MA-PMT tests at Tsukuba
Pictures of a setup for MAPMT
measurements.
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Consists of a N2 laser, whose UV light
(337 nm) is guided thru a fiber optic cable
and is used to excite a
Bicron scintillator tile
with a 0.83-mm diameter
Y11 wavelength-shifting fiber imbedded in the groove.
One end of the fiber goes to
a reference tube, H1161 with
a green-extended photocathode,
and the other end goes to a fixture
on top of the MAPMT.
The MAPMT sits on
a 2-dimensional scanner,
so effectively the fiber scans over
the surface of the MAPMT.
The whole thing (except the laser itself)
is inside a dark room.
Results
A scope photo.
Example plots.
For illustration purposes only. No conclusions
should be drawn about gains etc.
The above setup (N2 laser light source, scintillator)
has become obsolete
since the introduction (Oct 2002) of a blue diode
laser (fast!) that illuminates Y-11 fiber directly.
Drawings of the tube housing box
placed on the scanner.
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Results from the new setup
Schematic diagram of the new setup with blue laser.
CDF note (6245) posted Jan 10, 2003
- English-only version for STK
More plots
B-field tests:
Hamamatsu measurement of B-field test
from "Photomultiplier Tubes, Basics and Applications", Hamamatsu Photonics,
2nd Ed., 1999.
Our own measuremens
Last modified: Sun Apr 16 17:56:19 JST 2006