Notes

Outline

Python Applications for beamline control/analysis Tim Mooney ca_util.py      – thin layer above CaChannel plot.py           – display 1D of a scan readMDA.py – read MDA file format detView.py    – display images from 2D scan

ca_util.py Automatic dictionary:          PV name :  CaChannel object caget(PVname) caput(PVname, value) caputw(PVname, value) camonitor(PVname, python function, user args) caunmonitor(PVname)

plot.py

readMDA.py from readMDA import * d = readMDA(filename, max_dimension, verbose, help) returns a list:       d[0] – dictionary of scan-environment variables (mostly PV names)             e.g., d[0][‘2idd:mca1.R2LO’] = (‘ROI_2_LEFT:’,’’,[342])       d[n>0] one dimension of the scan, with the following fields:       time            - date & time at which scan was started       scan_name - name of scan record that acquired this dimension       curr_pt       - number of data points actually acquired       npts            - number of data points requested       nd               - number of detectors for this scan dimension       d[]              - list of detector-data structures       np               - number of positioners for this scan dimension       p[]              - list of positioner-data structures       nt                - number of detector triggers for this scan dimension       t[]               - list of trigger-info structures

readMDA.py each detector-data structure (e.g., d[1].d[0]) has the following fields:       desc           - description of this detector       data           - data list       unit            - engineering units associated with this detector       fieldName - scan-record field (e.g., 'D01') each positioner-data structure (e.g., d[1].p[0]) has the following fields:       desc                    - description of this positioner       data                    - data list       step_mode          - scan mode (e.g., Linear, Table, On-The-Fly)       unit                     - engineering units associated with this positioner       fieldName          - scan-record field (e.g., 'P1')       name                  - name of EPICS PV (e.g., 'xxx:m1.VAL')       readback_desc   - description of this positioner       readback_unit    - engineering units associated with this positioner       readback_name  - name of EPICS PV (e.g., 'xxx:m1.VAL')

detView.py Requires numeric.py from readMDA import * from detView import * d=readMDA(“2idd_0004.mda”) detView(d[2].d[0:15],scale=(2,2),columns=5)