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Table 3.1 Linear Colliders: Overall and Final Focus Parameters - 1 TeV (c.m.)

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Initial energy (c.m.) (GeV) 1000 800 1000 1000 1000 1000 1000 1000 1000 Initial energy (c.m.) (GeV)

RF frequency of main linac (GHz) 1.3 3 5.7 11.4 11.4 11.4 14 30 RF frequency of main linac (GHz)

7.48 27.5 3.25 6.4 5.53 10 10.4 9(7.5) 17.3 1.7-7.6 12.1

12.8 50 6.3 6.3 8.2 9.17 14.5 12.9(10.75) 13 11.5 2.20-10 27.2

Linac repetition rate (Hz) 5 3 50 50 150 120 120(100) 300 4000-1800 150 Linac repetition rate (Hz)

1.8 1.41 2.9 1.44 1.39 .7 1.1 .95 20 .8 .4

No. of bunches/pulse 2260 4500 50 72 85 75 95 1 1-10 154 No. of bunches/pulse

Bunch separation (nsec) 354 189 10 2.8 1.4 1.4 2.8 - .67 Bunch separation (nsec)

Beam power/beam (MW) 16.5 12.2 5.8 4.2 4 6.4 7.9 8.7 4.8 2.6-11.7 7.4 Beam power/beam (MW)

Damping ring energy (GeV) 4 3.2 3.15 2 1.98 2 2 1.98 3 2.15 1.98 Damping ring energy (GeV)

25/25 34/34 42/36 58/47 56/47.1 73/58 85/63 72.3/55 100/91 80/78 172/150

Total two-linac length (km) 58 30 33 26.6 21.8 18.7 18 14 17.6 10 Total two-linac length (km)

Total beam delivery length (km) 4 2.5 4 6 6 6.8 NA 4 2.4 10 (3TeV) Total beam delivery length (km)

14/.06 8/.01 10/.1 3.3/.05 3.3/.05 5/.05 4.5/.1 20/.08 3.9/.2 1.3/.02

25/.7 15/.3 32/.8 41/.1 30/.2 10/.1 25/.1 12/.15 200/.1 10/.18 10/.15

598/6.5 391/2 572/9 372/2.2 318/3.14 184/2.2 360/2.3 234/3.9 2000/2.7 200/6 115/1.75

500 300 500 120 200 90 100 120 750 200 30

Crossing Angle at IP (mrad) 0 3 6 8 6.1 20 20(8) 6 1 10 Crossing Angle at IP (mrad)

.2/14 .2/37 .26/16.2 .07/12.1 .16/15.9 .1/8.6 .05/7.6 .12/7.2 .2/165 .22/7.4 .05/3.37

1.64 1.8 1.68 1.32 1.6 1.42 1.35 1.46 2 1.32 1.86

Upsilon sub-zero .053 .06 .28 .5 .33 .27 .3 .12 .17 1.011 Upsilon sub-zero

Upsilon effective .053 .06 .29 .33 .27 .3 .15 .18 1.018 Upsilon effective

2.5 4.7 6.5 9.6 8.34 9 7.4 10.3 26.6 7.7 11.2

1.2 1.4 1.4 1.73 1.2 1.1 1.43 5 1.52 1.1

7.3 28 7.6 13.8 38.5 4.9 7 18.4 ? 10.4 3.4 11.1

.16 .19 .19 .55 .61 .19 .25 .33 ? 19.9 .13 .28

.66 .66 .8 5.3 3.5 1.9 2.3 2.3 ? 94.7 .95 4.4

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*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 and 5% in .

For the sake of uniformity, the nominal luminosity is simply defined as times the number of crossings per second, and in all cases assumes head-on collisions, no hour-glass effect and no pinch. The actual luminosity incorporates all these effects, including crossing angle where applicable. NLC and JLC calculations assume crab-crossing.

The 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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This page modifed: October 7, 1999 - 5:00 p.m. PDT - E. Mitchell