Crab Cavity Failure Matrix Failure modes Update with
Crab Cavity Failure Matrix – Failure modes • Update with max orbit excursion • Update max head tail contribution • Losses seem low for 0. 88, 2, 0. 7, … sigma orbit excursion ( halo between 4. 5 and 5. 5 sigma contains ~ 6 e 11 p 0. 6 MJ) statistics problem? • Extend simulations to more turns? • Perform simulation for 90 degree phase shift? • Verify values. § Crab Cavity Failure Case Matrix Daniel Wollmann 1
Crab Cavity Failure Matrix – Combined failures • Input from RF required for HW failures • Gather input from different groups. § Crab Cavity Failure Case Matrix Daniel Wollmann 2
Studies / Plots for Hollow e-lens review § Plots with integrated losses and turn by turn losses § Max orbit excursion versus crab cavity voltage § Max head tail oscillation versus crab cavity voltage. § Plot integrated losses after 1/3/10/20 turns versus crab cavity voltage. § 1 CC failure with 7 MV. Daniel Wollmann 3
Hi. Lumi Annual Meeting § Preliminary schedule of parallel session: https: //indico. cern. ch/event/549979/timetable/ 20161115. detailed Daniel Wollmann 4
Example of losses due to D 1 failure – LHC, 6. 5 Te. V, 40 cm beta* § § For the first 100 turns for a D 1 powering failure (exponential decay of the current). In order to ensure redundant protection, the BLM threshold for the shortest running sum is lowered. Losses Orbit shift Courtesy M. Valette 5
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