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n Beam Monitoring

Learn about the beam monitoring techniques and alignment practices conducted in commissioning workshops for Hadron and Muon Monitors. Topics include device calibration, helium venting confirmation, and detector alignment.

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n Beam Monitoring

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  1. n Beam Monitoring • Hadmon will see remnant protons m+ m+ um p m+ m+ p+ m+ m+ • Muon Monitors see whatever escapes beam dump (muons?) Debbie Harris Sacha Kopp, Commissioning Workshop

  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 Debbie Harris Sacha Kopp, Commissioning Workshop

  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 Debbie Harris Sacha Kopp, Commissioning Workshop

  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 Debbie Harris Sacha Kopp, Commissioning Workshop

  5. Commissioning at Low Intensity(1011 – 1012 ppp) • Scan target with proton beam • In coordination with target Budal monitor studies • Compare with predictions—these 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 Debbie Harris Sacha Kopp, Commissioning Workshop

  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 Debbie Harris Sacha Kopp, Commissioning Workshop

  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) Debbie Harris Sacha Kopp, Commissioning Workshop

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