MICE CM /10/ RAL1 M. Apollonio IC - London beam line optics

MICE CM /10/ RAL2 beam line status: ∙ estimated proton flux from measurements ∙ rates from GVA1/GVA2 analysis (reminder) ∙ optics availability ∙ sw availability ∙ hw main issues [solenoid/diffuser] conclusions & future plans ∙ reduced rate and actions ∙ matching MICE layout

MICE CM /10/ RAL3 reminder on desired features P  = [140 MeV/c, 240 MeV/c],  p/p = +/- 10% easily tunable matched emittance: 1 mm rad <  N < 10 mm rad deliverable to MICE high purity muon beam high rate “600 muons” per target actuation [1 Hz, 1 ms window] acceptable losses for ISIS Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL  production/capture  decay  transport match to MICE MICE:  –  decay beam line beam line constituted by 4 parts Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL5 10 ms 20 ms target working principle 1 ms titanium blade dipping at 1 Hz in the ISIS proton beam intercept just ~1ms of ISIS accelerated beam withdrawal must be quick to avoid scraping next filling  extreme accelerations (80g) beam loss must comply with ISIS requirements [P. Hodgson, CM22 19/10/08] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL6 some key questions: how many protons per spill are we generating? and then pions/muons? rate in april/may with a D1-D2 line for protons how much beam can we “shave” before “disturbing” ISIS operations [K.Long, CM22 19/10/08]? initial simulation of ISIS beam with ORBIT and comparison with signals from BLMs [A. Dobbs, CM22 19/10/08] how well we understand the line? alignment magnets Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL7 IC2: >29/3 BM1: >29/3 GVA1: > 4/4GVA2: > 29/3 BM2:>29/3 MICE beamline: magnet configuration and detector locations (march/april) D1 D2 I D1 =400 A  P D1 =480 MeV/c I D2 =170 A  P D2 =450 MeV/c  p~30 MeV/c Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL8 proton target 50/128 Hz 2ms acq. gate GVA1/2 active for 100 s R8BLM1 signal ~ 50 mV GVA1=14 p/dip(1ms), GVA2= 4p/dip(ms) it corresponds to 2.6E9 (+/-1.3E9) PoT (G4Beamline) x500 less Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL9 [K.Long] Scaled beam loss: HEP Test Beam target: –200 mV beam loss at 50 Hz –Corresponds to ‘loss’ of: 2.4 × 109 protons per dip 1.2 × 1011 protons per sec MICE target –Beam loss: Corresponding to ‘loss’ of 1.2 × protons per sec … i.e. per dip (at 1 Hz) is 2 V i.e mV 600 good μ/spill from 1.7 × protons Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL10 [K.Long] Conclusions: Goal: –Increase particle rate in MICE Muon Beam HEP Test Beam target: –Indicates that to achieve desired rate may require upgrade to collimation system Radiation surveys: –To date: No evidence for dose in DSA or MICE Hall No evidence for activation of ISIS Tools for the understanding of beam loss and particle rate –In place … –… but, improvements still required (e.g. r/o BPM) Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL11 ISIS Beam [A. Dobbs] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL12 [A. Dobbs] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL13 [A. Dobbs] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL14 june 2 nd june 3 rd count rates: G4beamline predictions vs measurements MC / meas: discrepancy x2 Comparing G4Beamline to DATA (june): see how well we understand the Q-poles Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL15 Comparing G4Beamline to DATA (june) MC DATA GVA1/GVA2= GVA1/GVA2= (x6.60) 833(x11.57) GVA1/GVA2= (x3.65) 2603 (x4.66) GVA1/GVA2= 3.13  6.3%  -29% 2016 (x6.60) 1297 (x18. / x1.56) GVA1/GVA2= (x4.01) 5077 (x9.07/ x1.95) GVA1/GVA2= 0.57  11% greatest effect, amplified by a long drift CASE1 CASE2 CASE3 GVA1 GVA2 Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL16 What do we know of Q1-3 ? magnet measurements: g (meas.) = / (u.s.) / (d.s.) 50 A g (specs) = A Leff(specs) = mm [no measurement available] magnet positioning: geometrical survey  slight misalignment Q1-3 axis to tgt point G4Beamline implementation: follows values as given in NOTE 066 (T. Roberts) Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL17 TEST: vary Q1-3 Leff to check possible systematics Leff (mm) GVA1 (MC) GVA2 (MC) R1 [data] (GV1/306) R2 (GV2/72) -10% % [4.0] 18.0 [9.1] +5% Question: can we be so wrong in determining Leff ? [data] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL o Q4-point-1 Q4-point-6 Inclined_Frame_2 Inclined_Frame_1 Inclined_Frame_3 geometrical survey study lowest point 24.5 mm ??? mm Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL19 ~15 mm ~4 mm to Q1 x y zz x y slight mis-alignment should not cause great change in rate ISIS beam coordinates in ISIS frame 25 o ~3-4 mrad

