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The 600A corrector can be split into 3 categories with different functionalities.

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The 600A corrector can be split into 3 categories with different functionalities. - PowerPoint PPT Presentation


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The 600A corrector can be split into 3 categories with different functionalities. Each 600 A LHC corrector circuit fall into one, two or the three categories. Squeeze for the mains in IR1 & IR5. Quadrupole gradient [T/m] from Q1 to Q6 as a function of b * :

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slide1

The 600A corrector can be split into 3 categories with different functionalities.

Each 600 A LHC corrector circuit fall into one, two or the three categories

squeeze for the mains in ir1 ir5
Squeeze for the mains in IR1 & IR5

Quadrupole gradient [T/m] from Q1 to Q6 as a function of b*:

beam1 (left) and beam2 (right)

 Rather smooth and/or monotonous (note Q6 going to very low gradient

which will be the limiting circuits below b* ~2m ).

slide3

Squeeze for the trims QTL11, QT12 and QT13

Quadrupole gradient [T/m] in the trim quadrupoles (QTL11,-QT12,QT13)

as a function of b*: beam1 (left) beam2 (right)

  • More “erratic’’ with big jump at b* ~2m and 5 m, with unavoidable zero-crossing for both beams
target obtained on di dt and d 2 i dt 2 guess estimate in some cases
Target obtained on dI/dt and d2I/dt2 (guess-estimate in some cases)
  • 0) : The acceleration means what it means!.. i.e. I(t)=I(0)+(dI/dt) × t + 1/2 × (d2I/dt2 )× t2
  • 1) : d2I/dt2 further pushed by a factor of 3 for MO’s (starting of the ramp above 2 TeV not yet defined) and for MQSX,MCBX2 & 3 (requirement during squeeze not yet known if large dynamic b-beating).
  • 2) : d2I/dt2 could be compromised (reduced) for MCBX1 … but the parallel separation has to be switched off as quickly as possible to bring the beams into collision (to avoid parasitic collision at very small separations during a too long period).

Is dI/dt sufficient to warrant a degaussing cycle of the corrector after each fill??

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