Beams Document 2819-v1

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A phase-one LHC luminosity upgrade based on Nb-Ti

Document #:
Beams-doc-2819-v1
Document type:
Talk
Submitted by:
Camille M. Ginsburg
Updated by:
Camille M. Ginsburg
Document Created:
20 Jun 2007, 13:37
Contents Revised:
20 Jun 2007, 13:37
Metadata Revised:
20 Jun 2007, 13:37
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Abstract:
Several options for a luminosity upgrade based on Nb-Ti "long" quadrupoles have been studied in the past years. In this seminar we present a parametric study aiming at finding the relations between the triplet length, its aperture, and the minimum beta functions that can be achieved in the IP using quadrupoles built with the LHC main dipole cable. We carry out the electromagnetic design for apertures ranging from 100 to 140 mm, extending the results of previous work, and using the critical currents as measured in the LHC cable production. Issues related to forces and protection in these large aperture magnets are presented.

We then consider the hypothesis of a phase-one upgrade, where the detectors are not modified, and therefore the maximal goal is to double the luminosity or to allow a recovery from non-nominal parameters using stronger focusing. We show that a solution with 130 mm aperture and 34 m long triplet (i.e., 10 m longer than nominal) would allow reaching a beta function in the IP of 25 cm. This would also leave some clearance for removing the limitations in beam intensity due to the impedance of collimators. Finally, we show that this additional clearance also allows improvement of the field quality, thus reducing the nonlinearities arising from the large beta functions.

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