RING-RING DESIGN. Miriam Fitterer, CERN - KIT for the LHeC study group

RING-RING DESIGN Miriam Fitterer, CERN - KIT for the LHeC study group

LHeC Design Options

LHeC Design Options Linac-Ring

LHeC Design Options Linac-Ring Ring-Ring Point 4 P Z4 5 P M4 5 P X4 6 Point 5 P X5 6 P o in t 3.3 P Z 3 3 RZ3 3 UJ 3 2 UJ 3 3 RE 32 RE 38 UJ 4 3 RE 42 UX4 5 UJ 4 4 RA4 3 UL4 4 UA4 3 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS RF P M5 6 TU5 6 UJ 5 6 UL5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 P X6 4 TD 62 P M6 5 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 TZ3 2 P M3 2 P o in t 3.2 UJ 6 7 UJ 6 8 TD6 8 UD6 8 N RE 68 UP 68 RE 28 Point 7 RE 72 UJ 2 7 UA2 7 Point 2 P M7 6 P GC2 RA2 7 UL 26 P M2 5 UP 2 5 US 2 5 UJ 2 6 UX2 5 e p P X2 4 UL 24 UW 2 5 UA2 3 UJ 2 4 UJ 23 RA2 3 RH2 3 UJ 2 2 TI 2 RE 22 PMI 2 RE 18 RT 18 P o in t 1.8 S P S Point 1 P M1 5 PM 18 P X1 5 P X1 6 P X1 4 UJ 1 8 US 1 5 RR1 7 UJ 1 7 UL1 6 UL1 4 UJ 1 4 RF TI 1 8 UJ 1 6 UX1 5 ATLAS US A1 5 e-injector TT 40 PGC 8 LS S 4 TJ 8 TI 8 UJ 88 UJ 1 3 RE 12 RE 88 RR1 3 UJ 12 TI 1 2 RT1 2 Point 8 PM 85 UW 8 5 P X8 4 UA 83 P Z8 5 UL 84 US 85 UA8 7 UL 86 RA8 3 UJ 8 7 UJ 8 4 TX8 4 UJ 86 UX 85 RA 87 RH 87 RE 78 RE 82 UJ 83 UJ 8 2 TZ7 6 LEP LHC LHeC RR7 7 UJ 7 6 RR7 3

LHeC Design Options Linac-Ring Ring-Ring P Z 3 3 RZ3 3 RE 38 UJ 3 2 UJ 3 3 RE 32 P M3 2 TZ3 2 P o in t 3.3 P o in t 3.2 UJ 4 3 RE 42 Point 4 RA4 3 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P X4 6 P M4 5 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS Point 5 P X5 6 RF P M5 6 UJ 5 6 UL5 6 TU5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 TD 62 P M6 5 P X6 4 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 UJ 6 8 TD6 8 UD6 8 N RE 68 UP 68 RE 28 Point 7 RE 72 UJ 2 7 UA2 7 Point 2 P M7 6 P GC2 RA2 7 UL 26 P M2 5 UP 2 5 UJ 2 6 US 2 5 e p UX2 5 UJ 2 4 RA2 3 RH2 3 UJ 2 2 P X2 4 UL 24 UW 2 5 UA2 3 UJ 23 TI 2 RE 22 PMI 2 RE 18 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 RT 18 P M1 5 P X1 5 P X1 4 US 1 5 UL1 4 UJ 1 4 TI 1 8 UJ 1 6 UX1 5 ATLAS S P S Point 1 US A1 5 RF e-injector TT 40 PGC 8 LS S 4 TJ 8 TI 8 UJ 88 UJ 1 3 RE 12 RE 88 RR1 3 UJ 12 TI 1 2 RT1 2 UJ 8 7 RH 87 UA8 7 UW 8 5 RA 87 Point 8 US 85 UL 86 UJ 86 PM 85 P Z8 5 UL 84 UX 85 P X8 4 TX8 4 UA 83 UJ 8 4 RA8 3 RE 78 RE 82 UJ 83 UJ 8 2 RR7 7 RR7 3 TZ7 6 LEP LHC LHeC UJ 7 6

