Direct Hits on Titanium Alloy Spoilers

1
L. Keller Nov. 2, 2005
Direct Hits on Titanium Alloy Spoilers Maximum
?T/ 2x1010 bunch at the Hit Location, ºC/bunch
Steering Condition 250 GeV Beam Size (µ) sx sy Max. Temperature (ºC/b) Max. Temperature (ºC/b) Comments
Steering Condition 250 GeV Beam Size (µ) sx sy 500 GeV CM 1 TeV CM Comments
Hit consumable 0.6 rl Ti Betatron spoiler (SP2,4) 28 6 1380 2770 1st bunch fractures or melts Ti alloy
Hit survivable 0.6 rl Ti Betatron spoiler (SP2,4) 111 9 290 560 Survive two bunches at 500 GeV, one bunch at 1 TeV CM
Hit survivable 1.0 rl Ti Energy spoiler (SPE) ?E/E 0.06/0.03 15 (58 11) at 500 GeV 260 720 Big increase in temperature from 500 Gev to 1 TeV CM because of smaller ?E/E
Hit AB3 (30 cm copper) 20 1.4 25,000 60,000 Hopefully very rare occurrence
Notes

1. Ti6Al4V alloy fracture 770 ºC, melt 1800 ºC
2. Copper melt 1080 ºC
3. Nominal emittances, ex / ey 10 / 0.04 x 10-6
4. See talk at Daresbury Collimation Meeting, Nov.
   2-3, 2005 for details