Paul drumm, mutac jan 2003 1 1 K. Tilley, MICE-VC, 10/05/07 Status of Beamline Design / Commissioning MICE-VC.
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paul drumm, mutac jan 2003 1
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K. Tilley, MICE-VC, 10/05/07
Status of Beamline Design / Commissioning
MICE-VC
paul drumm, mutac jan 2003 2
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Establish fully trustworthy model of the beamline (G4BL/Ttl comp) (KW/fraction of KT) :-> end of May
Specification of needs (jig support) / risk assessments for magnet field tests. (KT?/&ideally find an individual: ~ May ~ 1week… & confirm a workshop ! ie: (ISISEng?/WL?/FF?))
Planning of beamline commissioning (Everyone) May -> end of July
CM18 June13-16
Completion of (6pi,200MeV/c) design (DH?/KT/HN?) June1 -> July5 - CM18 ~4wks(Spare time, if any, for other cases / steering magnet / collimation schemes * ) else June 18-July5 ~3wks only.
Formal Beamline Design & Commissioning Review (KT/HN/(DH?/TJR?)/Engineer?) July 4/5?
Magnet field test measurements (KT?/ISISEng?/HN?) July min2weeks
Beamline commissioning (KT/HN/everyone) Autumn
* Layout frozen (Magnets, PIDs etc)
Plan
Status of Beamline Design
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• Some additional comments received re: Response to BL review.
Aim to include & get response to PD/Tech Board next week. To reviewers 25th?
Design
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Efforts to establish a trustworthy model of the Beamline (i)
Design
… Downstream lattice::
-20
-15
-10
-5
0
5
10
15
20
0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 16.000
TTL Y rms
G4BL Yrms
TTL X rms
G4BL Xrms
Diffuserdownstream edge
Q9Q8Q7Q6Q5Q4B2 TOF0
Čerenkov
TOF1
-20
-15
-10
-5
0
5
10
15
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0 2 4 6 8 10 12 14 16
G4BL Yrms
G4BL Xrms
TTL AirScatt Y rms
TTL AirScatt X rms
G4BL No FF Xrms
G4BL No FF Yrms
Diffuserdownstream edge
Q9Q8Q7Q6Q5Q4B2 TOF0
Čerenkov
TOF1
List of possible causes
Pre-CM17 case
Input Decks (found a couple of "small?" differences d/stream)
(maybe a couple fo "larger" differences u/stream)
Differing input beams to muon transport (due to above or modelling accuracy)
Basic code arithmetic?
Dipole / quadrupole fringe field modelling in G4BL/Ttl
:- note we have dipole/quad field maps avail to "referee"
Outliers / large scatters dominating the rms beamsize in G4BL
(cuts are made in Turtle)
Difference in materials modelling / in(ex)clusion of Air/PID scattering
Other
Current
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Efforts to establish a trustworthy model of the Beamline (ii)
Design
Strategy: - to aid cleaner interpretation
rather than : switching off individual effects … -> switch off all : as @ moment.,
instead: switch off all … -> then switch on individual effects.
(Checks basic lattice & cleaner interpretation)
for downstream section (currently) / then upstream (next) :-
:- sort the input decks for agreement.
:- take same pencil/small beam through both codes
:- confirm basic optics ok
:- add fringe fields (current/other)
:- add PIDs
:- make same particle cuts
:- add Diffuser
:- make same particle cuts
:- add Air:- make same particle cuts
once differences fixed: could take normal large beam through codes
:- confirm codes give agreement in section under study
Needs focussed code/processing time. Have ~2.5weeks to milestone. Mainly KW/fraction of KT. Do need others actively involved.
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• Albeit code comparison ongoing –
- techniques being exercised to produce (6,200) in G4BL- being undertaken by Dazhang Huang (IIT) & Tom (MuonsInc)
Optimisation
Design
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Pre-commissioning: Magnet tests
Commissioning
x0 x0
Geometric centrePole tip radius
x0 x0
Geometric centrePole tip radius
important measurements:
polarities of magnets
current to field relationship
magnetic alignment: need simple tools to check field centres;
Standardisation procedure?
ideal measurements:
field quality/uniformity
effective length
- Decay solenoid?
- Extensive discussion on dipole/quad magnet tests/method
- Outline above needs-> new doc? (KT)
- Need to identify individual now. to help drive this through (jig design/kit &/or measurements) requires 3xjigs & kit for July measurements.- Need to confirm workshop now to produce eqpt. FOR July. (possibly ISIS w/shop / but…?)
