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Cooling Channel

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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

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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

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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

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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 systemsbut they are closely linked in a closed loop

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RF Cavity & Power ControlsTuning mechanism

DSP

DSP

A

Event Bus

Eth

erne

t

Control System

Fwd/Rflct power

LINUX Box/EPICS

DS-Scope

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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

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RF Phase and Particle detection

201.25 MHz

5 ns

flat top

10V pulse16 bits:1bit~1in 104

trigger TOF 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/degreeCalibration:• Single cavity: find Emax & Emin

Possible 2 phase ambiguity but does it matter?