𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The Columbia University sub-micron charged particle beam

✍ Scribed by Gerhard Randers-Pehrson; Gary W. Johnson; Stephen A. Marino; Yanping Xu; Alexander D. Dymnikov; David J. Brenner

Book ID
103858006
Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
406 KB
Volume
609
Category
Article
ISSN
0168-9002

No coin nor oath required. For personal study only.

✦ Synopsis

A lens system consisting of two electrostatic quadrupole triplets has been designed and constructed at the Radiological Research Accelerator Facility (RARAF) of Columbia University. The lens system has been used to focus 6-MeV (4)He ions to a beam spot in air with a diameter of 0.8 Β΅m. The quadrupole electrodes can withstand voltages high enough to focus (4)He ions up to 10 MeV and protons up to 5 MeV. The quadrupole triplet design is novel in that alignment is made through precise construction and the relative strengths of the quadrupoles are accomplished by the lengths of the elements, so that the magnitudes of the voltages required for focusing are nearly identical. The insulating sections between electrodes have had ion implantation to improve the voltage stability of the lens. The lens design employs Russian symmetry for the quadrupole elements.

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