TSSP: Virtual Secondary Database

A database of simulated performance of around 13,500 secondary resonators, for the purposes of establishing empirical relationships between coil geometry and the various equivalent reactances and performance measures.

Updated: 19 Jul 2008


The range of typical Tesla secondary resonator dimensions or 'configuration space' is spanned by the seven parameters of length, diameter, base height, wire size, spacing ratio, toroid width, and toroid height. We explore this space by analysing a representative sample of imaginary resonators modeled with the simulator. The database is intended to contain sufficient samples along each axis of the configuration space to enable reliable curve fitting to be done.

Resonators are simulated as if they were in free space above a ground plane of radius equal to the height of the top of the secondary above the ground plane. This database only covers coils driven directly through their base terminal. Only coils with up to 3000 turns are considered. Data generation required about 30 days of computation using a 14 processor Beowulf Cluster.

Some graphs of the data are available - see view. Some of the results of curve fitting can be found in formulae


The database contains 13578 records. These can be downloaded through the following link.

vsd.data.gz Unix format, gzipped, 662 Kb. Space separated fields, newline separated records.

If you discover any interesting relationships amongst the data, or find a useful curve which fits, then do let us know.

  Data Record Format

Each record contains the following fields, shown with field number in brackets. First the record header info...

Next are the input parameters - the resonator description...

Now for the output results, starting with the resonant frequencies...

Then the equivalent reactances of the resonator...

And finally, some performance measures...

Notes: The fields given above are in the order in which they appear across a record. If data is imported into a database, it is recommended that the suggested field names are used, so that queries can be exchanged more easily. The records are stored in no particular order within the data file. The fields 19, 20, and 22 are of limited accuracy due to the lack of an effective model of resonator losses.

Maintainer Paul Nicholson, tssp0807@abelian.org.