Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
DOI: 10.1109/pac.1999.795347
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Optimisation of the current ramp for the LHC

Abstract: The field quality of the main magnets in the LHC will be, in part, dependent upon the shape of the magnetic field as a function of time. A theoretical optimisation of this function has been carried-out with the aim of minimising the dynamic errors [3]. This work resulted in the definition of a current ramp function composed of mathematically defined, smoothly joining segments. A prototype digital controller based on a DSP has been developed and built [4]. In this equipment the current ramp is computed from the… Show more

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Cited by 5 publications
(4 citation statements)
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“…II. Current ramp-rate acceleration and deceleration phases, implemented by parabolic functions, are identified by imposing the continuity of the derivative at the transition to a linear ramp 32 .…”
Section: Controller Performance Assessmentmentioning
confidence: 99%
“…II. Current ramp-rate acceleration and deceleration phases, implemented by parabolic functions, are identified by imposing the continuity of the derivative at the transition to a linear ramp 32 .…”
Section: Controller Performance Assessmentmentioning
confidence: 99%
“…The ramp to nominal current of 11 850 A for the dipole circuit [12] starts slowly and continues with a maximum ramp rate of 10 A/s after several minutes. At the first attempt, the second dipole magnet quenched 230 A below nominal current.…”
Section: First Poweringmentioning
confidence: 99%
“…The preferred form for the main magnetic elements is explained in another contribution to this conference [2]. The control algorithm requires the precise value of this waveform to be evaluated every loop iteration (1ms).…”
Section: Reference Generationmentioning
confidence: 99%