SRF Cavity BCS Surface Resistance Calculator
Particle accelerator physics: Calculate bulk niobium Superconducting Radio-Frequency (SRF) cavity surface resistance ($R_{\text{BCS}}$ and $R_{\text{res}}$), unloaded quality factor ($Q_0$), and $2.0\text{ K}$ cryogenic RF heat dissipation.
SRF Cavity RF Parameters & Bath Temp
Standard TESLA / LCLS-II / ILC: 1300 MHz
Superfluid He-II: 1.8–2.0 K
State-of-the-art N-doping: 2–5 nΩ
Elliptical TESLA-type cavity: 270 Ω
Accelerating Field & Gradient
Typical CW / Pulsed: 16–35 MV/m
9-cell 1.3 GHz TESLA: 1.038 m
Geometric shunt impedance
Cavity Q-Factor & Cryogenic Heat Output
Unloaded Quality Factor Q_0:
--
dimensionless (× 10¹⁰)
Total Surface Resistance R_s:
--
nano-ohms (nΩ)
BCS Resistance R_BCS:
--
nΩ (temperature dependent)
Cryogenic Dissipated RF Power:
--
Watts dissipated into 2 K bath
| Total Accelerating Voltage V_acc: | -- |
| Peak Surface Magnetic Field B_pk: | -- |
| Estimated Cryoplant Electric Grid Power: | -- |
| SRF Surface Performance Rating: | -- |
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