Sep 12 – 17, 2021
University of Birmingham
Europe/London timezone

The coordinate sensitive detector based on the MA-20 multianode PMT with high space and time resolution

Sep 16, 2021, 8:01 AM
1m
Teaching and Learning Building (University of Birmingham)

Teaching and Learning Building

University of Birmingham

Edgbaston Campus University of Birmingham B15 2TT UK
poster Position Sensitive Fast Timing Detectors Poster Session 4 (Position Sensitive Fast Timing Detectors)

Speaker

Valeri Brekhovskikh (Institute for High Energy Physics of NRC Kurchatov Institute (R)

Description

The work is dedicated to the discussion of the possibility of creating a position-sensitive detector
with both high coordinate reconstruction and time resolution. The work is presented the simulation
results and the experimentally obtained data for a prototype detector on the basis of
a multianode PMT MA-20 and a linear assembly of scintillating crystal or plastic strips.

The multianode position-sensitive PMT MA-20 has a semitransparent bi-alkaline photocathode
with the size of the sensitive area of $10 \times 200\ mm ^2$, 20 evaporated type bi-alkaline
dynodes of the same length and 20 separate anodes.

An assembly of scintillating strips made of GSO (gadolinium orthosilicate) crystals
with an element size of $3 \times 10 \times 50\ mm^3$, or of BGO (bismuth germanate)
crystals with an element size of $5 \times 15 \times 40\ mm^3$ also, and finally
set of plates made of a plastic scintillator
were used for experimental measurement of a coordinate resolution of the detector
prototype. Coordinate resolution was determined by the position of the center
of gravity of charges from neighboring dynodes.

The use of a multi-anode photomultiplier in combination with the array of crystal or plastic scintillators allows one to get the detector with a high performance in both
spatial and time resolution and also a low level of intrinsic noise in comparison,
for example, with silicon PMT’s. An ideal resolution simulation was performed for
a system consisting of a one-dimensional array of scintillation strips.
The experimental dependencies of the signal value versus position of optical
fiber with a diameter of 1 mm on the photocathode of the 20 anode PMT were also
measured. As a result of
processing the collected data, space resolution was obtained
at level of $\pm 0.7\ mm$, with a time resolution of
around $\pm 1.0\ ns $.

email brekhovs@ihep.ru
Title Dr
Nationality Russian
Your name Valery
Institute NRC “Kurchatov Institute” – IHEP

Primary authors

Presentation materials