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Refer to appendix for other data sets for CP2.6.
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jvdoorn committed May 26, 2023
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In an attempt to fix the `noise' caused by the feedback loop, we turned off the magnet. Unfortunately, it never turned back on as the magnet controller was apparently broken. A downside of this, is that we were also no longer able to read out the value of the field. Since we had no magnetic field any more, the most reasonable measurement to perform was measuring the CPR. We did so by using a constant bias of \qty{380}{\micro\ampere} for the dc-SQUID, sweeping a current through the junction loop and then measuring the voltage over the dc-SQUID. It should be mentioned that during these measurements there appeared to be a lot of drift causing measurement to differ widely. We suspect that an external magnetic field was responsible for this.

In Figure~\ref{fig:CP2.6B_SQUID_voltage_over_total_current} we see the raw data from one of the CPR measurements. We note a clear periodicity in the signal of around \qty{200}{\micro\ampere} and a somewhat linear trend on top of that. We present this specific measurement because it has no jumps in the dc-SQUID voltage, has a sufficiently small sample spacing, covers a wide enough range to see several periods and measured both positive and negative currents. Different sample spacings did not affect measured periodicity.
In Figure~\ref{fig:CP2.6B_SQUID_voltage_over_total_current} we see the raw data from one of the CPR measurements. We note a clear periodicity in the signal of around \qty{200}{\micro\ampere} and a somewhat linear trend on top of that. We present this specific measurement because it has no jumps in the dc-SQUID voltage, has a sufficiently small sample spacing, covers a wide enough range to see several periods and measured both positive and negative currents. Different sample spacings did not affect measured periodicity. For transparency we have included a few other data sets in Appendix~\ref{app:CP2.6B-data}.

\begin{figure}[ht!]
\centering
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