Presentation Transcript
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 : pp KK 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
Catch the
buzz on authorSTREAM
Copyright © 2002-2008 authorSTREAM. All rights reserved.