MICE - Detector Safety/Integration

MICE - Detector Safety/Integration – Detectors external to Magnetic Volume  Detectors external to magnetic volume u All use Photo-Multiplier Tubes (PMTs) – Only active component s Power –HV: mA s Output –Low level signal –Front-end crates (can be located far (>20m) away except for TOF CAMAC/VME electronics Low voltage, 2-5 KW per crate is typical

MICE Tracker – Internal to Magnetic Volume  Detectors in magnetic volume–Trackers (2) s Fiber Tracker (scintillating fiber) –Totally passive within magnet (no power, gas, HV, etc) Electronics external – Front-end near (3m) low voltage (2 kW total) + Front-end racks within 15m –Needs Vacuum seal, however where optical signals are brought out This has been done for other experiments, vacuum level in tracker volume should be easy to obtain (depends on pumps) Electronics Optical Fiber

MICE Tracker – Internal to Magnetic Volume (Backup Option) u We also have a backup Option for the tracker s TPG (Time projection chamber with GEM readout) –Gaseous device (He-ethane) Non-flammable –HV: 50 kV on central membrane (1-10+ J stored energy) Electronics external – low voltage near end of solenoid with Front- end racks within 15m HV power supply (50 KV) to supply drift field –This device has obvious active components inside tracking volume Electronics Copper Cable 50 KV

MICE - Detector Safety/Integration  The MICE detectors do not present a safety risk given the design of the absorber focus coil system and its redundancy with regard to H 2 safety u Although parts of the detector system do present an ignition source, they are never in direct contact with H 2  Tracker system (baseline) is totally passive internal to the magnetic volume  External detectors (Cerenkov, TOF, and calorimeter) do use active components (HV), but they are outside the Hydrogen zone.