[r. alemany] [cern ab/op] [engineer in charge of lhc ] lectures at nikhef (12.12.2008)
DESCRIPTION
[R. Alemany] [CERN AB/OP] [Engineer In Charge of LHC ] Lectures at NIKHEF (12.12.2008). The Large Hadron Collider Contents: 1. The machine II. The beam III. The interaction regions IV. First LHC beam. III. First LHC beam. Contents: Injection test 1 Injection test II Injection test III - PowerPoint PPT PresentationTRANSCRIPT
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The Large Hadron ColliderContents:
1. The machineII. The beam
III. The interaction regionsIV. First LHC beam
[R. Alemany][CERN AB/OP]
[Engineer In Charge of LHC]Lectures at NIKHEF (12.12.2008)
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III. First LHC beamContents:I. Injection test 1II. Injection test IIIII.Injection test IIIIV.10th September
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IV.1. Injection Test 1
8 to 10.08.2008
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IV.I. Injection Test 1 Achieved
Synchronization SPS – LHC Beam 1 injected IP2 Through to collimators in IP3 first shot Trajectory correction Kick-response measurements Off-energy measurements (dispersion) Explored the aperture First beam induced quench
Discovered Aperture restriction in the injection line
Traced to misaligned vacuum pump Optics problem IP3
Polarity convention QTL
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IV.II. Injection Test 2
22-24.08.2008
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IV.II. Injection Test 2 Achieved
Beam 2 injected IP8 Through to collimators in IP7 first shot Trajectory correction Kick-response measurements Off-energy measurements (dispersion) Explored the aperture Beam 1 injected IP2 Through to collimators in IP3 Aperture in injection region OK Polarity correction confirmed Interleaved injection
Discovered Optics problem at the end of the TI8 line
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I.I. Basic layout of the machine: quadrupole corrector magnets
LHC TDR
Fo
Do
MSCB
MCBM (dipole):Nominal main field strength = 2.93 TInominal = 55 A, 1.9 K, L=78.5 cm, ~143 kg
MSM (sextupole):Nominal main field strength = 4430 T/m2
Inominal = 550 A, 1.9 K, L=45.5 cm, ~83 kg
ChromaticityOrbit
Explore a range of particle angles (=kick strength) with one corrector dipole, then go to the next one
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IV.II. Injection Test 2Beam 1 injected IP2Through to collimators in IP3Aperture in injection region OKPolarity correction confirmedInterleaved injection
DiscoveredOptics problem at the end of the
TI8 line
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IV.III. Injection Test 3
5 – 7.09.2008
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IV.III. Injection Test 3 Achieved
Beam 2 injected IP8 Threaded to dump in IP6 Steered then inject and dump Beam 1 injected IP2 Threaded through to coll in IP5
Discovered Optics problem in IP7
Polarity convention on Q6 Optics problem in IP4
Polarity convention
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IV.IV. 10th of September
10.09.2008
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IV.IV. 10th of SeptemberAchieved
Beam 1 injected IP2Threaded around the machine in 1hTrajectory steering gave 2 or 3 turns
Beam 2 injected IP8Threaded around the machine in 1h30Trajectory steering gave 2 or 3 turnsQ and Q’ trims gave a few hundred turns
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IV.IV. 10th of SeptemberBeam 1 – First turn
trajectory
Each point is a BPM (Beam Position Measurement)
49 mm apertureARC BPMs
Betatron oscillation
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IV.IV. 10th of September Beam 1 on TDI screen – 1st and 2nd
turns
ALIC
E
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IV.IV. 10th of September Beam 2 – First turn
trajectory
Horizontal position (mm)
Vertical position (mm)
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IV.IV. 10th of September Beam 2 – first turn dispersion
measurement
ppsDx x
)(
RF
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IV.IV. 10th of September Beam 2: Longitudinal Bunch Profile
~ 200 turns
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IV.IV. 10th of September Beam 2 closed orbit
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IV.IV. 10th of September Beam 2 beta measurement
QF
QD
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IV.IV. 10th of September Beam 2 beta measurement
Reminder from BH lectures
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IV.IV. 10th of September Beam 2 integer tunes
Qx = 64
Qy = 59
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IV.IV. 10th of September Beam 2 tunes
Qx = .279Qy = .310
BPM pos FFT tune
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IV.IV. 10th of September Beam 2 fast BCT (Beam Current Transformer)
FBCT
Inte
nsity
~ 3 109
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IV.IV. 10th of September Beam dilution on dump block
~ 8 m
concrete shielding
Beam Dump Block (graphite)
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IV.IV. 10th of September Beam 2 captured – mountain range
display
Now RF ON
Bunch length
Turn
num
ber
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IV.IV. 10th of September Fast start 10, 11 and 12
All done in 3 days Made possible by
Meticulous preparation Magnetic model data Sophisticated settings generation Dry runs Injection tests
Powerful control system (LSA) Powerful instrumentation working very quickly Logging a multitude of parameters
Allowed early look at several machine parameters systematic check of orbit system
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IV.IV. 10th of September