General Layout

General Layout P Z 3 3 RZ3 3 RE 38 UJ 3 2 UJ 3 3 RE 32 P M3 2 TZ3 2 P o in t 3.3 P o in t 3.2 UJ 4 3 RE 42 Point 4 RA4 3 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P X4 6 P M4 5 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS Point 5 P X5 6 P M5 6 UJ 5 6 UL5 6 TU5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 TD 62 P M6 5 P X6 4 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 UJ 6 8 TD6 8 UD6 8 N RE 68 UP 68 RE 28 Point 7 RE 72 UJ 2 7 UA2 7 Point 2 P M7 6 P GC2 RA2 7 UL 26 P M2 5 UP 2 5 UJ 2 6 US 2 5 P X2 4 UL 24 UX2 5 UJ 2 4 RA2 3 RH2 3 UJ 2 2 UW 2 5 UA2 3 UJ 23 TI 2 RE 22 PMI 2 RE 18 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 RT 18 TI 1 8 UJ 1 6 ATLAS S P S Point 1 US A1 5 P M1 5 P X1 5 P X1 4 US 1 5 UL1 4 UJ 1 4 UX1 5 TT 40 PGC 8 LS S 4 TJ 8 TI 8 UJ 88 UJ 1 3 RE 12 RE 88 RR1 3 UJ 12 TI 1 2 RT1 2 Point 8 PM 85 UW 8 5 P X8 4 UA 83 P Z8 5 UL 84 US 85 UA8 7 UL 86 RA8 3 UJ 8 7 UJ 8 4 TX8 4 UJ 86 UX 85 RA 87 RH 87 RE 78 RE 82 UJ 83 UJ 8 2 TZ7 6 LEP LHC RR7 7 UJ 7 6 RR7 3

General Layout P Z 3 3 RZ3 3 RE 38 UJ 3 2 UJ 3 3 RE 32 P M3 2 TZ3 2 P o in t 3.3 P o in t 3.2 UJ 4 3 RE 42 Point 4 RA4 3 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P X4 6 P M4 5 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS Point 5 P X5 6 RF P M5 6 UJ 5 6 UL5 6 TU5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 TD 62 P M6 5 P X6 4 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 UJ 6 8 TD6 8 UD6 8 N RE 68 UP 68 RE 28 Point 7 RE 72 UJ 2 7 UA2 7 Point 2 P M7 6 P GC2 RA2 7 UL 26 P M2 5 UP 2 5 UJ 2 6 US 2 5 e p P X2 4 UL 24 UX2 5 UJ 2 4 RA2 3 RH2 3 UJ 2 2 UW 2 5 UA2 3 UJ 23 TI 2 RE 22 PMI 2 RE 18 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 RT 18 S P S Point 1 P M1 5 P X1 5 P X1 4 US 1 5 UL1 4 UJ 1 4 TI 1 8 UJ 1 6 UX1 5 ATLAS US A1 5 RF e-injector TT 40 PGC 8 LS S 4 TJ 8 TI 8 UJ 88 UJ 1 3 RE 12 RE 88 RR1 3 UJ 12 TI 1 2 RT1 2 Point 8 PM 85 UW 8 5 P X8 4 UA 83 P Z8 5 UL 84 US 85 UA8 7 UL 86 RA8 3 UJ 8 7 UJ 8 4 TX8 4 UJ 86 UX 85 RA 87 RH 87 RR7 3 TZ7 6 UJ 7 6 RE 78 RR7 7 RE 82 UJ 8 2 UJ 83 LEP LHC LHeC