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Online prePhase1 beam commissioning planning:
Commissioning
- At time of writing we (BL group) have made ~ 2 separate, incomplete run plans.- + initial discussions with RIKEN people re: commissioning RIKEN/ISIS beamline
-Forward planning has been insufficient attention.
-Intention to begin deeper focussed discussions this week (Friday 11 th May 10:30 BST): all welcome
-Hope to have at least outline, complete plans for discussion at CM18 by MICE.
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Basic beam monitors:
Commissioning
- Already established need 2x detectors- Applications: Upstream: Beam present / flux
Beam size / centre (esp. vertically)BBA still being discussed
Downstream: Beam present / fluxBeam size / centre (mainly for gross errors) BBA still being discussed
- Specifications: Upstream: Size ~20x20cm suitable : Resolution ~ 6mm ok for flux/ctr/size (1mm if BBA). Build with 1mm’s : Rates: order of magnitude estimate for nominal case ~10^9Hz inst : Fields: given
Downstream: Size ~ 44.8x44.8cm suitable : Resolution ~1.4cm ok for flux/ctr/size (1mm if BBA). Build with 1mm’s
: Rates: order of magnitude estimate for nominal case. ~10^8Hz inst : Fields: given
Final readout solutions for both monitors in development.
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Establish fully trustworthy model of the beamline (G4BL/Ttl comp) (KW/fraction of KT) :-> end of May
Specification of needs (jig support) / risk assessments for magnet field tests. (KT?/&ideally find an individual: ~ May ~ 1week… & confirm a workshop ! ie: (ISISEng?/WL?/FF?))
Planning of beamline commissioning (Everyone) May -> end of July
CM18 June13-16
Completion of (6pi,200MeV/c) design (DH?/KT/HN?) June1 -> July5 - CM18 ~4wks(Spare time, if any, for other cases / steering magnet / collimation schemes * ) else June 18-July5 ~3wks only.
Formal Beamline Design & Commissioning Review (KT/HN/(DH?/TJR?)/Engineer?) July 4/5?
Magnet field test measurements (KT?/ISISEng?/HN?) July min2weeks
Beamline commissioning (KT/HN/everyone) Autumn
* Layout frozen (Magnets, PIDs etc)
Plan + progress along these items…
Status of Beamline Design
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Basic Beamline monitors
Supplementary re: detectors
Specification / applications
Upstream
Main home
Poss v. temp locations (fault finding/startup?)
Measure at Nominal pos:
Beam PresentBeam FluxAverage y centre/size
Speculative within Quads (fault finding) Beam Present/flux u/str
No concensus yet on BBA. Difficult here. (-> a later detector if rqd?)
Size: 20x20cm good(beamsize Y<=12cm @ nom posn)
Fields:max 130Gauss vertically
Rate estimate (TJRcm7): (mostly protons). Nominal target dip, assumptions etc -> ~ 1x10^6/ms (believed spread evenly over whole 15.2x112cm area)
Upstream:
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Basic Beamline monitors
Specification / applications
Downstream Main home Commissioning / fault
finding locations Measurements:
Beam PresentBeam FluxGross errors in position etc
No concensus yet on BBA. (-> a later detector if rqd?)
Size: 44.8x44.8cm good(mostly covers Q35 aps)
Fields:max 190Gauss vertically(if Decay Sol<->B2)
Rate estimates: - see next slides`
Supplementary re: detectors
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Commissioning / fault finding locations
Basic Beamline monitors
Specification / applications
Downstream
Main home
Rates: Estimated based on G4BL TOF0 CM14-6-200 Rate (3.22MHz): - which usesnormal target insertion, production & normalisation assumptions………..
Then using Turtle pion+muon local fluxes & scaling 3.22MHz appropriately.
Note the figure is for beam over all area. If a second (lower) figure given – this is implies the rate for the smaller 44.8x44.8cm is as given & is lower.
After C2H4 (protons removed): pi+mu ~ 121MHz
b4Q4 : pi+mu ~ 116MHz(~115MHz 44.8x44.8cm)
b4Q5 : pi+mu ~ 5.6MHz
b4Q6: pi+mu ~ 3.8MHz
b4t0: pi+mu ~ 3.22MHz
b4q7: pi+mu ~ 3.18MHz(~3.16MHz 44.8x44.8cm)
b4q8: pi+mu ~ 2.0MHz
b4q9: pi+mu ~ 1.78MHz
@MICE: pi+mu ~ 1.69 MHz
Before C2H4 (protons included): pi+mu ~ 1212MHz
Supplementary re: detectors: d/str rate ests
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