Beams Document 4046-v3

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Activation of Steel and Copper Samples in the Main Injector Collimator Region

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Bruce C. Brown
Updated by:
Bruce C. Brown
Document Created:
18 Jan 2012, 10:15
Contents Revised:
01 Jun 2017, 18:30
Metadata Revised:
01 Jun 2017, 18:30
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09 Apr 2012, 18:14
30 Jan 2012, 15:47
We study the activation of copper tags and steel tags fabricated from the Main Injector laminations by the flux of secondary particles near Main Injector collimator C307. 1.5" diameter and smaller tags were activated for periods from 3 to 28 days. Two locations are used for the activation, providing different activating spectra and rates. Using a HPGe detector at the Fermilab Radionuclide Analysis Facility (RAF), we measure and analyze the gamma-ray spectra to identify the isotopes which have been produced. Normalization to the flux is accomplished by activation studies on Al tags. Detailed decay corrections are aided by pulse-by-pulse loss measurements with the Beam Loss Monitor device LI307. Copper and steel dominates the regions where beam loss activates the Main Injector tunnel so this will help identify the isotopes which dominate the residual radiation. This work is in parallel with a simulation study with MARS and DeTra which informs the measurements. The combination of simulation and measurement will benchmark the simulation system.
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Added BLM Calibration to protons lost. Expressed activation for both equilibrium and total production.
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