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Lena/Dec 2016: Difference between revisions
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# purple, gray = Z coil
# black, white = thermoresistor
== 12/09/2016 ==
Tested the polarimeter boards assembled by Alec. Most boards work, there are a few connectivity issues with the ones that don't work. Realigned the magnetometer and verified it works with the new Helmholtz system.
== 12/12/2016 ==
Found a bug in the FPGA firmware that affected the single channel magnetometer setup in Chamberlain. It prevented chrips from coming out due to a race condition. Making a measurement with the buffer gas cell to verify the new coils work correctly.
Resistor values in the current source in Chamberlain and WIMR are: 50 Ω, 50o Ω, 1 kΩ, 5 kΩ. The values in the chamberlain magnetometer VI have to be multiplied by 2 because of how the circuit is designed.
=== Buffer gas cell runs ===
* Run 09
** Noise 0 - magnetic field noise (other two didn't work)
* Run 14 (Rcell = 153 Ω)
** Noise 0 - magnetic field noise (5-10 fT/sqrt(Hz))
** Noise 1 - probe noise (2 fT/sqrt(Hz))
** Noise 2 - technical noise
The data is consistent with the previous measurements in Chamberlain
=== OTS cell runs ===
* Run 15 (Rcell = 146.5 Ω, Iprobe = 50 uA/V * 2V * 2ch)
** Noise 0 - magnetic field noise
** Noise 1 - probe noise
** Noise 2 - technical noise
The performance is similar to Run 14, the OTS cell seems to have higher bandwidth? This is opposite to what I expected from this cell.
* Run 16 (Rcell = 146.5 Ω, Iprobe = 50 uA/V * 2V * 2ch)
Probe noise is 5 fT/sqrt(Hz)
* Run 17 (Rcell = 146.9 Ω, Iprobe = 50 uA/V * 4V * 2ch), doubled probe power
** Noise 0 - magnetic field noise
** Noise 1 - probe noise
(noise floor increased)
* Run 18 (Rcell = 147.1 Ω, Iprobe = 50 uA/V * 1V * 2ch)
** Noise 0 - magnetic field noise
** Noise 1 - magnetic field noise
** Noise 2 - probe noise (5 fT/sqrt(Hz))
** Noise 3 - technical noise (0.5 fT/sqrt(Hz))
* Run 19 (Rcell = 142.4 Ω - 140.6 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 20 (Rcell = 139.4 Ω - 138.5 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 21 (Rcell = 137.9 Ω - 137.3 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 22 (Rcell = 136.7 Ω - 136.0 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 23 (Rcell = 134.3 Ω - 133.8 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 24 (Rcell = 132.9 Ω - 131.4 Ω, Iprobe = 50 uA/V * 2V * 2ch), disabled FPGA lowpass filter in this and the following runs
* Run 25 (Rcell = 130.5 Ω - 129.7 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 26 (Rcell = 129.0 Ω - 128.2 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 27 (Rcell = 127.7 Ω - 126.9 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 28 (Rcell = 125.6 Ω - 125.1 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 29 (Rcell = 124.5 Ω - 124.0 Ω, Iprobe = 50 uA/V * 2V * 2ch)
* Run 30 (Rcell = 122.6 Ω - 122.0 Ω, Iprobe = 50 uA/V * 2V * 2ch)
== 12/13/2016 ==
== 12/14/2016 - measuring a patient ==
== 12/16/2016 ==
== 12/19/2016 ==
== 12/20/2016 ==
== 12/22/2016 - OTS cell tests summary ==
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