Controls and monitoring in MICE

1
Controls and monitoring in MICE

• Physics and systematics
• Controls types
• Controls list
• Data record
• M. A. Cummings April 2004 CERN

2
MICE Physics
Theory uncertainties Model and simulation
choices Currently, systematics at 50
Experimental uncertainties Design of
detectors/cooling elements Currently,
systematics at 0.1-1.0
REALITY
MEASUREMENT
SIMULATION
Beam shape and diagnostics Proper emittance
population Tracking and particle ID Cooling
channel operation
Correct geometries TRIUMF data Debugging/comparin
g simulations
(eout / ein)theory. 0.895
?
(eout / ein)exp 0.904 0.001
(statistical)
On the experimental side, now we must start
thinking about the systematic uncertainties and
how we determine them
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Systematics assumptions and questions

• Stated Goal eout/ein of ? 10 3
• Assume there will be a standard (or agreed to)
  definition of 6-D cooling.
• Assume that the tracker can give us precision
  particle position and momemtum that this wont
  contribute significantly to the error.
• Assume particle ID lt 1 error
• The main sources of systematic errors are in the
  COOLING CHANNEL and detector solenoids, which
  will need to be under control to a level such
  that up to 10 independent sources of systematics
  will be lt 10-3
• Suggested goal to keep each source of error
  lt310-4 level if at all possible.
• What are the beam diagnostics concerns in a
  single particle experiment? How is beam diffusion
  controlled? Backgrounds?

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Systematics readout

• Areas
• Beam shape and content
• Trackers and detectors
• Cooling channel
• Systematic handles
• Using the beam itself calibration runs
• Experiment staging and component combinatorics
• Defining tolerances
• Determining controls/monitoring readout onto the
  event record
• Controls
• Enviromental and backgrounds
• Particle tracking and ID (determining samples and
  emittances)
• Systematics on the cooling channel

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MICE Experiments and Systematics

• Want to record a full configuration of the
  experiment at every possible event.
• Event trigger accelerator clock (or something
  very close)
• Will be running with different configurations of
  the cooling channel components and the beam for
  calibration runs
• With RF, no beam
• without RF, beam
• without any
• with both RF and beam.
• With magnets no absorbers
• With magnets one absorber
• Magnets, with and without RF.
• Need to understand the tolerances on detectors
  and cooling channel elements necessary for
  cooling measurement
• Want to record controls data as part of each data
  event

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• Start-up systematics chart

 
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MACCs experimental controls channel list
what info source how many channels who determines
Beam diagnostics - Tilley/Drumm
Beam particle detectors Gregoire
Tracker/ particle ID - Bross/Bonesini
Magnetic Fields 12(51615) Rey/Guyot/Green
Alignment A few ISIS alignment system Black/Linde
Cryo controls - Baynham
RF (V, phase, temp) 242 8 D. Li
Magnets (temps) currents 310 32 Green
Absorbers (temps, level, pressure) 20 3 Cummings/Ishimoto
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Magnetic Field Controls
The magnetic measurement devices as from the
proposal see pages 52, 53.

• The magnet system will be operated in a variety
  of currents and even polarities
• The field maps may not simply be the linear
  superposition of those measured on each single
  magnet independently
• Forces are likely to squeeze the supports and
  move the coils in the cryostats.

Need to know the shape of the magnetic field
MG 4 sets of 3 Hall probes for EACH coil
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Cooling Channel Readout

• Cooling channel components (physics components)
• Absorber temperature and pressure
• Absorber length (optical occlusion method)
• Magnetic field measurements
• Hall probes
• power supply (currents)
• RF power, phase
• Temperatures of all component structures
• Alignment to global coordinate system
• Controls ( state of the system included in data
  record)
• LH2, Magnet and RF Safety systems (subset of
  monitoring describing the state of the system)
• Temp/flow on Helium
• Cryogenic systems
• Ambient temperature

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Beamline

• Static not expected to change with time (but
  may drift)
• Dynamic changing with time
• ISIS proton beam trigger (pulse) and
• intensity (voltage level) (dynamic)
• ISIS proton beam loss monitors - few - voltage
  level, 20 ms cycles (dynamic)
• Target position (static)
• Target drive amplitude (dynamic)
• Target drive trigger (pulse)
• Beam Diagnostics
• yet to be determined -Glasgow are looking at
  scintillators - X,Y beam profiles (N channels -
  dynamic)
• Settings of magnets (V, I) 12 elements (static)
  9 quads, 2 dipoles, 1 sc-solenoid
• Beam Line Vacuum (e.g. penning pirani)
• Diffuser in place
• Vacuum state
  Thanks Paul!
• rough pump on/off
• turbo pump on/off
•         valves open/closed (2)
•  

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Particle ID ex Cherenkov (2)

• - 8 analog channels for monitoring the
  (positive) HV's.- 8 analog channels for
  monitoring the analog responses of PM's to
  light pulses.- 1 digital output channel for
  triggering the light pulser
• - 8 TDC outputs (probably not important?
  depends on the noise levels).- 1 analog channel
  for a temperature probe- 1 analog channel for
  the He pressure inside the Cherenkov vessel.- 1
  analog channel for monitoring the humidity inside
  the vessel.
• 
  Thanks Guislain!

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How to proceed

• MACC keeper of controls list for the event record
• Responsibility for determining tolerances gt
  D(eout/ein) should be within the various detector
  groups
• Form the experimental group
• Calibration runs
• Staging
• Run physics configurations
• Run durations
• Event record (including controls)