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| tempstability20180314 [2018/03/14 14:02] – hanany | tempstability20180314 [2018/03/14 14:15] (current) – robrient |
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| Several years ago, Shaul's student worked out the relationship between responsivity variations and focal plane heat bath variations for their thesis. {{::pages_from_sagiv_thesis2011.pdf|Pages from Sagiv_thesis2011.pdf}} | Several years ago, Shaul's student worked out the relationship between responsivity variations and focal plane heat bath variations for their thesis. {{::pages_from_sagiv_thesis2011.pdf|Pages from Sagiv_thesis2011.pdf}} |
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| The algebra looks sound, but we should double check the numbers, specifically the loop gain. | The algebra looks sound, but we should double check the numbers, specifically the loop gain and alpha. The student computed loop gain from a large value of alpha inferred from the data in Fig 7.2. I don't understand the experiment behind that, but the conclusion of 2800 seems very high, and inferred Loop Gain is thus high as well. The isolation of the detectors from focal plane drifts is very sensitive to this number, and smaller values of these parameters may not ensure as high an isolation. |
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| Here are some published figures on Loop gain from other experiments: | Here are some published figures on Loop gain from other experiments: |
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