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Calculator

Fridge attenuation noise

The output widget follows the Matplotlib attenuation/noise script: noise at the MXC plate, stage attenuation bars, and one slider per fridge stage.

Output

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Equations

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Stage

Ai=10ai/10A_i=10^{a_i/10}
nˉT(T,ν)=1exp⁡(hν/kBT)−1\bar n_T(T,\nu)=\frac{1}{\exp(h\nu/k_BT)-1}

Cascade

nˉ0=nˉT(300 K,ν)\bar n_0=\bar n_T(300\,{\rm K},\nu)
nˉi=nˉi−1Ai+Ai−1AinˉT(Ti,ν)\bar n_i=\frac{\bar n_{i-1}}{A_i}+\frac{A_i-1}{A_i}\bar n_T(T_i,\nu)

Readout

nˉMXC(ν)=nˉN\bar n_{\rm MXC}(\nu)=\bar n_N
atot=∑iaia_{\rm tot}=\sum_i a_i

Source artifact: widgets/fridge_attenuation_noise.py.

Reference