Use of the EPID record for feedback at UNICAT
It became apparent from initial testing that the epid record provided by synApps would need to be wrapped with a database to provide some useful features for our users. A first cut at a database provided some very encouraging results. After revision, a second round of testing was arranged with a database used to provide active feedback to keep the beam vertical position constant (on the Oxford Quadrant X-ray Beam Position Monitor in 33ID-D) using the monochromator omega2 piezo as a positioner (in 33ID-C). When the sscan record was used to step-scan the XBPM vertical position, the new database performed quite well. The database was then further revised to the present form.