MuCool Test Area http://mice.iit.edu/mta/ Dedicated facility built at the end of the Linac to address MuCool needs RF power (12MW @ 805MHz, 4.5MW @ 201MHz)

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Presentation transcript:

MuCool Test Area http://mice.iit.edu/mta/ Dedicated facility built at the end of the Linac to address MuCool needs RF power (12MW @ 805MHz, 4.5MW @ 201MHz) Large-bore 5T superconducting solenoid Cryogenic plant 400-MeV H- beamline Class-100 portable clean room Hydrogen safety infrastructure 805- and 201-MHz cavities Radiation detectors June 27, 2017 Alan Bross | MICE cm48, Belgrade

Alan Bross | MICE cm48, Belgrade MTA Diagnostics RF directional coupler and pickup signals Vacuum pressure Scintillator+PMT counters for X-ray rates, spectra Ionization chambers for radiation dose rates Spectrometer for cavity light analysis Thermocouples for cavity temperature Acoustic sensors for spark detection (under development) Toroids for beam intensity BPM, MW and scintillator for beam profile/position Environmental monitoring June 27, 2017 Alan Bross | MICE cm48, Belgrade

Vacuum Pillbox Cavity R&D 805-MHz Modular Cavity (SLAC/LBNL) Latest R&D vehicle for detailed systematic studies Modular design for easy assembly, parts replacement Removable endplates (Cu, Be, TiN coated surfaces) Coupling iris moved to center ring and field reduced (more realistic design) RF design validated by detailed simulation Ports for instrumentation June 27, 2017 Alan Bross | MICE cm48, Belgrade

Modular Cavity Program Microscope setup in clean room for detailed endplate inspection after every run Allowing us to keep track of surface features Breakdown study Ph. D. project for Alexey Kochemirovskiy (U. Chicago) Supervisor Daniel Bowring June 27, 2017 Alan Bross | MICE cm48, Belgrade

Modular Cavity: Cu endplates B=0 T, Apr-Oct 2015 13M pulses, 130 sparks, 45 MV/m B=3 T, Dec 2015 5M pulses, 55 sparks, <12 MV/m B=0 T, Jan-Feb 2016 14M pulses, 460 sparks, 22 MV/m B=3 T, Apr 2016 3M pulses, 81 sparks, ~10 MV/m June 27, 2017 Alan Bross | MICE cm48, Belgrade

Inspection after B=0 run ~500 documented spots on surface look relatively flat No correlation between opposing endplates Representative features below June 27, 2017 Alan Bross | MICE cm48, Belgrade

Inspection after B=3T run 168 spots on surface Clearly visible damage, qualitatively different structure B=3 T June 27, 2017 Alan Bross | MICE cm48, Belgrade

Inspection after B=3T run Perfect matching between endplates Radial distribution consistent with E-field pattern June 27, 2017 Alan Bross | MICE cm48, Belgrade

Modular Cavity: Be endplates Results PRELIMINARY Be+Be, B=3 T, Apr 2017 11M pulses, 160 sparks, 37 MV/m Be+Be, B=0 T, Apr 2017 80k pulses, 1 spark, 37 MV/m Be+Cu, B=3 T, May-Jun 2017 13M pulses, ~40 sparks June 27, 2017 Alan Bross | MICE cm48, Belgrade

Alan Bross | MICE cm48, Belgrade Status/schedule Next Modular Cavity run starting this week Be endplates in several B-field settings To be completed Jul 14 Fermilab accelerator complex maintenance period starts Jul 7 Disassembly, inspection afterward End of MTA program decommissioning before Oct future use of facility TBD June 27, 2017 Alan Bross | MICE cm48, Belgrade

Alan Bross | MICE cm48, Belgrade MTA program (2005-2017) 8 cavities operated HPRF-1, short pillbox, MICE prototype, rectangular box, HPRF-2, long pillbox (all-season), MICE production, Modular in dozens of different configurations solid endplates, single/dual buttons, thin curved Be windows, single/dual grids with and without magnetic field including 3 beam tests June 27, 2017 Alan Bross | MICE cm48, Belgrade

Alan Bross | MICE cm48, Belgrade Highlights Pillbox cavity operation -- basic building block for muon cooling channels Thin curved Be windows -- needed for pillbox cavities with muons Identified vacuum cavity issues in B-field Tested different materials looking for breakdown limits Demonstration of magnetic insulation Demonstration of pressurized cavity (HPRF) concept minimal conditioning, no B-field effect Measurement of beam-induced plasma loading in HPRF Demonstration of dielectric loading in HPRF SRF techniques applied to Cu (MICE) cavities high-gradient operation with no conditioning sparks Demonstration of mechanical tuning system in large (MICE) cavity Successful operation of MICE RF prototype module at well beyond required gradient; tracker backgrounds explored Well-controlled systematics, surface inspection with Modular Cavity no performance degradation in B-field for Be endplates June 27, 2017 Alan Bross | MICE cm48, Belgrade