experimental beampipes: status and outlook ray veness / at-vac for the beampipe team with many...
TRANSCRIPT
Experimental Beampipes:Status and Outlook
Ray Veness / AT-VACFor the beampipe team
With many thanks to the experiment’s installation and coordination teams
LEMIC 29 IV 08 Beampipe Status - R.Veness
Contents
o Last update to LEMIC in October 07o ATLAS central section installations
o VAX zones
o Recent activitieso Major installations in ATLAS and CMS
o Looking forwardo Access to chambers for NEG activation or removal
o Consolidation activities
o AT-VAC structure
o Summary
LEMIC 29 IV 08 Beampipe Status - R.Veness
ATLAS:Lab activities
o LUCID Integrationo Both LUCID detectors have been
integrated in between the VJ chamber and support by the LUCID/VAC team
o VJ assemblies ready for installation in B.927
o Bakeout test (Jan ’08)o Half-length of ATLAS, fully NEG-
coated, comprised of reserve chambers and supports
o Tested NEG activation procedure, bakeout performance and support displacements due to thermal expansion
o Also tested thermal load on LUCID with cooling during bakeout
o No problems seen
Integration of LUCID onto VJ in B.927
Bakeout test in B.927
LEMIC 29 IV 08 Beampipe Status - R.Veness
ATLAS: Cavern activities
o VJ installation test (Jan ’08)o VJ assembly with dummy LUCID was
installed in the cavern
o Initial leak problems with TAS seal disappeared after few days
o Envelope conflicts discovered with forward shielding – being resolved
o Gas Injection Systemo Table + Injection Line + Pumping
Line are all installed and being commissioned
o baking, test of all instrumentation and connection to PVSS – Should be completed tomorrow
VJ reserve chamber installed in ATLAS
LEMIC 29 IV 08 Beampipe Status - R.Veness
ATLAS: Cavern Activities (2)
o Bakeout heater testing (in progess)o ATLAS bakeout jackets integrated into
chambers
o Permanent cabling down to cavern racks
o detector closed during first bakeout, so no access to heaters
o Tests to verify heater and thermocouple connections before endcap closure
o Also test interlocks with PIXEL thermal control system
o Remaining activitieso Closing of endcaps around chambers
o VT and VJ chambers (installation and test) plus final commissioning
o 38 days of VAC activities before ready-for-beam (2 July by current schedule) VA chamber installed in ATLAS
LEMIC 29 IV 08 Beampipe Status - R.Veness
ALICE
o RB24 installationo RB24 (non-experimental side) chambers and supports are
being installed
o ALICE final commissioningo RB 24 NEG activation week 21 (19/5)
o ALICE ultra-pure gas pumping week 22 (26/5)
LEMIC 29 IV 08 Beampipe Status - R.Veness
CMS:Lab Activities
o Reserve chambers ready and NEG coated:o Central pipe (stainless steel)
o HF/CT2 (NEG coating in progress)
o Forward pipe
o NO SPARE for End-cap pipe
o Installation toolingo Lifting beams and installation tooling all ready (and now in use!)
o Common Be spare sectiono The prototype 1m long x 58mm ID beryllium chamber has been
re-fitted as a spare
o Stainless steel ends allow for the assembly at CERN of a spare for ALICE, ATLAS or CMS central pipes- these additional pieces have not been made
o Status: Delivered to CERN, acceptance tests complete, in storage
LEMIC 29 IV 08 Beampipe Status - R.Veness
CMS: Cavern Activities
o Forward pipeo Installed Mar ‘08o Leak problems with TAS seal, eventually
resolved
o Central pipeo Installed Apr ’08o Leak tested OK
o HF/CT2- assemblyo Installed 25/4/08
o Gas injection systemo Installed in cavern, connections in
progresso Commissioning expected ~20th May
o Remaining taskso End cap pipe ‘-’ due for installation
tomorrowo 45 days of VAC activities before chamber
commissioned on 16th June - !o Installation and bakeout teams in parallel
o Pure gas filling, PIXEL installation, final closing and pumping come after this
Central Pipe installation
HF/CT2 chambers installed on ‘-’ side
LEMIC 29 IV 08 Beampipe Status - R.Veness
LHCb
o Recent activiteso Re-configuring beampipe protection for detector tests
o VELO testing
o VELO handover meetings – still some details to agree
o Reserve chamberso UX85/1 chamber:
o large leak discovered during final testing before sending for NEG coating
o CERN workshops will re-manufacture another spare for end May 08
o UX85/2 and /3 chambers mechanically complete and tested
o Remaining activitieso Final pure gas pump-out to be scheduled
o Dates need to be coordinated with other experiments
LEMIC 29 IV 08 Beampipe Status - R.Veness
Access to, or Removal of Beampipes
o Possible scenarios requiring access or removalo Re-activation of NEG following extended use [normal]
o Re-activation of NEG following accidental saturation [urgent]
o Leak in beampipe due to damage during intervention [critical]
o Current Situationo All experimental vacuum chambers are ‘single point failure’ items
for the LHC machine
o One spare exists (or will before first beam) for most chamberso Exceptions are: CMS endcap pipe, ALICE RB26 chambers
o Spares for beryllium chambers are in stainless steel for ATLAS, ALICE, CMS and aluminium for LHCb
o A 1m beryllium section with stainless steel ends exists at CERN as a common replacement for ATLAS, ALICE and CMS
o NEG activation equipmento ATLAS and ALICE-RB26 equipment is permanently installed
o ALICE-central pipe, CMS and LHCb equipment is (basically) removable
LEMIC 29 IV 08 Beampipe Status - R.Veness
Access to, or Removal of Beampipes (2)
o Proposed Actionso Produce a spare CMS endcap pipe [but not ALICE RB26 chambers?]
