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CONTROLLED LONGITUDINAL EMITTANCE BLOW-UP IN A DOUBLE HARMONIC RF SYSTEM AT CERN SPS

Theodoros Argyropoulos, Thomas Bohl, T. Linnecar, E. Shaposhnikova

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Abstract

Controlled longitudinal emittance blow-up together with a fourth harmonic RF system are two techniques that are being used in the SPS in order to stabilize the beam before injecting into the LHC. The emittance blow-up has been achieved by introducing a band-limited phase noise during acceleration. Measured variations of the final emittance along the batch can be explained by the modification of the synchrotron frequency distribution due to the effect of beam loading in a double harmonic RF system.

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What this paper is about

Controlled longitudinal emittance blow-up together with a fourth harmonic RF system are two techniques that are being used in the SPS in order to stabilize the beam before injecting into the LHC. The emittance blow-up has been achieved by introducing a band-limited phase noise during acceleration. Measured variations of the final emittance along the batch can be explained by the modification of the synchrotron frequency distribution due to the effect of beam loading in a double harmonic RF system.

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Available abstract

Controlled longitudinal emittance blow-up together with a fourth harmonic RF system are two techniques that are being used in the SPS in order to stabilize the beam before injecting into the LHC. The emittance blow-up has been achieved by introducing a band-limited phase noise during acceleration. Measured variations of the final emittance along the batch can be explained by the modification of the synchrotron frequency distribution due to the effect of beam loading in a double harmonic RF system.

Key concepts: Thermal emittance, Synchrotron, Large Hadron Collider, Harmonic, Physics, Beam (structure), Acceleration, Beam emittance

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