MICE CM /10/ RAL20 beamline scaling for electrons (similar tables exist for p and pi, using excel tables) Optics: 0) Muon BL: P=208 MeV/c,  N = 7 mm rad “... the mother of all the beamlines “ 1)Proton BL: derived from (a)by rescaling magnet currents according to local momenta. P=440 MeV/c. Used since Apr for initial calibrations/set-up. W and WO decay solenoid (DS). 2) Pion BL: from (a), ditto (b). P=440/300 MeV/c. W and WO DS 3) Electron BL: from (a), ditto (b). P=330 MeV/c. W and WO DS. Used for PID calibrations. NB: many BLs for different flavours (p, ,  and e): needed for detector calibrations Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL21 Magnet Calibration Tables B(T)/g(Tm -1 )  I(A) Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL22 ZactualPout nameZbeamlengthmaterialrho (g/cm^3)Z-Dz/2Z+Dz/2P_initdE/dX TargetBox0420Vac TargetWindow2112SS airTransfer Air vacuumWindow Al vacuum Vac airTransfer Air vacuum Vac airTransfer Air vacuum Vac airTransfer Air vacuum Vac vacuumTransfer Vac vacuumWindow Al DecaySolenoid Vac vacuumWindow Al BeamMonitor Delrin Air center Scint Air Delrin GVA Scint airTransfer Air BeamCounter Delrin center208374Scint Delrin airTransfer Air GVA Scint BeamMonitor Delrin Air center210571Scint Air Delrin airTransfer Air TOF Scint CKOVa Delrin Aerogel Glass center Vac Air Glass Lexan CKOVb Delrin Aerogel Glass center Vac Air Glass Lexan airTransfer Air BeamCounter Delrin center Scint Delrin GVA Scint Material Budget Table+dE/dX Local Momenta at magnet entrances Current Re-scaling Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL23 Dx ~ 11 cm Dx ~ 5 cm Dx ~ 9 cm Dx ~ 4 cm Used transport with (444 MeV/c pions) [K. Tilley]: 0-%20optics/referencedecks&matching.htm CM Transport.FILE1.dat - all DECAY SOLENOID red - reduced DS (9/10) cyan The case of a 9/10 coil solenoid TPT calculation for  Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL24 Summary of available CODES TPT/TTL pros: a)fast and usable for quick evaluation b)a lot of previous work (KT + HN) c)nice “graphic” output cons: a)sort of black box with funny decks b)old documentation c)not so easy output d) magnet parametrisation? ICOOL it could be used to reproduce the BL pros: a)fast b)realistic: decay, material, single particle tracking c)easy output cons: a)start from nearly scratch b)apertures? (quadrupole hyperbolae etc) G4Beamline pros: a) highly realistic beam line basically set up easy to run nice output. cons: not easy to change intial conditions (e.g. target shape/orientation) few local users (myself  ) … need to fetch Tom (expert) for details G4MICE pros: highly realistic nice output all comprehensive code: from tgt to KL all the way through MICE allows matching easy to get in touch with local users/experts (malcolm, chris, mark, …) cons: readiness? magnet parametrisation? Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL25 system tested with air motors running main issues found: linear driving (cylindrical drum): needs precise stop ACTION encoder used to stop disc before reaching the bottom comment: 2 micro-switch will still be used for emergency only driving of the bayonet pin length between holding point of motor shaft and point of reaction force too long and holding area too small  the motor shaft bounce off the gear due to large shaft deflection ACTION: The motor/gear box holder has been re-designed to increase stiffness. carousel a) gear box used has NOT enough power to drive carousel whit a strongly unbalanced configuration b) motor shaft bent as in above case ACTION: worm wheel and gear with 65:1 ratio will be used to replace old design + new motor holder bracket re-designed to increase stiffness. response time / residue air in the air tube when the motors stop 1)3 m long pipe: overrun distance due to residual air = 0.02 mm 2)16 m “ “ : “ “ “ “ “ “ = 0.04/0.08 mm ACTION: mu-switch prior to end: 0.3 mm  mu-switches should be OK 3)back-pressure created when valve shuts before air exhausts ACTION: MD to design logic sequence to overcome problem magnetic effect on the air motors  ACTION replace the 3 air-motors with non-magnetic ones. Briggs Air motor contacted [15 days ago] and specs given  [P. Lau - Oxford] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL26 m.apollonioUKNF meeting - Trinity College, Oxford - 15/16 Sep the relay driver board design finished just before mechanical tests - manufacturing postponed to add possible modifications to design - tests indicate control logic to be modified - electronic crate some minor change - other CEG commitments  slow down the process - no definite date on completion available - contact with RAL experts for installation (electronic issues) [Mike Dawson - Oxford] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM /10/ RAL27 Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions beam line status: ∙ x500 less proton rate changed completely BL priorities: we need to produce/transport enough  ∙ optics: a)mainly available from main one with rescaling – need to check material budget for every specific case! b)caveat when matching with MICE optics ∙ beam characterisation (actual emittance) [e.g. emittance via TOFs, M.Rayner Analysis meeting] ∙ hw main issues [solenoid] future plans: ∙ ISIS beam simulation to tackle rate problem a)comparison with data b)change of tgt orientation (sim) ORBIT/G4xxx ∙PSI 9/10 optics  transmission study ∙alignment issues ∙optics matched with MICE summary