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*** MEGHA:ANU:July94 - PL ***
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Feasibility testing of the 2 telescope Gas/Silicon
Multi Element Gas Hybrid Array (MEGHA). Performed
at the ANU in Canberra in July 1994.

Equipment inventory:
zero degree MEGHA module, consisting of:
two Intertechnique PSDs
gas Ionisation detector (propane @ 60 torr)
two CsI(Tl) scintillators (inoperable)

Beam energy: 150 MeV
Primary Reaction: 12C(24Mg,12C,12C)12C

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Diagram listings:

EDE.ps:

E vs. dE trace showing traces of carbon, oxygen,
neon, magnesium (with 'elastics peak'), aluminium
and silicon. Poor resolution makes it difficult
to resolve the last three traces individually.

chamber.ps:

Schematic showing locations of elements positioned 
within the 2 metre scattering chamber at the ANU.

circuit.ps:

Circuit layout of the data acquisition system,
showing logic systems, etc. NB: scintillator layout
omitted due to its non-functional nature.

d1xy.ps:

Typical output of Intertechnique PSD with calibration 
mask in situ. Note the pin-cushion distortion effect.

d1xyc.ps:

Pin cushion distortion of the PSD removed using a NAG
Fortran library bicubic spline routine.

d2ede.ps:

E vs. dE signal from the March 1994 testing at the
ANU: the silicon/scintillator ede system shows up a 
trace of alpha particles.

erel.ps:

Results of excitation spectra for various experimental
'runs'.

etot.ps:

Results of etot spectra for various experimental 'runs':
note the tendency of the three peaks to drift towards 
lower energies/chanels as time increases: a possible
depletion layer/leakage current effect? The three dashed
lines indiacte the predicted location of the three `Q'
peaks: energy loss in Mylar has not been compensated for
in these cases.

mask.ps:

The calibration mask used during the July 1994 tests: it
enabled one to determine the position of the points
needed in the bicubic spline routine (see d1xy.ps and
d1xyc.ps)

react.ps:

Schematic displaying the telescope arrangement during the 
experiments.

xy.ps:

As d1xy.ps, but with calibration mask removed.

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