HSA config files (*.hsa)
3.2 Nomenclature
In this chapter we use the following terms to describe the HSA3500 (plus) Power Sup-
ply.
3.2.1 Mode
1. An HSA3500 mode corresponds to an interconnection configuration and par-
ticular voltage level and polarity settings for each card.
2. A voltage or energy which can be set by the control software is called a lo-
gical voltage. Each logical voltage must be defined before it can be used in a
HSA3500 mode definition. The range and the step size of the logical voltages
can be different for different mode definitions. Voltages with fixed values
within the configuration file can not be set by the control software.
3.2.2 DACVoltage
The various voltages are supplied by a HSA3500 HV module (via a digital to analog
converter). The output voltages results from the DAC voltages modified by the back
plane interconnections. All DAC voltages must be defined in a HSA3500 mode.
3.2.3 Natural Cubic Spline
A spline is a series of cubic polynomials. Each cubic polynomial goes through a set of
consecutive values. The cubic polynomials are adjoined continuously and smooth. If
the second derivatives at both endpoints are zero the spline is called a natural cubic
spline.
Natural cubic splines are used in the HSA3500 configuration file to describe nonlin-
ear relations between logical voltages and DAC voltages.
3.2.4 Syntax and Encoding
A HSA3500 configuration file is an ASCII text file. Each file contains a fixed header
and a sequence of sections. Comments may appear throughout the file.
28 HSA3500 / HSA3500 plus Power Supply
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