MADMARS Beam Line Builder and Main Injector collimation

MAD-MARS Beam Line Builder and Main Injector collimation Igor Rakhno Accelerator Physics Department May 24, 2007

Main Injector collimation at slip-stacking injection • There are 8 dipoles and ≈ dozen quads in the 200 -m region. • Our goal was to design an appropriate radiation shielding for the region. • There is a primary collimator (thin tungsten plate) and 4 secondary ones (big structures). 2

Practical observations • For a single dipole it might be makes sense to build the geometry model without MMBLB. • For two dipoles we could still work without MMBLB. • For three dipoles, from now on, I will use MMBLB. 3

Advantages • If one makes an error in a model when using Nonstandard geometry, it would be time-consuming to correct it for a model with 1000 spatial cells. MMBLB reduces the complexity of the entire model to the complexity of a single section. • An output file BL_ELEMENTS gives detailed info on the sections. 4

Sample of BL_ELEMENTS type name s(cm) DRIFT 3 DRIFT 0 5. 00+00 Q 230 3. 00+02 ……………. . length(cm) NNON_min 5. 00+00 3. 05+02 1 3 NNON_max 2 15 5

Surface water activation 6

Surface water activation 7

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Surface water activation – Q 230 thru Q 301 10

Surface water activation 11

Surface water activation – S 2 12

Surface water activation – S 2 13

Residual dose – Q 230 thru Q 301 14

Residual dose – Q 301 15

Residual dose – Q 301 thru Q 310 16

Absorbed dose – trim dipole H 232 17

Absorbed dose – S 1 18

Absorbed dose – S 2 19

Neutron spectra: Q 301–S 1 (red) and Q 308–S 1 (black) 20

Neutron (black) and proton (red) spectra DS S 1 21