SQUIDs - Low Temperature Laboratory
SQUIDs - Low Temperature Laboratory
SQUIDs - Low Temperature Laboratory
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LLNL Axion Detector<br />
• Current system noise temperature: T S = T + T N ≈ 3.2 K<br />
Cavity temperature: T ≈ 1.5 K<br />
Amplifier noise temperature: T N ≈ 1.7 K<br />
• Time to scan the range of frequencies from f 1 to f 2 :<br />
τ(f 1 ,f 2 ) ≈ 4 x 10 16 (T S /1 K) 2 (1/f 1 –1/f 2 ) sec<br />
For f 1 = 0.24 GHz, f 2 = 2.4 GHz: τ ≈45 years<br />
• Note: There is only a factor of 2 to be gained in T S by reducing T<br />
unless T N is also reduced.
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