Beams Document 4867-v1

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Calibration of BLM Response to Proton Loss

Document #:
Beams-doc-4867-v1
Document type:
Note
Submitted by:
Bruce C. Brown
Updated by:
Bruce C. Brown
Document Created:
23 Jun 2015, 14:06
Contents Revised:
30 Jun 2015, 17:21
DB Info Revised:
30 Jun 2015, 17:21
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  • Public document
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Other Versions:
Beams-doc-4867-v0
23 Jun 2015, 14:09
Abstract:
Protons are lost in the Main Injector at or near the 8 GeV injection energy. This loss has been successfully localized by the collimators to deposit its energy in the MI300 collimator region. We will show that a loss model which assumes protons are lost at the collimator locations and the nearby Beam Loss Monitors (BLM's) provide a response proportional to the number of protons lost. Simulations suggest that 80% of the lost beam power is deposited in the secondary collimators. Additional BLM's in the area respond to the secondary particles but are not required to understand the proton loss. We calibrate these BLM's with the activation of the secondary collimators as measured by the residual radiation on the collimator aisle side. An alternative calibration using the activation of Al tags provides a similar measured sensitivity. An additional consistent calibration is obtained by fitting the weekly loss as measured by the toroids to the weekly sum of the BLM response. This document will refine the loss studies reported in Beams-doc-4519 [1].
Files in Document:
Other Files:
  • Fermilab Logo (fermi_logo_1.gif, 210 bytes)
  • Plot (AlTagYearlyNormalizedBLM.png, 55.1 kB)
  • Plot (BeamLossDelta.jpg, 85.0 kB)
  • Plot (BeamLossError.jpg, 79.3 kB)
  • Plot (BeamLossProtons.jpg, 79.1 kB)
  • Plot (ColActFits.jpg, 83.0 kB)
  • Plot (ColActFitsLate.jpg, 60.2 kB)
  • Plot (DelPbarNNuMI2004-2012.png, 13.2 kB)
  • Plot (InjGapLossFrac.png, 15.3 kB)
  • Plot (InjGapLossFracLoss.png, 16.8 kB)
  • Plot (Loss522wCommColl.png, 18.6 kB)
  • Plot (MI103LossDist.png, 16.9 kB)
  • Plot (MI113LossDist.png, 18.8 kB)
  • Plot (MI113LossFrac.png, 15.0 kB)
  • Plot (MI113LossStudy.png, 17.6 kB)
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