1

Beamline

Day Talk Presenter Topic

Wed 9th 1 L. Howlett Target Design Status

2 K. Walaron Beamline/Target Diagnostics

3 K. Tilley Status of Muon Beamline design

4 P. Drumm Beamline Engineering

MICE Collaboration Meeting, LBNL, Feb2005

Summaries & Action Items

Concern over Radiation levels

FIRST assessment of radiation levels.

Using FLUKA code.

800MeV protons, 10x10x1mm3 Ti target.

Flux at 1.4E12

paul drumm, mutac jan 2003 12

MICE Target work (CB et al)

1. Calculate and review target heating under 1.7x10^12 proton intersections. 1Hz/3Hz.

2. Investigate temperature monitoring schemes for target (thermocouple/IR/IR+modified target topology)

3. Solve position sensing system irregularities

4. Update TRD with current FLUKA radiation level results

5. Continue to assess radiation level & effects on NdFeB / electronics

6. Setup ISIS engineer contact & determine acceptable in-vacuum materials etc.

7. Construct and test full prototype.

Summary• Pre-prototype has been constructed and tested. Experience gained in control electronics, mechanical

mounting & position readout very useful.• First full prototype expected at end of February.• Programme progressing according to Schedule. Problems however with radiation levels, heating &

vacuum conditions remain of concern. Involvement of ISIS engineers essential for tackling some of these.• Some modifications/design iterations expected after prototype constructed.

Actions

Beamline/Target Diagnostics

Kenny Walaron

University of Glasgow / RAL

Motivation

• Particle production from target = greatest unknown in experiment (& governs all rates, Good Muons etc)

• Measure proton interceptions / pion&muon production against & up to maximum permissible ISIS beamloss

Equipment & Position

• Segmented scintillator with double sided read-out to measure dE/dx placed inside ISIS ring

PMTs XP2020 or EM19954

Segmented BC-404

Simulation: 10m from Target (20m also simulated)

paul drumm, mutac jan 2003 17

Target Diagnostics (KW et al)

1. Establish if present PMTs are reliable, if not obtain & forward quote for new.

2. Submit experiment proposal to ISIS (PD)

3. Purchase equipment (scintillators…) and construct detectors

4. Source a suitable DAQ system. (basis of a Question to Plenary audience)

5. Mount in position in synchrotron vault - Summer'05 shutdown.

Actions (KW et al)

• Plan drawn up to quantify particle production from target, using dE/dx in scintillator devices.

• Using extension of g4beamline code - proton, (pion/muon) discrimination possible in theory. Actual PID discrimination subject to rates observed, ideas being pursued to handle these.

Summary

paul drumm, mutac jan 2003 18

Target Diagnostics (KW et al)

1. Establish if present PMTs are reliable, if not obtain & forward quote for new.

2. Submit experiment proposal to ISIS (PD)

3. Purchase equipment (scintillators…) and construct detectors

4. Source a suitable DAQ system.* (basis of a Question to Plenary audience)

5. Mount in position in synchrotron vault - Summer'05 shutdown.

Actions (KW et al)

• Plan drawn up to quantify particle production from target, using dE/dx in scintillator devices.

• Using extension of g4beamline code - proton, (pion/muon) discrimination possible in theory. Actual PID discrimination subject to rates observed, ideas being pursued to handle these.

Summary

"Audience Action"! :-*.(Does any person know of an available DAQ system suitable for this experiment?)

paul drumm, mutac jan 2003 19

Status of Muon Beamline design work

Kevin Tilley, RAL, 9th Feb

• Including Beamline Materials in new revision

• Reference ('true') momenta/materials effects (g4)

• Fitting TTL representations to 'true' g4 effects.

• Some inclusions in TPT/TTL design codes ….

• The Pb-diffuser position: feasible? / re-examination?

paul drumm, mutac jan 2003 20

Statement of Problem:SEPT04 & Beamline Materials

SEPT04 Beamline optics & initial momenta designed w/o taking into account effect of materials ie. Vacuum windows, PIDs etc, on beam.

