Best ways to mount and size heat sinks for SCR thermal management and efficiency

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We are working with SCR based compressor control. There are different methods of connecting a heat sink to a device with different packages (with insulation/without insulation) which does matter in heat dissipation. We would like to know on how to keep the temperature down while still optimizing the size of the heatsink so as to meet Cost Targets or what are the different methods of using a heatsink with SCR?

The manufacturer of the SCR will probably have a lot of information on their web site on how to heat sink their products, application notes are the most likely source.
If they don't hunt around other SCR manufacturers sites.
The trade off with insulating the SCR from the heatsink is interesting. You will get worse thermal performance with insulators, so may have to increase the heatsink size or use a fan at worst. Against that you have a heat sink that may be at a nasty potential, meaning that it has to be isolated electrically and placed where access via the usually testing methods, i.e a standard human finger, cannot come in contact with it through holes in the enclosure. Small holes means more difficult heat removal. Just a quick thought, I am sure there will be other issues as well,
cheers,
Richard