Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz Status and Plans for Linac and RLAs

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 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)

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 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

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz RLA requirements Large transverse and longitudinal acceptances Simultaneous acceleration of both  +  - species Rapid acceleration – fixed field magnets, high gradient SRF Manageable orbit separation at recirculation arcs Beam dynamics issues ‘Full bucket’ acceleration – longitudinal compression Phase slippage in the linacs Multi-pass linac optics Droplet return arc – compact lattice design and matching Chromatic corrections ‘Dogbone’ RLA – Opportunities and Challenges

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 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

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 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 Longitudinal phase-space (s,  p/p) axis range: s = ±25 cm,  p/p = ±0.2

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Injection double-chicane      

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009NFMCC Collaboration Meeting, LBNL, January 27, 2009 Pre-accelerator–Chicane–Linac Matching  = 2×10 -5

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Multi-pass linac Optics 1-pass, MeV ‘half pass’, MeV initial phase adv/cell 90 deg. scaling quads with energy mirror symmetric quads in the linac quad gradient

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Multi-pass linac Optics 2-pass, MeV 3-pass, MeV phase adv. diminish uniformly in both planes

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Multi-pass linac Optics 4-pass, MeV phase adv. still larger then 180 deg. in both planes 5-pass, MeV

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, cells in 2 cells out (  out =  in and  out = -  in, matched to the linacs) transition E =1.2 GeV Mirror-symmetric ‘Droplet’ Arc – Optics

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 ‘Droplet’ Arcs scaling – RLA I i = 1…4E i [GeV]p i /p 1 cell_outcell_inlength [m] Arc ×22× Arc21.83/2 2×32× Arc ×42× Arc43.05/22×52× 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

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 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)

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 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

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Linac1-to-Arc2 – Beta Match E =1.8 GeV Noticeable mis-match at the end of Linac1 ‘Matching quads’ are invoked

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Linac1-to-Arc2 – Beta Match E =1.8 GeV No 90 0 phase adv/cell maintained across the ‘junction’ Chromatic corrections needed

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Linac1-to-Arc2 – Chromatic compensation E =1.8 GeV Chromatic corrections with two pairs of sextupoles

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Linac1-to-Arc2 - Chromatic Corrections initial uncorrected two families of sextupoles

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 ‘Droplet’ Arcs scaling – RLA II i = 1…4E i [GeV]p i /p 1 cell_outcell_inlength [m] Arc ×22× Arc26.63/2 2×32× Arc ×42× Arc410.65/22×52× 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

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, pass, GeV RLA II - linac Optics mirror symmetric quads in the linac Quad gradient length

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Work Plan

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 Work Plan cont.

Operated by JSA for the U.S. Department of Energy Thomas Jefferson National Accelerator Facility Alex Bogacz EUROnu Annual Meeting, CERN, March 26, 2009 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 Chromatic corrections with sextupoles implemented Presently completed Optics design Pre-accelerator (244 MeV-0.9) + injection double chicane RLA I ( GeV) and RLA II ( GeV) 4.5 pass linac Droplet Arcs1-4 Still to do…. End-to-end simulation Engineer individual active elements (magnets and RF cryo modules) Element count and costing