Beamline
Summaries & Action Items
MICE Collaboration Meeting, LBNL, Feb2005
Day
Talk
Wed 9th 1
Presenter
Topic
L. Howlett
Target Design Status
2
K. Walaron Beamline/Target Diagnostics
3
K. Tilley
Status of Muon Beamline design
4
P. Drumm
Beamline Engineering
1
Concern over Radiation levels
FIRST
assessment of
radiation levels.
Using FLUKA
code.
800MeV
protons,
10x10x1mm3
Ti target.
Flux at 1.4E12
MICE Target work (CB et al)
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
1.
2.
3.
4.
5.
6.
7.
Calculate and review target heating under 1.7x10^12 proton intersections. 1Hz/3Hz.
Investigate temperature monitoring schemes for target (thermocouple/IR/IR+modified target
topology)
Solve position sensing system irregularities
Update TRD with current FLUKA radiation level results
Continue to assess radiation level & effects on NdFeB / electronics
Setup ISIS engineer contact & determine acceptable in-vacuum materials etc.
Construct and test full prototype.
paul drumm, mutac jan 2003
12
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
Segmented BC-404
PMTs
XP2020 or
EM19954
Simulation: 10m from Target (20m also simulated)
Target Diagnostics (KW et al)
Summary
•
•
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.
Actions (KW et al)
1.
2.
3.
4.
5.
Establish if present PMTs are reliable, if not obtain & forward quote for new.
Submit experiment proposal to ISIS (PD)
Purchase equipment (scintillators…) and construct detectors
Source a suitable DAQ system.
(basis of a Question to Plenary audience)
Mount in position in synchrotron vault - Summer'05 shutdown.
paul drumm, mutac jan 2003
17
Target Diagnostics (KW et al)
Summary
•
•
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.
Actions (KW et al)
1.
2.
3.
4.
5.
Establish if present PMTs are reliable, if not obtain & forward quote for new.
Submit experiment proposal to ISIS (PD)
Purchase equipment (scintillators…) and construct detectors
Source a suitable DAQ system.*
(basis of a Question to Plenary audience)
Mount in position in synchrotron vault - Summer'05 shutdown.
"Audience Action"! :*.(Does any person know of an available DAQ system suitable for this experiment?)
paul drumm, mutac jan 2003
18
Status of Muon Beamline design work
• 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?
Kevin Tilley, RAL, 9th Feb
paul drumm, mutac jan 2003
19
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.
hence:μ+ central momentum in Tracker1 – design
206 MeV/c
μ+ central momentum in Tracker1 – achieved (g4bl)
183 MeV/c
+ exist probable further differences ie. MATCHING ('Good Muons'),
EMITTANCE etc between design goal & g4bl evaln.
paul drumm, mutac jan 2003
20
Deduction of correct 'Reference' Initial
Momenta's/Material Effects
(Thks to KW, using g4bl/g4)
Q
1
'
Q
2
'
Q
3
'
B
1
D
e
c
S
Arrive @ Muon
source momentum.
paul drumm, mutac jan 2003
Q
4
Q
5
Q
6
Q
7
Q
8
Q
9
E
C
S
S
Aimed @ 207.31
after 2x Tkr Planes,
for p-ref=200MeV/c
21
Hence…Ref set of Beamline Muon
Momentas & 
2
Element
Momentum Before (MeV/c)
TrackerPlanesX2
TrackerWindow
AIRDiffuser_trackerWindow
Diffuser
AIRTOF1_diffuser
TOF1
AirCkov1_TOF1
Ckov1
AirTOF0_Ckov1
TOF0
AIRprotAbs_TOF0
ProtAbs
AIRdecSolWin_ProtAbs
DecSolWinDS
paul drumm, mutac jan 2003
208.05
208.566
208.582
219.862
220.012
232.162
233.832
241.812
242.252
253.892
255.422
265.832
265.952
266.2
Momentum After (MeV/c) momDiff
207.31
208.05
208.566
208.582
219.862
220.012
232.162
233.832
241.812
242.252
253.892
255.422
265.832
265.952
0.74
0.516
0.016
11.28
0.15
12.15
1.67
7.98
0.44
11.64
1.53
10.41
0.12
0.248
g4 √θ2 (mrad)
5.97
8.12
0.71
86.68
2.59
24.76
11.47
23.60
3.95
22.11
6.72
18.98
1.82
3.82
22
Hence…Ref set of Beamline Muon
Momentas & 
2
Element
Momentum Before (MeV/c)
TrackerPlanesX2
TrackerWindow
AIRDiffuser_trackerWindow
Diffuser
AIRTOF1_diffuser
TOF1
AirCkov1_TOF1
Ckov1
AirTOF0_Ckov1
TOF0
AIRprotAbs_TOF0
ProtAbs
AIRdecSolWin_ProtAbs
DecSolWinDS
208.05
208.566
208.582
219.862
220.012
232.162
233.832
241.812
242.252
253.892
255.422
265.832
265.952
266.2
Momentum After (MeV/c) momDiff
207.31
208.05
208.566
208.582
219.862
220.012
232.162
233.832
241.812
242.252
253.892
255.422
265.832
265.952
0.74
0.516
0.016
11.28
0.15
12.15
1.67
7.98
0.44
11.64
1.53
10.41
0.12
0.248
g4 √θ2 (mrad)
5.97
8.12
0.71
86.68
2.59
24.76
11.47
23.60
3.95
22.11
6.72
18.98
1.82
3.82
…. pion channel in progress …
paul drumm, mutac jan 2003
23
TTL Model Fitting:- Example - 2" TOF0
Basic TTL model does not give same p-totout, or  2 ,so,
Fitted TTL model. Choose to prioritise fit to delta-p, vary density --> & find
density 0.892
INPUT:
p-tot
X'
OUTPUT:
ie. Now p-totout = 242.252MeV/c.
