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THE PS BOOSTER AS PRE-INJECTOR FOR LHC

K. Schindl

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Abstract

The LHC will be supplied with protons from the injector chain Linac2-PS Booster-PS-SPS. The beam must have small transverse emittances to fit into the LHC dynamic aperture, but sufficient intensity to assure high luminosity operation. Such a beam with a brightness twice the one of present beams is feasible with a scheme involving acceleration of one bunch (instead of five) in each of the four PSB rings to a kinetic energy raised from 1 to 1.4 GeV, and two-batch filling of the PS. Beam dynamics aspects such as how to tackle small emittances under high space charge, optimizing the (time-varying) working point and dealing with stop-bands, the advent of new RF harmonics 1 and 2, how to shape the magnet cycle, are discussed, and results of machine experiments reported. Finally some open issues as well as ideas for future improvements are discussed.

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What this paper is about

The LHC will be supplied with protons from the injector chain Linac2-PS Booster-PS-SPS. The beam must have small transverse emittances to fit into the LHC dynamic aperture, but sufficient intensity to assure high luminosity operation. Such a beam with a brightness twice the one of present beams is feasible with a scheme involving acceleration of one bunch (instead of five) in each of the four PSB rings to a kinetic energy raised from 1 to 1.4 GeV, and two-batch filling of the PS. Beam dynamics aspects such as how to tackle small emittances under high space charge, optimizing the (time-varying) working point and dealing with stop-bands, the advent of new RF harmonics 1 and 2, how to shape the magnet cycle, are discussed, and results of machine experiments reported. Finally some open issues as well as ideas for future improvements are discussed.

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Available abstract

The LHC will be supplied with protons from the injector chain Linac2-PS Booster-PS-SPS. The beam must have small transverse emittances to fit into the LHC dynamic aperture, but sufficient intensity to assure high luminosity operation. Such a beam with a brightness twice the one of present beams is feasible with a scheme involving acceleration of one bunch (instead of five) in each of the four PSB rings to a kinetic energy raised from 1 to 1.4 GeV, and two-batch filling of the PS. Beam dynamics aspects such as how to tackle small emittances under high space charge, optimizing the (time-varying) working point and dealing with stop-bands, the advent of new RF harmonics 1 and 2, how to shape the magnet cycle, are discussed, and results of machine experiments reported. Finally some open issues as well as ideas for future improvements are discussed.

Key concepts: Booster (rocketry), Injector, Dynamic aperture, Large Hadron Collider, Physics, Beam (structure), Harmonics, Magnet

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