μ+ central momentum in Tracker1 – design 206 MeV/c

μ+ central momentum in Tracker1 – achieved (g4bl) 183 MeV/c

hence:-

+ exist probable further differences ie. MATCHING ('Good Muons'), EMITTANCE etc between design goal & g4bl evaln.

paul drumm, mutac jan 2003 21

Deduction of correct 'Reference' Initial Momenta's/Material Effects

(Thks to KW, using g4bl/g4)

Aimed @ 207.31 after 2x Tkr Planes, for p-ref=200MeV/c

Q1'

Q2'

Q3'

B1

DecS

Q4

Q5

Q6

Q7

Q8

Q9

ECSS

Arrive @ Muon source momentum.

paul drumm, mutac jan 2003 22

Element Momentum Before (MeV/c) Momentum After (MeV/c) momDiff g4 √θ2 (mrad)

TrackerPlanesX2 208.05 207.31 0.74 5.97TrackerWindow 208.566 208.05 0.516 8.12AIRDiffuser_trackerWindow 208.582 208.566 0.016 0.71Diffuser 219.862 208.582 11.28 86.68AIRTOF1_diffuser 220.012 219.862 0.15 2.59TOF1 232.162 220.012 12.15 24.76AirCkov1_TOF1 233.832 232.162 1.67 11.47Ckov1 241.812 233.832 7.98 23.60AirTOF0_Ckov1 242.252 241.812 0.44 3.95TOF0 253.892 242.252 11.64 22.11AIRprotAbs_TOF0 255.422 253.892 1.53 6.72ProtAbs 265.832 255.422 10.41 18.98AIRdecSolWin_ProtAbs 265.952 265.832 0.12 1.82DecSolWinDS 266.2 265.952 0.248 3.82

Hence…Ref set of Beamline Muon Momentas & 2

paul drumm, mutac jan 2003 23

Element Momentum Before (MeV/c) Momentum After (MeV/c) momDiff g4 √θ2 (mrad)

TrackerPlanesX2 208.05 207.31 0.74 5.97TrackerWindow 208.566 208.05 0.516 8.12AIRDiffuser_trackerWindow 208.582 208.566 0.016 0.71Diffuser 219.862 208.582 11.28 86.68AIRTOF1_diffuser 220.012 219.862 0.15 2.59TOF1 232.162 220.012 12.15 24.76AirCkov1_TOF1 233.832 232.162 1.67 11.47Ckov1 241.812 233.832 7.98 23.60AirTOF0_Ckov1 242.252 241.812 0.44 3.95TOF0 253.892 242.252 11.64 22.11AIRprotAbs_TOF0 255.422 253.892 1.53 6.72ProtAbs 265.832 255.422 10.41 18.98AIRdecSolWin_ProtAbs 265.952 265.832 0.12 1.82DecSolWinDS 266.2 265.952 0.248 3.82

Hence…Ref set of Beamline Muon Momentas & 2

…. pion channel in progress …

paul drumm, mutac jan 2003 24

TTL Model Fitting:- Example - 2" TOF0

Fitted TTL model. Choose to prioritise fit to delta-p, vary density --> & find density 0.892

ie. Now p-totout = 242.252MeV/c. ~ 16.9 mrad (cf. g4bl 22.1mrad)2

INPUT:

OUTPUT:

p-tot X'

√θ2TTL ~ 0.76.√θ2

g4bl

Basic TTL model does not give same p-totout, or ,so,2

paul drumm, mutac jan 2003 25

Hence…table of ready TTL/TPT materials-fit data

Element Momentum Before (MeV/c) Momentum After (MeV/c) momDiff TTL/TPT √θ2 (mrad) g4 √θ2 (mrad)

TrackerPlanesX2TrackerWindowAIRDiffuser_trackerWindowDiffuserAIRTOF1_diffuser 220.012 219.862 0.15 2.06 2.59TOF1 232.162 220.012 12.15 20.66 24.76AirCkov1_TOF1 233.832 232.162 1.67 7.596 11.47Ckov1 241.812 233.832 7.98 19.836 23.60AirTOF0_Ckov1 242.252 241.812 0.44 3.5 3.95TOF0 253.892 242.252 11.64 16.91 22.11AIRprotAbs_TOF0 255.422 253.892 1.53 6.357 6.72ProtAbs 265.832 255.422 10.41 14.68 18.98AIRdecSolWin_ProtAbs 265.952 265.832 0.12 1.22 1.82DecSolWinDS 266.2 265.952 0.248 3.42 3.82

paul drumm, mutac jan 2003 26

Illustration of some of the Muon channel materials in TPT:-

Q4

Q5

Q6

Q7

Q8

Q9

TOF0

AT0C

CKV1

TOF1

Q4

Q5

Q6

Q7

Q8

Q9

paul drumm, mutac jan 2003 27

The Pb-position: Feasible? / Re-examine?

