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Collimators Control P1

Collimators Control P1. Collimators controls P1. Rack for 2 collimators MDC drives the motors. Does not generate interlocks. PRS monitors the position sensors and generate interlocks. PRS. MDC. Collimators controls P1. 1 st event: 5 Oct. 2010

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Collimators Control P1

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  1. Collimators Control P1

  2. Collimators controls P1 • Rack for 2 collimators • MDC drives the motors. Does not generate interlocks. • PRS monitors the position sensors and generate interlocks PRS MDC

  3. Collimators controls P1 • 1st event: • 5 Oct. 2010 • MDC lost communication during SB or after programmed dump. • MDC remotely reset then failed and replaced. • No interlock, no beam dump • After 14 hours of SB at 200 vs 200 bunches. • Not identified as SEU • 2nd event • 27 Apr. 2011 • MDC lost during SB at 480 vs 480 bunches. • no interlock, no beam dump • Remotely reset. • Exchanged for precaution • Identified as SEE

  4. Collimators controls P1 • 3rd event: • 1 May 2011 • PRS rebooted during SB with 768 bunches. • Interlock, beam dump • Clear signature of SEU. • Radiation levels in UJ14 last week as high as from start of LHC to week before. • A few 10^6 HEH (> 20 MeV).

  5. Collimator’s controls P1 • In UJ16 the situation is almost symmetric, for some reason the radiation levels are 1.4 times lower!

  6. Collimators controls P1 • Next days of SB will confirm (or hopefully not) whether it is really a SEU. • If confirmed, no quick solution at hand • Ralph proposes to close the TCL and see if it helps… • R2E integration of P1 completed, if necessary move of collimator’s rack may be anticipated • To be discussed if SEU and low cross section (few 10^-6 HEH) confirmed.

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