General Layout P Z 3 3 RZ3 3 RE 38 UJ 3 2 UJ 3 3 RE 32 P M3 2 TZ3 2 P o in t 3.3 P o in t 3.2 UJ 4 3 RE 42 Point 4 RA4 3 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P X4 6 P M4 5 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS Point 5 P X5 6 RF P M5 6 UJ 5 6 UL5 6 TU5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 TD 62 P M6 5 P X6 4 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 UJ 6 8 TD6 8 UD6 8 N RE 68 UP 68 RE 28 Point 7 RE 72 UJ 2 7 UA2 7 Point 2 P M7 6 P GC2 RA2 7 UL 26 P M2 5 UP 2 5 UJ 2 6 US 2 5 e p P X2 4 UL 24 UX2 5 UJ 2 4 RA2 3 RH2 3 UJ 2 2 UW 2 5 UA2 3 UJ 23 TI 2 RE 22 PMI 2 RE 18 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 RT 18 P M1 5 P X1 5 P X1 4 US 1 5 UL1 4 UJ 1 4 TI 1 8 UJ 1 6 UX1 5 ATLAS S P S Point 1 US A1 5 RF e-injector TI 1 2 UJ 1 3 LS S 4 RR1 3 RT1 2 UJ 12 TT 40 PGC 8 TJ 8 TI 8 RE 12 RE 88 UJ 88 0.6 GeV from EPA UJ 8 7 RH 87 UA8 7 UW 8 5 RA 87 Point 8 US 85 UL 86 UJ 86 PM 85 P Z8 5 UL 84 UX 85 P X8 4 TX8 4 UA 83 UJ 8 4 RA8 3 RR7 3 TZ7 6 UJ 7 6 RE 78 RR7 7 RE 82 UJ 8 2 UJ 83 LEP LHC LHeC 6.87 GeV 3.73 GeV ~20 m 4 ILC RF-units, 156 m, providing 3.13 GV 10 GeV to LHeC

General Layout P Z 3 3 RZ3 3 RE 38 UJ 3 2 UJ 3 3 RE 32 P M3 2 TZ3 2 P o in t 3.3 P o in t 3.2 UJ 4 3 RE 42 Point 4 RA4 3 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P X4 6 P M4 5 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS Point 5 P X5 6 RF P M5 6 UJ 5 6 UL5 6 TU5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 TD 62 P M6 5 P X6 4 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 Bypass CMS x 124 m free sections 20 10 IP5 UJ 6 8-600 TD6 8 600 UD6 8 81 m 92 m z RE 28 N RE 68 UP 68-10 UJ 2 7 UA2 7 Point 2 Point 7 P M7 6 RE 72 S.BP -20 E.BP P GC2 RA2 7 UL 26 P M2 5 UP 2 5 UJ 2 6 US 2 5 e p P X2 4 UL 24 UX2 5 UJ 2 4 RA2 3 RH2 3 UJ 2 2 UW 2 5 UA2 3 UJ 23 TI 2 RE 22 PMI 2 RE 18 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 RT 18 S P S Point 1 P M1 5 P X1 5 P X1 4 US 1 5 UL1 4 UJ 1 4 TI 1 8 UJ 1 6 UX1 5 ATLAS US A1 5 RF e-injector TI 1 2 UJ 1 3 LS S 4 RR1 3 RT1 2 UJ 12 TT 40 PGC 8 TJ 8 TI 8 RE 12 RE 88 UJ 88 0.6 GeV from EPA UJ 8 7 RH 87 UA8 7 UW 8 5 RA 87 Point 8 US 85 UL 86 UJ 86 PM 85 P Z8 5 UL 84 UX 85 P X8 4 TX8 4 UA 83 UJ 8 4 RA8 3 RR7 3 TZ7 6 UJ 7 6 RE 78 RR7 7 RE 82 UJ 8 2 UJ 83 LEP LHC LHeC 6.87 GeV 3.73 GeV ~20 m 4 ILC RF-units, 156 m, providing 3.13 GV 10 GeV to LHeC

