Speaker
Herve Marie Xavier Grabas
(CEA - Centre d'Etudes de Saclay (FR))
Description
We describe an inexpensive micro-strip RF anode designed to measure
the time and position in large-area MCP-based photo-detectors. The
anode has been optimized to match the bandwidth of the intrinsically
fast MCPs (risetime < 1ns). The timing, two-dimensional position, and
energy of the MCP pulses are extracted by fast waveform digitization
at both ends of the anode micro-strips. The anode geometry consists
of 30 equidistant, silver microstrips silk-screened on a 20cm-by-20cm,
2.75 mm-thick, Borofloat glass plate. A solid ground plane is
referenced on the opposite side of the glass. The anode is measured to
have an analog bandwidth of 2 GHz (175 ps risetime), cross-talk
coupling between strips of -10dB, and impedance control of the 50-ohm
lines of better than 10% over the entire bandwidth. The anode
geometry and construction allows for multiple anodes to be connected
in series, efficiently increasing the photosensitive area for the same
number of electronics channels.
Author
Herve Marie Xavier Grabas
(CEA - Centre d'Etudes de Saclay (FR))
