Why is this calorimeter a need in the low energy deuteron
experiment ?
Because it requires an absolute beam current measurement with less than
1.0% accuracy.
The problem is that the present
absolute current calibration system is designed
for currents
greater than 50µA, and the experiment will
involve a
beam current around 1µA, so that
the experiment needs a new
calibration device.
In the calorimeter, the energy absorbed is a function of the average
beam current, and is
also given by the product between the increase of
the temperature in the calorimeter and
its specific heat (see the operating
principes page for more).
other links :
calorimeter
: operating principes
technical
datas, pictures, drawings
temperature
detectors' calibration
results
other documentation
glossary
last update : 27 july 06 by
rousseau@jlab.org