Performance of an expanding telescope used to obtain a low divergence H- beam

Details Performance of an expanding telescope used to obtain a low divergence H- beam Performance of an expanding telescope used to obtain a low divergence H- beam

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nimpa.312..397b&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 312, Issue 3, p. 397-414.

Physics

1

Scientific paper

An expanding telescope constructed by Los Alamos National Laboratory was installed at Argonne National Laboratory to produce a low divergence, 50 MeV H- beam. The telescope with a twenty times magnification consisted of a singlet eyepiece and triplet objective lens constructed from permanent quadrupole magnets. The output beam divergence was measured with a rms resolution near 1 μ rad using a pinhole membrane and an optical imaging system. This system also provided a measure of the third order geometric aberrations of the telescope by the displacement of the centroids in the projected image of a rectilinear array of pinholes placed across the beam diameter. The geometric aberrations were found to be in agreement with computer calculations, having magnitudes on the order of a few μ rad/cm3. Chromatic aberrations in the telescope were also found to be in agreement with theory. These measurements showed that the telescope achieved a nearly parallel beam with a divergence of less than 25 μ rad.
Present address: California Institute of Technology, Sub-millimeter Observatory, Hilo, HI 96720, USA.

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