1 / 16

Beam line Optics

Beam line Optics. m. apollonio. 1. Q1. Q2. Q3. D1. Q4. Q5. Q6. Q7. Q8. Q9. D2. 2. beamline breakdown ( p,m ). Q1. Q2. Q3. Q4. Q5. Q6. Q7. Q8. Q9. Dipole1. Dipole2. DK solenoid. m. p. s x = 2.55 mm s y = 1.4 mm s x’= 0.33 rad s y’= 0.1 rad.

agalia
Download Presentation

Beam line Optics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Beamline Optics m. apollonio MICE CM24 - RAL 1

  2. Q1 Q2 Q3 D1 Q4 Q5 Q6 Q7 Q8 Q9 D2 MICE CM24 - RAL 2

  3. beamline breakdown (p,m) Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Dipole1 Dipole2 DK solenoid m p sx = 2.55 mm sy = 1.4 mm sx’= 0.33 rad sy’= 0.1 rad ex = 0.8415 mm rad ey = 0.1400 mm rad June 1st 2009 MICE CM24 - RAL 3 3

  4. BeamLine Completion: tuning for all (e,P) Also known as ... the MATRIX search for Q4-5-6 & Q7-8-9 currents to match optics at the u.s. face of the diffuser  fine tuning for every chosen e [3,6,10] mm rad (norm.) at every defined P = [140,200,240] (MeV/c)

  5. GA+Turtle Optimiser m INPUT: beamline US section >>>>>>>>> Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Dipole1 Dipole2 DK solenoid p OUTPUT: Twiss parameters @ diffuser US face (+TOF1) • GA procedure • Define 6-genes genotypes: Q4-5-6-7-8-9 currents • Express it as a phenotype: the Twiss parameters at some Z’s • Evaluate phenotype’s fitness • Mate genotypes and produce new individuals • Choose the best & repeat for several cycles MICE CM24 - RAL 5

  6. June 1st 2009 MICE CM24 - RAL 6 6

  7. b=78 cm a=0.2 cm T=3.0% b=132 cm a=0.4 cm T=3.5% June 1st 2009 MICE CM24 - RAL 7 7

  8. Pro’s and con’s of the method • running is fast (2.5 h for initial 70K muons after DKsolenoid) • preparing it a bit cumbersome (TTL…) • 3 decks (US / MID / DS) • I think of a change: • generate p m (G4BL) and record m after DKsolenoid • use THIS output as input for GA+TTL optimisation • NB In principle the GA algorithm should be able to run G4BL directly • It calls a script via a system call • possibility of tuning the solenoid • CAVEAT : • need to insert the spectrometer solenoid in the simulation (fringe field) • could take some time to have a working version June 1st 2009 MICE CM24 - RAL 8 8

  9. are we ready? • STEP I (shutdown 17 Aug/1 Sept) 2Sept – 25 Oct • depends on what we want to reach • - beam optics for a beam of 214 MeV/c before diffuser IS ready • - it can be easily scaled for other momenta • - a check of beam size at TOF1/ECAL should be sufficient to • assess it • - requires more work IF we need tuning (e.g. beta too big and • we need to re-define it) • STEP II (shutdown 17 Aug/1 Sept) 2Sept – 25 Oct • a bit more laborious • as before, optics exists for e=6,10 and P=214 MeV/c • HOWEVER, this has been tuned for a tracker solenoid present (fringe field) • re-defining it could require some work. We should try using it ‘just so’ • also, matrix has to be completed (hasn’t it to?) • this requires values for B at 140/240 [ B(140)=140/200 * B(200), while • B(240)=B(200) ] June 1st 2009 MICE CM24 - RAL 9 9

  10. Q7 Q8 Q9 Q7 Q8 Q9 Q7 Q8 Q9 are we ready? b STEP II.1 sXY (a) well defined problem know b in solenoid know b at US-diffuser b-line tuned (e=6,10 mm rad, P=214 MeV/c) STEP II.0 (b) NOT well defined problem b in solenoid ? b-line NOT tuned SUGGESTION: use case (a) tuning STEP I as case (b) but beam smaller at TOF2/KL due to less drift SUGGESTION: use case (a) tuning June 1st 2009 MICE CM24 - RAL 10 10

  11. 2) beamline quadrupole tuning 1) beamline momentum tuning m Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Dipole1 Dipole2 DK solenoid p fix D2 fix D1 Pp=444 MeV/c Pm=255 MeV/c Pm=214 MeV/c Pm=208 MeV/c June 1st 2009 MICE CM24 - RAL 11 11

  12. a level-0 optics for any P can be obtained by momentum rescling • then a Q4-5-6-7-8-9 tuning is required to match the line June 1st 2009 MICE CM24 - RAL 12 12

  13. 3 6 10 recalculated e=6mm rad, P=207 new tuning e=10 mm rad, P=207 investigate case e=3 mm rad P=207 (does not converge) PLAN: fix P=140/240 and cover the remaining empty elements 140 200 240 ??? June 1st 2009 MICE CM24 - RAL 13 13

  14. TPT/TTL used so far to define the optics • TPT: matrix transport through material • description decks a bit cumbersome • what if we need to re-define? • can we use something more? • flexible • understandable • capable of matching • MADX? Optics OPTIM June 1st 2009 MICE CM24 - RAL 14 14

  15. Optics G4BL @ Q1DS ex= 0.074 mm rad ey= 0.047 mm rad I ‘d like to cross check with Mark’s calculations on the same set of particles Why emittance grows here? June 1st 2009 MICE CM24 - RAL 15 15

  16. Summary • a central optics exists for (p,m) beamline with Pm~200 MeV/c • ande=6 mm rad • level-0 optics for Pm=140/240 can be generated by momentum • rescaling • a fine tuning of Q[4-9] can be done to match the optics to • US-diffuser values [STEPII.1] • - optics for STEPII.0/STEPI can be the one for STEPII.1 • so far DKsol is kept fixed (not tuned) • could be inserted in tuning if TTL  G4BL (but requires work) • codes other than TPT (MADX) could be used to improve optics • US of DKsol (ditto) June 1st 2009 MICE CM24 - RAL 16 16

More Related