Simulations of the Study 2 Cooling Channel with Realistic Absorber Windows

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Simulations of the Study 2 Cooling Channel with
Realistic Absorber Windows

• Tom Roberts
• Illinois Institute of Technology

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Geant4 Simulations

• This is a complete reimplementation of the Study
  2 Cooling channel
• Geant4 5.0
• Fermilab Beam Tools 1.0
• HistoScope 5.0
• All results use the 2631 events from
  EmittBunch5-207-Cooler.hst
• Realistic absorber and vacuum windows
• HistoScope used to greatly speed up manual tuning

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Bellows Absorber Windows
LH2
Vacuum
Vacuum
35 cm
48 cm
216 u
180 u
36 cm
Eds Clearance
Max. Easy Value
6 cm
12 cm
(This is a hand-drawn figure roughly to scale,
actual window data are from H2-Bellow-Window-conca
ve-convex-coord-3.xls)
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(TolCooler207 is an old run)
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(TolCooler207 is an old run)
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(TolCooler207 is an old run)
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Summary at End of Cooling Channel
Cuts 140 lt P lt 260 MeV/c, Dt lt 1.1 ns,
Acclong 15,000 cm mrad, Acctrans 15,000
mm mrad
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Conclusions

• The bellows windows used in these simulations
  should achieve cooling performance comparable to
  that in Study 2.
• There are some puzzles related to RF tuning still
  under investigation.

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Backup Slides
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Beam Characteristics at End of Cooling Channel
(TolCooler207 is an old run)