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beam line optics

beam line optics. M. Apollonio IC - London. layout. beam line status: estimated proton flux from measurements rates from GVA1/GVA2 analysis (reminder) optics availability sw availability future plans causes of reduced rate and actions AoB conclusions.

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beam line optics

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  1. beam line optics M. Apollonio IC - London UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  2. layout beam line status: • estimated proton flux from measurements • rates from GVA1/GVA2 analysis (reminder) • optics availability • sw availability future plans • causes of reduced rate and actions • AoB conclusions UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  3. Beam Features Beamline Target Optics Diffuser Beamline Status Conclusions • reminder on desired features • Pm = [140 MeV/c, 240 MeV/c], Dp = +/- 10% • easily tunable • matched emittance: • 1 mm rad < eN < 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 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  4. 1 2 3 4 Beam Features Beamline Production Optics Diffuser Beamline Status Conclusions p production/capture MICE: p – m decay beam line beam line constituted by 4 parts p decay m transport match to MICE UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  5. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions • 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] target working principle 1 ms 10 ms 20 ms UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  6. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions • 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 some key questions: UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  7. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions MICE beamline: magnet configuration and detector locations (march/april) ID1=400 A  PD1=480 MeV/c D1 Dp~30 MeV/c BM2:>29/3 IC2: >29/3 D2 BM1: >29/3 ID2=170 A  PD2=450 MeV/c GVA1: > 4/4 GVA2: > 29/3 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  8. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions • 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 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  9. 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 × 1011 protons per sec … i.e. per dip (at 1 Hz) is 2 V i.e. 2000 mV Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions 600 good μ/spill from 1.7 × 1012 protons

  10. Conclusions: Beam FeaturesBeamline Production Optics Diffuser Beamline Status 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)

  11. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions ISIS Beam m.apollonio UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008 11

  12. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions m.apollonio UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008 12

  13. Beam FeaturesBeamline Production Optics Diffuser Beamline Status Conclusions m.apollonio UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008 13

  14. Beam FeaturesBeamlineProduction Optics Diffuser Beamline Status Conclusions Comparing G4Beamline to DATA (june): see how well we understand the Q-poles count rates: G4beamline predictions vs measurements june 2nd june 3rd MC / meas: discrepancy x2 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  15. Beam FeaturesBeamlineProduction Optics Diffuser Beamline Status Conclusions Comparing G4Beamline to DATA (june) 306 72 r = 4.25 MC D=6.3% CASE1 DATA 2230 560 r = 3.98 2021 (x6.60) 833(x11.57) r = 2.42 CASE2 D=-29% 8159 (x3.65) 2603 (x4.66) r = 3.13 2016 (x6.60) 1297 (x18. / x1.56) r = 0.64 CASE3 D=11% 8945 (x4.01) 5077 (x9.07/ x1.95) r = 0.57 greatest effect, amplified by a long drift UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  16. Beam FeaturesBeamlineProduction Optics Diffuser Beamline Status Conclusions 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) uses a ??? model for B1-2 I assume it uses a “standard” model for quadrupoles with k2=g /Br UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  17. TEST: vary Q1-3 Leff to check possible systematics Question: can we be so wrong in determining Leff ? UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  18. Other reasons? a) efficiency of GVA1/GVA2? No we consider relative increase in count rate b) alignment? Less certain ... HOWEVER: bear in mind, a factor 2 while we miss ~ x500 so ... ... Pion production (i.e. Target dipping) is AN ISSUE for the Beam Line. This changes the way we have been considering it so far UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  19. Hi Marco Sorry for the late response but I have just returned from a week on leave. Peter has already filled you in on the mechanical "run on" tests we completed a week or so ago so I won't write anymore on that. The relay driver board design was finished just before we started the tests, but as there are still a few issues with the diffuser that may need some redesign I have put the manufacture of the board on hold until I know whether I need to make any additions to the design. The tests indicated that the control logic will need to be changed (if we don't add anymore solenoid valves to the air crate) so I will be working on this over the next few weeks, while the electronics crate will also need some minor changes. Both these tasks will be carried out between other CEG work commitments. I'm sorry I can't put a definite date on completion of this work at the moment. I have received several emails from RAL requesting answers to questions regarding the installation (electronics issues) so I will try to answer these as soon as possible. Cheers, Mike. • Hi Marco, • The device has currently tested with running the air motors. We found several problems with the design, some of them you may have known. • The linear driving of the carrier disc forwards and backwards along the cylindrical drum:- • We are now trying to use an encoder to govern the travelling of the carrier to prevent it hitting the bottom (it will jam there if it goes too far). The 2 micro-switch will still be used for emergency only • The driving of the bayonet pin:- • The length between holding point of motor shaft and the point of reaction force was too long and the holding area was too small that cause the motor shaft bouncing offs the gear due to large deflection on the shaft. • The motor/gear box holder has been re-designing to increase the stiffness.   • The driving of the carousel:- • The gear box used hasn’t got enough output power to drive the carousel when the heaviest lead disc was put on 1 holder leaving other holders empty. Also the motor shaft was bent due to the same phenomena as above stated in item 2. • The worm wheel and gear with 65:1 ratio will be used to replace the old design and also a new motor holder bracket has been re-designing to increase the stiffness. • For the response time / residue air in the air tube when the motors stop:- • It had also been tested that the 16 meter long air tube would affect the response time when the motors stops. With a short pipe ~ 3 meters, the overrun distance is about 0.02mm when the air stops. With 17 meter, the overrun distance is ~ 0.04 to 0.08 mm when the sir stops. • The micro-switch has 0.3 mm travelling distance before it reach its end. Therefore, the 2 micro switches will still be safe to place at the bottom of the cylindrical drum. • This is also found that the back pressure was created when the valve shuts before the air exhausts out. • Mike Dawson will design the logic sequence to ensure the residue air exhaust from the pipe before the valves shut. • The magnetic effect on the air motors:- • It is proved that the motors can be kaput when running under magnetic field. • We will replace all 3 motors by non-magnetised one and Mike Tacon had contacted the supplier Briggs Air motor last week to specify our requirement. • We are working in the positive direction to solve the above problems though there was some setback during tests. It’s not too bad as we discovered the problem earlier and all seems to have solutions. • You are welcome to give us advice on any tests that you think we may need to go through. • Regards, • Peter UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  20. Vert Pos is the DISTANCE FROM CL == Y

