An Adjustable Permanent Magnet Quadrupole (pmq) Final Focus System for Low Energy Experiments
نویسندگان
چکیده
The final focus system for the Thomson X-ray scattering experiment termed PLEIADES (Picosecond Laser-Electron InterAction for Dynamic Evaluation of Structures) at LLNL demands ultra-high field gradient quadrupoles in order to focus initially small beams to 1020μm spot sizes. The scheme present here circumvents limitations due to chromatic aberrations and space-charge effects in this relatively low energy (<100MeV) system. The final focus scheme is based on an ultra-high gradient (≥300T/m) quadrupole which employs the Halbach 16piece, permanent magnet design. Use of this optimized geometry, NdFeB material, and a small (5mm) bore allows the desired field gradient, and a few cm focal length, to be achieved. The adjustability of the focusing system is obtained by changing the relative longitudinal positions of sub-component focusing and defocusing magnets on precision movers. We present the results of RADIA 3D design simulations, and also discuss the results of beam dynamics simulations of the PLEIADES system using the tracking code.
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