The Constant Luminosity Control System
Changing the pressure of the hydrogen at the nozzle aperture and the temperature
of the nozzle, it is possible to change the parameters of the clusterization process,
such as the speed of the clusters or the number of clusters formed. These parameters
affect the value of the density.
The following plot shows the curve of {pressure,temperature} values used by the
constant luminosity control system. On the same plot, it is possible to see the
corresponding values of density. The control changes the {pressure,temperature}
condition on that curve every 10 seconds, to increase the density, following the
drop of the current.
click here to get a postscript version of this graph.
Note that the Liquid/Gas saturation curve for hydrogen is very close to that
{pressure,temperature} path. The choice of this path, on which we have high
density and low background, has been possible due to the precision of the control
system for the nozzle pressure (1 psia) and temperature (0.1 K).
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