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Kin YIP Nov. 9, 2009

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.

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Kin YIP Nov. 9, 2009

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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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