MICE CM22 - 20/10/2008 - RAL 1

M. Apollonio IC - London

beam line optics

MICE CM22 - 20/10/2008 - RAL 2

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 CM22 - 20/10/2008 - RAL 3

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 CM22 - 20/10/2008 - RAL 4

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

MICE CM22 - 20/10/2008 - RAL 5

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 CM22 - 20/10/2008 - RAL 6

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 CM22 - 20/10/2008 - RAL 7

IC2: >29/3

BM1: >29/3

GVA1: > 4/4 GVA2: > 29/3

BM2:>29/3

MICE beamline: magnet configuration and detector locations (march/april)

D1

D2

D2 Current (Amps) V GVA2/GVA1

-50

0

50

100

150

200

250

300

350

-50 0 50 100 150 200 250

D2 Current

Cou

nts

in G

VA2

ID1=400 A PD1=480 MeV/c

ID2=170 A PD2=450 MeV/c

p~30 MeV/c

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 8

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

MICE CM22 - 20/10/2008 - RAL 9

[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 × 1011 protons per sec

• … i.e. per dip (at 1 Hz)

is 2 V

i.e. 2000 mVTime (ms) Energy (MeV) Sensitivity (V.s/proton) 0 70 2.2E-16 3 172 2.6E-16 5 374 4.3E-15 7 617 1.6E-14 9 780 3.5E-14 10 800 3.8E-14

600 good μ/spill from 1.7 × 1012 protons

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 10

[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 CM22 - 20/10/2008 - RAL 11

ISIS Beam

[A. Dobbs]

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 12

[A. Dobbs]

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 13

[A. Dobbs]

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 14

Q1 (T/m) Q2 Q3 Q4 Q5 Q6 n evts GVA1 GVA2 R1_MC R2_MC MC/m(1) MC/m(2) GVA1 GVA2 GVA1-BGVA2-B R1_m R2_m int_time1.0871 -1.99 1.22 0 0 0 5.20E+10 2021 833 6.60 11.57 1.82 na 11160 0 na na 3.64 na 100081.0871 0 0 0 0 0 5.20E+10 608 175 1.99 2.43 1.34 na 4535 0 na na 1.48 na 10008

0 -1.99 0 0 0 0 4.80E+10 287 88 1.02 1.32 1.89 na 1649 0 na na 0.54 na 99960 0 1.22 0 0 0 5.00E+10 480 148 1.63 2.14 1.53 na 3266 0 na na 1.07 na 99790 0 0 0 0 0 2.60E+10 153 36 1.00 1.00 1.00 na 3058 0 na na 1.00 na 9973

1.0871 -1.99 1.22 1.54 -2.05 1.36 5.20E+10 2016 1297 6.59 18.01 1.64 1.99 9111 5360 8945 5077 4.01 9.07 100211.0871 -1.99 1.22 1.54 0 0 5.20E+10 2027 774 6.62 10.75 1.64 2.13 9154 3106 8988 2823 4.03 5.04 100171.0871 -1.99 1.22 0 -2.05 0 5.20E+10 2027 414 6.62 5.75 1.83 2.08 8226 1830 8060 1547 3.62 2.76 100151.0871 -1.99 1.22 0 0 1.36 5.20E+10 2025 942 6.62 13.08 1.76 2.52 8552 3186 8386 2903 3.77 5.19 100111.0871 -1.99 1.22 1.54 -2.05 0 5.20E+10 2016 1110 6.59 15.42 1.78 2.00 8415 4605 8249 4322 3.70 7.72 100231.0871 -1.99 1.22 0 -2.05 1.36 5.20E+10 2014 589 6.58 8.18 1.73 2.17 8638 2395 8472 2112 3.80 3.77 100221.0871 -1.99 1.22 1.54 0 1.36 0.00E+00 0 0 na na na na 8329 2216 8163 1933 3.67 3.46 100091.0871 -1.99 1.22 0 0 0 5.20E+10 2021 833 6.60 11.57 1.80 2.48 8325 2886 8159 2603 3.66 4.66 10006

0 0 0 0 0 0 2.60E+10 153 36 1.00 1.00 1.00 1.00 2396 843 2230 560 1.00 1.00 10023GVA1 bkg GVA2bkg tbkg G4beamline predictions measurements

166 283 10017

jun

e 2

nd

jun

e 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 CM22 - 20/10/2008 - RAL 15

