentation will be used in MICE

MCTF 8/17/06 A. Bross MuCool and MICE  Muon Ionization Cooling Experiment (MICE) u Demonstration of “Study II” cooling channel concept s Has Phase I UK funding ($20M)  MuCool Collaboration interface to MICE u Design Optimization/develop of Study II cooling channel s Simulations u Detailed engineering s Full component design s Systems integration s Safety u RF cavity development, fabrication, and test u Absorber development, fabrication, and test u Development of beam line instrumentation u 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.

MCTF 8/17/06 A. Bross MTA recent activities  Due to Tritium problem from Numi u Our cooling water feed for the MTA hall was changed to Casey’s pond s Introduced some problems that have now been remedied  LHe delivery system for magnet has been upgraded u Heat load now at spec  5T Solenoid has been re-trained u Now operates at spec  Instrumentation Installed u Spark protection for 201 cavity s Includes video camera and DVR u Scintillation counters s Now have complete coverage for 805 and 201 systems s Includes thin and thick Plastic counters and NaI

MCTF 8/17/06 A. Bross Plans for the MTA  805 MHz RF studies (with and without B field) u Long-term (1 week) conditioning at fixed gradient and 2.5T u Be Window tests u Materials tests u Surface treatment  201 MHz RF test program u B field tests s Conditioning to highest possible gradient (up 16MV/m) at max field available from magnet u Curved Be Windows u Note: The 201 MHz power source from the Linac has been offline since before the end of the shutdown s Hope to have it available for our program in the next week or two  Second round of tests with KEK LH 2 convective absorber 201 MHz RF is Highest Priority!