• A scheme had been drawn for supporting the Pb. diffuser in its present position.

Geoffs plot /

• We have a prescription, using a number of codes (G4MICE/BL & TPT/TTL) to re-examine this position if necessary.

0.76cm Pb.

1.2245 m

(Upstream) EndCoil

Pb.

Q9 Downstream Mirror Plate

Q9 Body

Tracker.

0.76cm Pb.

1.2245 m

(Upstream) EndCoil

Pb.

Q9 Downstream Mirror Plate

Q9 Body

Tracker.

paul drumm, mutac jan 2003 28

Re-examining the Pb-position: 'How-to'

• Can make crude re-est. again in TPT/TTL - checking matched εn for different d

• But to do properly, use G4MICE/G4BL as well as TPT/TTL :-

– New factors (since CERN CM: March'04) :-

• Better comprehension of εn !

• The presence of the upstream iron detector shield.

– The procedure:-

• Work backwards from matched εn=10π (or other max) beam with certain preferred Pb position 'p'. Also choose detector shield position as a variable 'd'? Use G4MICE/G4BL.

• Q: Can beamline supply this beam ? (Use TPT/TTL for quick answer)

• Re-run above test with different detector shield positions 'd' if needed.

• If beamline cannot supply beam, bring Pb position 'p' closer to solenoid & repeat until beamline can supply beam. Finish with the

paul drumm, mutac jan 2003 29

Beamline design & evaluation

1. Complete geant4 materials reference table. (KW)

2. Complete TTL fitting to materials (KT)

3 Complete MICE-note of above materials modelling work (KT/KW)

4 Produce new beamline design & evaluate (KT/KW)

5. Establish if present Pb-position feasible & proposed mounting (GB/PD/KT)

6. Evaluate impact of chromatic abberations / off-momentum matching (KT)

7. Re-examine beam matching under detector shielding environment (if time) (KT/KW/…?)

Actions

Summary • Progress made modelling beamline materials, and including first few into

TPT/TTL. Progress towards new revision however slower than hoped.• Mechanical support scheme for present Pb position available. Procedure for re-

examining position exists (using G4MICE/BL & TPT/TTL) if so needed.

paul drumm, mutac jan 2003 30

Beamline engineering talk

P. Drumm, RAL, 9th Feb

paul drumm, mutac jan 2003 31

Beamline Engineering

Discussion Items • Beamline vacuum system outlined:

– ISIS Vacuum, Air-gap, Beamline Vacuum, Decay Solenoid Vacuum. UHV?– No vacuum system in Muon Channel (Air only, He?)

• Beamline magnet mounting & alignment– Quad Triplets aligned together, girder, away from beamline.– Mounting stands need to be designed

• Radiation shielding concept:– Light concrete wall partitioning off entry area of beamline into MICE-Hall– Steel only in direct line of sight from MICE-Hall to synchrotron RF cavity. (protecting from fast neutrons)– Work ongoing with MCNPX

• Coordinate systems:– Number of coordinate system, potentially confusing (TPT system, MICE-centre)

paul drumm, mutac jan 2003 32

Beamline Engineering

Actions

Summary • Number of beamline engineering issues presented: vacuum system concept,

magnet mounting, hall radiation shielding (using MCNPX).• Point raised about existence of number of different (& therefore potentially

confusing?) coordinate systems. (TPT system, MICE-centre…)

1. Estimate physical space/mounting needed for beamline diagnostic devices (KW/KT)

2. Identify Target monitoring, controls & services needs. Determine physical location & possible commonalities eg. with other control equipment. (CB/PD)

3 Resolve radiation shielding needs (PD)

4. Provide TRD subsection explaining relation of TPT coordinate system to MICE coordinate system. (example=Pb position) (KT)

5. Ensure beamline engineering update at June Collaboration meeting (some topics = stands, alignment, target, cyro, quad-refurbishment…) (PD)