General Layout P Z 3 3 RZ3 3 RE 38 UJ 3 2 UJ 3 3 RE 32 P M3 2 TZ3 2 P o in t 3.3 P o in t 3.2 UJ 4 3 RE 42 Point 4 RA4 3 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P X4 6 P M4 5 TX4 6 UJ 4 6 UL4 6 US 4 5 UW 4 5 RA4 7 UA4 7 Detector UJ 4 7 RE 48 RE 52 RR 53 UJ 5 3 UL 54 UP 5 3 RZ5 4 UXC5 5 P M5 4 US C5 5 UJ 5 6 1 CMS Point 5 P X5 6 RF P M5 6 UJ 5 6 UL5 6 TU5 6 UJ 5 7 RE 58 RE 62 RR 57 UP 62 Point 6 UD 62 TD 62 P M6 5 P X6 4 P Z6 5 UJ 62 RA6 3 TX6 4 UJ 63 UA6 3 UX6 5 UJ 6 4 UL6 4 UJ 6 6 RA6 7 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 Bypass CMS x 124 m free sections 20 10 IP5 UJ 6 8-600 TD6 8 600 UD6 8 81 m 92 m z RE 28! $# N RE 68 UP 68-10! "# UJ 2 7 UA2 7 Point 2 l* 1 Point 7 P M7 6 RE 72 S.BP -20 E.BP P GC2 RA2 7 UL 26 P M2 5 UP 2 5 UJ 2 6 US 2 5 e p P X2 4 UL 24 UX2 5 UJ 2 4 RA2 3 RH2 3 UJ 2 2 UW 2 5 UA2 3 UJ 23 TI 2 RE 22 PMI 2 RE 18 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 RT 18 S P S Point 1 P M1 5 P X1 5 P X1 4 US 1 5 UL1 4 UJ 1 4 TI 1 8 UJ 1 6 UX1 5 ATLAS US A1 5 RF e-injector TI 1 2 l* 2 UJ 1 3 LS S 4 RR1 3 RT1 2 UJ 12 TT 40 PGC 8 TJ 8 TI 8 RE 12 RE 88 UJ 88 0.6 GeV from EPA UJ 8 7 RH 87 UA8 7 UW 8 5 RA 87 Point 8 US 85 UL 86 UJ 86 PM 85 P Z8 5 UL 84 UX 85 P X8 4 TX8 4 UA 83 UJ 8 4 RA8 3 RR7 3 TZ7 6 UJ 7 6 RE 78 RR7 7 RE 82 UJ 8 2 UJ 83 LEP LHC LHeC 6.87 GeV 3.73 GeV ~20 m 4 ILC RF-units, 156 m, providing 3.13 GV 10 GeV to LHeC

Injector LHeC requires new 10 GeV e+/e- injector Pre-injector: e.g. LIL+EPA type e+/e- Injector (LEP) - 0.6 GeV at extraction Injector: simplified and down scaled ELFE design: Total filling time less than 10 minutes 0.6 GeV from EPA 6.87 GeV 3.73 GeV ~20 m 4 ILC RF-units, 156 m, providing 3.13 GV Recirculating linac 10 GeV to LHeC

Main Ring Design Parameters Electrons Protons Energy 60 GeV 7 TeV Current 100 ma 860 ma Part. per bunch 2 10 10 1.7 10 11 Numb. of bunches 2808 2808 εx /εy 5.0 / 2.5 nm 0.5 / 0.5 nm Pγ < 50 MW

Main Ring - Integration I p-ring and e-ring have to fit into the existing LHC tunnel Match e-ring and p-ring circumference, because: p-beam could be heated up by the e-beam in the case of asymmetric collision schemes [*] [*] K. Hirata and E. Keil, Barycenter motion of beams due to beam-beam interaction in asymmetric ring colliders, Proc. EPAC 1990 LHeC Bypasses increase the circumference compensation by placing the ring more on the inside in respect to the LHC Typical cross section of the LHC tunnel

Main Ring - Integration II Main Challenges: 1. QRL jumper connection at every second proton quadrupole in the main arc and around 8 per straight section QRL jumper connection 2. Insertions, especially Dump Area, Collimation, RF, Cryogenics...

