2022 Operation

The place to discuss the LHC. Commissioning, operation, issues, events ....
dukwon
Posts: 148
Joined: Fri Apr 10, 2015 1:04 pm
Contact:

Re: 2022 Operation

Post by dukwon » Thu Oct 06, 2022 8:31 am

Tau wrote:
Thu Oct 06, 2022 7:34 am
Does that mean VELO wasn't in until now?
The first closure of the new VELO during beams was this morning. It reached 4 mm separation, so not completely closed.

M.
Posts: 20
Joined: Thu Apr 07, 2022 10:54 pm

Re: 2022 Operation

Post by M. » Sat Oct 22, 2022 12:59 am

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.

jmc2000
Posts: 158
Joined: Sun May 08, 2011 2:51 pm

Re: 2022 Operation

Post by jmc2000 » Thu Nov 24, 2022 11:19 pm

New record for instantaneous luminosity?

Jmc

dukwon
Posts: 148
Joined: Fri Apr 10, 2015 1:04 pm
Contact:

Re: 2022 Operation

Post by dukwon » Mon Nov 28, 2022 3:28 pm

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.

User avatar
trobbins
Posts: 23
Joined: Sun May 20, 2018 12:25 am

Re: 2022 Operation

Post by trobbins » Wed Nov 30, 2022 2:24 am

I recall the target line was modified a few months back - was that the case?

M.
Posts: 20
Joined: Thu Apr 07, 2022 10:54 pm

Re: 2022 Operation

Post by M. » Thu Dec 01, 2022 7:16 am

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%.
Attachments
bokeh_plot.png

Post Reply