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 Wed Mar 20 22:18:28 2013, tara, Notes, RefCav, estimated beat frequency
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 Fri Apr 5 13:56:01 2013, tara, Notes, RefCav, estimated beat frequency
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Sat Apr 6 09:32:35 2013, rana, HowTo, TempCtrl, estimated beat frequency
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Mon Apr 8 15:15:06 2013, rana, HowTo, TempCtrl, estimated beat frequency
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Sun Apr 14 16:51:21 2013, rana, HowTo, TempCtrl, estimated beat frequency
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Message ID: 1144
Entry time: Mon Apr 8 15:15:06 2013
In reply to: 1143
Reply to this: 1147
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| Author: |
rana |
| Type: |
HowTo |
| Category: |
TempCtrl |
| Subject: |
estimated beat frequency |
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Isn't heating up one cavity enough? The goal is to keep the beat frequency constant, so we need to control the differential length between the two cavities. The first cavity can sit still, the second one can be heated up (for enough cooling rate). We plan to use a frequency counter to change beat frequency to the servo's error signal for feedback to the second cavity.
Anyway, I still have to check if both heaters are working or not.
| Quote: |
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I would have guessed that you heat both cavities. Unless they are both at an elevated temperature, how can you control their individual temperatures?
The cooling rate (and thus the bandwidth for control) is determined by the steady state temperature. I would guess that each cavity needs to be at least 35 C in order to have some headroom.
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