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Modeling Energy Deposition in RHIC Beam Dump for Superconducting Coils

This report discusses the setup of a model based on A. SULI's work around the RHIC beam dump, focusing on soil activation concerns. Using MCNPX (v27b) on the Blue Gene/P supercomputer, the study examines the energy deposition in the superconducting portion of Q4, specifically the first 15 cm. Results are compared under various conditions, revealing average energy depositions in coils, notably around 1.68 mJ/g with standard parameters, and adjustments leading to values as low as 0.99 mJ/g. Historical insight suggests energy levels of ~2 mJ/g may lead to magnet quenching.

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Modeling Energy Deposition in RHIC Beam Dump for Superconducting Coils

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  1. A SULI student set up a model around the RHIC beam dump in the summer mainly for the soil activation problem and I’ve just used her model (minus the soil). Used MCNPX (v27b) and run in BlueGene/P supercomputer. Mainly looked at the front-most superconducting portion (1st 15 cm) of Q4 as this has the largest energy deposition. Ref: Alan Stevens’ notes (AD/RHIC/RD-97 etc.). A quick report about the effect of abort kicker to the energy deposition on the Beam Dump (@10 o’clock) Kin YIP Nov. 9, 2009

  2. Superconducting coils are where I’ve been recording the energy depositions

  3. Results (same geometry/parameters except those stated below): With a density 1.77 g/cm3 for both the C-C beam dump and graphite ─ a no. that Alan Stevens has used, and with 100 bunches of  1.31011 protons,  with the nominal kick an average energy deposition of 1.68 mJ/g   ( 8.8% statistical error) on the coils (as shown in the previous page). With 20% more kick as what Leif has prescribed  average energy deposition of 1.37 mJ/g  ( 7.5% statistical error) With the nominal kick, but density of 1.9 g/cm3 for C-C (a no. from the manufacturer, Fiber Materials Inc.) and 2.21 g/cm3 (instead of 1.77),  the average energy deposition is  0.99 mJ/g ( 6.6%). Historically (?), ~2 mJ/g may quench the magnet …

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