INITIAL IMAGES FROM A 24-WIRE LIQUID XENON Y -CAMERA. Page: 3 of 5
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279 KeV Phofopeak
Anode Dia.- 5p
- = Best Fit - Single Wire Chamber
(Ref. 3)
" = 24 Wire y Camera
-
5 i .5 2 2.5 3 4
Kilovolts - Single Wire Chamber1 2 3 4 5 6 7
Kilovolts - 24 Wire y Camera8
XBL 72IO-5708r-
C
0
U-279 KeV Source
0"
0
"e
9_____ __
0
-0~-~- - - -
2 3
0%5
sm
-U " -" ~
Pus Hegh (1*solm sFigure 3. Pulse height vs voltage for the 5-11 wire
in the y- camera superimposed on the best-fit curve
to data from the single-wire chamber. Due to dif-
ferences in geometry, the voltage scales differ by
a factor of 2.2.
in gaseousxenon at I atm pressure. This is surpris-
ing, as this ratio might have been as high as 500, the
ratio of the densities.
Results
In the multiwire detector chamber we found that due
to differences in geometry the voltage required to ob-
tain the same gain is higher than in the cylindricalFigure 4. Energy resolution in the
wires). At 3000 V the resolution is
(lower curve) and at 4400 V the
19% FWHM (upper curve).camera (5-
22% FWHM
resolution isgeometry by a factor of 2.2 for both 3.5-11 and 5-11
wires. Figure 3 shows the 5-11 wire pulse height vs.
voltage data in the y-chamber superimposed on the
single-wire-chamber data.
Operation at the higher voltages may cause break-
age of the wires. The problem of wire instability at 3
high electrostatic forces has been treated elsewhere.
In order to solve this problem the wires have been
supported by quartz fibers. In the 3.511 case, the
wires were supported by three pairs of quartz fibers
and a gain of 70 was obtained at 5.5 kV. In the 511
case the wires where supported only at the center, asFigure 5. The individual wires of the anode plane
imaged on an X-Y plotting oscilloscope using a
Hg203 source collimated to a circle 2 mm FWHM
at the chamber. The vertical coordinate corre-
sponds to position; and the horizontal coordinate
was assigned at random by allowing an oscillo-
scope circuit to sweep periodically. The source
is moved a distance equal to the wire spacing
(2.8 mm). In this case readout resolution is
better than the wire spacing, and the wires are
clearly resolved due to their electrostatic focus-
ing property.
-2-100
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Zaklad, Haim; Derenzo, Stephen E.; Muller, Richard A. & Smits,Robert G. INITIAL IMAGES FROM A 24-WIRE LIQUID XENON Y -CAMERA., report, December 1, 1972; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc902217/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.