the MICE beam line status

the MICE beam line status a) RATE in MICE BL much lower (~500 x) than requested to do physicsb) The BL still need to be characterized:

a) Progress during summer shifts heardb) Other needed: e.g. what is the ACTUAL EMITTANCE of the beam?

c) Optics: 1. Muon BL: P=208 MeV/c, emi_N= 7 mm rad “ ... the mother of all the beamlines “

2. 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).

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

4. Electron BL: from (a), ditto (b). P=330 MeV/c. W and WO DS. Used for PID calibrations. NB: values currently used for the 1st triplet (from Logbook) are not the ones suggested in the Optics site. Has anyone a clue why?

5. NB1: many BLs for different flavours (p, , and e): needed for detector calibrations

d) A new WEB PAGE exists (with link to the old one) mice.iit.edu/bl e) Regular bi-weekly meetings (started on 3/10/2008)

To do list ...

c) TOF work (M. Rayner): use TOF stations as emittance measurement devices (Analysis-CM22, Tuesday) d) Customize beamline using local momenta [CAVEAT still work in progress]

http://www.isis.rl.ac.uk/accelerator/MICE/Task%20Notes%20and%20Specifications/beamline%20-%20optics/some_reference_data.htmGeneral Optics Scaling Spreadsheet for commissioning (MA/KT): Here:- Beamline Scaling

a) Low proton/pion rate in MICE. a) ISIS beam simulation (ORBIT, A.Dobbs: CM22 Sunday) and interaction with TGT signals on BLM7,8b) Is pion capture optimal ? In other words, is the first Q-pole focusing at the right position? c) Where is the tgt dipping ? dimensional survey available MICE Note 216 COMMENT: believe we will have to optimize our tgt dipping and negotiate with ISIS about beam losses. b) and c) can improve our rate(and possibly explain other discrepancies) but they will NOT “recover” a factor 500.

b) PSI solenoid sick! Last coil missing new optics sought. Which way (i.e. code?)a) TPT/TTL (more natural and fast to define the optics)b) G4MICE (I believe it is quite useful for a further hi-definition study)c) G4beamline (as above)d) Q.: check geometries vs dimensional survey

e) Conversion field/current: status in the MLCR ? f) A new web page is born ... Need to be filledg) Complete the (e,P) matrix: P=140/240 MeV/c, emi_N= 2,10 mm rad (*)

(*) essential for commissioning

Emi\P 140 (MeV/c) 200 240

2 (mm rad)

6

10

http://www.isis.rl.ac.uk/accelerator/MICE/Task%20Notes%20and%20Specifications/beamline%20-%20optics/some_reference_data.htm

ISIS-MICE TGT alignmentpurpose: understand sources of reduced ratecomment: probably a 2nd order effect

CAVEAT: result still preliminary, need a thorough checkPlease DON’T use them in your simulations !!!

3MICE Beam Line PC - 031008

486.05

CAVEAT: used old drawings Author: MJKCLRC 2006 Plus some info from Note 216


1.76o

Q4-point-1

Q4-point-6

Inclined_Frame_2

Inclined_Frame_1

Inclined_Frame_3


“nominal” target bottom tip

ISIS CLUsed 67.1-42.6=24.5

Where is the actual intersection of Q-pole axis with tgt plane?


Q1

Dip Verticaldepth position(mm) (mm)39.6 34.340.2 33.740.9 33.041.6 32.341.7 32.242.1 31.842.2 31.742.6 31.342.7 31.242.8 31.143.1 30.843.7 30.243.8 30.144.5 29.444.6 29.345.2 28.745.3 28.645.7 28.245.8 28.146.4 27.547.0 26.947.8 26.148.2 25.7

Vert Pos is the DISTANCE FROM CL == Y

TURTLE – a better look at the muon BL (just before D2 on)

After D1

In Q4

Q5?

