Assessment of BLM Thresholds in Collimation Regions for the LHC startup
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1 Assessment of BLM Thresholds in Collimation Regions for the LHC startup By Till Böhlen & BLM Team 1/11
2 Content Introduction to Protection of Collimators Approach & Work so far SPS & Simulations Simulations for LHC Setup (IR3&7) Summary 2/11
3 Collimator Types & Locations Types of Collimators Locations Active Jaw Material TCP 60cm C C TCSG 100m C C TCLA(TCT) 100m W in Cu Additionally: TCSM, TCLI(C C),TCLP(Cu),... IP IR3 Dump IR7 Exemplary Setup IP IP IP IR3 & m 3/11
4 Task: Protecting Collimators Damage & Quench Level E V ~10µsec BLM thresholds can be set: for 12 loss durations for 32 beam energies Interpolation E tot Loss Duration ~ sec Collimator Damage Levels Given by Collimation Group (R. Assmann): energy steady state intermediate (t > 10s) (10s > t > 1s) TCP: 7 TeV 90 kw 449 kw 450GeV 87 kw 430 kw TCSG: 7 TeV 9 kw 45kW 450GeV 9 kw 43kW TCLA: 7 TeV 45W 215 W 450GeV 45W 225 W (preliminary numbers, still to be completed!) 4/11 transient (1s > t)? 1.1MW(only IR3)? 110kW(only IR3)? 550W (only IR3)
5 Future Present Past Timeline IR7 Simulation shower cross talk matrices, heat in collimator jaws,... (FLUKA,ANSYS) M. Magistris, M. Leitner, M. Brugger et al., 2006 IR3 Simulation shower cross talk matrices, transversal energy distribution (MARS, K2) I. Kurochkin, Studying beam loss patterns SPS, verification: exp. vs. sim. LHC, relation: ED in jaws to Signal (FLUKA) My work tbc... FLUKA & BLM Team updated simulations for current LHC layout final shower cross talks,... Shower Cross Talk 5/11 Courtesy of I. Kurochkin
6 Our Approach By Simulation Outline Studying the relation between energy deposition (ED) in jaws and signal of BLM detectors Establish Relation: Particles Impacting on/ Energy Deposition in Collimator to Signal seen by BLM Detectors Focusing on collimation regions With LHC startup setup As Function of Impact Parameter Dose x impact Lost Proton Conservative approach Each collimator is protected by dedicated BLM pair (but shower cross talks!) Security factor of about 10 for BLM thresholds Final revision: allows for efficient LHC operation? (i.e. low false dump rate) (Range: µm mm) Misalignment Studies BLM Detectors Other Parameters e.g.: Beam Distribution, Jaw Positions Variation of BLM Signal uncertainty for BLM Thresholds 6/11
7 Losses at the LHC collimator in the SPS Experiment FLUKA Implementation Top LHC Collimator 1.75m BLMs Focus on: Collimator, BLM Detectors, Beam Tube Side Collimator 3 Detectors n! o i t a SPS LSS5 ific r e v l rs! ta o n r e r m E ri tic a m Expe e t ys S s s e ss A 7/11 Unknown model parameters: Errors: mostly 1 5%, all < 15%
8 Measurements in the SPS Conditions: x10^13 26 GeV part.x10^10 Collimator Jaw Pos.(mm) Total loss: killing beam at injection plateau with collimator 5.2 s integration time Jaw speed ~ 2mm/s Injecting Circulating time(s) But: Just 2 experimental values! Exp.: L 3.24±0.25x10 13 Gy/Prot. (R 2.31±0.24x10 13Gy/Prot.) BLM IC Response Sim.: L 3.30±0.17x10 Gy/Prot. (R 2.42±0.10x10 Gy/Prot.) (Data from BLM IC1A) 8/11
9 Simulations for LHC Setup Fluencies in detectors similar to SPS setup Computation of: Detector response/primary on collimator Detector response/total energy deposition (ED) in collimator jaw Detector response/maximal ED in collimator jaw Dose per Tot. ED (Gy/GeV in Jaw) Dose per Proton (Gy/part) Preliminary Results Depth in right jaw (cm) Depth in right jaw (cm) Example for critical failure: IC signal/max. ED = 1.94±0.13x10 14 Gy*cm3/GeV Detector response to total ED by ~50% lower for secondary shower compared to beam protons! 9/11
10 Summary Implementation of experimental setup in SPS First comparisons between meas. and sim. => agreement within 5% More measurements hopefully in this month! Final determined discrepancy of meas. model as systematic uncertainty for assessment of LHC BLM detector thresholds by simulations Ongoing implementation and computation for LHC setup by BLM & FLUKA team Assessing BLM detector threshold values based on damage limits for collimators Conservative approach for assessment of BLM thresholds Not considering shower cross talks Security margin of 10 10/11
11 Thanks for attentive... Comments and questions welcome! 11/11
12 Measurement Conditions (Add.) 08/11/07 12/11/07 Until now: 2 Session à 1h x10^13 26 GeV, Type: LHC25NS&FT, cycling mode Measurements done for varying collimator positions Acquisition of: beam current and BLM detector response Wire scanner meas. for beam width => beam width at collimator part.x10^10 Collimator Jaw Pos.(mm) 10 cycles Injecting Circulating time(s) 12/11
13 Preliminary Results (Add.) Right jaw in Left jaw in Top IC signal ratio Right/Left Sim: 0.73± /11 Exp: 0.71±0.09
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