2
~ 16.9 mrad (cf. g4bl 22.1mrad)
√θ2TTL ~ 0.76.√θ2g4bl
paul drumm, mutac jan 2003
24
Hence…table of ready TTL/TPT
materials-fit data
Element
Momentum Before (MeV/c)
TrackerPlanesX2
TrackerWindow
AIRDiffuser_trackerWindow
Diffuser
AIRTOF1_diffuser
TOF1
AirCkov1_TOF1
Ckov1
AirTOF0_Ckov1
TOF0
AIRprotAbs_TOF0
ProtAbs
AIRdecSolWin_ProtAbs
DecSolWinDS
paul drumm, mutac jan 2003
220.012
232.162
233.832
241.812
242.252
253.892
255.422
265.832
265.952
266.2
Momentum After (MeV/c) momDiff
219.862
220.012
232.162
233.832
241.812
242.252
253.892
255.422
265.832
265.952
0.15
12.15
1.67
7.98
0.44
11.64
1.53
10.41
0.12
0.248
TTL/TPT √θ2 (mrad)
2.06
20.66
7.596
19.836
3.5
16.91
6.357
14.68
1.22
3.42
g4 √θ2 (mrad)
2.59
24.76
11.47
23.60
3.95
22.11
6.72
18.98
1.82
3.82
25
Illustration of some of the Muon
channel materials in TPT:Q
4
Q
5
Q
6
Q
7
Q
8
Q
9
Q
4
Q
5
Q
6
Q
7
T
O
F
0
paul drumm, mutac jan 2003
A
T
0
C
C
K
V
1
Q
8
Q
9
T
O
F
1
26
The Pb-position: Feasible? / Re-examine?
•
A scheme had been drawn for supporting the Pb. diffuser in its present position.
0.76cm Pb.
Geoffs plot /
Pb.
(Upstream) EndCoil
Q9 Body
Tracker.
Q9
Downstream
Mirror Plate
1.2245 m
•
We have a prescription, using a number of codes (G4MICE/BL & TPT/TTL) to
re-examine this position if necessary.
paul drumm, mutac jan 2003
27
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
28
Beamline design & evaluation
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 reexamining position exists (using G4MICE/BL & TPT/TTL) if so needed.
Actions
1.
2.
3
4
5.
6.
7.
Complete geant4 materials reference table. (KW)
Complete TTL fitting to materials (KT)
Complete MICE-note of above materials modelling work (KT/KW)
Produce new beamline design & evaluate (KT/KW)
Establish if present Pb-position feasible & proposed mounting (GB/PD/KT)
Evaluate impact of chromatic abberations / off-momentum matching (KT)
Re-examine beam matching under detector shielding environment (if time)
(KT/KW/…?)
paul drumm, mutac jan 2003
29
Beamline engineering talk
P. Drumm, RAL, 9th Feb
paul drumm, mutac jan 2003
30
Beamline Engineering
Discussion Items
•
Beamline vacuum system outlined:
–
–
•
Beamline magnet mounting & alignment
–
–
•
Quad Triplets aligned together, girder, away from beamline.
Mounting stands need to be designed
Radiation shielding concept:
–
–
–
•
ISIS Vacuum, Air-gap, Beamline Vacuum, Decay Solenoid Vacuum. UHV?
No vacuum system in Muon Channel (Air only, He?)
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
31
Beamline Engineering
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…)
Actions
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)
paul drumm, mutac jan 2003
32