Main Ring - Optics Βx, Βy, 100Dx 100Dy m 140 120 100 80 60 40 20 0 0 20 40 60 80 100 Main Arc: sm 2 LFODO, LHeC LFODO, LHC FODO lattice with no elements at positions of QRL jumper connection main integration interferences avoided Βx, Βy, 100Dx 100Dy m 150 100 50 0 Insertions 0 200 400 600 800 sm similar design for even and odd insertions exemplarily avoiding QRL jumper connections in insertions detailed design for each insertions at a later stage, but no real show stoppers

Bypass Layout General Design: Insertion of a straight section into the lattice leads to a separation normal bend straight ΔBP LBP Lnew tunnel Ltot, straight sections ATLAS 16.25 m 1303.3 m 1061 m 172 m inverted bend arc CMS 20.56 m 1303.3 m 1061 m 297 m Bypass ATLAS x S.BP1 20 E.BP1 Bypass CMS x 124 m free sections 20 RF 10 10 38 m 50 m -500 IP1 500 z IP5-600 600 81 m 92 m -10 z free sections -10 RF 42 m 42 m Injection S.BP -20 E.BP -20

Bypass Optics TLIR IR TRIR DSLSSL LSSL BP Nomenclature LSSR DSLSSR βx, max 142 βy, max 138 Βx, Βy, 100Dx 100Dy m 150 100 50 0 50 8 14 14 8 LSSL IR LSSR DSLSSL TLIR TRIR DSLSSR 0 500 1000 1500 sm

0.3 electron beam x [m] 0.2 0.1 0-0.1 Proton final focusing half quadrupole Interaction Region separator dipole Proton beam 1 Degree 2 6.2 m Electron final focusing quads Electron beam proton beam -0.2-0.3 0.3 0.2 0.1-30 -25-20 proton half quadrupole Proton final focusing half quadrupole -15 electron -10-5 doublet Electron separator dipole SR Absorber 0 5 10 15 20 25 30 z [m] 10 Degree 2 1.2 m Electron final focusing quads separator dipole synrad absorber synrad absorber proton beam electron beam x [m] 0-0.1 Proton beam Electron beam -0.2-0.3-30 -25-20 -15-10 -5 electron triplet Electron separator dipole SR Absorber proton half quadrupole 0 5 10 15 20 25 30 z [m]

Beamsize: σ = βɛ High Acceptance (1 Degree) Parameters Reminder: Beta-function (drift space) β(s) =β + l 2 High Luminosity (10 Degree) β Electrons Protons βx 0.4 m 4.05 m βy 0.2 m 0.97 m l* 6 m 22.96 m σx 45 µm σy 22 µm Crossing angle 1 mrad Luminosity 8.54 10 32 cm -2 s -1 Luminosity loss factor 86% Luminosity 7.33 10 32 cm -2 s -1 Pγ Ec 51 kw 163 kev Electrons Protons βx 0.18 m 1.8 m βy 0.1 m 0.5 m l* 1.2 m 22.96 m σx 30 µm σy 15.8 µm Crossing angle 1 mrad Luminosity 1.8 10 33 cm -2 s -1 Luminosity loss factor 75% Luminosity 1.34 10 33 cm -2 s -1 Pγ Ec 33 kw 126 kev

IR Optics - Electrons 1 Degree 600 Βx, Βy, 100Dx 100Dy m 400 200 0 0 200 400 600 800 sm

IR Optics - Electrons 10 Degree 300 250 Βx, Βy, 100Dx 100Dy m 200 150 100 50 0 50 0 200 400 600 800 sm

e-a Collisions Assume present nominal Pb beam in LHC: same beam size as protons, fewer bunches (592 bunches, Nb=7 10 7 208 Pb 82+ nuclei) Assume e-injector chain can provide the desired bunch pattern (592 bunches of Nb=6 10 10 e - ) Lepton-nucleus and lepton-nucleon luminosity at 60 GeV and 45 MW synchrotron radiation losses L=5 10 29 cm -2 s -1 Len=1 10 31 cm -2 s -1

Main Ring NC Magnet Design Dipole Challenge: Field reproducibility at injection (10 GeV) Constant field quality during the ramp Compactness Compatibility with synchrotron radiation power 35 cm Models by BINP (silicon steel iron lamination) and CERN (interleaved iron plastic laminations plastic: iron=2:1) achieving required field reproducibility. Beam Energy 10-60 GeV Number of magnets 3080 Magnetic length Magnetic field Vertical aperture Pole width Conductor material Total power consumption of all dipoles at 60 GeV Cooling Field reproducibility 5.35 m 127-763 Gauss 40 mm 150 mm copper/aluminium 0.8 MW air or water (depending on tunnel ventilation) <0.1 Gauss

