n Beam Monitoring

1
n Beam Monitoring
m
m
um
p
m
m
p
m
m

• Hadmon will see remnant protons

• Muon Monitors see whatever escapes beam dump
  (muons?)

2
Commissioning Beamline Monitors

• Hadron Monitor
• Alignment of support structures (done during
  absorber assembly)
• Practice of removal of base through slot (also
  during absorber assembly)
• Leak check of device prior to final insertion
• Confirmation of adequate helium venting
• HV check of chambers
• Checkout of Electronics (internal calibration
  feature), ACnet data logging
• Time in signal gates (Pedestal and in spill) with
  respect to beam spill time
• Muon Monitors
• Alignment of support structures
• Aligment of detectors after mounting
• Leak check of detectors after mounting
• Confirmation of adequate helium venting
• HV check of chambers
• Checkout of Electronics, ACnet data logging
• Calibration Plateau Curves with no beam
• Time in signal gates (Pedestal, in spill, and
  calibration gates) with respect to beam spill time

3
Commissioning at Low Intensity(1011 1012 ppp)

• Perform Intensity scans with target in
• Calibrate rates versus toroid measurement
• LE,ME,HE positions required
• Perform High Voltage Scan

Intensity scan at low Intensity Checks
Linearity Of devices And determines m Monitor
response Vs target position
4
Commissioning at Low Intensity(1011 1012 ppp)

• Measurements with no target
• Sweep proton beam across hadron monitor with no
  target
• Confirm bpm/sem position and angles
• Coordinate with cross-hair study
• Find any possible cracks in hadron absorber?
• Background rates in
• muon alcoves and
• hadron monitor from
• neutrons
• Intensity scan useful here too

5
Commissioning at Low Intensity(1011 1012 ppp)

• Scan target with proton beam
• In coordination with target Budal monitor studies
• Compare with predictionsthese are probably very
  hard distributions to predict because of the
  large neutron production uncertainties
• Will be useful as spill-by-spill test of target
  integrity

6
Commissioning at High Intensity(1013 ppp)

• Intensity scan with target in, perform HV scan
• LE position
• ME position
• HE position
• Move horn 1 by 3mm
• LE,ME,HE position
• Could also be done at lower
• intensity
• Turn off horn, leave target in
• Measure neutron background rates in muon alcoves

7
Summary

• Intensity Scans important
• Low to check monitor response
• High to check ability to spot problems during run
• Horn Current Scans important
• Low current to check neutron backgrounds
• High current for physics checks
• Want Low Medium High Energy Target positions
• As target moves back, horn position changes are
  much more pronounced
• Most monitoring commissioing requests will be
• Redundant with other requests (crosshair, Budal,
  etc)