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Controls and monitoring in MICE

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Controls and monitoring in MICE Physics and systematics Controls types Controls list Data record M. A. Cummings April 2004 CERN MICE Physics MICE Experiments and ... – PowerPoint PPT presentation

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Title: 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
3
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?

4
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

5
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

6
  • Start-up systematics chart

 
7
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
8
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
9
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

10
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)
  •  

11
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!

12
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)
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