Epics Applications using PyEpics

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Stable Releases:     cars.uchicago.edu

Development:     github.com

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Python Epics Applications

PyEpics Apps contains several Epics Applications written in python, using the pyepics module (see http://pyepics.github.com/pyepics/). Many of these are GUI Application for interacting with Epics devices through Channel Access. The programs here are meant to be useful as end-user applications, or at least as examples showing how one can build complex applications with PyEpics. Many of the applications here rely on wxPython, and some also rely on other 3rd party modules (such as Image and SQLAlchemy).

The list of applications should be expanding, but currently include:

AreaDetector Display

An application to control and view images from an Epics Area Detector. The controls available in this viewer are minimal, but you can change mode, exposure time and frame rate, and start and stop the Area Detector. The image can be manipulated by zooming, rotating, and so on.

Step Scan

A (work in progress!!) scanning program.

Strip Chart

A simple "live plot" of the recent history of a set of PV values, similar to the common Epics StripTool. Time ranges and ranges for Y values can be changed, and data can be saved to plain text files.

Epics Instruments

This application helps you organize PVs, by grouping them into instruments. Each instrument is a loose collection of PVs, but can have a set of named positions that you can tell it. That is, you can save the current set of PV values by giving it a simple name. After that, you can recall the saved values of each instrument, putting all or some of the PVs back to the saved values. The Epics Instrument application organizes instruments with tabbed windows, so that you can have a compact view of many instruments, saving and restoring positions as you wish.

Sample Stage

A GSECARS-specific GUI for moving a set of motors for a sample stage, grabbing microscope images from a webcam, and saving named positions.

Motor Setup

An application for setting up and saving the configuration of Epics Motors. For each opened motor, a full setup screen is shown in a tabbed notebook display. A paragraph for a Motors.template file can be saved for each motor, or copied to the system clipboard. In addition, you can save and read "known motor types" to a database, which holds most of the motor parameters.

The Local version uses a local sqlite database to store and read the known motor types, while the GSE version (which works only at GSECARS, of course) connects to a mysql server on the GSECARS network to store are read the known motor types.

Ion Chamber

This non-GUI application is synchrotron-beamline specific. It reads several settings for the photo-current of an ion chamber and calculates absorbed and transmitted flux in photons/sec, and writes these back to PVs (an associated .db file and medm .adl file are provided). The script runs in a loop, updating the flux values continuously.

XRF Collector

This non-GUI application interacts with a small epics database to save data from a multi-element fluorescence detector. The script runs as a separate process, watching PVs and saving data from the detector on demand. Associated .db file and medm .adl file are provided.