Commissioning and running of sPHENIX

[Stefan Bathe <stefan.bathe AT baruch.cuny.edu>]

Minutes shift change 2023-05-18

general
—————

First look at collisions last night with MBD on minimum bias trigger

- beam not re-bucketed:  wide time distribution

- large time distribution offset:  large fraction of junk triggers?

- there seem to be issues with beam clock—>investigating

- will try the same again tonight

new beam-call list (linked from run web page)

- please enter your requests to be called

Remote work

- apparent issue with remote GTM use last night

- we are in operations mode:  any subsystem work should be done in control room or after prior authorization by shift leader (single point of contact)

Plan

- rebucketing during day (no collisions for us)

- overnight:  stores for STAR

- will try to time in MBD again tonight

- if all goes well, from tomorrow morning:  collisions for sPHENIX commissioning 24/7

- if MBD timed in, next will be calorimeter timing in and data taking, analysis (Friday, weekend)

  - in addition to trigger, DAQ, and MBD experts, will need calorimeter experts

approval

- indication will get approval today or tomorrow, probably tomorrow

- if that happens will start magnet cool down (cryo group)

- one valve on berm, fenced, coordinate with nitrogen

- start gas

  - need access to adjust nitrogen flow meter

  —> needs coordination

first controlled access

- lost sweep

when remove equipment:  call Health Physicist

evening (Sasha)

- quiet shift

- no access, injecting losing 

- no alarms

night (Brett)

- exciting shift

- first look at collision

- had to re-launch DO GUIs

  - Valery started 

Day (Ben)

- continued on some of issues with GUIs

- contacted experts

- dumped beam around 8:00am

- access 1:00pm

- lost sweep

- just finished sweep

MBD (Mickey)

- later on it seemed clock was getting unstable

HCAL (Oliver)

- shared slide

- increased bias current in iHCal, not oHCal, potential radiation damage

EMCal (Sean)
- one problem with one interface board:  LV leg out

  - power cycling, if not access tomorrow


TPOT (Hugo)

- DAQ issues, event builder was in funny state, probably due to GTM instability, had to reboot multiple times

- once TPOT:  need commissioning time without collisions

TPC (Takao)

- last night continued number of samples to read out:  achieved 256 samples, 50 Hz logging rate

  - number of links to FEEs reduced over time (maybe single event accept issue)

INTT (Raul, Itaru)

- getting ready for big partition

  - needs Martin

  - waiting for nitrogen

MVTX (Cameron)

- nothing major on hardware

- couple of tasks once we have access, but waiting for gas and waiting for part

- monitoring:  in touch with shift crew, working

- need time for development without beam

  - schedule

- when is a good time to turn on whole detector

sEPD (Rosi)

- installation meeting today

- target goal:  July 14 (around maintenance day)

- Gunther:  how much lead time needed?

- couldn’t do much earlier (availability of parts and labor)

- it’s not all going to go in at the same time (disks can go in earlier)

DAQ (Martin)

- set up DAQ Operator station

- should run DAQ from that computer only when GTM in global mode

- when done:  don’t let RC hang around:  get out of it and terminate it

Trigger (Dan)

- last night MBD trigger triggered on NS coincidence

- this was Lemo cable 3 tubes each

- goal is to time in trigger more appropriately

- add LL1 to big partition tonight:  debug vertex issues better

- goal is to switch to fiber input as soon as possible

ZDC (Peter)

- taking data after 2:00am with John’s scope

- wrong mode:  not enough data

- no single neutron peak yet

- try to do the same with more data tonight

- 

---------------------------------------------------------------------------------
Stefan Bathe
Professor of Physics
Baruch College, CUNY
and RIKEN Visiting Scientist

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
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