Beam line summary

paul drummfor

beam line group

Beam optics status

• Design goals:

p

1 6 10

240 ~G4

200 TT

~G4

TT

G4

TT

~G4

140 ~G4

CM14-e-p tunes

Extrapolation

MeV

/c

Matching:Fixed & ScaledTracker fields

Collimation below 3-6

G4BL: 240 MeV/c scaled from 200 MeV/c givessame emittance and more tracks (x1.6)

- early results

TT: Transport & TurtleG4: G4Beam line

Comments

• Fringe fields and matching point not a good choice – Implies a retune of parameters for G4BL

• Implement a new cross over point 2do• In reality – varying (e.g) the last three

quads may be a faster tool than the present design tools

• Real time processing / automation– maximise by track info from (e.g.) three

tracker planes

Correction studies

• Beamline steering correction (DJA) - For muon transport section

– Studies already completed for CM14-1-200 and CM14-6-200 cases– Poss layout already proposed for downstream steering magnets. (1H, 2V)

– Studies supplemented by scenario for CM14-10-200 case:-

– New TS1 or TS2 correctors seem suitable (?)

+ 1

mm

pos

ition

, 0

ang

le H

,V C

ases

+ 1

mm

pos

ition

, 0

ang

le H

,V C

ases

1

2

3

Beam to diffuser

10 beam

Beam to diffuser

1

2

3

…careful look to optimise available area

Beam line optics summary

• Diffuser & metal work restricts to <3but >2.5• (maybe 2s at 140 MeV/c)• Diffuser size:

– needs to be larger to investigate the aperture– there is some room for adjustment in the

design• Collimation studies need to be more realistic

– Inform engineering design• Correction dipoles

– Baseline position needs more study

Beam line schedule….

Beam line geometry

T Target Sheffield

A Pion Capture ISIS

B Decay Solenoid

EID

C Muon Transport Channel

Liverpool?

D Diffuser Oxford

Beam line engineering

Comments

• 1st quad triplet engineering details close to completion– Next complete design of D1 stand and vac box

• Pushing Dipole 1 to saturation:– not absolutely necessary!– limitation partly due to solenoid aperture– parameter: magnet gap (6” is ok ) – but what is the optimum?

• Partly unmapped territory• Collimation

– Used perfect collimation so far– no real engineering design yet

• Steering magnets– Have a scheme

» needs further evaluation– Engineering solution available

• Need to update model with details of Ckov1 !

Review

– Stability of geometry?

• current design status

– Initial engineering

• Fixed: 1, 2, C/L D1

• Treat as modules: what is the risk?

– e.g. D2, T456, T789

– Process – transport – turtle – G4BL

– 1st pass?

Finally

• Bottleneck has been simulation– Transport Turtle loop (DA/KT)– outer G4BL simulation loop (TJR/KW)– Matching/emittance conditions (CR)

• Tom Roberts– welcome return to group

• Additional support– new position at Brunel now filled

• at least 50% on beam line