We tried to repeat the Vickers experiment today. The experimental setups were documented in photo. Hopefully we have better luck repeating it next time. The photos for this experiment are here. In the morning, we tried to reproduce the same experimental setup as in October 2008, but we put in the Elekta monitoring chamber by mistake. This extra element in the beam path caused some trouble in fitting all elements into the 119.2 cm space between exit window and chamber. We eventually managed to set up everything, only to found out that our previous data did not have Elekta monitoring chamber in the beam. Then we decided to run with Elekta chamber in first, since all Monte Carlo simulations to date were done with Elekta chamber in. The scanning chamber used was A16, connected through cable #2 to electrometer #29. The monitoring chamber is 2581, connected through cable #1 to electrometer #30. The Elekta chamber was connected through black cable to electrometer #27. Upon running the software, both electrometer #27 and #30 were showing zero bias voltage, and we decided to collect data from the two chambers only, discarding Elekta data. The results showed noisy data for 2581, likely due to the lack of bias. The magnitude of measurement is small, for 10s integration time and a relatively large chamber. Thus we need to fix the electrometers first before we can make further measurements. The data from this noisy scan showed broader distribution than previous measurement, which is expected due to Elekta monitoring chamber's scattering effect. The experiment was window only.
The oxygen sensor was showing overly high readings. Carl put in more electrolyte and it seemed to behave as expected now.
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