Beam Profilers Display
David Luc, Informatique Machine Groupe
(Data Processing Team)
GANIL, FRANCE
At Ganil until now, the ion beam profilers were processed by an analog
acquisition and displayed on scopes in the main control room. To use better
tuning beam methods, it was necessary to get the profilers data in a digital
way so it can be possible to calculate the half-height width, the barycenter
and so on. Some VME modules were developed by the electronic team for the
multiwire profilers, and G64 crates, linked to the main VME were also developed
for the residual gas ionisation profilers. In a VME crate, a communication
server receives the requests from the stations, according to the different
available functions. There is one process for each function, so that
simultaneous requests can be satisfied. These processes find their data in a
server which is started by an interrupt at every end of the acquisition cycle.
Then the computed data are sent by the LAN to the asking station. As graphical
user interface, an Ada program on VMS workstations manages all the Motif
widgets for the pop-up menus dedicated to the operator's choices, then displays
and refreshes the graphical representation of eight beam profilers. The
profilers data can also be archived for later comparaison with other beams.