1. PERLE - Current Accelerator Design
Alex Bogacz
PERLE Mtg, May 26, 2017

2. Overview PERLE@Orsay (450 MeV) - Layout
Compact footprint (24 m × 5.5 m × 0.8 m)
Configured with to styles of 1.3 Tesla ‘curved bends’ proposed by Pierre Thonet
Multi-pass linac Optics in ER mode
Choice of linac Optics: 3-pass ‘up’ + 3-pass ‘down’
Arc Optics Architecture
Isochronous Arcs with Flexible Momentum Compaction (FMC) Optics
Switchyard
Vertical Spreaders/Recombiners with matching sections: Linacs-Arcs
‘First cut’ lattice design for
Two Linacs + Six Arcs
Magnet inventory (Dipoles and Quads )
Alex Bogacz PERLE Mtg, May 26, 2017

3. PERLE@Orsay - Layout 450 MeV 1 : 3 : 5 2 : 4 : 6 DE = 75 MeV 5.5 m
injector
5 MeV
DE = 75 MeV
2 : 4 : 6
5 MeV
dump
DC = lRF/2
Alex Bogacz PERLE Mtg, May 26, 2017

4. Three passes ‘up’ + Three passes ‘down’
- Layout
450 MeV
1 : 3 : 5
24 m
0.8 m
5.5 m
DE = 75 MeV
injector
5 MeV
DE = 75 MeV
2 : 4 : 6
5 MeV
dump
DC = lRF/2
Three passes ‘up’ + Three passes ‘down’
Alex Bogacz PERLE Mtg, May 26, 2017

5. Alternative Magnet Solution (Cost-effective)
Alex Bogacz PERLE Mtg, May 26, 2017

6. Alex Bogacz PERLE Mtg, May 26, 2017

7. Alex Bogacz PERLE Mtg, May 26, 2017

8. PERLE@Orsay - Layout Top view Side view 2 : 4 : 6 1 : 3 : 5
5.5 m
24 m
4 m
10 m
2 : 4 : 6
1 : 3 : 5
Side view
0.4 m m
Alex Bogacz PERLE Mtg, May 26, 2017

9. Cryo-module - Layout and Cavity Specs
SNS 805 MHz Cryo-module
8.491 m
MHz RF, 5-cell cavity:
l = cm
Lc = 5l/2 = cm
Grad = 20 MeV/m (18.7 MeV per cavity)
DE= 74.8 MeV per Cryo-module
93.5 cm
Alex Bogacz PERLE Mtg, May 26, 2017

10. Linac - Layout Linac length: 26 × lRF Re-injection chicane
8.491 m
9.72 10
BETA_X&Y[m]
BETA_X
BETA_Y
Cryo-module (8.491 m)
Re-injection chicane
Linac length: 26 × lRF
Alex Bogacz PERLE Mtg, May 26, 2017

11. Multi-pass ER Optics Acceleration Deceleration E6 E5 E4 E3 E2 E1 Einj 12
BETA_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y E6 E5 E4 E3 E2 E1
Einj
Acceleration 12
BETA_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
Einj E1 E2 E3 E4 E5 E6
Deceleration
Alex Bogacz PERLE Mtg, May 26, 2017

12. Arc 6 Optics – FMC Lattice 10 2 -2
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
453 MeV
4×450 bends
Qx,y = 1.25
triplet: Q1 Q2 Q3
singlet: Q4
triplet: Q3 Q2 Q1
Quadrupoles:
Q1 L[cm] =10 G[T/m] =
Q2 L[cm] =15 G[T/m] = 28.2
Q3 L[cm] =10 G[T/m] =
Q4 L[cm] =10 G[T/m] = 8.6
Dipoles: (91.2 cm long)
B = 1.3 Tesla
Alex Bogacz PERLE Mtg, May 26, 2017

13. Arc 3 Optics – FMC Lattice 10 2 -2
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
230 MeV
4×450 bends
Qx,y = 1.25
triplet: Q1 Q2 Q3
singlet: Q4
triplet: Q3 Q2 Q1
Quadrupoles:
Q1 L[cm] =10 G[T/m] =
Q2 L[cm] =15 G[T/m] = 13.1
Q3 L[cm] =10 G[T/m] = - 9.3
Q4 L[cm] =10 G[T/m] = 3.1
Dipoles: (45.6 cm long)
B = 1.3 Tesla
Alex Bogacz PERLE Mtg, May 26, 2017

