ALICE CR07: Installation and Commissioning

21 Mar 2007 ALICE - Paul Dauncey 1

ALICE CR07: Installation and Commissioning

Paul Dauncey

Material from:

L. Leistam: “ALICE Status”

W. Riegler: “Commissioning and Installation”

K. Safarik: “Strategy for Data-Taking, Alignment and Calibration”


Installation: Recent Progress• Major milestones recently achieved

• SSD and SDD mounted on ITS frame• ITS frame lowered into pit and inserted

into TPC• Be beam pipe passed through and

connected to absorber

• Current status• Beampipe now in bake-out

•Bake-out period shortened• From 26 to 17 days• Assumes no leaks will be found


Integration: Constraints W. Riegler

NOW


• Installation in series means every detector is on the critical path• Every delay counts against the overall ready date

• Delays have built up over the last year• TPC was taken into pit in Mar 2006• Ready for ITS on 1 Feb; at CR06 this was 1 Oct• ITS was actually installed on 15 Mar• ITS delay due to SDD tests; cannot be fixed once installed

• Roughly 5 months delay since CR06, 1 month since Jan LHCC• “Luckily”, LHC schedule delayed by 4 months since CR06• Rest of delay compensated by breaking strict ordering for A-side forward

detectors

• Very little contingency left for planned detector• Would need to move to nights and/or weekends• Or not install some components

Installation: Comments


• V0, T0: 10-17 Apr• FMD3: 18-26 Apr

Installation: C-side Forward Detectors

• All thee detectors are ready for installation• Procedure tested in full in 2005; confident of this step


• SPD: 27 Apr – 2 May• Connections: 3-9 May

Installation: SPD, connection to ITS

• Most difficult part; pixel detector needs to be on time


• FMD2: 8-11 May• Services: 14 May – 7 Jun• TPC movement: 8-13 Jun• Beampipe: 14-21 Jun

Installation: Services, FMD, beampipe


• PHOS, one module: 22-25 Jun• EMCAL support: 26 Jun – 2 Jul

Installation: PHOS, EMCAL


• TOF, TRD modules 3-30 Jul

Installation: TOF, TRD

• Adds extra modules to existing installation• Realistically is contingency• End date won’t change even

if start date is later


• Miniframe: 31 Jul - 5 Sep

Installation: Miniframe

• Schedule Review in Sep recommended bringing this forward• At the expense of installation of other detectors• This recommendation was not taken up

• Critical milestone: carries services for almost all A-sides• No installed detectors can

read out on A-side until miniframe is in place

• LHC vacuum closes after installation; no time to fix anything


• V0, T0, FMD, PMD: 6-25 Sep• Shielding: 26 Sep – 9 Oct

Installation: A-side Forward Det, Shielding

• A-side forward detectors pushed after beampipe closure to make schedule; no apparent downside


• Critical: A-sides won’t connect until Sep• Not all services in place yet…• …although scheduled to be by the time the

relevant detectors arrive


L. Leistam


L. Leistam


• Services and power supplies• Services are not complete• CAEN power supplies are a “real concern”; still no real progress

• Space in the pit• Space is extremely tight for people working on the installation of detectors

and services

• Miniframe• Effectively a huge patch panel• Planned by subdetectors semi-independently; no overall plan shown

Commissioning: Issues


K. Safarik

Estimates 20k events for this


• Cosmics is an essential step before beam data• Only way to be sure all timing, event building, etc, is right• Otherwise, Nov beam will be used for commissioning, not calibration and

alignment

• Current plan is mainly parasitic running until Oct 10• Installation continuing• Installed detectors run as-and-when ready

• After this, full detector cosmics running can occur• 4 weeks scheduled, roughly half without magnet on, half with magnet on

• Alignment requires ~20k cosmic events in SPD• Rate is ~ 1/min; requires ~14 days• Completely fills allotted time• No spare time for actual commissioning of whole detector readout

Commissioning: Cosmics


• Installation:• Very significant progress• Whole schedule at risk from delays from all remaining detectors• Accurate up-to-date knowledge of the LHC schedule is essential• Coordination across subdetectors is good and well managed

• Commissioning• Individual subdetectors have done many tests in the lab• Need to increase as centralised activity in the pit• Lack of services, particularly on A-side will be a drawback• Cosmics are a valuable tool but are at risk of being lost as a contingency

buffer for any further schedule delays

• Recommend appointing a “Cosmics Manager”• To plan the cosmics running in detail (like the CMS MTCC)• To make sure it happens and the data are analysed

Conclusions

Documents

ALICE CR07: Installation and Commissioning