Transcript LMCinfo1 - Indico

LMC 1 (Pre Chamonix)
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DN200 relief valve position
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Sector 12 magnet with 100nΩ resistance - opened
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No or very little solder on one half-moon splice
Sector 67 magnet with 50nΩ resistance
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On top wherever possible. Open W bellows for MLI protection.
Elsewhere (few special cases) install at -55 degrees
Later changed to installation at 50 degrees (February 18)
Decided to remove (January 28) – will be cycled in SM18
Reminder of sector warm up or otherwise
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34
12 warm for dipoles exchange
67 warm for dipole exchange
56 warm for connecting cryostat repair
23 and 45 empty of helium for transport, held at < 100K
78 and 81 remain full of helium
Chamonix 2009
Monday 02 to Friday 06 February 2009 Chamonix Majestic
Session 01 - What did we learn without beam in 2008
Session 02 - Safety
Session 03 - Repair of 34
Session 04 - Strategy for consolidation to avoid incident and limit collateral damage
Session 05 - Shutdown Modifications 2008/9 and Future shutdowns
Session 06 - What else can go wrong
Session 07 - What did we learn with beam in 2008?
Session 08 - What we will do for beam preparation in 2009
Session 09 - What will we do with beam in 2009/10
Session 10 - Summary session
Tuesday 18 February 2009 CERN main auditorium
Session summaries
Magnet cold testing and measurements
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Magnet cold testing going well, about on schedule (OP in SM18)
Last magnet to go down mid-April
No dedicated resistance measurements during the series tests
Measurement methods investigated end of 2008
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Data taken during series tests identified
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Resistance can be derived from this but only with 15nΩ resolution
Thorough analysis of SM18 data will be done (PH will help)
New setup defined to meet requirements of 1nΩ
6 magnets had been blocked during the recent SM18 tests
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4 had been approved after measurements/re-analysis
MB2420 not accepted, rather opened
MB 3383 not accepted, rather retested
Sector 34 repair
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Surface
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Cold testing going OK
Beam screen installation the present focus
Underground
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D area
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Outside D area
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18 of 53 magnets underground
Alignment (with smoothing) required contiguous magnets
So little done
Interconnection work running late
New planning will be needed
Welding not started (should have happened in January)
Will be knock-on effects
Vacuum cleaning ongoing
Water cooled cables
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Chlorine in the reinforcement layer (affects 66% of all)
Cracks (affects 22% of all, some overlap with above)
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Result is that only about 25% are OK (no chlorine, no cracks)
All need changing (3 to 4 year campaign)
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3 new cable types tested, best chosen, cables arriving
Start with worst cables (around points 6 and 4)
Exchange not easy and could impact on overall planning
Start at point 4
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Change 22 cables
Intervene also at point 6
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During transport at point 4
Change 3 cables
QPS upgrade
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Large scope
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Splice detection AND symmetric quench detection
5500 new printer circuit boards
230km of cable
Project
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Detailed planning in place
Several work packages outsourced (BE-OP, TE-EPC)
Deadline for completion end of August
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External review recommendations
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UPS upgrade needed to provide redundancy
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Cabling the main issue
Optimisation of use of radiation-hard cable
Interference with magnet transport
Planning foresees done by end June
Undulator L4
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Employs 8 coils in series
Each has an energy extraction resistor in parallel
One of them is broken/disconnected on device L4
3 options
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Use undulator as it is
Add an external resistor to change the response in case of quench
Replace the magnet with the spare
Since in any case the undulators will eventually need a
modification to circumvent an issue with ramping times, for
now solution 2
Stand alone magnets and inner triplets
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Relief valves will be fitted according to needs
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So over 100 relief valves on these elements
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24 or maybe 48 if MLI ‘plugging’ serious enough
24
21
23
4
to be finalised
IT
SAM
Semi SAM
DFBM
DFBL
DFBA
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PiMs
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No failures in LSS seen so far
The non-conformity at the root of general problem not (as) relevant
Will not be systematically changed
Inspect whenever possible
Running in winter
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Cryogenic plants
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Start beam operation with single cryoplants at 6 and 8
Check the situation under these conditions
At points 2 and 4 the margins are less, so keep double
Keep all active for Hardware Commissioning
Electrical costs
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Increased compared to LPT due to three factors
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Total increase is around 13MEuros
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Change in LTP itself
8% increase in energy prices
Winter rates
Winter running contributes about 8MEuros to this (with reduced cryo)
Other aspects to be looked at
Planning as of February 25
Commissioning schedule (as of March 03)