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

2016 (x6.60) 1297 (x18. / x1.56) GVA1/GVA2= 0.64

8945 (x4.01) 5077 (x9.07/ x1.95) GVA1/GVA2= 0.57

greatest effect, amplified by a long drift

CASE1

CASE2

CASE3

GVA1 GVA2

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 16

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

MICE CM22 - 20/10/2008 - RAL 17

TEST: vary Q1-3 Leff to check possible systematics

Leff (mm)

GVA1

(MC)

GVA2 (MC)

R1 [data] (GV1/306)

R2

(GV2/72)

-10% 1471 910 4.8 12.6

-5% 1746 1102 5.7 15.3

853.4 2016 1297 6.6

[4.0]

18.0

[9.1]

+5% 2352 1547 7.68 21.5

Question: can we be so wrong in determining Leff ?

[data]

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 18

1.76o

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 CM22 - 20/10/2008 - RAL 19

~15 mm~15 mm

~4 mm

to Q1

x y

zz

x

y

slight mis-alignmentshould not cause great change in rate

ISIS beam

coordinates in ISIS frame

25o

~3-4 mrad

MICE CM22 - 20/10/2008 - RAL 20

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 ofall the beamlines “

1) Proton BL: derived from(a) by rescaling magnetcurrents according to localmomenta. P=440 MeV/c. Usedsince Apr. 2008 for initialcalibrations/set-up. W and WOdecay solenoid (DS).

2) Pion BL: from (a), ditto (b).P=440/300 MeV/c. W and WODS

3) Electron BL: from (a), ditto(b). P=330 MeV/c. W and WODS. Used for PID calibrations.

NB: many BLs for different flavours (p, , and e):needed for detectorcalibrations

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 21

Magnet Calibration Tables B(T)/g(Tm-1)I(A)

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 22

Zactual Pout2000 127.8245

2996.7 127.82453000 127.8244

4396.7 127.1895000 126.6461

5796.7 126.55566000 126.45698000 125.9243

12164.7 125.035215000 121.380915800 120.082716000 119.758217000 118.135517760 116.902218000 116.540318820 115.464319000 115.228119980 113.942120000 113.915925290 76.8292626450 75.785227610 74.57979

