Quantitative analysis of large sextupole fields in a magnetic quadrupole lens

https://doi.org/10.1016/0168-583X(95)00436-XGet rights and content

Abstract

There is current interest in constructing small bore quadrupole lenses in order to obtain a high field strength for focusing MeV ions with a nuclear microprobe, but any mechanical asymmetries present generate parasitic sextupole fields which degrade the attainable spatial resolution. This problem is compounded with small bore radius quadrupole lenses since they have a bigger parasitic sextupole field than a larger bore radius quadrupole lens with the same mechanical tolerance. Shadow imaging is a very convenient method of quantifying parasitic fields present in small bore quadrupole lenses, and the extension of its use for measuring large sextupole fields is described here.

References (11)

  • G.R. Moloney et al.

    Nucl. Instr. and Meth. B

    (1991)
  • F.W. Martin

    Nucl. Instr. and Meth. B

    (1991)
  • D.N. Jamieson et al.

    Nucl. Instr. and Meth. B

    (1987)
  • D.N. Jamieson et al.

    Nucl. Instr. and Meth. B

    (1988)
  • M.B.H. Breese et al.

    Nucl. Instr. and Meth. B

    (1990)
There are more references available in the full text version of this article.

Cited by (0)

View full text