o Evaluate (VAC+Experiments) the time for these ‘long’ interventionso Inform and get approval from LHC managment
o Depending on results, either:o Look for ‘emergency’ methods of reducing these access times
o Consider additional procedures or access restrictions to minimise chance of access being required
Time to activate NEG
Time to remove chamber
ATLAS Short Long (VI)
ALICE CP Long Long
ALICE RB26 Short Long
CMS Short Short
LHCb Short ? (VELO)
LEMIC 29 IV 08 Beampipe Status - R.Veness
Currently Requested Consolidation Activities
o ATLASo Replace stainless steel VA chambers with aluminium (2 years)o Replacement VI beryllium chamber for PIXEL upgrade (5 years)
o ATLAS and CMS (inner triplet upgrade)o Replace TAS chambers with larger diameter (3 years)o Re-design and replace remote flanges with larger diameter versions
(3 years)o Re-design and replace 19m pumping stations with larger diameter
versions (2 years)
o LHCbo Replace defective UX85/3 beryllium chamber – approval in progress
(Target: 2009/10 shutdown)o Re-optimise UX85/2 and UX85/3 fixed supports for lower-Z versions
(Target: 2009/10 shutdown)o Replace stainless steel with aluminium bellows (2 years)o Replace VELO boxes (VAC support for NIKHEF) (TBD)
Dates are estimates for design and manufacture from time of project approval
LEMIC 29 IV 08 Beampipe Status - R.Veness
Experimental Vacuum: Re-structuring for Operation
o Completion of installationo The AT-VAC/EN section (R.Veness) remains the contact for
completing the installation of the experimental sectors
o Vacuum operationo The AT/VAC-LHC section (V.Baglin) will take over operation of the
experimental sectors from commissioning- operational questions should be addressed to him
o Interventions, consolidation and upgradeo R.Veness will be the contact for planning annual shutdown
activities
o AT/VAC-LHC will take over vacuum-related interventions
o AT/VAC-EN will undertake mechanical interventions
o AT/VAC-EN will be responsible for new beampipe and support design
LEMIC 29 IV 08 Beampipe Status - R.Veness
Summary
o Installation of experimentso ALICE and LHCb largely complete - the few remaining activities
must be carefully scheduled as resources are stretched
o ATLAS final closure started, but still 38 days work remain
o CMS going well – 3 chambers in last 2 weeks, still 4 more to install, 45 more days of activity
o Operation and consolidationo Access scenarios and times need to be clarified and agreed by
management
o Please make sure we are included early in planning the 2008/9 shutdown
o We will need to coordinate between all experiments and find extra resources if justified by volume of work
o Work is starting on consolidation tasks, we need to:o Verify the list of tasks
o Agree the scope, schedule and financing
LEMIC 29 IV 08 Beampipe Status - R.Veness
Additional Material
LEMIC 29 IV 08 Beampipe Status - R.Veness
Contract timescale for Phase 1 beryllium pipes
2001 2002 2003 2004 2005 2006 2007
Market survey placed
Finance committee approval for contract placement
Call for tenders
Contract placed
ATLAS chamber delivered to CERN
Chamber assembled ready for installation
Integration into PIXEL starts in SR1
Total contracting and manufacture: 4 years, 2 months
Installation in ATLAS starts
Total project duration: 6 years, 5 months
Engineering design agreed