Superconducting RF Cavities
(Version 1.3)
b = 0.61
Section
Cavity geometry
33 cavities, 11 cryomodules
Microphonics:
- Normal operation: Gaussian distribution with s
= 9 Hz.
- Noisy operation: Gaussian distribution with s
= 17 Hz, contol system capable to 6 s
Peak surface field:
- Reference design: 27.5 MV/m for all cavities.
- JLab goal: Uniform distributuion centered about 27.5 MV/m, +
2.5 MV/m
- Expected operation mode: One cavity missing
Ep / E0
= 1.87 ( average over cavity )
Bp / Ep
[mT/(MV/m)] = 2.1 (all cells)
R / Q = 279 Ohm at b
=0.61, = 303 Ohm at b =0.61
G = 176.533 Ohm ( = geomtery
factor Q x R)
k [%]
= 1.61 (cell-to-cell coupling coefficient)
QBCS @ 2K
= 27.36 x 109
Frequency [MHz] = 805
Field Flatness [%]= 2.5
Lorentz-force detuning KL70
= -2.9 Hz/(MV/m)2 (Lorentz detunning cofficient with stiffeners
at 70 mm)
KL80 = -3.4 Hz/(MV/m)2
(Lorentz detunning cofficient with stiffeners at 80 mm)
Nb thickness = 3.8 mm
Active cavity length = 0.68151
External Q = 5 x 105, + 20%
b = 0.81093
Section
48 cavities, 12 cryo modules (tunnel has space for 21 cryo
modules)
Lorentz detuning: K = 1 Hz/(MV/m)2
Microphonics:
- Normal operation: Gaussian distribution with s
= 9 Hz.
- Noisy operation: Gaussian distribution with s
= 17 Hz, contol system capable to 6 s
Peak surface field:
- Reference design: 35 MV/m for all cavities.
- JLab goal: 35 MV/m, +2.5, -7.5 MV/m
2.5 MV/m
- Expected operation mode: One cavity missing
Ep / Eo = 1.69 (interior cell)
Bp / Ep = 2.15 (mT/MV/m)
Active cavity length = 0.90496
External Q = 5 x 105, + 20%
QBCS at 2 K ~ 34.8 x 109
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