name Zbeam length material rho (g/cm^3) Z-Dz/2 Z+Dz/2 P_init dE/dX

TargetBox 0 420Vac 0 0 210 147 0

TargetWindow 211 2SS304 7.874 210 212 147 11.59

airTransfer 225.575 27.15Air 0.00125 212 239.15 128.7478 5.5854

vacuumWindow 239.4 0.5Al 2.699 239.15 239.65 128.7289 6.7013

vacuum1 1391.15 2303Vac 0 239.65 2542.65 127.8245 0

airTransfer 2999.825 914.4Air 0.00125 2542.65 3457 127.8245 5.5605

vacuum2 3700 486Vac 0 3457 3943 127.189 0

airTransfer 4400 914Air 0.00125 3943 4857 127.189 5.5433

vacuum2 5100 486Vac 0 4857 5343 126.5556 0

airTransfer 5800 914Air 0.00125 5343 6257 126.5556 5.5262

vacuum3 7078.5 1643Vac 0 6257 7900 125.9243 0

vacuumTransfer 8309.875 819.8Vac 0 7900 8719.75 125.9243 0

vacuumWindow 8720 0.5Al 2.699 8719.75 8720.25 125.9243 6.5878

DecaySolenoid 12164.7 5138Vac 0 9595.7 14733.7 125.0352 0

vacuumWindow 14733.95 0.5Al 2.699 14733.7 14734.2 125.0352 6.5518

BeamMonitor1 14735.24 1.52Delrin 1.425 14734.5 14736 124.1511 4.9656

  14785.5 99Air 0.00125 14736 14835 123.0755 5.4322

center 14835.5 1Scint 1.032 14835 14836 123.0083 4.6295

  14885.5 99Air 0.00125 14836 14935 122.5305 5.4174

  14935.76 1.52Delrin 1.425 14935 14936.52 122.4635 4.923

GVA1 14990 10Scint 1.032 14985 14995 121.3971 4.5937

airTransfer 17911.5 5833Air 0.00125 14995 20828 116.6564 5.2586

BeamCounter2 20833.5 3Delrin 1.425 20832 20835 112.8222 4.6793

center 20837 4Scint 1.032 20835 20839 110.8218 4.3589

  20840.5 3Delrin 1.425 20839 20842 109.0224 4.5832

airTransfer 20846.75 16.5Air 0.00125 20838.5 20855 107.0631 4.9992

GVA2 20857 10Scint 1.032 20852 20862 107.0527 4.2753

BeamMonitor2 20956.74 1.52Delrin 1.425 20956 20957.5 102.6406 4.4219

  21007 99Air 0.00125 20957.5 21056.5 101.6828 4.8537

center 21057 1Scint 1.032 21056.5 21057.5 101.6228 4.1547

  21107 99Air 0.00125 21057.5 21156.5 101.194 4.8405

  21107.26 1.52Delrin 1.425 21106.5 21108.02 101.1341 4.3838

airTransfer 21144 70Air 0.00125 21109 21179 100.1846 4.8132

TOF0 21179 50.8Scint 1.032 21153.6 21204.4 100.1424 4.1219

CKOVa 21224.5 2Delrin 1.425 21223.5 21225.5 100.1424 4.3587

  21237 23Aerogel 0.2 21225.5 21248.5 98.9002 5.1403

  21250 3Glass 2.4 21248.5 21251.5 96.53564 5.2368

center 21251.5 0Vac 0 21251.5 21251.5 92.7651 0

  21427 351Air 0.00125 21251.5 21602.5 92.7651 4.6121

  21604 3Glass 2.4 21602.5 21605.5 92.56274 5.0866

  21606.5 2Lexan 1.2 21605.5 21607.5 88.90033 3.9133

CKOVb 21883.9 2Delrin 1.425 21882.9 21884.9 87.96111 4.0505

  21896.4 23Aerogel 0.2 21884.9 21907.9 86.80669 4.7295

  21909.4 3Glass 2.4 21907.9 21910.9 84.63109 4.7868

center 21910.9 0Vac 0 21910.9 21910.9 81.18453 0

  22086.4 351Air 0.00125 21910.9 22261.9 81.18453 4.2974

  22263.4 3Glass 2.4 22261.9 22264.9 80.99598 4.6494

  22265.9 2Lexan 1.2 22264.9 22266.9 77.64835 3.6498

airTransfer 25500 5350Air 0.00125 22825 28175 76.77238 4.177

BeamCounter3 28188.2 3Delrin 1.425 28186.7 28189.7 73.97896 3.6968

center 28191.7 4Scint 1.032 28189.7 28193.7 72.39855 3.5069

  28195.2 3Delrin 1.425 28193.7 28196.7 70.95085 3.6202

GVA3 28251.7 10Scint 1.032 28246.7 28256.7 69.40318 3.4404

Material Budget Table+dE/dX Local Momenta atmagnet entrances

Current Re-scaling

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 23

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%20-%20optics/referencedecks&matching.htmCM14-7.1-200 Transport.FILE1.dat

- all DECAY SOLENOID red- reduced DS (9/10) cyan

The case of a 9/10 coil solenoidTPT calculation for

Beam Features Beamline Production Optics Diffuser SW/HW issues Conclusions

MICE CM22 - 20/10/2008 - RAL 24

Summary of available CODES

TPT/TTLpros: a) fast and usable for quick evaluationb) a lot of previous work (KT + HN)c) nice “graphic” outputcons:a) sort of black box with funny decksb) old documentationc) not so easy outputd) magnet parametrisation?

ICOOL it could be used to reproduce the BLpros:a) fast b) realistic: decay, material, single particle trackingc) easy outputcons:a) start from nearly scratchb) apertures? (quadrupole hyperbolae etc)

G4Beamlinepros: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

G4MICEpros:• 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 CM22 - 20/10/2008 - RAL 25

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 onlydriving 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 stop1) 3 m long pipe: overrun distance due to residual air = 0.02 mm2) 16 m “ “ : “ “ “ “ “ “ = 0.04/0.08 mm ACTION: mu-switch prior to end: 0.3 mm mu-switches should be OK3) back-pressure created when valve shuts before air exhausts ACTION: MD to design logic sequence to overcome problemmagnetic 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 CM22 - 20/10/2008 - RAL 26m.apollonio UKNF meeting - Trinity College,

Oxford - 15/16 Sep 200826

- 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 CM22 - 20/10/2008 - RAL 27

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 problema) comparison with data

b) change of tgt orientation (sim) ORBIT/G4xxx ∙ PSI 9/10 optics transmission study∙ alignment issues∙ optics matched with MICE

summary