1. Direct Hits on Titanium Alloy Spoilers
Maximum ΔT/ 2x1010 bunch at the Hit Location, ºC/bunch
L. Keller
Nov. 2, 2005
Steering
Condition
250 GeV
Beam
Size (µ)
σx σy
Max.
Temperature (ºC/b)
Comments
500 GeV CM
1 TeV
Hit consumable 0.6 rl Ti
Betatron spoiler (SP2,4)
1380
2770
1st bunch fractures or melts Ti alloy
Hit survivable 0.6 rl Ti
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
( )
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)
25,000
~60,000
Hopefully very rare occurrence
Notes:
Ti–6Al–4V alloy – fracture 770 ºC, melt 1800 ºC
Copper – melt 1080 ºC
Nominal emittances, εx / εy = 10 / 0.04 x 10-6
See talk at Daresbury Collimation Meeting, Nov. 2-3, 2005 for details