The first closure of the new VELO during beams was this morning. It reached 4 mm separation, so not completely closed.
2022 Operation
Re: 2022 Operation
After a few rocky attempts, yesterday evening the VELO was fully closed - congratulations LHCb!
Also, finally the 8b4e+BCMS hybrid filling scheme (a mix of 8b4e and "normal" bunch trains) was successfully tested, this could allow pushing the bunch intensity higher.
Also, finally the 8b4e+BCMS hybrid filling scheme (a mix of 8b4e and "normal" bunch trains) was successfully tested, this could allow pushing the bunch intensity higher.
Re: 2022 Operation
New record for instantaneous luminosity?
Jmc
Jmc
Re: 2022 Operation
Well, show's over for this year, as of 6am.
40 /fb delivered to ATLAS and CMS (target was 25 /fb)
Availability was fairly poor following the ion test, although the definite low-light of the year was the 4 weeks lost due to the cooling plant problem at point 4.
40 /fb delivered to ATLAS and CMS (target was 25 /fb)
Availability was fairly poor following the ion test, although the definite low-light of the year was the 4 weeks lost due to the cooling plant problem at point 4.
Re: 2022 Operation
I recall the target line was modified a few months back - was that the case?
Re: 2022 Operation
The actual lumi target (25 fb-1, the dashed orange line) was not modified.
However, with the long downtime in September, the schedule was updated, basically considering the period as a technical stop. Following that, the lumi prediction (green line) was re-generated with the new schedule.
In any case, both the target and the prediction were quite conservative, assuming an availability of 30%. In 2018, and in some weeks towards the end of this year, it was more like 60%.
However, with the long downtime in September, the schedule was updated, basically considering the period as a technical stop. Following that, the lumi prediction (green line) was re-generated with the new schedule.
In any case, both the target and the prediction were quite conservative, assuming an availability of 30%. In 2018, and in some weeks towards the end of this year, it was more like 60%.