RING-RING DESIGNMiriam Fitterer, CERN - KIT
for the LHeC study group
e
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e LHeC Design Options
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e LHeC Design OptionsLinac-Ring
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e LHeC Design OptionsLinac-Ring
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
LHeCe-injecto
r
RF
RF
e
p
Ring-Ring
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e LHeC Design OptionsLinac-Ring
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
LHeCe-injecto
r
RF
RF
e
p
Ring-Ring
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e General Layout
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e General Layout
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e General Layout
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
e-injecto
r
LHeC
RF
RF
e
p
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e General Layout
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
e-injecto
r
LHeC
RF
RF
e
p
0.6 GeVfrom EPA
4 ILC RF-units, 156 m, providing 3.13 GV
3.73 GeV
10 GeV to LHeC
~20 m
6.87 GeV
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e General Layout
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
e-injecto
r
LHeC
RF
RF
e
p
0.6 GeVfrom EPA
4 ILC RF-units, 156 m, providing 3.13 GV
3.73 GeV
10 GeV to LHeC
~20 m
6.87 GeV
Bypass CMSx
z
S.BP E.BP
IP5
- 600 600
20
10
-20
-10
81 m 92 m
124 m free sections
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e General Layout
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
e-injecto
r
LHeC
RF
RF
e
p
0.6 GeVfrom EPA
4 ILC RF-units, 156 m, providing 3.13 GV
3.73 GeV
10 GeV to LHeC
~20 m
6.87 GeV
Bypass CMSx
z
S.BP E.BP
IP5
- 600 600
20
10
-20
-10
81 m 92 m
124 m free sections
!"#
!$#
l*1
l*2
Detector
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e InjectorLHeC requires new 10 GeV e+/e- injector
0.6 GeVfrom EPA
4 ILC RF-units, 156 m, providing 3.13 GV
3.73 GeV
10 GeV to LHeC
~20 m
6.87 GeV
Injector: simplified and down scaled ELFE design:
Pre-injector: e.g. LIL+EPA type e+/e- Injector (LEP) - 0.6 GeV at extractionTotal filling
time less than
10 minutes
Recirculating linac
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e
Electrons ProtonsEnergy 60 GeV 7 TeVCurrent 100 mA 860 mAPart. per bunch 2 ×1010 1.7×1011
Numb. of bunches 2808 2808εx /εy 5.0 / 2.5 nm 0.5 / 0.5 nmPγ < 50 MW
Main Ring Design Parameters
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
ep-ring and e-ring have to fit into the existing LHC tunnel
Main Ring - Integration I
Typical cross section of the LHC tunnel
LHeCBypasses increase the circumference
compensation by placing the ring more on the inside in respect to the LHC
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
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
eMain Challenges:1. QRL jumper connection at every second proton quadrupole in the main
arc and around 8 per straight section
2. Insertions, especially Dump Area, Collimation, RF, Cryogenics ...
Main Ring - Integration II
QRL jumper connection
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e
0 20 40 60 80 1000
20
40
60
80
100
120
140
s�m
�Β x,Βy,100Dx100D
y��m
Main Ring - Optics
0 200 400 600 8000
50
100
150
s�m�Β x,
Βy,100Dx100D
y��m
Main Arc:• 2 LFODO, LHeC≈ LFODO, LHC
• FODO lattice with no elements at positions of QRL jumper connection
main integration interferences avoided
Insertions• similar design for even and odd insertions• exemplarily avoiding QRL jumper
connections in insertionsdetailed design for each insertions at a later stage, but no real show stoppers
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Bypass Layout
Bypass CMSx
z
S.BP E.BP
IP5
- 600 600
20
10
-20
-10
81 m 92 m
124 m free sections
-500
Bypass ATLAS
-500 500
x
z
10
20
-10
-20
S.BP1 E.BP1
free sections
38 m 50 m
42 m 42 m
IP1
Injection
arc
invertedbend
straight
normalbend
General Design:Insertion of a straight section into the lattice leads to a separation !
