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Pre-linacs, Damping Rings and Main Linac Parameters - 500 GeV (c.m.)
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information for Table 1.2 		TRC
12/95		 Updated*
8/98		 TRC
12/95		 Updated*
10/96		 TRC
12/95		 Updated*
9/99		 TRC
12/95		 TRC
12/95		 Updated*
8/98		 TRC
12/95		 Updated*
10/96		 TRC
12/95		 Updated*
9/99
Pre-linacs Pre-linacs
First stage energy (GeV) 4 3.2 3.15 1.98 1.98 2 1.98 3 2.15 1.98 First stage energy (GeV)
Second stage energy (GeV) - - 20 10 10-20 10 10 - 9 Second stage energy (GeV)
Beam energy to make (GeV) 250 250 10 10 3-6 6 150 2.15 1.98 Beam energy to make (GeV)
Damping Rings Damping Rings
pre-damping ring energy (GeV) - - 1.98 1.98 2 1.98 - 2.15 1.98 pre-damping ring energy (GeV)
damping ring energy (GeV) 4 3.2 3.15 1.98 1.98 2 1.98 3 2.15 1.98 damping ring energy (GeV)
Ring circumference (m) 20,000 17,000 650 321 277 223 300 160 283 264 Ring circumference (m)
20/20 35/35 3.8/3.8 3.5/4.3 4.0/5.2 4.1/4.6 5.1/5.1 1.8/2.9 10.5/10.5 8.7/8.7
Number of bunches per ring 800 2820 125 333 288 340 360 285 3 4810 7154 Number of bunches per ring
Bunch length (mm) 10 6 3.6 5 5 4.1 4 9.8 1.8 3 Bunch length (mm)
20/1 8/.02 10/.5 5/.25 3.3/.05 3.3/.05 2.5/.03 3/.03 45.5/.45 2.5/.04 1.6.01
Main Linacs Main Linacs
RF frequency (GHz) 1.3 3 5.7 11.4 11.4 11.4 14 30 RF frequency (GHz)
Unloaded/loadedgradient (MV/m) 25/25 21.7/21.7 21/17 40/32 44/34 73/58 50/37 72.3/55 100/91 80/78 172/150 Unloaded/loaded gradient (MV/m)
Active two-linac length (km) 20 23 30.2 15.7 12.8 8.7 14.2 9 5.8 6.3 3.6 Active two-linac length (km)
Total two-linac length (km) 29 30 33 32 18.8 16 10.4 15.6 10.5 7 8.8 5.0 Total two-linac length (km)
Total number of klystrons 604 616 2517 4356 3560 3320 3936 3312 1400 2 364 Total number of klystrons
Total number of modulators 604 616 2517 2178 3560 3320 1970 1656 140 NA 182 Total number of modulators
Klystron peak power (MW) 8 150 48 50.3 135 50 75 150 NA 50 Klystron peak power (MW)
Klystron repetition rate (Hz) 10 5 50 100 150 180 120(100) 300 2530/1210 200 Klystron repetition rate (Hz)
1315 1330 2.8 2.4 .5 1.2 1.55 .5 .0116/.00176 16.7
Pulse compression ratio - - 5 2 5 4 4.55 3.2 - 32(beam) Pulse compression ratio
Pulse compression gain - - 3.5 4 1.96 3.83 3.4 3.2 - 32(beam) Pulse compression gain
1315 2.8 .48 .49 .23 .24 .37 .11 .0116/.00176 .13
Number of sections 19328 19712 5034 8712 7120 6640 7872 4968 5600 22466 6940 Number of sections
Section length (m) 1.04 6 1.8 1.31 1.8 1.8 1 .280 .5 Section length (m)
a / (range if applicable) .15 .16/.11 .16/.12 .173/.125 .20/.14 .22/.15 .216/.146 .14 .2 .225/.175 a / (range if applicable)
Total AC power to make rf (MW) 164 95 139 140 139 130 114 103 100(83) 57 100 100 Total AC power to make rf (MW)
Wall plug beam efficiency (%) 20 23 10.7 10.4 4.6 4.6 5.6 8.2 8.9 8.4 1.6/7.8 9.8 Wall plug beam efficiency (%)
Click here TESLA SBLC JLC (C) JLC (X) NLC JLC/NLC** VLEPP CLIC**
to update your machine
information for Table 1.2 		TRC
12/95		 Updated*
8/98		 TRC
12/95		 Updated*
10/96		 TRC
12/95		 Updated*
9/99		 TRC
12/95		 TRC
12/95		 Updated*
8/98		 TRC
12/95		 Updated*
10/96		 TRC
12/95		 Updated*
9/99

*If a number does not appear in the updated column, this means that the number in the TRC column still holds.

**Numbers in ( ) under JLC/NLC correspond to 100 Hz repetition rate; numbers in ( ) under CLIC correspond to a
20% dilution in sigma_sub_y and 5% in sigma_sub_x.

The main linac loaded gradient includes the effect of single-bunch (all modes) and multibunch beam loading, assuming that the bunches ride on crest. Beam loading is based on bunch charges in the linacs, which are slightly higher than at the IP.

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