LHC Commissioning Working Group 2006

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LHC Commissioning Working Group 2006

• Presented to LTC in November and MAC in December

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20th meeting of the LHC MAC (7-9 December 2006)
Executive summary Beam Commissioning
Plans We are pleased to see the thoroughness of
the work of the LHC Commissioning Working Group,
LHCCWG, in laying plans for commissioning of the
LHC. The general strategy for the initial 2007
run at 450 GeV is sound. The expressed goals are
appropriate. The MAC urges the leadership of the
laboratory to give high priority to completion of
the thorough and systematic investigation of beam
and system behavior before beginning the shutdown
for hardware commissioning to high energy
operation. This may well mean extending the run
into 2008. We urge particularly that careful
study of beam capture and stabilization during
ramping to some modest energy above 450 GeV be
carried out before the shutdown to investigate
snapback effects. Initial experience with the
collimator system adjustment will also be
valuable. Wide experience shows that from such
systematic studies many things will be learned
about controlling the machine properly. Further,
inadequacies and important but unanticipated
malfunctions will be revealed so that they may be
rectified during the shutdown.
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2007 - Triplets

• During the pressure test of Sector 8-1 (25th
  November) the heat exchanger tube in the inner
  triplet failed at 9 bar differential pressure
• A repair procedure is being validated and will
  have to be implemented on all 24 quadrupoles (18
  are already installed)
• Baseline Replacement and installation of new HX
  tubes
• Plan B Repair of existing tubes by inserting an
  HDPE/inox reinforcement in tube extremities
  followed by a pressure test.
• Repair performed in the tunnel without
  displacement of any of the installed magnets or
  DFBX. HX removal/insertion from open
  interconnects
• Restart interconnection and installation
  activities this week
• Completion of repair of triplet 5L in time for
  pressure test and cooldown of Sector 4-5.
• Consequence
• Sector 8-1 will be cooled down and commissioned
  after 4-5
• Sector 8-1 will be commissioned only to 450GeV in
  2007
• Planning will have to change

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2007 - QD circuit

• RAT (Réunion Avancement Travaux) point 8, January
  26th
• There is a short to ground localized on the
  quadrupole circuit Q21L8 that is going to be
  detected. D.Bozzini will continue the
  investigation this morning. The cooldown is on
  standby waiting until new situation.
• RAT (Réunion Avancement Travaux) point 8, January
  29th
• The short to ground found last week disappeared
  on Saturday 27th at 350am. Nonetheless, it was
  already localized on Friday 26th to be in the
  interconnection between C21L8 and C22L8 the
  resolution of such localization is not yet
  sufficient to tell if it is in the interconnect
  or in the lyra.

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2007 - Committees

• ICC
• Starts Feb 2nd
• Every 2 weeks
• Lyn as Chair
• Roberto (DC)
• Roger (SS)
• LTC
• Steve plans to focus LTC on LHC beam
  commissioning
• Role of LHCCWG may need modification

