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Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab,

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Presentation on theme: "Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab,"— Presentation transcript:

1 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Alex Bogacz Linacs and RLAs for the IDS Baseline

2 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Acceleration Scenario – IDS Baseline Linear Pre-accelerator (244 MeV to 900 MeV) RLA I  4.5 pass, 0.6 GeV/pass, (0.9 GeV to 3.6 GeV ) RLA II  4.5 pass, 2 GeV/pass (3.6 GeV to 12.6 GeV ) Non scaling FFAG (12.6 GeV to 25 GeV )

3 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Acceleration Scheme – IDS Goals Engineering design foundation Define beamlines/lattices for all components Design lattices for transfer lines between the components Resolve physical interferences, beamline crossings etc  Floor Coordinates Carry out end-to-end tracking study  Machine Acceptance Engineer individual active elements (magnets and RF cryo modules)

4 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 RLA requirements Simultaneous acceleration of both  +  - species Manageable orbit separation at recirculation arcs Large transverse and longitudinal acceptances Beam dynamics challenges  RLA Optics solutions Phase slippage in the linacs Multi-pass linac optics Orbit separation – linac ends Droplet return arc – compact lattice design Chromatic corrections ‘Dogbone’ RLA with FODO Focusing

5 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 0.6 GeV/pass 3.6 GeV 0.9 GeV 244 MeV 146 m 79 m 2 GeV/pass 264 m 12.6 GeV Towards Engineering Design Foundation

6 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Initial beam emittance after the cooling at 220 MeV/c ISS/IDS  rms A = (2.5) 2  normalized emittance:  x /  y mm  rad 4.830 longitudinal emittance:  l  l   p  z /m  c) momentum spread:   p/p bunch length:  z mm 27 0.07 176 150  0.17  442

7 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linear Pre-accelerator – 244 MeV to 909 MeV 6 short cryos 15 MV/m 8 medium cryos 17 MV/m 11 long cryos 17 MV/m 1.1 Tesla solenoid 1.4 Tesla solenoid 2.4 Tesla solenoid

8 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linear Pre-accelerator – 244 MeV to 909 MeV 6 short cryos 15 MV/m 8 medium cryos 17 MV/m 11 long cryos 17 MV/m 1.1 Tesla solenoid 1.4 Tesla solenoid 2.4 Tesla solenoid Transverse acceptance (normalized): (2.5) 2   = 30 mm rad Longitudinal acceptance: (2.5) 2   p  z /m  c  = 150 mm

9 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Introduction of synchrotron motion in the linac Longitudinal acceptance:  p/p=  0.17 or  =  93 (200MHz)

10 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 ‘hard-edge’ solenoid Zero aperture solenoid - ideal linear solenoid transfer matrix:

11 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 ‘soft-edge’ solenoid – edge effect Non-zero aperture - correction due to the finite length of the edge : It decreases the solenoid total focusing – via the effective length of: It introduces axially symmetric edge focusing at each solenoid end: axially symmetric quadrupole

12 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Pre-accelerator Optics – soft vs hard solenoids a = 19.5 cm a = 15 cm a = 0 cm

13 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 ‘soft-edge’ solenoid – nonlinear effects Nonlinear focusing term  F ~ O(r 2 ) follows from the scalar potential: Scalar potential in a solenoid Solenoid B-fields

14 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 ‘soft-edge’ solenoid – nonlinear effects In tracking simulations the first nonlinear focusing term,  F ~ O(r 2 ) is also included: Nonliner focusing at r = 20 cm for 1 m long solenoid with 25 cm aperture radius

15 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linear Pre-accelerator – 244 MeV to 909 MeV Transverse acceptance (normalized): (2.5) 2   = 30 mm rad Longitudinal acceptance: (2.5) 2   p  z /m  c  = 150 mm

16 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Injection double-chicane      

17 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Pre-accelerator–Chicane–Linac Matching  = 2×10 -5

18 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Pre-accelerator–Chicane–Linac Matching  = 2×10 -5

