Bug #1030
Updated by Julie Roche 6 months ago
At 40 psia, Loop3 LH2 yields do not depend on fan frequency (neither do the LD2 rate): https://logbooks.jlab.org/entry/4303345. Loop 3 produces produce 5% more yield at 30 psia than at 25 psia( https://logbooks.jlab.org/entry/4296639 and https://logbooks.jlab.org/entry/4296687) and then 5% more from 30 to 35 psia (https://logbooks.jlab.org/entry/4300169) and then 5% more from 35 to 40 psia https://logbooks.jlab.org/entry/4300169. Loop 3 gives us more yields than Loop 2 at 11 uA for 58 and 42 Hz: https://logbooks.jlab.org/entry/4294810 No beam current dependence for Loop2 and Loop3 at 58 Hz: https://logbooks.jlab.org/entry/4295103. This feature is also seen in the target boiling data we took back in Sept 2023: https://redmine.jlab.org/issues/845#change-2067 Loop 2 - The issue is not an effect of the controller - https://logbooks.jlab.org/entry/4294867 Loop 2 - The issue subsides some when the fan is reversed, but running the fan reversed is unsustainable https://logbooks.jlab.org/entry/4292236 Loop2 yield decreases when fan speed increases https://logbooks.jlab.org/entry/4289172. ===== Comparison to DIS simulation: with the most ad-hoc tuning of Loop3 (42Hz, 30 psi)we get 80% of expected DIS rates on LH2 (97% on LD2, Loop 1, 50Hz, 25 psi). https://logbooks.jlab.org/entry/4297882 and here is a comparison between LH2 and LD2 https://logbooks.jlab.org/entry/4298838 ====== Loop2 target cell wall: data were taken during vaporization https://logbooks.jlab.org/entry/4293900 ====== There might be a constant ztarget shape difference between LH2 and LD2 throughout the NPS data taking: https://logbooks.jlab.org/entry/4293600.