Optics ‘Scrapbook’ for ERL Test Facility Alex Bogacz November 13, 2012

Two passes ‘up’ + Two passes ‘down’ ERL-TF (300 MeV) - Layout 5 MeV DE = 75 MeV DE = 75 MeV DC = l/2 5 MeV Two passes ‘up’ + Two passes ‘down’ Alex Bogacz November 13, 2012

Two passes ‘up’ + Two passes ‘down’ ERL-TF (300 MeV) - Layout 5 MeV DE = 75 MeV DE = 75 MeV DC = l/2 5 MeV Two passes ‘up’ + Two passes ‘down’ Alex Bogacz November 13, 2012

Arc 1 Optics – FMC Lattice 7.09188 10 2 -2 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y 80 MeV 4×450 sector bends Qx,y = 1.25 triplet: Q1 Q2 Q3 singlet: Q4 triplet: Q3 Q2 Q1 quadrupoles (10 cm long) Q1 G[kG/cm] = -0.34 Q2 G[kG/cm] = 0.47 Q3 G[kG/cm] = -0.30 Q4 G[kG/cm] = -0.33 dipoles (40 cm long) B = 5.01 kGauss Alex Bogacz November 13, 2012

Arc 3 Optics – FMC Lattice 7.52109 10 2 -2 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y 230 MeV 8×22.50 sector bends Qx,y = 1.25 triplet: Q1 Q2 Q3 singlet: Q4 triplet: Q3 Q2 Q1 quadrupoles (15 cm long) Q1 G[kG/cm] = -0.40 Q2 G[kG/cm] = 1.37 Q3 G[kG/cm] = -1.10 Q4 G[kG/cm] = -0.43 dipoles (40 cm long) B = 7.47 kGauss Alex Bogacz November 13, 2012

Switchyard - Vertical Separation of Arcs Arc 1 (80 MeV) Arc 3 (230 MeV) Alex Bogacz November 13, 2012

Vertical Spreaders - Optics Spr. 1 (80 MeV) Spr. 3 (230 MeV) 3.93848 20 1 -1 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y 3.72387 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 November 13, 2012

Arc 1 Optics (80 MeV) – arc1.mdx 14.9688 20 2 -2 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y Isochronous Arc pathlength: 36 × lRF 2-step vert. Spreader 1800 Arc 2-step vert. Recombiner Spr. dipoles: 300 bends (1 rec. + 3 sec.) Lb = 30 cm B = 5 kGauss Arc dipoles : 4450 bends(sec.) Lb = 40 cm B = 5 kGauss Rec. dipoles: 300 bends (3 sec. + 1 rec.) Lb = 30 cm B = 5 kGauss quads: Lq = 10-15 cm G  0.6 kGauss/cm Alex Bogacz November 13, 2012

Arc 2 Optics (155 MeV) – arc2.mdx 14.9688 20 2 -2 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y Isochronous Arc pathlength: 36 × lRF 2-step vert. Spreader Magnetic field scaling (dipoles and quads) ‘Arc 2’ = ‘2’  ‘Arc 1’ 1800 Arc 2-step vert. Recombiner Spr. dipoles: 300 bends (1 rec. + 3 sec.) Lb = 30 cm B = 10 kGauss Arc dipoles : 4450 bends(sec.) Lb = 40 cm B = 10 kGauss Rec. dipoles: 300 bends (3 sec. + 1 rec.) Lb = 30 cm B = 10 kGauss quads: Lq = 10-15 cm G  1.2 kGauss/cm Alex Bogacz November 13, 2012

Arc 3 Optics (230 MeV) – arc3.mdx 14.9688 20 2 -2 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y Isochronous Arc pathlength: 36× lRF Chicane vert. Spreader Chicane vert. Recombiner 1800 Arc Spr. dipoles: 100 -200 -100 bends ( rec.) Lb = 30 cm B = 5 and 10 kGauss Arc dipoles : 822.50 bends(sec.) Lb = 40 cm B = 5 kGauss Rec. dipoles: 100 -200 -100 bends ( rec.) Lb = 30 cm B = 5 and 10 kGauss quads: Lq = 10-15 cm G  1.2 kGauss/cm Alex Bogacz November 13, 2012

Arc 4 Optics (305 MeV) – arc4.mdx 14.9688 20 2 -2 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y Isochronous Arc pathlength: 35.5 × lRF Chicane vert. Spreader Magnetic field scaling (dipoles and quads) ‘Arc 4’ = ‘4/3’  ‘Arc 3’ Chicane vert. Recombiner 1800 Arc Spr. dipoles: 100 -200 -100 bends ( rec.) Lb = 30 cm B = 6.7 and 13.4 kGauss Rec. dipoles: 100 -200 -100 bends ( rec.) Lb = 30 cm B = 6.7 and 13.4 kGauss Arc dipoles : 822.50 bends(sec.) Lb = 40 cm B = 6.7 kGauss quads: Lq = 10-15 cm G  1.6 kGauss/cm Alex Bogacz November 13, 2012

Linac 1 and 2 - Symmetized Optics Arc 2 7.4 12 5 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y Arc 3 Linac 1 – linac1.mdx 155 MeV 230 MeV inj 7.4 12 5 BETA_X&Y[m] DISP_X&Y[m] BETA_X BETA_Y DISP_X DISP_Y Arc 3 Arc 4 Linac 2 – linac2.mdx 230 MeV ext 305 MeV Alex Bogacz November 13, 2012

Linac 1 and 2 - Multi-pass ER Optics Alex Bogacz November 13, 2012

Summary ERL-TF at CERN Multi-pass linac Optics in ER mode ‘Test bed’ for SRF cavities at high current Multi-pass linac Optics in ER mode Choice of linac RF - 721 MHz SRF Linear lattice: 2-pass ‘up’ + 2-pass ‘down’ Arc Optics Choice Synchronous acceleration → Isochronous arcs Flexible Momentum Compaction Optics Complete Arc Architecture Vertical switchyard Matching sections: Linac-Switchyard-Arc ‘First cut’ Lattice design for ERL-TF Two Linacs + Four Arcs Alex Bogacz November 13, 2012