Table 3 Parameters used in the sensitivity curve.
From: The design strain sensitivity of the schenberg spherical resonant antenna for gravitational waves
Description | Value |
|---|---|
Thermodynamic Temperature | \(T=100\) mK |
Sphere mechanical Q | \(Q=1\times 10^7\) |
Resonator 1 mechanical Q (transducer first mode) | \(Q_1=1\times 10^6\) |
Resonator 2 mechanical Q (transducer second mode or membrane mode) | \(Q_2=1\times 10^5\) |
Transducer central frequency | \(F_T=3206.3\) Hz |
Transducer minus frequency | \(F_-=3172.5\) Hz |
Transducer plus frequency | \(F_+=3240.0\) Hz |
Pump frequency | \(F_\text{pump}=1\times 10^{10}\) Hz |
Electric coupling constant | \(\beta _\text{e}=0.65\) |
Frequency shift due to the displacement of the transducer membrane | \(\frac{df}{dx}=7.26^{14}\,\text{Hz}/\text{m}\) |
Pump oscillator incident power | \(P_\text{inc}=1\times 10^{-10}\) W |
Amplifier noise temperature | \(T_\text{amp}=10\) K |
Electrical quality factor of the transducer cavity | \(Q_\text{e}=3.8\times 10^5\) |
Phase noise spectral density | \(S_\text{p}=1\times 10^{-13}\) dBc/\(\text{Hz}\) |
Amplitude noise spectral density | \(S_\text{a}=1\times 10^{-14}\) dBc/\(\text{Hz}\) |
Loss in the microwave transmission line between transducer and amplifier | \(L_\text{amp}=5\) |