"The LHC Installation and Commissioning Committee
will closely monitor, at the project management
level,  the final stages of installation and the
intimately linked hardware and beam commissioning
phases of the LHC machine. Aiming at
commissioning the LHC as a team, it will
co-ordinate across all departments and will have
members directly involved in these activities. It
will meet every fortnight on Friday mornings and,
as an evolution of the TCC, will also deal with
the remaining issues of planning and Engineering
Change Control."
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So what should we do in 2007?
Two major axes
- A - Continue elaboration of commissioning plan in LHCCWG - A - Continue elaboration of commissioning plan in LHCCWG
Finish run through of commissioning phases Finish run through of commissioning phases
Two beam operation
Details of the ramp
Measurements needed at top energy
Collisions at top energy
Documentation and procedures Documentation and procedures
Based on what we heard in 2006
Verena and EICs doing this
Discussion and follow up needed
Other follow up Other follow up
Prioritise open action list
Treat high priority actions
- B - Get more involved in the Accelerator Systems side - B - Get more involved in the Accelerator Systems side
Hardware commissioning Hardware commissioning
Power tests of main circuits (with HCC)
Individual system tests (with HCC)
Things not covered by HCC
Integration into operation Integration into operation
From IST to operation
Control from the CCC
Operation with beam
Elaborate details of Q4 2007 Elaborate details of Q4 2007
Hardware commissioning
Machine checkout
Beam
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Accelerator systems Responsible LHCCWG
Technical Services TI operations P.Sollander Not needed
Technical Services Controls H.Schmickler Not needed
Technical Services Electrical supply F.Rod Mateos Not needed
Technical Services Cooling and ventilation J.Inigo-Golfin Not needed
Technical Services Access safety systems T.Pettersson PC
Hardware Commissioning Cryogenics L.Serio GA, SR, WV
Hardware Commissioning Main Ring Magnets Performance A.Siemko WV, MG
Hardware Commissioning Insertion Magnets Performance R.Ostojic WV, MG
Hardware Commissioning PIC B.Puccio WV, JU
Hardware Commissioning QPS K.H.Mess WV, JU
Hardware Commissioning Power converters F.Bordry WV, JU
Beam Commissioning Vacuum N.Hilleret RA, FZ, GA
Beam Commissioning Magnetic Model J.P.Koutchouk WV, MG, SF
Beam Commissioning Machine Protection Systems R.Schmidt JU, JW
Beam Commissioning Radiation Protection D.ForkelWirth RA, PC
Beam Commissioning Radiation monitoring T.Wijnands RA, PC
Beam Commissioning Beam Transfer V.Mertens See details
Beam Commissioning RF T.Linnecar See details
Beam Commissioning Beam Instrumentation R.Jones See details
Beam Commissioning Collimation R.Assmann RA, SR
Beam Commissioning High level controls M.Lamont See details
Beam Commissioning Operations R.Bailey See details
Beam Commissioning Accelerator physics O.Bruning See details
Beam Commissioning Experimental Conditions H.Burkhardt H.Burkhardt
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Meetings Q1

• Aim for meetings every 2 weeks as before
• Interleaved with LTC (proposed dates may have to
  change slightly)

Date Topics
1 January 31 Summary of 2006 work and outline for 2007 (Roger) Beam measurements at 450GeV Summary of parameter tolerances (Frank) Proposed beam measurement program in 2007 (Frank) What to do if we cannot get in tolerance (All)
2 February 14 Alternative filling schemes (Werner) Implications for the injectors (Elias) Documentation and procedures injection and first turn
3 February 28 Magnetic model meeting FiDeL (Luca) WISE (Ezio) LSA (Marek) Behaviour of the magnets through the squeeze (Walter) Documentation and procedures
March 14 OP visit to LNGS
4 March 28 Optics measurements needed at top energy (Frank) Collisions at top energy, luminosity determination and optimisation (Helmut) Commissioning of accelerator system - BLM (Laurette) Documentation and procedures
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Meetings Q2
Date Topics
5 April 11 Beam excitation meeting Controlled transverse blow up with pink noise (WH/MM) Using the damper (Wolfgang) Status of the AC dipole (Javier) Using the AC dipole (Stephane) Using the Aperture kickers (Frank S) Commissioning of accelerator system - Vacuum (Frank) Documentation and procedures
6 April 25 Details of the ramp (Mike, whats needed here?) Commissioning of accelerator system - RF (Magali) Documentation and procedures
7 May 9 MAD-X online model (Frank Schmidt) Commissioning of accelerator system - Magnets (Walter) Documentation and procedures
8 May 23 Report from MPSC subgroup (Jan)
9 June 6
10 June 20

• To be scheduled sometime
• 2 beam operation (Jan, Ralph)
• Beam losses and radiation monitoring for steering
  the beams in collision during the engineering run
  at 450GeV (and at high energy?) (Thijs)
• Beam commissioning experience (CNGS, LSS6, LSS4/6
  extraction) (Brennan)