# STAR shielding 2

Information about STAR shielding 2

Published on November 13, 2007

Author: Belly

Source: authorstream.com

Simulation for STAR background/shielding:  Simulation for STAR background/shielding What I am going to show is mainly: The effect of various energy cuts The effect of geometry change (poletip shielding) Slide2:  z (cm) cut: 0.5 GeV cut: 1 GeV z (cm) cut: 2.5 GeV Slide3:  X (ve  South/Outer) Slide4:  Reduction after shielding (right now, large errors) X (ve  South/Outer) 301 302 303 304 unit 10-10 GeV/g per incident particle Last time ! Slide5:  At 1 GeV cut, reduction after shielding (with large errors): unit 10-11 GeV/g per incident particle Reduction factors are similar to the case without the 1 GeV cut ! X (ve  South/Outer) Main geometry changes made:  Main geometry changes made Modified tunnel (PHENIX’s semi-circle ~Q3 to uniform rectangular tunnel) No holes at both sides of platform (where magnets sit) Put in the poletips (plus Al conductor) in front of the EEMC Put in outgoing sets of magnets on the other side Slide7:  With new geometry & 1 GeV cut, without shielding: unit 10-11 GeV/g per incident particle X (ve  South/Outer) shielded by the pole-tips (only ~35 to ~51 cm), which is more effective than 132 cm due to its position ! pole-tips now get similar energy dep. as EECM in “old geom.”, Position, position, position ! With new geometry (poletip):  With new geometry (poletip) With new geometry and 1 GeV cut, the mean energy deposition is in the order of magnitude of ~1 MeV per incident proton Slide9:  1 GeV cut & new geom.: look at the EEMC region Slide10:   pp KK p, n Depend quite a bit with different energy cuts 1 GeV cut & new geom.: look at the EEMC region Works to be done …:  Works to be done … Put in Al’s/Phil’s practical shielding to see what reduction one would get Can have different shielding setup to find the best shielding … Could hit Q2 as well … Slide12:  BACKUP slides Slide13:  Last time’s shielding configuration scales in cm 52" steel concrete soil

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