14. Switchyard - Vertical Separation of Arcs (1, 3, 5)
80 MeV
230 MeV
379 MeV
40 cm
Energies1 : 3 : 5
35 cm
20 cm
Dipoles: (20 and 40 cm long)
B = 0.9 Tesla
Alex Bogacz PERLE Mtg, May 26, 2017

15. Switchyard - Vertical Separation of Arcs (2, 4, 6)
40 cm
Energies1 : 2 : 3
25 cm
155 MeV
304 MeV
453 MeV
Dipoles: (30 cm long)
B = 1.3 Tesla
Alex Bogacz PERLE Mtg, May 26, 2017

16. Vertical Spreaders - Optics
Spr. 1 (80 MeV)
Spr. 5 (379 MeV) 20 1 -1
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
4.023 20 1 -1
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
vertical step I
vertical step II
vertical chicane
Alex Bogacz PERLE Mtg, May 26, 2017

17. Arc 1 Optics (80 MeV) Isochronous Arc 2-step vert. Recombiner
15.71 20 2 -3
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
Isochronous Arc
pathlength: 42 × lRF
2-step vert. Spreader
2-step vert. Recombiner
1800 Arc
Spr. dipoles:
4 450 bends
L = 20 cm
B = 9.5 kGauss
Arc dipoles :
4450 bends
L = 45.6 cm
B = 4.5 kGauss
Rec. dipoles:
4 450 bends
L = 20 cm
B = 9.5 kGauss
quads: L = 10 cm G  1 kGauss/cm
Alex Bogacz PERLE Mtg, May 26, 2017

18. Magnet Inventory

19. Alex Bogacz PERLE Mtg, May 26, 2017

20. 114
100
150 28
Alex Bogacz PERLE Mtg, May 26, 2017

21. Summary PERLE@Orsay (450 MeV) Multi-pass linac Optics in ER mode
‘lean design’, fewer magnet varieties, 1.3 Tesla curved bends
Multi-pass linac Optics in ER mode
Linear lattice: 3-pass ‘up’ + 3-pass ‘down’
Arc Optics Choice
Flexible Momentum Compaction Optics
Complete Arc Architecture
Vertical switchyard
Matching sections: Linac-Switchyard-Arc
‘First cut’ linear lattice design
Two Linacs + Six Arcs
Magnet inventory
Dipole and Quad design (Pierre Thonet and Cynthia Vallerand)
Alex Bogacz PERLE Mtg, May 26, 2017

22. Summary PERLE@Orsay '10+2 pages summary’
1. Introduction - Max Klein- Liverpool Univ (0.5p)
2. Lattice and Optics - Alex Bogacz- JLAB (2p)
3. Infrastructure at Orsay, including remarks on beam extraction/experiments – Walid Kaabi- LAL (1p)
4. Gun and Injector – Boris Militsyn /Deepa Kalinin- STFC(1p)
5. Cavity – Bob Rimmer- JLAB (1p)
6. Cryomodule – Sébastien Bousson- IPNo (1p)
7. Magnets – Attilio Milanesi/Pierre-Alexandre Thonet- CERN (1p)
8. Dump - Oliver Bruning-CERN (from CDR) (0.5p)
9. Power equipment - Erk Jensen –CERN (1p)
10. Monitoring equipment - Walid Kaabi (1p)
11. Cryogenic equipment (IPNO?)
Alex Bogacz PERLE Mtg, May 26, 2017

23. Summary Appendix (2p) Configuration and Cost – Achille Stocchi
Table of Components with Basic parameters, numbers, cost and delivery status (input for that comes from the individual contributions, we shall know the nominal cost and the real cost, which is smaller due to in kind contributions)
Alex Bogacz PERLE Mtg, May 26, 2017

24. Summary Steps towards the TDR – Discussion - All
Liner lattice optimization Initial magnet specs
Momentum acceptance and longitudinal match
End-to-End simulation with synchrotron radiation, CSR micro-bunching (ELEGANT?)
Correction of nonlinear aberrations (geometric & chromatic) with multipole magnets (sext. octu.?)
RF cavity design, HOM content
BBU studies (TDBBU?)
Injection line/chicane design
Space-charge studies at injection
Diagnostics & Instrumentation
Multi-particle tracking studies of halo formation
Final magnet specs
Engineering design
Alex Bogacz PERLE Mtg, May 26, 2017