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

paul drumm, mutac jan 2003 4

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Efforts to establish a trustworthy model of the Beamline (i)

Design

… Downstream lattice::

-20

-15

-10

-5

0

5

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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

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-10

-5

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5

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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

paul drumm, mutac jan 2003 7

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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…?)

paul drumm, mutac jan 2003 8

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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.

paul drumm, mutac jan 2003 10

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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

paul drumm, mutac jan 2003 11

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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:

paul drumm, mutac jan 2003 12

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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