paul drumm daq&c-ws august/september 2005 1 Cooling Channel
paul drumm daq&c-ws august/september 2005 2 Physics Parameters Monitoring system can record many parameters, but: What are the critical parameters? Is the following sufficient? –Beam Line & Target Almost irrelevant Dipole one = momentum of pions Dipole two = momentum setting of muon beam Diffuser = energy loss = momentum into MICE –Poor measurement & p measured by TOF and Tracker Use Table of settings –record table-ID when loaded –“All ok” should be a gate condition –Magnets/Absorber Table of settings as above –RF – more dynamic information is needed High Q system – what does this mean for V & ? Tuning mechanism – no details yet – pulse to pulse
paul drumm daq&c-ws august/september 2005 3 Superconducting magnets Current Setting –Process control – turn on/off/adjust –Passive monitoring – status Power supply = lethargic parameters Transducers = V&I Temperature monitoring Magnetic field measurements –3d Hall probes –CANBus – PCI/USB/VME interfaces available Feedback system or… Fault warnings –Temperatures / operational features MLS Record Settings, Report Faults, “All ok” in gate
paul drumm daq&c-ws august/september 2005 4 Absorber (and Focus Coils) Absorber & Focus Coil Module –Mike Courthold’s talk on Hydrogen & Absorber Systems Process control Passive monitoring –Suit of instruments: »Temperature »Fluid Level »Thickness (tricky) Fault warnings –MLS Record Settings, Report Faults, “All ok” in gate
paul drumm daq&c-ws august/september 2005 5 RF (& Coupling Coil) RF Cavity –Tuning –Cavity Power Level (Amplitude) –Cavity Phase RF Power –LL RF (~kW) –Driver RF (300kW) –Power RF (4MW) MICE has separate tasks to develop cavity and power systems but they are closely linked in a closed loop
paul drumm daq&c-ws august/september 2005 6 RF Cavity & Power Controls Tuning mechanism DSP A Event Bus Ethernet Control System Fwd/Rflct power LINUX Box/ EPICS DS-Scope
paul drumm daq&c-ws august/september 2005 7 RF sequence of events Trigger: event determined by (G)MS (etc) –After some programmed delay –RF powered up –Power Controlled to a set point Hardware phase & amplitude measurement Amplitude in “fast” closed loop Phase in “slow” closed loop –Cavity tuning depends on error signals
paul drumm daq&c-ws august/september 2005 8 RF Phase and Particle detection 201.25 MHz 5 ns flat top 10V pulse 16 bits: 1bit~1in 10 4 triggerTOF 0 & 1 : 6m@c = ~20ns TOF 2 : +10m@c = ~50ns Proposal: Each cavity generates a Zero crossing point (e.g. -ve slope): TDC between TOF1 & next Z/C resolution ~ 5ns/360=14ps/degree Calibration: Single cavity: find E max & E min Possible 2 phase ambiguity but does it matter?