Arc quadrupole: Main Ring NC Magnet Design Quadrupole Challenge: Compactness Insertion/bypass quadrupoles: 30 cm Number of magnets Magnetic length Magnetic field 368 (QF) + 368 (QD) 1.0 m 8.4 (QD) 10.28 T/m (QF) Number of magnets Magnetic length Magnetic field 35 cm 148 (QF) + 148 (QD) 1.0 m (QF) / 0.7 m (QD) approx. 18 T/m Radial aperture 30 mm Radial aperture 30 mm Weight 700 kg Weight 700 kg (QF) / 500 kg (QD) Conductor material copper Conductor material copper Total power (60 GeV) 2.5 kw Total power (60 GeV) 6.0 kw (QF) / 4.5 kw (QD) Cooling water Cooling water

Proton SC IR Magnets Separation Scheme: 0.3 Electron final focusing quads 0.2 0.1 Proton final focusing half quadrupole separator dipole proton beam x [m] electron beam 0-0.1 Proton beam Electron beam -0.2-0.3 Electron separator dipole synrad absorber SR Absorber -30-25 -20 proton half quadrupole -15-10 -5 0 5 10 15 20 25 30 Magnet Design: similar to LHC MQXA magnets, no real challenges in respect of gradient Challenge: - field free region for electron - allow for a minimal distance between electron and proton beam z [m]

e Proton SC IR Magnets Proton SC magnet design Q1: Half Quadrupole with field free regions for the e-beam Radial aperture B0 g0 Beam separation operation percentage on the load line of the sc Bfringe e-aperture gfringe e-aperture Q2: Single aperture 0 20 40 60 80 100 120 140 160 160 180 180 Q1 Q2 35 mm 137 T/m 2.5 T 65 mm 36 mm 137 T/m 107 mm 77% 73% 0.03 T 0.8 T/m 0.016 T 0.5 T/m 200

Main Ring RF SPL type cavities: 120 cavities 721.4 MHz in total 500 MV 9.8 MV/m (conservative assumpt., SPL assumes 25 MV/m) 8 double cell cavities in 12 m cryomodules, 15 cryomodules total ->180 m + space for quads etc. feed two cavities with one 1 MW klystron UJ 2 7 RA2 7 UJ 2 6 UJ 3 2 UJ 3 3 RE 28 TZ3 2 UX2 5 P o in t 3.3 P Z 3 3 RZ3 3 RE 32 P X2 4 UJ 2 4 P M3 2 UA2 7 Point 2 P GC2 UL 26 P M2 5 UP 2 5 US 2 5 e p P o in t 3.2 2 3 cryomodules = 2 36 m 2 12 klystrons RA2 3 RH2 3 UL 24 UJ 2 2 RE 38 UW 2 5 UA2 3 UJ 23 TI 2 UJ 4 3 RE 42 RE 22 PMI 2 RE 18 Point 4 RA4 3 RT 18 UA4 3 P Z4 5 UX4 5 UJ 4 4 UL4 4 P o in t 1.8 PM 18 P X1 6 UJ 1 8 RR1 7 UJ 1 7 UL1 6 TI 1 8 UJ 1 6 ATLAS P M4 5 US 4 5 UW 4 5 US A1 5 P X4 6 TX4 6 UL4 6 S P S UJ 4 6 Point 1 P X1 5 RF P M1 5 UX1 5 P X1 4 RA4 7 UA4 7 US 1 5 UL1 4 UJ 1 4 e-injector 9 cryomodules = 108 m 36 klystrons TI 1 2 UJ 4 7 UJ 1 3 RR1 3 N LS S 4 RT1 2 RE 48 RE 52 UJ 12 RR 53 TT 40 PGC 8 UJ 5 3 TJ 8 UL 54 TI 8 UP 5 3 RZ5 4 UXC5 5 RE 12 RE 88 P M5 4 US C5 5 UJ 88 UJ 5 6 1 CMS Point 5 UJ 8 7 RH 87 P X5 6 RF UA8 7 P M5 6 UJ 5 6 UL5 6 TU5 6 UW 8 5 RA 87 Point 8 US 85 UL 86 UJ 86 PM 85 UJ 5 7 RR 57 RE 58 RE 62 P Z8 5 UL 84 UX 85 UP 62 P X8 4 UD 62 TD 62 UJ 62 UJ 63 UA6 3 UJ 6 4 TX8 4 UL6 4 RA6 3 P M6 5 P X6 4 P Z6 5 UL6 6 UW 6 5 US 6 5 UA6 7 UJ 6 7 UA 83 UJ 8 4 RA8 3 Point 7 P M7 6 RE 78 RE 82 UJ 83 UJ 8 2 Point 6 TZ7 6 TX6 4 UX6 5 UJ 6 6 LEP LHC LHeC RA6 7 RR7 7 RE 68 RE 72 UJ 6 8 TD6 8 UJ 7 6 RR7 3 UD6 8 UP 68

