Beam Test of a Segmented Foil SEM Grid

Details Beam Test of a Segmented Foil SEM Grid Beam Test of a Segmented Foil SEM Grid

2005-07-29

arxiv.org/abs/physics/0507211v1

Nucl.Instrum.Meth.A554:138-146,2005

Physics

Instrumentation and Detectors

submitted to Nucl. Instr. Meth. A

Scientific paper

10.1016/j.nima.2005.08.076

A prototype Secondary-electron Emission Monitor (SEM) was installed in the 8 GeV proton transport line for the MiniBooNE experiment at Fermilab. The SEM is a segmented grid made with 5 um Ti foils, intended for use in the 120 GeV NuMI beam at Fermilab. Similar to previous workers, we found that the full collection of the secondary electron signal requires a bias voltage to draw the ejected electrons cleanly off the foils, and this effect is more pronounced at larger beam intensity. The beam centroid and width resolutions of the SEM were measured at beam widths of 3, 7, and 8 mm, and compared to calculations. Extrapolating the data from this beam test, we expect a centroid and width resolutions of 20um and 25 um, respectively, in the NuMI beam which has 1 mm spot size.

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