Direct Hits on Titanium Alloy Spoilers

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Presentation transcript:

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) 28 6 1380 2770 1st bunch fractures or melts Ti alloy Hit survivable 0.6 rl Ti 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: 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