MEMS multi-pole electromagnets:

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" MEMS multi-pole electromagnets: "
Harrison, Jere Charles Candler, Rob NJudy, Jack W

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	898219
Doc. No	:	TL8dj562hs
Main Entry	:	Zhang, Xi
Title & Author	:	MEMS multi-pole electromagnets:\ Harrison, Jere CharlesCandler, Rob NJudy, Jack W
Date	:	2014
student score	:	2014
Abstract	:	MEMS electromagnets occupy a unique niche in the design space of magnetic devices: they are small enough that length-scaling enables Tesla-scale field intensity and kTesla-scale field gradient, but large enough that power dissipation does not exceed practical power density limits for conductive cooling. This work demonstrates the first application of MEMS electromagnets to charged particle beam optics. Particle beam optics are an important component in beam transport systems for medical and scientific instruments such as Hadron therapy for cancer treatment and free electron lasers for high energy coherent light production. These MEMS devices promise smaller and higher performance instruments using the performance scaling that results from reducing the electromagnet gap. This work demonstrated a MEMS multi-pole Ni 80 Fe 20 -yoke electromagnet with a 600 &mum pole-pole gap producing a 24-mT dipole field at 3 A, steering a 34-keV electron beam in two dimensions without measurable hysteresis. The same multi-pole electromagnet producing a 220-T/m quadrupole field gradient at 4.7 A was used to focus a 34-keV electron beam. The spatial distribution of the quadrupole field was characterized using a novel electron beam-probe method. Simulations project that 4-pole electromagnets with 100 &mum pole-pole gap electromagnets and a 200 &mum thick Co 57 Ni
Added Entry	:	Harrison, Jere Charles
Added Entry	:	UCLA