Simulations of the Study 2 Cooling Channel with

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Simulations of the Study 2 Cooling Channel with Realistic Absorber Windows Tom Roberts Illinois

Simulations of the Study 2 Cooling Channel with Realistic Absorber Windows Tom Roberts Illinois Institute of Technology TJR 02/21/2003 1

Geant 4 Simulations • This is a complete reimplementation of the Study 2 Cooling

Geant 4 Simulations • This is a complete reimplementation of the Study 2 Cooling channel – Geant 4 5. 0 – Fermilab Beam Tools 1. 0 – Histo. Scope 5. 0 • All results use the 2631 events from Emitt. Bunch 5207 -Cooler. hst • Realistic absorber and vacuum windows • Histo. Scope used to greatly speed up manual tuning TJR 02/21/2003 2

Bellows Absorber Windows LH 2 Vacuum 48 cm 35 cm 180 u Vacuum 216

Bellows Absorber Windows LH 2 Vacuum 48 cm 35 cm 180 u Vacuum 216 u 36 cm Ed’s Clearance 6 cm 12 cm Max. Easy Value (This is a hand-drawn figure roughly to scale, actual window data are from H 2 -Bellow-Window-concave-convex-coord-3. xls) TJR 02/21/2003 3

(Tol. Cooler 207 is an old run) TJR 02/21/2003 4

(Tol. Cooler 207 is an old run) TJR 02/21/2003 4

(Tol. Cooler 207 is an old run) TJR 02/21/2003 5

(Tol. Cooler 207 is an old run) TJR 02/21/2003 5

(Tol. Cooler 207 is an old run) TJR 02/21/2003 6

(Tol. Cooler 207 is an old run) TJR 02/21/2003 6

Summary at End of Cooling Channel * Cuts: 140 < P < 260 Me.

Summary at End of Cooling Channel * Cuts: 140 < P < 260 Me. V/c, |Dt| < 1. 1 ns, Acclong = 15, 000 cm mrad, Acctrans = 15, 000 mm mrad TJR 02/21/2003 7

Conclusions • The bellows windows used in these simulations should achieve cooling performance comparable

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. TJR 02/21/2003 8

Backup Slides TJR 02/21/2003 9

Backup Slides TJR 02/21/2003 9

Beam Characteristics at End of Cooling Channel (Tol. Cooler 207 is an old run)

Beam Characteristics at End of Cooling Channel (Tol. Cooler 207 is an old run) TJR 02/21/2003 10