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Lepton Collider (FCC-ee) PA31-1.0 Parameters (29 October 2021)

This page contains the FCC-ee PA31-1.0 parameters.

The FCC-ee lepton collider will be design to provide e+e- collisions with centre-of-mass energies from 88 to 365 GeV. The centre-of-mass operating points with the most physics interest are around 91 GeV (Z pole), 160 GeV (W<sup+W- pair-production threshold), 240 GeV (ZH production) and 340 - 365 GeV (ttbar threshold and above). The machine should accomodate at least two experiments operated simultaneously and deliver peak luminosities above $ 1 \times 10^{34} cm^{-2}s^{-1}$ per experiment at the ttbar threshold and the highest ever luminosities at lower energies.

The layout of the FCC-ee collider will be compatible with an energy frontier (order of 100 TeV) hadron collider (FCC-hh) that should be installed and operated after the end of the FCC-ee physics research programme.

The two parameter tables below show the preliminary machine parameters for different beam energies, considering four and two interaction points, respectively.

Parameter Unit Z WW ZH ttbar
Number of IPs   4
Circumference km 91.180
Bending radius of arc pole km 9.935
Energy loss/turn GeV 0.0391 0.0370 1.869 10.0
Synchrotron radiation power / beam MW 50
Beam energy GeV 45.6 80 120 182.5
Beam current mA 1 400 135 26.7 5.0
Bunches / beam # 8800 1320 336 42
Bunch population $10^{11} $ 2.76 2.17 0.64 1.49
Horizontal emittance $\epsilon_x$ nm 0.71 2.17 0.64 1.49
Vertical emittance $\epsilon_y$ pm 1.42 4.34 1.29 2.98
Arc Cell   Long 90/90 90/90
Momentum compaction $\alpha_p$ $10^{-6}$ 28.5 7.33
Arc sextupole families   75 146
$\beta^*{_x/_y}$ mm 150/0.8 200/1.0 300/1.0 1000/1.6
Transverse tunes/IP $Q_{x/y}$   55.543/55.600 100.543/99.600
Energy spread (SR/BS) $\sigma_\delta$ % 0.039/0.138 0.069/0.136 0.103/0.202 0.157/0.238
Bunch length (SR/BS) $\sigma_z$ mm 4.32/15.2 3.55/7.02 2.50/4.45 1.67/2.54
RF voltage 400/800 MHz GV 0.120/0 1.0/0 2.48/0 4.0/7.67
Synchrotron tune $Q_s$   0.0370 0.0800 0.0438 0.0890
Longitudinal damping time turns 1170 216 64.5 18.5
RF acceptance % 1.6 3.3 2.3 3.7
Energy acceptance (DA) % $\pm$ 1.3 $\pm$ 1.3 $\pm$ 1.7 -2.8 +2.5
Beam-beam ${xi_x}/{xi^a_y}$ nm 0.040/0.159 0.011/0.111 0.0187/0.0129 0.096/0.138
Luminosity / IP $10^{34} cm^{-2}s^{-1} $ 181 17.3 7.2 1.25
Lifetime (q + BS) sec   1142 2770
Lifetime (lum) sec 1136 1197 604 743
a) incl. hourglass

A pdf version of the version can be downloaded from HERE

Parameter Unit Z WW ZH ttbar
Number of IPs   2
Circumference km 91.180
Bending radius of arc pole km 9.935
Energy loss/turn GeV 0.0391 0.0370 1.869 10.0
Synchrotron radiation power / beam MW 50
Beam energy GeV 45.6 80 120 182.5
Beam current mA 1 400 135 26.7 5.0
Bunches / beam # 8800 1320 336 42
Bunch population $10^{11} $ 2.09 2.29 1.33 2.16
Horizontal emittance $\epsilon_x$ nm 0.71 2.17 0.64 1.49
Vertical emittance $\epsilon_y$ pm 1.42 4.34 1.29 2.98
Arc Cell   Long 90/90 90/90
Momentum compaction $\alpha_p$ $10^{-6}$ 28.5 7.33
Arc sextupole families   150 146
$\beta^*{_x/_y}$ mm 150/0.8 200/1.0 300/1.0 1000/1.6
Transverse tunes/IP $Q_{x/y}$   110.543/110.600 200.543/198.600
Energy spread (SR/BS) $\sigma_\delta$ % 0.039/0.103 0.069/0.121 0.103/0.155 0.157/0.203
Bunch length (SR/BS) $\sigma_z$ mm 4.32/11.4 3.55/7.02 2.50/3.75 1.67/2.16
RF voltage 400/800 MHz GV 0.120/0 1.0/0 2.48/0 4.0/7.67
Synchrotron tune $Q_s$   0.0370 0.0800 0.0438 0.0890
Longitudinal damping time turns 1170 216 64.5 18.5
RF acceptance % 1.6 3.3 2.3 3.7
Energy acceptance (DA) % $\pm$ 1.3 $\pm$ 1.3 $\pm$ 1.7 -2.8 +2.5
Beam-beam ${xi_x}/{xi^a_y}$ nm 0.054/0.160 0.014/0.125 0.0227/0.0134 0.106/0.139
Luminosity / IP $10^{34} cm^{-2}s^{-1} $ 181 19.5 7.48 1.31
Lifetime (q + BS) sec   1317 1412
Lifetime (lum) sec 2281 2130 1159 1417
a) incl. hourglass

-- JohannesGutleber - 2021-01-06

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Topic revision: r7 - 2022-02-03 - GhislainROY
 
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