  21. UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  22. Muon Beam FeaturesBeamlineTarget Optics Diffuser State of Beamline Conclusion poptics Transport-Turtle optics design moptics [K. Tilley, MICE Beamline Review, IC 2007] UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  23. diffuser: - interface between beamline and MICE - lead thicknesses (T)  define eN x’ x = e3 =1.4 mm rad UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  24. Diffuser Plates Thicknesses in (e,P) space [MA, MICE Beamline Review, IC 2007] UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  25. Oxford University UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  26. p and e optics for calibration purposes • from m optics • currents rescaled according to local momenta e optics used for PID detectors calibrations tuned to ~100 MeV/c at TOF0 TOF0 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008 [K. Tilley]

  27. MICE beamline detector locations BM1: >29/3 GVA1: > 4/4 IC2: >29/3 BM2:>29/3 GVA2: > 29/3 TOF0+1 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  28. TOF0 TOF1 TOF0 + 1 [see M. Rayner’s talk] UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  29. Muon Beam FeaturesBeamlineTarget Optics Diffuser State of Beamline Conclusion Magnet PS cooling Magnet cooling PS current Polarity check Soak test Remote control commissioned MICE magnet status Q1  Q2  completeted Q3   D1  not completed Q1 D2  to be done Q4  Q2 Q5  Q6  Q3 Q7  Q8  Q9  D1 superconducting solenoid still not working [P. Kyberd’s talk] DS D2 Q4 Q5 Q6 Q7 Q8 Q9 UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  30. Muon Beam FeaturesBeamlineTarget Optics Diffuser State of Beamline Conclusion summary • all beam line magnets in place • 3 quadrupole-triplets, 2 dipoles, decay solenoid • all non-sc magnets working • first transported protons on March 29th • most of beam line detectors in place (DAQ exercised) • first analysis: • n. of protons low  how to increase it … • MC vs measured shows a x2 discrepancy • optics for p/p/m and e ready (w and w.o. sc-solenoid) • next steps • fix sc-decay solenoid • commission T2a & T2b • TOF1 installation  determine e (beam) • commission diffuser • collimators/correctors … UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  31. the end UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  32. Muon Beam Features Beamline Target Optics Diffuser State of Beamline Conclusion 1 p production/capture upstream beamline (in the synchrotron vault) • target Station: p on titanium blade  p + p high Pm  high Pp  small exit angle ~25o b) 1st Quadrupole Triplet Q1-Q2-Q3 first focussing: maximise acceptance before the decay solenoid c) 1st Dipole D1 first momentum selection: 60o bending B1 [select p]  B2 [select m] 60o UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  33. Muon Beam Features Beamline Target Optics Diffuser State of Beamline Conclusion 2 p decay channel  m Maximise number of muons in decay section: highest decay solenoid field 5 T consistent with controllable p beam profile. @ 25o UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  34. Muon Beam Features Beamline Target Optics Diffuser State of Beamline Conclusion 4 30o 3 m transport highest p momenta  allow selection of 'backward' going m for higher purity & higher fluxes. UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008 99 %

  35. Muon Beam Features Beamline Target Optics Diffuser State of Beamline Conclusion 4 match to MICE Q4-Q9 define the optics prior to the diffuser diffuser used to inflate initial emittance in a controlled fashion variety of final configurations and several momenta • Five thicknesses of Pb • Changeable via remote control UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

  36. D1 Q1-Q2-Q3 vacuum pipe target Muon Beam FeaturesBeamline Target Optics Diffuser State of Beamline Conclusion MICE beamline upstream section UKNF meeting - Trinity College, Oxford - 15/16 Sep 2008

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