ΔBP LBP Lnew tunnel Ltot, straight sections
ATLAS 16.25 m 1303.3 m ≈1061 m 172 m
CMS 20.56 m 1303.3 m ≈1061 m 297 m
RF
RF
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Bypass Optics
LSSL LSSR
IRTLIR TRIR
DSLSSL DSLSSR
BP Nomenclature
0 500 1000 1500
�50
0
50
100
150
s�m
�Β x,Βy,100Dx100D
y��m 8 14 14 8
DSLSSL DSLSSR
LSSL LSSRIR
TLIR TRIR
βx, max 142βy, max 138
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Interaction Region
z [m]
x [m]
0 5 10 15 20 25 30-5-10-15-20-25-30
0
-0.1
-0.2
-0.3
0.3
0.2
0.1
Electron separatordipole
Electron finalfocusing quads
Proton finalfocusing halfquadrupole
SR Absorber
Proton beam
Electron beam
proton beam
electron beam
1 Degree
separator dipole
electron doubletproton half
quadrupole 10 Degree
synradabsorber
2×6.2 m
proton beam
electron beam
z [m]
x [m]
0 5 10 15 20 25 30-5-10-15-20-25-30
0
-0.1
-0.2
-0.3
0.3
0.2
0.1
Electron separatordipole
Electron finalfocusing quads
Proton finalfocusing halfquadrupole
SR Absorber
Proton beam
Electron beam
electron triplet
proton half quadrupole
synradabsorber
2×1.2 mseparator
dipole
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Parameters
High Luminosity (10 Degree)High Acceptance (1 Degree)
Electrons Protonsβx 0.4 m 4.05 mβy 0.2 m 0.97 ml* 6 m 22.96 mσx 45 µm45 µmσy 22 µm22 µmCrossing angle 1 mrad1 mradLuminosity 8.54 1032 cm-2 s-18.54 1032 cm-2 s-1
Luminosity loss factor 86%86%Luminosity 7.33 1032 cm-2 s-17.33 1032 cm-2 s-1
Pγ 51 kW51 kWEc 163 keV163 keV
Reminder:Beamsize: Beta-function (drift space)
Electrons Protonsβx 0.18 m 1.8 mβy 0.1 m 0.5 ml* 1.2 m 22.96 mσx 30 µm30 µmσy 15.8 µm15.8 µmCrossing angle 1 mrad1 mradLuminosity 1.8 1033 cm-2 s-11.8 1033 cm-2 s-1
Luminosity loss factor 75%75%Luminosity 1.34 1033 cm-2 s-11.34 1033 cm-2 s-1
Pγ 33 kW33 kWEc 126 keV126 keV
! =
!
"# !(s) = !! +l!
2
!!
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e IR Optics - Electrons1 Degree
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DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e
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IR Optics - Electrons10 Degree
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e e-A Collisions
• Assume present nominal Pb beam in LHC:same beam size as protons, fewer bunches (592 bunches, Nb=7×107 208Pb82+ nuclei)
• Assume e-injector chain can provide the desired bunch pattern (592 bunches of Nb=6×1010 e-)
Lepton-nucleus and lepton-nucleon luminosity at 60 GeV and 45 MW synchrotron radiation losses
L=5×1029 cm-2s-1 ⇔ Len=1×1032 cm-2s-1
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Main Ring NC Magnet DesignDipole
Challenge:• Field reproducibility at injection (10 GeV)• Constant field quality during the ramp• Compactness• Compatibility with synchrotron radiation
power
35 cm
Beam Energy 10-60 GeVNumber of magnets 3080
Magnetic length 5.35 mMagnetic field 127 -763 Gauss
Vertical aperture 40 mmPole width 150 mm
Conductor material copper/aluminiumTotal power
consumption of all dipoles at 60 GeV
0.8 MW
Coolingair or water
(depending on tunnel ventilation)
Field reproducibility <0.1 GaussModels by BINP (silicon steel iron lamination)and CERN (interleaved iron plastic
laminations plastic: iron=2:1) achieving required field reproducibility.
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e
30 cm
QuadrupoleChallenge: Compactness
Number of magnets 368 (QF) + 368 (QD)Magnetic length 1.0 m
Magnetic field 8.4 (QD)10.28 T/m (QF)
Radial aperture 30 mmWeight 700 kg
Conductor material copperTotal power (60 GeV) 2.5 kW
Cooling water
Arc quadrupole: Insertion/bypass quadrupoles:
Number of magnets 148 (QF) + 148 (QD) Magnetic length 1.0 m (QF) / 0.7 m (QD)Magnetic field approx. 18 T/mRadial aperture 30 mm
Weight 700 kg (QF) / 500 kg (QD)Conductor material copper
Total power (60 GeV) 6.0 kW (QF) / 4.5 kW (QD)Cooling water
35 cm
Main Ring NC Magnet Design
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Proton SC IR Magnets
z [m]
x [m]
0 5 10 15 20 25 30-5-10-15-20-25-30
0
-0.1
-0.2
-0.3
0.3
0.2
0.1
Electron separatordipole
Electron finalfocusing quads
Proton finalfocusing halfquadrupole
SR Absorber
Proton beam
Electron beam
separator dipole
proton half quadrupole
synradabsorber
Separation Scheme:
proton beam
electron beam
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
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
eProton SC magnet design
Q1: Half Quadrupole with field free regions for the e-beam
