This directory contains an updated ESS source component for use with McStas 2.x and 1.12c.

The component comes with a library of ESS source brilliances, including:

An important detail about the 2014-pancake moderator is that the component origin is NOT at the centre of the cylindrical cold source, but instead at the middle of the front face of the cylinder. For technical reasons, neutrons are in this case propagated from a tangential plane through that point.

We hope you will find this useful even though the official McStas 2.1 is still pending... (We are still hunting a couple of bugs, release will be post vacation-season 2014)

Peter Willendrup