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LHCC , CERN 24th September 2008 PowerPoint PPT Presentation


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LHC Status. Lyn Evans. LHCC , CERN 24th September 2008. Kick response compared with theoretical optics. Dispersion 2-3. Beam on turns 1 and 2. Courtesy R. Bailey. Few 100 turns. Courtesy R. Bailey. Integer tunes. Courtesy R. Bailey. Tune measurements. Courtesy R. Bailey. Fast BCT.

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LHCC , CERN 24th September 2008

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Lhcc cern 24th september 2008

LHC Status

Lyn Evans

LHCC, CERN 24th September 2008


Kick response compared with theoretical optics

Kick response compared with theoretical optics


Dispersion 2 3

Dispersion 2-3


Beam on turns 1 and 2

Beam on turns 1 and 2

Courtesy R. Bailey


Few 100 turns

Few 100 turns

Courtesy R. Bailey


Integer tunes

Integer tunes

Courtesy R. Bailey


Tune measurements

Tune measurements

Courtesy R. Bailey


Fast bct

Fast BCT


Dump dilution sweep

Dump dilution sweep


H wire scan

H wire scan


No rf debunching in 25 10 turns i e roughly 25 ms

No RF, debunching in ~ 25*10 turns, i.e. roughly 25 mS

Courtesy E. Ciapala


First attempt at capture at exactly the wrong injection phase

First attempt at capture, at exactly the wrong injection phase…

Courtesy E. Ciapala


Capture with corrected injection phasing

Capture with corrected injection phasing

Courtesy E. Ciapala


Capture with optimum injection phasing correct reference

Capture with optimum injection phasing, correct reference

Courtesy E. Ciapala


Lhc longitudinal bunch profile beam 2

LHC longitudinal bunch profile Beam 2


Transformer failure

Transformer failure

  • At 23:30 on Friday a 12 MVA transformer at Point 8 failed

  • There is no spare unit but CMS has 2 similar transformers and a lot of over-capacity

  • The cryogenics at point 8 (7-8 and 8-1) was lost

  • The CMS transformer was installed on Saturday and Sunday


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