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William Herschel Telescope


— Photometer —

First light (at ING): June 1992.

Designed and built by: Department of Physics, National University of Ireland, Galway.

Description: This photometer goes on several telescopes around the world, including WHT (Cassegrain and Nasmyth - GHRIL - focus). An array of dichroics splits up the incident beam in broad band regions, each region projected onto the detector. The photon-counting tube detects each photon arrival by knocking of an electron (photo cathode) which is accelerated through an electric field until it hits a micro channel plate which produces a shower of electrons. This shower is detected on a fine grid of wires and, using a techique called coincidence logic, the photons xy position is recorded together with the arrival time. The two-dimensional image builds up on the "MAMA" display. Furthermore, 3 fibres acts like single channel photometers (ADC). Detector size is ~ 1000 x 200 "resolution elements". Each element is 24 microns corresponding to 0.1" on sky. Field of view is ~ 100" x 20" 

Time allocations:
Nights scheduled since semester 2007B

M Redfern et al., 1992, "First Scientific Results from TRIFFID", Gemini Newsletter, 38, 1.

Research impact:

Scientific highlights (1)

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Contact:  (Public Relations Officer)
Last modified: 08 November 2023