Define Scan

Name:  define_scan - define a region scan

Description:  define_scan is used to set up the CHESS region scan definition. 

There are six scans available:

1. chess_escan - multiple-region energy scan. Region endpoints for the scan are absolute and should be given in keV.

2. chess_rescan - multiple-region, relative energy scan. Region endpoints are relative (that is, they will be interpreted as being relative to the monochromator energy at the start of the scan) and should be given in keV.

3. chess_kscan - multiple-region electron-wavenumber (k) scan. Scan is relative to the edge energy; negative units are given to indicate pre-edge energies, while positive units denote post-edge k - k0 values. See the extended information on chess_kscan

4. chess_ascan - multiple-region, single-motor absolute scan. Region endpoints are actual positions, and units depend upon the motion that is controlled by the motor.

5. chess_dscan - multiple-region, single-motor delta scan. Region endpoints should be specified relative to the starting position, in units that correspond to the motion controlled by the motor.

6. chess_xswscan - multiple-region, x-ray standing wave scan. Two xswscans are available: xsw_abscan (absolute), and xsw_relscan (relative).

Up to 10 regions may be specified, and monitor or timer normalization may be selected individually for each region. The macros start or mstart are used to begin execution of the defined scan. scan_on or resume may be used to continue chess_ascan and chess_escan following an abort; the relative scans and XSW scans may not be restarted.

Last Update: 2006-09-21