Just before diffuser

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)

HorizontalHalf-width

(cm)

25

0

25

16mz

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

16mz

q4

q5

q6

q7

q8

q9

-25

-20

-15

-10

-5

0

5

10

15

20

25

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Diffuser

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

16mz

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

16mz

q4

q5

q6

q7

q8

q9

-25

-20

-15

-10

-5

0

5

10

15

20

25

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

16mz

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

B2

Q4

Q5

Q6

Q7

Q8

Q9

PbPT

B1B2 Q4 Q5 Q6 Q7 Q9Q8

Pb.Disk

Vertical Half-width

(cm)


(cm)

25

0

25

16mz

q4

q5

q6

q7

q8

q9

-25

-20

-15

-10

-5

0

5

10

15

20

25

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

DiffuserTurtle Simulation: KT BL design official doc

D2 entrance

Y (cm)

X (cm)

(b) 9/10 solenoid case – a snapshot with Transport

purpose: understand how the beam envelope changes when operating with a reduced solenoid == last coil silenced

comment: we may want to know it for future decisions

A finer assessment should rely on higher codes (G4XXX)


Dx ~ 11 cm

Dx ~ 5 cm

Dx ~ 9 cm

Dx ~ 4 cm

Used transport with (444 MeV/c pions):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

MICE Beam Line PC - 031008 16

This is Kevin Optics for 440 MeV/c protonsWITH NO SOLENOID

Clearly removing the last coil from the solenoid introduces a growthof the beta: 0+(s-s0)2/0 a linear growth in the envelope

However a solution for 440 MeV/c from production to Q6 exists whichProduces a decent result. I need to find the TPT deck and have some trials.

(d) an example of beamline re-scaling for electrons (similar tables exist for p and pi)(using smart excel tables)

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

X-1st TRIPLET (F0D0F)

Q1 D Q2 D Q30.78481 0.791259 1 0.5466 1.369864 0.956225 1 0.5466 0.835545 0.806084

-0.4854 0.78481 0 1 0.916653 1.369864 0 1 -0.37448 0.835545

Q3 Q2 Q1 Q3*D*Q2*D*Q1 Q3*D*Q2*D Q3*D*Q2 Q3*D-0.03154 4.793781 2.302125 3.787165 2.302125 2.528823 0.835545 1.262793

-0.21174 0.476846 0.065282 0.541775 0.065282 0.506092 -0.37448 0.630853DET DET DET DET

1 1 1 1F1 F2 F3

2.060175 -1.09093 2.670349

P0 (GeV/c) k1 L (m) k1L k2 L k2L k3 L k3L

0.444 0.783229 0.8534 0.668407 -0.97909 0.8534 -0.83556 0.681594 0.8534 0.581672g1 (Tm-1) g2 g3

1.1672 -1.45908 1.01574B rho (T)

1.490242

FOCAL DISTANCE Ltot Ltot/2 Q1-edge 4.722745 3.6534 1.8267 4.4

Y-1st TRIPLET (D0F0D)

Q1 D Q2 D Q31.231826 0.91838 1 0.5466 0.670766 0.757509 1 0.5466 1.173995 0.902344

0.563378 1.231826 0 1 -0.72616 0.670766 0 1 0.419203 1.173995

Q3*D*Q2*D*Q1 Q3*D*Q2*D Q3*D*Q2 Q3*D0.570607 1.840044 -0.33375 1.74258 -0.33375 1.925008 1.173995 1.54405-0.42677 0.376315 -0.73771 0.85549 -0.73771 1.258723 0.419203 1.403132

DET DET DET DET1 1 1 1

FOCAL DISTANCE -2.34319

thanks Ken for the kickstart ...

(f)

x

z

-578.5

35.42.6

~15.


y

z


“nominal” target bottom tip

ISIS CL 24.5

... here

3.046o

3.332o

256. ~15.


... a visual answer

CONCLUSIONS with a caveat

- from this preliminary study a misalignment is noticed which correspond to an angle of 0.286o : it is the angle by which the bottom tip of the target (at its lowest point) sees the entrance of Q1

- how important is this to pion collection at the 1st Q-pole? - my gut feeling says: not relevant- the real answer should rely on a MC simulation

- I used an old reference (1st survey by CCLRC) because I think I understand the drawings. Also partly used info from note 216, but I found it a bit more difficult to understand. So I want to have the latest figures and re-calculate the axis of the q-poles towards the target plane

- before launching yourself into simulations let me be convinced of the numbers


Documents

the MICE beam line status