Cryogenics Bypasses: Cryogenic requirements: SPL type cryomodules three cryoplants (like LHC/ LEP2) 2 K operation Total electrical power: approx. 5 MW '()*+,&-.&/)0-%-123!4& /)0-53$+(& 8;:&#!$%& :)0-&53$+(&!"#!$%& '()*+,&-.&/)0-%-123!4& 0.6 GeV from EPA 6786'&& 1!(!/(-)& /$9!)+& 6.87 GeV 3.73 GeV 4 ILC RF-units, 156 m, providing 3.13 GV 10 GeV to LHeC ~20 m Injector: Cryogenic requirements: 12 ILC (XFEL) type cryomodules one cryoplant of modest size 2 K operation

Summary Challenges: Integration (bypasses around the remaining p- experiments + e-ring integration into existing LHC tunnel) Main arc dipole magnet design (low field and high field quality dipole magnet) Interaction region (beam separation) Final focus proton magnets (quadrupoles with field free regions for the electron beam)

THANK YOU FOR YOUR ATTENTION

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Polarization Polarization of 25% to 40% at 60 GeV can be reasonably aimed for with harmonic closed orbit spin matching precision alignment of the magnets to better of 150 µm rms needed to achieve a high polarization level option of having siberian snakes

Synchrotron Radiation IR 1 Degree e - Power [kw] critical energy [kev] DL 13.9 118 QL2 6.2 318 QL1 5.4 294 QR1 5.4 293 QR2 6.3 318 DR 13.9 118 Total/ Avg 51.1 163

Synchrotron Radiation IR 10 Degree e - Power [kw] critical energy [kev] DL 6.4 71 QL3 5.3 308 QL2 4.3 218 QL1 0.6 95 QR1 0.6 95 QR2 4.4 220 QR3 5.2 310 DR 6.4 71 Total/ Avg 33.2 126

Main Ring Lattice Parameters Beam Energy 60 GeV Numb. of Part. per Bunch 2.0 10 10 Numb. of Bunches 2808 Circumference 26658.8832 m Syn. Rad. Loss per Turn 437.2 MeV Power 43.72 MW Damping Partition J x /J y /J e 1.5/1/1.5 Damping Time τ x 0.016 s Damping Time τ y 0.025 s Damping Time τ e 0.016 s Polarization Time 61.71 min Coupling Constant κ 0.5 Horizontal Emittance (no coupling) 5.53 nm Horizontal Emittance (κ = 0.5) 4.15 nm Vertical Emittance (κ = 0.5) 2.07 nm RF Voltage V RF 500 MV RF frequency f RF 721 MHz Bunch Length 6.88 mm Max. Hor. Beta 141.94 m Max. Ver. Beta 138.43 m 84.0 83.8 83.6 83.4 83.2 1 Deg 10 Deg possible working point 122.2 122.4 122.6 122.8 123.0 123<Qx<24 83<Qy<84