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BE: Beschleunigerphysik

BE 4: Diagnostics and Instrumentation II

BE 4.7: Vortrag

Dienstag, 1. April 2014, 11:30–11:45, ZEU 255

Closed Orbit Control for Acceleration of Polarized Electrons in a Fast Ramping Accelerator — •Jens-Peter Thiry, Frank Frommberger, Andreas Dieckmann, and Wolfgang Hillert — Elektronen-Stretcher-Accelerator ELSA, Physics Institute, University Bonn

ELSA is a fast ramping stretcher ring supplying polarized electrons with energies up to 3.2 GeV. The acceleration is performed within 300 ms, with a fast energy ramp of 6 GeV/s. In order to preserve the initial degree of polarization during the ramping phase, various procedures are applied. These call for a high bandwidth of the orbit corrector system.

A fast energy ramp and a precise and stable control of the vertical orbit are crucial for polarization conservation. Additional harmonic field distributions have to be applied at certain energies, leading to extra requirements of the system.

Recently the vertical corrector system was upgraded to fulfill the required maximum field strength and high bandwidth. In this talk an overview of the performance of our closed orbit control system and an outlook of possible future plans will be given.