0 20 40 100 120 160 180 20080 14060 180160
Q2: Single aperture
Proton SC IR Magnets
Q1 Q2Radial aperture 35 mm 36 mmB0 137 T/m 137 T/mg0 2.5 T -Beam separation 65 mm 107 mmoperation percentage on the load line of the sc 77% 73%
Bfringe e-aperture 0.03 T 0.016 Tgfringe e-aperture 0.8 T/m 0.5 T/m
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Main Ring RFSPL 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
RH2 3
RH 87
UJ 4 6
UA4 7
UJ 4 7RA4 7
UW 4 5
US 4 5UL4 6
TX4 6
UJ 4 4UX4 5
RA4 3
UA4 3UL4 4
UJ 4 3 RR 53
UJ 5 3
UXC5 5
UL 54
US C5 5
P M5 4P X5 6
RZ5 4UP 5 3
UJ 5 6 1
UJ 5 7RR 57
UJ 5 6
P M5 6
UL5 6TU5 6
UD 62
UJ 62
UJ 63
P M6 5
UJ 6 4UA6 3
RA6 3
TD 62UP 62
UL6 4
P Z6 5
P X6 4
UJ 6 6
UJ 6 7
UJ 6 8
UX6 5
UA6 7
RA6 7
TD6 8
UD6 8
UP 68
UL6 6
TX6 4
UW 6 5 US 6 5
Point 7
RR7 3
RR7 7
UJ 7 6
P M7 6
TZ7 6
RA8 3
UA 83
UJ 83
UJ 8 4
UJ 8 2
Point 8 PM 85
P X8 4
P Z8 5
UX 85TX8 4
UL 84
UA8 7
RA 87UJ 86
UJ 8 7
UW 8 5
US 85
UL 86TI 8 UJ 88
PGC 8
TJ 8
RR1 3
UJ 1 3
RT1 2
UJ 1 4
US 1 5
TI 1 2
P M1 5
P X1 4
UX1 5
UL1 4
UJ 12
RE 12 RE 88
LS S 4P o in t 1 .8
PMI 2
UJ 1 7
UJ 1 8
UJ 1 6TI 1 8
RR1 7
PM 18 P X1 6 P X1 5
US A1 5
UL1 6
UJ 2 2
UJ 23UJ 2 4
UA2 3
RA2 3
TI 2
P GC2RA2 7
UJ 2 6
P X2 4
UX2 5
P M2 5
UW 2 5US 2 5
UL 26
UL 24
UJ 2 7 UA2 7 Point 2
Point 4
P Z 3 3
P M3 2
UJ 3 2 UJ 3 3
RZ3 3
TZ3 2
Point 5
Point 6
Point 1
S P S
P X4 6P Z4 5
P M4 5
RT 18
P o in t 3 .3
P o in t 3 .2
UP 2 5
TT 40
LEPLHC
RE 32
RE 28
RE 38
RE 42
RE 48RE 52
RE 58RE 62
RE 68
RE 72
RE 78
RE 82
RE 22
RE 18
N
ATLAS
CMS
LHeCe-injecto
r
RF
RF
e
p
9 cryomodules = 108 m36 klystrons
2×3 cryomodules = 2×36 m2×12 klystrons
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Cryogenics
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Bypasses:Cryogenic requirements:• SPL type cryomodules• three cryoplants (like LHC/
LEP2)• 2 K operationTotal electrical power: • approx. 5 MW
0.6 GeVfrom EPA
4 ILC RF-units, 156 m, providing 3.13 GV
3.73 GeV
10 GeV to LHeC
~20 m
6.87 GeV
Injector:Cryogenic requirements:• 12 ILC (XFEL) type
cryomodules• one cryoplant of modest size• 2 K operation
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e SummaryChallenges:• 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)
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e SummaryChallenges:• 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)
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e SummaryChallenges:• 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)
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e SummaryChallenges:• 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)
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e SummaryChallenges:• 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)
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e SummaryChallenges:• 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)
High luminosity ep/A-collisions reachable with proven technology
THANK YOU FOR YOUR ATTENTION
e
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Basic Refrigerator Layout
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DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e 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
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Synchrotron Radiation IR1 Degree
Power [kW]
critical energy [keV]
DL 13.9 118QL2 6.2 318QL1 5.4 294QR1 5.4 293QR2 6.3 318DR 13.9 118Total/Avg 51.1 163
e-
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Synchrotron Radiation IR10 Degree
Power [kW]
critical energy [keV]
DL 6.4 71QL3 5.3 308QL2 4.3 218QL1 0.6 95QR1 0.6 95QR2 4.4 220QR3 5.2 310DR 6.4 71Total/Avg 33.2 126
e-
DIS 2011, Newport News 12.04.2011Miriam Fitterer - LHeC Ring-Ring Design
e Main Ring Lattice ParametersBeam Energy 60 GeVNumb. of Part. per Bunch 2.0! 1010
Numb. of Bunches 2808Circumference 26658.8832 mSyn. Rad. Loss per Turn 437.2 MeVPower 43.72 MWDamping Partition Jx/Jy/Je 1.5/1/1.5Damping Time !x 0.016 sDamping Time !y 0.025 sDamping Time !e 0.016 sPolarization Time 61.71 minCoupling Constant " 0.5Horizontal Emittance (no coupling) 5.53 nmHorizontal Emittance (" = 0.5) 4.15 nmVertical Emittance (" = 0.5) 2.07 nmRF Voltage VRF 500 MVRF frequency fRF 721 MHzBunch Length 6.88 mmMax. Hor. Beta 141.94 mMax. Ver. Beta 138.43 m
123<Qx<2483<Qy<84
122.2 122.4 122.6 122.8 123.0
83.2
83.4
83.6
83.8
84.0
1 Deg10 Deg
possible working point
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