LS1 activities J.M. Jimenez 4 th December’ 13
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Transcript of LS1 activities J.M. Jimenez 4 th December’ 13
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LS1 activities
J.M. Jimenez 4th December’13
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2Introduction to LS1J.M. Jimenez 4th December 2013
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3Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of TechnologyThe LHC tunnel with dipole magnets
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4Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of TechnologyDipole Magnets: 1232 of them operating at 1.9K
7 TeV8.33 T11850 A7MJContracts by 4.7cm during
cool-down
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5Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of TechnologyThe LHC long straight sections
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6Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of Technology Challenges for 2012: increasing luminosity…
Objectives being achieved…!
Even if running at 50 ns butwith an optimised crossing angle
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7Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of TechnologySome technological challenges for next years…
Circumference (km) 26.7 100-150m underground
Number of Dipoles 1232 Cable Nb-Ti, cold mass 37million kg
Length of Dipole (m) 14.3
Dipole Field Strength (Tesla) 8.4 Results from the high beam energy needed
Operating Temperature (K) 1.9 Superconducting magnets needed for the high magnetic fieldSuper-fluid helium
Current in dipole sc coils (A) 13000 Results from the high magnetic field1ppm resolution
Beam Intensity (A) 0.5 2.2.10-6 loss causes quench
Beam Stored Energy (MJoules) 362 Results from high beam energy and high beam current1MJ melts 2kg Cu
Magnet Stored Energy (MJoules)/octant
1100 Results from the high magnetic field
Sector Powering Circuit 8 1612 different electrical circuits
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8Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of TechnologyLHC beam stored energy
Momentum at collision 7 TeV (1 eV = 1,6 × 10-19 Joule)
Number of bunches 2808Protons per bunch 1.15 1011
Total number of protons 6.5 x1014 (1 ng of H+) (for 2 beams)
700 MJ melt one ton of copper
Energy stored in the two beams: 724 MJouleEnergy to heat and melt one ton of copper: 700 MJoule
700 MJoule dissipated in 88 s
700.106 / 88.106 8 TW
World Electrical Installed Capacity 3.8 TW
90 kg of TNTper beam
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9Introduction to LS1J.M. Jimenez 4th December 2013
LHC: A Marvel of TechnologyLHC cryomagnets stored energy
10 GJoule flying 700 km/h
The energy stored in the LHC magnets corresponds
approximately to 8 such trains running at 300 km/h
1232 * 108 mH = 133 H ; ½ L . I2 ~ 10 GJ
• Energy stored in the magnet system: 10 GJoule• Energy stored in one (of 8) dipole circuit: 1.3 GJoule
Magnetic energy must be
discharged in around 40 seconds!
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10Introduction to LS1J.M. Jimenez 4th December 2013
301 ± 85pΩ
Rmax = 2.7nΩ
Rmax = 3.3nΩ
306** ± 313pΩ
(**) number of splices in the quads segments corrected, 1.3 added
Dipole Buses Quad Buses
12 23 34 45 56 67 78 81
Main Dipoles&Quads Bus, sorted by position, 2048 segmentsAll HWC pyramids and plus ~150 ramps to 3.5TeV analyzed
Top 10 Splice Resistances
2nΩ
LS1 activitiesLHC Main Splices: Busbars SC
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11Introduction to LS1J.M. Jimenez 4th December 2013
LS1 – magnet replacement
Finished SSS 233, with vacuum barrier: a long story of leaks and repairs (bulk material leak). Successful final pressure test !All dipoles ready, awaiting
diode installation
Cryo-BLM mounted on Q7R3
Only 1 more magnet to test (Q7R3) before the 2012 year end and cryo-shutdown in SM-18
Preparing for higher intensities
Q5 and Q7, built for the first time
at CERN
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12Introduction to LS1J.M. Jimenez 4th December 2013
LS1 activities Splices & Copper stabilizers
Splices
Splice join
Copper stabiliser joins
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13Introduction to LS1J.M. Jimenez 4th December 2013
LS1 activities Splices & Copper stabilizers
• Despite correct splice resistance between SC cables, a 13 kA joint can burn-out in case of a quench, if there would be a bad bonding between the SC cable and the copper bus, coinciding with a discontinuity in the copper stabilizer
• Resistance measurements and g-ray pictures have shown the presence of many of such defective joints in the machine, limiting the safe operating current
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14Introduction to LS1J.M. Jimenez 4th December 2013
LS1 activities 13kA splices consolidation
Welds cutting with orbital cutting machine in placeSleeve slidingBus bars machiningShunts positioning and solderingKapton foil insulation along 250mmInjection envelopes in placeLower insulation cover insertionUpper insulation cover insertionInsulation covers FixationResin injection into the envelopesSpider insulation in place
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15Introduction to LS1J.M. Jimenez 4th December 2013
LS1 activities Cryo-feedbox consolidation
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16Introduction to LS1J.M. Jimenez 4th December 2013
TE-VSC
LS1 activities Radiation to Electronic in LHC tunnel: a concern…
UJ76
UJ14/16RR13/17
UJ56RR53/57
US85
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17Introduction to LS1J.M. Jimenez 4th December 2013
Overall additional number of persons at CERN during LS1 per status
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18Introduction to LS1J.M. Jimenez 4th December 2013
LS1 activities Dashboard…
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19Introduction to LS1J.M. Jimenez 4th December 2013
Resuming Operation
from mid February 2013 to end December 2014
F M A M J J A S O N D J F J FM A M J J A S O N D
2013 2014 2015
M A
LHC
SPS
PS
PS Booster
beam to beam
PhysicsBeam commissioningShutdownTests
Courtesy Katy Foraz
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20Introduction to LS1J.M. Jimenez 4th December 2013
December 4, 2012 Roberto Saban 20
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Long Shutdown 1(13th Feb. 2013 to Dec. 2014) – Beam Commissioning Jan.-Apr. 2015)
A very busy period – Safety, Quality, Schedule
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