In the weekend after the experiment e775s (7-8 March 2020) a problem with the cooling system of Mugast occurred. In particular, in the morning of Saturday 7th around 12h the cooling system tripped and some detectors remained switched on until Monday 9th in the morning. After a check, it looks like all Mugast detectors are ok except MG6, which cannot be biased anymore.
The alpha calibration run of the weekend (run_0193) is divided into 55 runs. Runs from .0 to .11 can be safely used for the post-experiment alpha calibration, those from .12 to .54 are probably useless to this aim.
In the first attachment is the evolution of the DSSD energy (of all telescopes together because it's the calibrated energy) for run .12, that started on Saturday 7th at 11.43 and ended at 12.55. At the end of the run it is evident that something wrong is going on with the detectors. In the following runs this behaviour is confirmed and going even worse.
In the second attachment is the evolution of the DSSD energy for MG6 and for MG1 in run .13, so right after the cooling system tripped, showing that MG6 immediately "suffered" much more the heating-up.
In the last 2 attachments are the raw energies for X and Y of MG11 in run 0524 done on Monday 9th afternoon after we re-biased the detectors compared with run 0193 (from .9 to .11) before the cooling system tripped. It looks like the part of MG11 X from strip 35 to 50, that before the heating was having the 4-peaks behaviour, now behaves normally, while the Y is still the same, with 3 missing strips. |