1. MICE CM22 - 20/10/2008 - RAL1 M. Apollonio IC - London beam line optics

2. MICE CM22 - 20/10/2008 - 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

3. MICE CM22 - 20/10/2008 - 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

4. MICE CM22 - 20/10/2008 - RAL4 1 3 4 2  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

5. MICE CM22 - 20/10/2008 - 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

6. MICE CM22 - 20/10/2008 - 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

7. MICE CM22 - 20/10/2008 - 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

8. MICE CM22 - 20/10/2008 - RAL8 proton rate @ target 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

9. MICE CM22 - 20/10/2008 - 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 × 10 11 protons per sec … i.e. per dip (at 1 Hz) is 2 V i.e. 2000 mV 600 good μ/spill from 1.7 × 10 12 protons Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

10. MICE CM22 - 20/10/2008 - 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

11. MICE CM22 - 20/10/2008 - RAL11 ISIS Beam [A. Dobbs] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

12. MICE CM22 - 20/10/2008 - RAL12 [A. Dobbs] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

13. MICE CM22 - 20/10/2008 - RAL13 [A. Dobbs] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

14. MICE CM22 - 20/10/2008 - 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

15. MICE CM22 - 20/10/2008 - RAL15 Comparing G4Beamline to DATA (june) MC DATA 306 72 GVA1/GVA2= 4.25 2230 560 GVA1/GVA2= 3.98 2021 (x6.60) 833(x11.57) GVA1/GVA2= 2.42 8159 (x3.65) 2603 (x4.66) GVA1/GVA2= 3.13  6.3%  -29% 2016 (x6.60) 1297 (x18. / x1.56) GVA1/GVA2= 0.64 8945 (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

16. MICE CM22 - 20/10/2008 - RAL16 What do we know of Q1-3 ? magnet measurements: g (meas.) = 0.5168+/-0.0011 (u.s.) 0.5125+/-0.0012 (d.s.) Tm-1 @ 50 A g (specs) = 10 Tm-1 @ 1000A Leff(specs) = 853.4 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

17. MICE CM22 - 20/10/2008 - RAL17 TEST: vary Q1-3 Leff to check possible systematics Leff (mm) GVA1 (MC) GVA2 (MC) R1 [data] (GV1/306) R2 (GV2/72) -10%14719104.812.6 -5%174611025.715.3 853.4201612976.6 [4.0] 18.0 [9.1] +5%235215477.6821.5 Question: can we be so wrong in determining Leff ? [data] Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

18. MICE CM22 - 20/10/2008 - RAL18 1.76 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

19. MICE CM22 - 20/10/2008 - 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

20. MICE CM22 - 20/10/2008 - 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. 2008 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

21. MICE CM22 - 20/10/2008 - RAL21 Magnet Calibration Tables B(T)/g(Tm -1 )  I(A) Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

22. MICE CM22 - 20/10/2008 - RAL22 ZactualPout 2000127.8245 2996.7127.8245 3000127.8244 4396.7127.189 5000126.6461 5796.7126.5556 6000126.4569 8000125.9243 12164.7125.0352 15000121.3809 15800120.0827 16000119.7582 17000118.1355 17760116.9022 18000116.5403 18820115.4643 19000115.2281 19980113.9421 20000113.9159 2529076.82926 2645075.7852 2761074.57979 nameZbeamlengthmaterialrho (g/cm^3)Z-Dz/2Z+Dz/2P_initdE/dX TargetBox0420Vac002101470 TargetWindow2112SS3047.87421021214711.59 airTransfer225.57527.15Air0.00125212239.15128.74785.5854 vacuumWindow239.40.5Al2.699239.15239.65128.72896.7013 vacuum11391.152303Vac0239.652542.65127.82450 airTransfer2999.825914.4Air0.001252542.653457127.82455.5605 vacuum23700486Vac034573943127.1890 airTransfer4400914Air0.0012539434857127.1895.5433 vacuum25100486Vac048575343126.55560 airTransfer5800914Air0.0012553436257126.55565.5262 vacuum37078.51643Vac062577900125.92430 vacuumTransfer8309.875819.8Vac079008719.75125.92430 vacuumWindow87200.5Al2.6998719.758720.25125.92436.5878 DecaySolenoid12164.75138Vac09595.714733.7125.03520 vacuumWindow14733.950.5Al2.69914733.714734.2125.03526.5518 BeamMonitor114735.241.52Delrin1.42514734.514736124.15114.9656 14785.599Air0.001251473614835123.07555.4322 center14835.51Scint1.0321483514836123.00834.6295 14885.599Air0.001251483614935122.53055.4174 14935.761.52Delrin1.4251493514936.52122.46354.923 GVA11499010Scint1.0321498514995121.39714.5937 airTransfer17911.55833Air0.001251499520828116.65645.2586 BeamCounter220833.53Delrin1.4252083220835112.82224.6793 center208374Scint1.0322083520839110.82184.3589 20840.53Delrin1.4252083920842109.02244.5832 airTransfer20846.7516.5Air0.0012520838.520855107.06314.9992 GVA22085710Scint1.0322085220862107.05274.2753 BeamMonitor220956.741.52Delrin1.4252095620957.5102.64064.4219 2100799Air0.0012520957.521056.5101.68284.8537 center210571Scint1.03221056.521057.5101.62284.1547 2110799Air0.0012521057.521156.5101.1944.8405 21107.261.52Delrin1.42521106.521108.02101.13414.3838 airTransfer2114470Air0.001252110921179100.18464.8132 TOF02117950.8Scint1.03221153.621204.4100.14244.1219 CKOVa21224.52Delrin1.42521223.521225.5100.14244.3587 2123723Aerogel0.221225.521248.598.90025.1403 212503Glass2.421248.521251.596.535645.2368 center21251.50Vac021251.5 92.76510 21427351Air0.0012521251.521602.592.76514.6121 216043Glass2.421602.521605.592.562745.0866 21606.52Lexan1.221605.521607.588.900333.9133 CKOVb21883.92Delrin1.42521882.921884.987.961114.0505 21896.423Aerogel0.221884.921907.986.806694.7295 21909.43Glass2.421907.921910.984.631094.7868 center21910.90Vac021910.9 81.184530 22086.4351Air0.0012521910.922261.981.184534.2974 22263.43Glass2.422261.922264.980.995984.6494 22265.92Lexan1.222264.922266.977.648353.6498 airTransfer255005350Air0.00125228252817576.772384.177 BeamCounter328188.23Delrin1.42528186.728189.773.978963.6968 center28191.74Scint1.03228189.728193.772.398553.5069 28195.23Delrin1.42528193.728196.770.950853.6202 GVA328251.710Scint1.03228246.728256.769.403183.4404 Material Budget Table+dE/dX Local Momenta at magnet entrances Current Re-scaling Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

23. MICE CM22 - 20/10/2008 - RAL23 Dx ~ 11 cm Dx ~ 5 cm Dx ~ 9 cm Dx ~ 4 cm Used transport with (444 MeV/c pions) [K. Tilley]: http://www.isis.rl.ac.uk/accelerator/MICE/Task%20Notes%20and%20Specifications/beamline%2 0-%20optics/referencedecks&matching.htm CM14-7.1-200 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

24. MICE CM22 - 20/10/2008 - 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

25. MICE CM22 - 20/10/2008 - 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

26. MICE CM22 - 20/10/2008 - RAL26 m.apollonioUKNF meeting - Trinity College, Oxford - 15/16 Sep 2008 26 - 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

27. MICE CM22 - 20/10/2008 - 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