1 / 19

Alex Bogacz

Recirculating Linac Acceleration - End-to-end Simulation. Alex Bogacz. 0.9 GeV. 244 MeV. 146 m. 79 m. 0.6 GeV/pass. 3.6 GeV. 264 m. 12.6 GeV. 2 GeV/pass. Linac and RLAs - Goals. IDS Goals: Define beamlines /lattices for all components

pules
Télécharger la présentation

Alex Bogacz

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. Recirculating Linac Acceleration - End-to-end Simulation Alex Bogacz NuFact'09, Chicago, IL, July 24, 2009

  2. 0.9 GeV 244 MeV 146 m 79 m 0.6 GeV/pass 3.6 GeV 264 m 12.6 GeV 2 GeV/pass Linac and RLAs - Goals • IDS Goals: • Define beamlines/lattices for all components • Resolve physical interferences, beamline crossings etc • Error sensitivity analysis • End-to-end simulation (machine acceptance) • Component count and costing NuFact'09, Chicago, IL, July 24, 2009

  3. RLA Acceleration - Status • Presently completed lattices • Linear pre-accelerator – solenoid focusing • 4.5 pass Dogbone RLA × 2 (RLA I + RLA II) • Optimized multi-pass linac optics (bisected - quad profile along the linac) • Droplet return arcs (4) matched to the linacs • Transfer lines between the components – injection chicanes • Droplet arcs crossing – Double achromat Optics design • Chromatic corrections with sextupoles at Spr/Rec junctions • Error analysis for the Arc lattices (proof-or-principle) • Magnet misalignment tolerance – DIMAD Monte Carlo Simulation • Focusing errors tolerance – betatron mismatch sensitivity • Piece-wise end-to-end simulation with OptiM (pre-accelerator + RLA I) NuFact'09, Chicago, IL, July 24, 2009

  4. Linac-RLA Acceptance Initial phase-space after the cooling channel at 220 MeV/c bx,y = 2.74 m ax,y = -0.356 bg = 2.08 NuFact'09, Chicago, IL, July 24, 2009

  5. Linear Pre-accelerator – 244 MeV to 909 MeV Transverse acceptance (normalized): (2.5)2eN = 30 mm rad Longitudinal acceptance: (2.5)2 sDpsz/mmc= 150 mm 8 medium cryos 17 MV/m 6 short cryos 15 MV/m 11 long cryos 17 MV/m 2.4 Tesla solenoid 1.4 Tesla solenoid 1.1 Tesla solenoid NuFact'09, Chicago, IL, July 24, 2009

  6. ‘Soft-edge’ Solenoid • Non-zero aperture - correction due to the finite length of the edge : • It introduces axially symmetric edge focusing at each solenoid end: • Hard edge solenoid: NuFact'09, Chicago, IL, July 24, 2009

  7. ‘Soft-edge’ Solenoid – Nonlinear Effects • Nonlinear focusing term DF ~ O(r2) follows from the scalar potential: • Solenoid B-fields • Nonlinear focusing included in particle tracking NuFact'09, Chicago, IL, July 24, 2009

  8. Linear Pre-accelerator – 244 MeV to 909 MeV Transverse acceptance (normalized): (2.5)2eN = 30 mm rad Longitudinal acceptance: (2.5)2 sDpsz/mmc= 150 mm NuFact'09, Chicago, IL, July 24, 2009

  9. Multi-pass Linac Optics – Bisected Linac ‘half pass’ , 900-1200 MeV initial phase adv/cell 90 deg. scaling quads with energy quad gradient 1-pass, 1200-1800 MeV mirror symmetric quads in the linac quad gradient NuFact'09, Chicago, IL, July 24, 2009

  10. m- m- m+ m+ Injection/Extraction Chicane m+ m- NuFact'09, Chicago, IL, July 24, 2009

  11. Pre-accelerator–Chicane–Linac Matching a = 2×10-5 NuFact'09, Chicago, IL, July 24, 2009

  12. Pre-accelerator–Chicane–Linac Matching a = 2×10-5 NuFact'09, Chicago, IL, July 24, 2009

  13. Injection-to–Linac – Chromatic Corrections Dfxy = 1800 Dfxy = 1800 Dfxy = 1800 Dfxy = 1800 two families of sextupoles one family of sextupoles uncorrected NuFact'09, Chicago, IL, July 24, 2009

  14. Linac ½-to-Arc1 – Beta Match E =1.2 GeV • Already matched ‘by design’ • 900 phase adv/cell maintained across the ‘junction’ • No chromatic corrections needed NuFact'09, Chicago, IL, July 24, 2009

  15. Linac1-to-Arc2 – Chromatic Compensation E =1.8 GeV • ‘Matching quads’ are invoked • No 900 phase adv/cell maintained across the ‘junction’ • Chromatic corrections needed – two pairs of sextupoles NuFact'09, Chicago, IL, July 24, 2009

  16. Linac1-to-Arc2 - Chromatic Corrections initial uncorrected two families of sextupoles NuFact'09, Chicago, IL, July 24, 2009

  17. Mirror-symmetric ‘Droplet’ Arc – Optics (bout = bin and aout = -ain , matched to the linacs) E =1.2 GeV 2 cells out transition 2 cells out transition 10 cells in NuFact'09, Chicago, IL, July 24, 2009

  18. Longitudinal Compression in the RLA • Adiabatic compression in the RLA - off-crest acceleration in the linac + non zero momentum compaction in the arcs (M56~6 m) NuFact'09, Chicago, IL, July 24, 2009

  19. Summary • Presently completed Lattices: • Pre-accelerator (244 MeV-0.9) + injection double chicane • RLA I (0.9-3.6 GeV) and RLA II (3.6-12.6 GeV) • 4.5 pass linac • Droplet Arcs1-4 • Chromaticity correction with sextupoles validated via tracking • Piece-wise end-to-end simulation with OptiM (transport code) • Solenoid linac • Injection chicane • RLA I • Still to do… end-to-end simulation with fringe fields (sol. & rf cav.) NuFact'09, Chicago, IL, July 24, 2009

More Related