H6/H8 iteration

Monday 6 Mar 2023, 10:00 → 11:00 Europe/Zurich

10:00 → 10:30 Discussion

General remarks and recommendations in the minutes of this contribution.

Notes discussion Barabara H6/H8

Present: D. Banerjee, A. Baratto Roldan, J. Bernhard, M. van Dijk, B. Holzer,  M. Lazzaroni, L. Nevay.

General notes
-EA team requested feedback on the assignment of the main user, one at any given point in time in each beamline. BH noted she will add this in the next iteration of the schedule, when there is more clarity on who will be where and when. 
-Regarding the wobbling, the polarity received in H6/H8 is tied together. The standard wobbling configurations are (units in GeV/c) in H6/H8, are +120/+180 (standard), -300/-120. 
-DB noted that during high intensity week (EP pixel in H6) the standard positive wobbling configuration is preferred. 
-JB noted that for the negative wobbling -120/-300, the electron rate in H8 is basically non-existent and cannot be used for calorimeter calibration. 
-BH noted that she sent some performance plots of H8 made by ATLAS TILECAL to ALICE FOCAL, MPGD TRD and POKER. 
-BH noted that the beamline meetings with the users can be organized for H2/H4 and the East Area, but for H6/H8 should wait until after the schedule is more complete.

 

H6, week 19 - CERF. For the run of CERF DB noted that there can be no access downstream of CERF and no installations during their runtime.

H6, week 20 - ALICE ITS3. DB noted the presence of this user during high intensity week, BH replies this is as requested by the user. DB noted that during this time (high intensity week), the zone will be supplied with the standard 120 GeV/c beam, it will not be possible to supply tertiary beam.

H6, week 20 - ATLAS MALTA. BH noted this user MALTA would likely like to stay some additional weeks as parasitic user.

H6, week 21 - CMS MTD. The user requested an AIDA telescope, should be placed in PPE156, where this device is located. AIDA INNOVA in week 21 and CMS Pixels in week 28 also requests AIDA telescope. They cannot be scheduled together with MTD for the weeks they need AIDA.

H6, week 26-27 - EXFLU. DB noted the user has requested 24-300 GeV/c, only up to 120 GeV/c can be supplied. BH asked for input on the best location for this user, DB replied that it depends on how often they need to access their setup, if this is not very frequent then PPE146 would be suitable.

H6, week 32 - MEDIPIX. DB noted the user requested momenta up to 200 GeV/c, only up to 120 GeV/c can be supplied. The user is planned as "parallel" in the draft schedule.

H6, week 33 - EIC dRICH. This user is currently placed in PPE156, DB suggested they could be placed in PPE146, just before MALTA. If ACONITE is moved out (has been done in the past for ALICE FOCAL), the vacuum can then be completed up to this location, allowing for better electron beams. However, H6 only has one XCET. Last year the user was placed in H8, where they used all three XCETs for PID. In case the user requires this kind of tagging, placement in H8 would be more suitable.

H6, week 34 - MONOLITH. DB noted the user requested 180 GeV/c, only up to 120 GeV/c is available in H6.

 

Regarding H8, BH requested feedback on the MADMAX schedule, which is now recorded in the minutes:

     

	Start	Finish
Morpurgo cooling	06-03-2023	27-03-2023
Morpurgo ramping	27-03-2023	28-03-2023
MADMAX run 2023	28-03-2023	17-04-2023
MADMAX G10 test	17-04-2023	21-04-2023

H8, week 16-18 - SELDOM. JB noted that this user requested 400 GeV/c primary beam, which cannot be given (priority goes to NA62 as a running experiment). They also requested the use of both PPE128 and PPE138. The use of PPE128 is fine, but they should accept to be secondary priority to LHCb, and likely the use of PPE138 (aside from a small setup) is too much. Beam will be whatever is selected by LHCb.

H8, week 21-22 - SND. JB noted that they requested up to 350 GeV/c. The limits of H8 are 180 GeV/c for positive beam or 300 GeV/c for negative beam. DB confirmed the H6 users in this period would be OK with the -120/-300 wobbling configuration. JB noted that in this case the user could also be moved upstream, if they want. ML suggested that PPE138 and PPE168 are the options due to the requirement for crane access (4t of iron blocks in setup). BH noted the user requested PPE168, where they were last year.

H8, week 23 - GALORE. For this request, JB noted that crystal tests are usually placed in PPE128, and suggested to move the users there. It is noted that this beam request seems to be an extension of SELDOM. There is no crane access in PPE128, so suitability depends on size of user setup.

H8, week 25 - EP FTS. BH noted that this part of the beamtime regards only the non-electron part of their request. JB: The beam request indicates they would like 20-100 GeV/c hadrons, which is incompatible with LHCb and UA9 who take 180 GeV/c. It would be better to move this user a week later, overlapping with IDEA DRC.

H8, week 26 - IDEA DRC / UA9. IDEA DRC wants a scan, and UA9 needs fixed energy. BH noted that in this week, UA9 is parasitic. ABR added that IDEA DRC wants electrons. JB noted that in this case, this slot does not work for UA9. JB noted that possibly UA9 could be moved to week 32, together with AMS, or otherwise another week towards the end of the run.

H8, week 29 - MPGD TRD. JB noted that this is a surprising request since it seems transition radiation works well only above 100 GeV/c, and noted it could be useful to contact the user to ask exactly what they intend to measure. JB added that in case they want better beam and rate, PPE138 is preferable, if they want a better ability to tag the particles they should be in PPE158 (only one XCET is upstream of PPE138), to be checked with the user.

H8, week 30 - POKER. JB noted that since POKER is a test for NA64, it could be considered to combine their beamtime with that of the rest of NA64. In any case, the pure electrons as requested cannot be given in H8. JB added that in case they want better beam and rate, PPE138 is preferable, if they want a better ability to tag the particles they should be in PPE158 (only one XCET is upstream of PPE138), to be checked with the user.

H8, week 31-32 - QFIB. In the second week, ATLAS ITK PIXEL will be running, requiring the MORPURGO magnet. The beam will be deflected. It is suggested to move QFIB upstream by one week (week 30-31) so there is no overlap with the MORPURGO run.

H8, week 32-33 - ATLAS ITK PIXEL. Regarding the time requested by them in H8, using the MORPURGO magnet. JB suggested it would be preferable to plan this run as close as possible to the MADMAX run, to minimize the time for which the magnet is cooled and/or to avoid an additional warmup and cooldown. For users located downstream while the magnet is powered, it should be noted the beam will be deflected by MORPURGO. The STRAW TRACKER located behind the dump should be minimally affected although they will see the beam shift slightly.

H8, week 34 - ALICE FOCAL. JB noted that the user requested pure electrons, which cannot be given in H8. In negative wobbling, there are virtually no electrons at high energy, tests of last year have shown. The users also requested beams up to 350 GeV/c which cannot be done in H8. It could be possible to go to the negative wobbling -120/-300, but this would affect the H6 users (high intensity week). In this case, H6 would get 120 GeV/c negative beam, will require more open collimators and suffer from increased beamsize.

H8, ion run - all users. JB noted they can only be placed in PPE138.

H2, ion run - all users. NC noted they can only be placed in PPE152.

H4, ion run - all users. NC noted they can only be placed in PPE134.