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The TAC H- Ion Source and Low Energy Beam Transport

出版	Texas A & M University, 1990
URL	http://books.google.com.hk/books?id=3967twAACAAJ&hl=&source=gbs_api

註釋Availability and usefulness of accelerators is greatly dependent on machine reliability, brightness and size. Research must focus on less expensive, more compact accelerators with brighter beams. This thesis experiment has incorporated an optimized version of the present Brookhaven H- ion source[1] with a helical electrostatic quadrupole(HESQ), low energy beam transport(LEBT). The ion source incorporates a computer optimized circular extraction system which provides an azimuthally symmetric beam. The source design has been simplified including removal of the gradient bending magnet found in conventional systems of this type. Immediately following the extraction cone of the ion source, is a set of beam optics(LEBT) designed after the theory developed by Raparia [2]. This unique transport system incorporates strong electrostatic focusing yet requires voltages which are a fraction of the beam voltage. The HESQ LEBT allows the beam to experience focusing as soon as possible. This immediacy greatly impedes degradation of the beam quality due to self repulsion of the charged particles. Combining the cylindrically symmetric source with an electrostatic LEBT is a useful step in the development of the magnetron H- ion source. This has created a simpler and more compact H- ion source and beam transport system than any presently available. The ion source portion of the TAC H- Ion Source/LEBT or THISL experiment has been chosen to be the initial ion source for the Superconducting Supercollider(SSC) project. However, the LEBT portion of the THISL experiment still needs a great deal of research and development in order for it to be completely ready for use in a production linear accelerator(linac.).