Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 119: Beschleunigerphysik VI (Resonatoren, HF)
T 119.9: Vortrag
Montag, 4. März 2013, 18:45–19:00, WIL-C207
Design of permanent magnetic solenoids for REGAE — •Tim Gehrke1, Klaus Flöttmann2, Benno Zeitler1, Stephanie Manz3, and Florian Grüner1 — 1University of Hamburg and Center for Free-Electron Laser Science, Hamburg, Germany — 2DESY, Hamburg, Germany — 3MPSD, University of Hamburg, Hamburg, Germany
The Relativistic Electron Gun for Atomic Exploration REGAE is a small linear accelerator at DESY in Hamburg, which produces short, low emittance electron bunches. Two future experiments at REGAE, an external injection experiment for Laser Wakefield Acceleration (LWA) and a time resolving Transmission Electron Microscopy (TEM) setup, require strong focusing magnets inside the target chamber. Permanent magnetic solenoids can provide the needed focusing strength due to their enormous surface current density, while having compact dimensions at the same time. Solenoids are fundamentally non-linear focusing elements whose non-linearity is worst for short, strong magnets as required for REGAE. The induced emittance growth is investigated and minimized for different setups with axially and radially magnetized annular magnets. Since permanent magnetic solenoids cannot be switched off but are not needed in every experiment at REGAE, a mechanical lifting-system and a magnetic shielding has to ensure, that the different experiments do not disturb each other.