19 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Injection-to–Linac – Chromatic Corrections uncorrected one family of sextupoles two families of sextupoles

20 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linac½ – Longitudinal Dynamics 6 cells

21 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 FODO - ‘flat focusing' linac profile 1-pass, 1290-1800 MeV ‘half pass’, 900-1200 MeV initial phase adv/cell 90 deg – fixed gradient in all cells (no scaling with energy) phase adv. diminish uniformly in both planes

22 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 FODO - ‘flat focusing' linac profile 2-pass, 1800-2400 MeV 3-pass, 2400-3000 MeV phase adv. diminish uniformly in both planes

23 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 FODO - ‘flat focusing' linac profile 4-pass, 3000-3600 MeV phase adv. still larger then 180 deg. in both planes

24 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Mirror-symmetric ‘Droplet’ Arc – Optics 10 cells in 2 cells out (  out =  in and  out = -  in, matched to the linacs) Arc dipoles $Lb=100 cm $B=10.5 kG Arc quadrupoles $Lb=50 cm $G= 0.4 kG/cm transition phase adv./cell  x,y = 90 0 E =1.2 GeV

25 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 ‘Droplet’ Arcs scaling – RLA I i = 1…4E i [GeV]p i /p 1 cell_outcell_inlength [m] Arc11.21 2×22×2 10130 Arc21.83/2 2×32×3 15172 Arc32.42 2×42×4 20214 Arc43.05/22×52×525256 Fixed dipole field: B i =10.5 kGauss Quadrupole strength scaled with momentum: G i = × 0.4 kGauss/cm Arc circumference increases by: (1+1+5) × 6 m = 42 m

26 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Mirror-symmetric ‘Droplet’ Arc – Optics Arc1 (E =1.2 GeV) 2 cells out 10 cells in 2 cells out 3 cells out 15 cells in 3 cells out Arc2 (E =1.8 GeV)

27 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Mirror-symmetric ‘Droplet’ Arc – Optics Arc3 (E =2.4 GeV) 4 cells out 20 cells in 4 cells out 5 cells out 25 cells in 5 cells out Arc4 (E =3.0 GeV)

28 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linac ½-to-Arc1 – Beta Match E =1.2 GeV Already matched ‘by design’ 90 0 phase adv/cell maintained across the ‘junction’ No chromatic corrections needed

29 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linac1-to-Arc2 – Beta Match E =1.8 GeV Noticeable mis-match at the end of Linac1 ‘Matching quads’ are invoked

30 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linac1-to-Arc2 – Beta Match E =1.8 GeV No 90 0 phase adv/cell maintained across the ‘junction’ Chromatic corrections needed

31 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linac1-to-Arc2 – Chromatic compensation E =1.8 GeV Chromatic corrections with two pairs of sextupoles

32 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Linac1-to-Arc2 - Chromatic Corrections initial uncorrected two families of sextupoles

33 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 ‘Droplet’ Arcs scaling – RLA II i = 1…4E i [GeV]p i /p 1 cell_outcell_inlength [m] Arc14.61 2×22×2 10260 Arc26.63/2 2×32×3 15344 Arc38.62 2×42×4 20428 Arc410.65/22×52×525512 Fixed dipole field: B i = 40.3 kGauss Quadrupole strength scaled with momentum: G i = × 1.5 kGauss/cm Arc circumference increases by: (1+1+5) × 12 m = 84 m

34 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Arcs ‘Crossing’ - Vertical Bypass  

35 Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz IDS- NF Acceleration Meeting, Jefferson Lab, Dec. 14-15, 2008 Summary IDS Goals – laying engineering design foundation Define beamlines/lattices for all components Design lattices for transfer lines between the components Resolve physical interferences, beamline crossings etc  Floor Coordinates Carry out end-to-end tracking study  Machine Acceptance Chromatic corrections with sextupoles implemented Engineer individual active elements (magnets and RF cryo modules) Element count and costing Presently completed Optics design Pre-accelerator (244 MeV-0.9) + injection double chicane RLA I (0.9-3.6 GeV) 4.5 pass linac Droplet Arcs1-4

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