Beams Document 4519-v1

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Studies of MI Beam Intensity, Loss and Activation Patterns

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Submitted by:
Bruce C. Brown
Updated by:
Bruce C. Brown
Document Created:
28 Jan 2014, 14:28
Contents Revised:
28 Jan 2014, 17:30
Metadata Revised:
16 Feb 2017, 13:26
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In order to understand and document the radiation issues in the Main Injector tunnel created by beam losses, we need to measure the activation and residual radiation and relate it to the number and energy of proton losses and the location of those losses. Using MARS simulations, we will, in future, be relating the simulated activation and residual radiation to measured values. In this document, we will establish a technique for relating loss measurements to beam loss so that the activation and residual radiation patterns can be normalized to losses despite changes in the loss patterns resulting from improvements in beam collimation. To understand the accuracy of this loss monitor calibration, we will study patterns of loss distribution with location and time to constrain uncertainties in the overall understanding of the radiation. A preliminary result is the determination that protons lost on the secondary collimators produced an activation of 2.4879E-16 pCi/gm/p on Al Tags placed on the aisle side of the collimator outside of the marble shield. Using this result we find sensitivities for the loss monitors near the secondary collimators.
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  • Fermi Logo (fermi_logo_1.gif, 210 bytes)
  • Fig. 1 (DelPbarNNuMI2004-2012.png, 13.2 kB)
  • Fig. 2 (ActivVsBLM.png, 16.9 kB)
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