1. PERLE@Orsay – Overview
Alex Bogacz
JLAB, Aug. 14, 2017

2. PERLE - Newly Proposed Test Facility
CDR
Alex Bogacz JLAB, Aug. 14, 2017

3. PERLE Downsizing CDR (900 MeV) ‘Lean’(400 MeV) Alessandra Valloni
Alex Bogacz
24 m
5.5 m
‘Lean’(400 MeV)
Alex Bogacz JLAB, Aug. 14, 2017

4. Overview PERLE@Orsay (400 MeV) - Layout
Compact footprint (24 m × 5.5 m × 0.8 m)
Multi-pass linac Optics in ER mode
Choice of symmetric ‘drift linac’ Optics: 3-pass ‘up’ + 3-pass ‘down’
Arc Optics Architecture
Isochronous Arcs with Flexible Momentum Compaction (FMC) Optics
Configured with two styles of 1.2 Tesla ‘curved bends’
Switchyard
Two-step, Vertical Spreaders/Recombiners with matching sections: Linacs-Arcs
‘First cut’ lattice design for
Magnet inventory (Dipoles and Quads )
Outlook – Future R&D
Alex Bogacz JLAB, Aug. 14, 2017

5. PERLE@Orsay - Layout 400 MeV 1 : 3 : 5 2 : 4 : 6 DE = 65.5 MeV 5.5 m
injector
5 MeV
DE = 65.5 MeV
2 : 4 : 6
5 MeV
dump
DC = lRF/2
Alex Bogacz JLAB, Aug. 14, 2017

6. Three passes ‘up’ + Three passes ‘down’
- Layout
400 MeV
1 : 3 : 5
24 m
0.8 m
5.5 m
DE = 65.5 MeV
injector
5 MeV
DE = 65.5 MeV
2 : 4 : 6
5 MeV
dump
DC = lRF/2
Three passes ‘up’ + Three passes ‘down’
Alex Bogacz JLAB, Aug. 14, 2017

7. - Site
Alex Bogacz JLAB, Aug. 14, 2017

8. PERLE@Orsay - Baseline Parameters
400 5
(300 pC)
(20-th sub harmonics)
Alex Bogacz JLAB, Aug. 14, 2017

9. 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 JLAB, Aug. 14, 2017

10. Cost-effective Magnet Solution
Alex Bogacz JLAB, Aug. 14, 2017

11. PERLE Magnet Design (dipoles and quads)

12. 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 = 17.5 MeV/m (16.4 MeV per cavity)
DE= 65.5 MeV per Cryo-module
93.5 cm
Alex Bogacz JLAB, Aug. 14, 2017

13. 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 JLAB, Aug. 14, 2017

14. 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 JLAB, Aug. 14, 2017

15. Arc 6 Optics – FMC Lattice 10 2 -2
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
399 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 = 1.2 Tesla
Alex Bogacz JLAB, Aug. 14, 2017

16. Arc 3 Optics – FMC Lattice 10 2 -2
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
202 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 = 1.2 Tesla
Alex Bogacz JLAB, Aug. 14, 2017

17. Switchyard - Vertical Separation of Arcs (1, 3, 5)
71 MeV
202 MeV
333 MeV
40 cm
Energies1 : 3 : 5
35 cm
20 cm
T. Michalski
Dipoles: (20 and 40 cm long)
B = 0.8 Tesla
Alex Bogacz JLAB, Aug. 14, 2017

18. Switchyard - Vertical Separation of Arcs (2, 4, 6)
40 cm
Energies1 : 2 : 3
25 cm
137 MeV
268 MeV
399 MeV
T. Michalski
Dipoles: (30 cm long)
B = 1.2 Tesla
Alex Bogacz JLAB, Aug. 14, 2017

19. Switchyard - Layout Energies1 : 3 : 5 T. Michalski Energies1 : 2 : 3
Alex Bogacz JLAB, Aug. 14, 2017

20. Vertical Spreaders - Optics
Spr. 1 (71 MeV)
Spr. 5 (333 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 JLAB, Aug. 14, 2017

21. Arc 1 Optics (71 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 JLAB, Aug. 14, 2017

22. Pass up + Pass down Pass-1 ‘up’ Pass-1 ‘down’ 5 MeV 71 MeV 137 MeV 20 2 -2
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
5 MeV
71 MeV
137 MeV
Pass-1 ‘down’
137 MeV 20 2 -2
BETA_X&Y[m]
DISP_X&Y[m]
BETA_X
BETA_Y
DISP_X
DISP_Y
71 MeV
5 MeV
Alex Bogacz JLAB, Aug. 14, 2017

23. Magnet Inventory

24. Outlook – R&D Program 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 JLAB, Aug. 14, 2017