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Lena/Sep 2016: Difference between revisions
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* After replacing the fiber connector with the plastic one, the probe beam appear to become spontaneously imbalanced every few seconds. Most of the time it works fine, but sometimes it starts this weird behaviors. It's unclear if it's the connector, or the laser, or the electronics.
== 09/22/2016 ==
Thursday group meeting.
Zack showed new custom-made non-magnetic fiber connectors. They are improved compared to the previous version, so that they can be cleaned without taking the fiber out and exposing the bare glass. It's important because that's how we broke our fiber the last time and had a downtime of over a week. We have a few dozens of them, and they are machined in the machine shop downstairs.
The field that we have in the magnetically shielded room drifts a lot. The full range of our device is approximately 0.5-1.0 nT (±10 V ADC input at 10-20 μV/fT) Thad proposed to use a 3-axis fluxgate to stabilize the field and keep it within the range.
Thad also proposed to increase amplitude of the calibration chirp at higher frequencies in order to have a better S/N for higher frequencies. I think it would be easier to increase the duration of the chirp at these frequencies, because the amplitude is already fairly close to the maximum.
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