Scan Parameters

The scan limits are specified using the following keywords: start, stop, delta, range and np.

Other useful keywords are:

auto_beam => 0
If set to '1', the scanning procedure is suspended during synchrotron injection phases and continues automatically afterwards.

auto_return => 1
This flag determines where the motors are moved after the scan: 0 no return, 1 return to the position where the scan started. 2, 3 and 4 are meaningful only, if there was a simple-scan-analysis (SSA). They select midpoint, cms or peak.

comment => "someComment"
A line of text that is displayed in the plot and written into the output file.

continuous => 0
If set to 1, selects continuous scans.

noalpha => 0
If set to 1, the default , the xterm window is not updated.

noconfirm => 1
If this flag is 1, the default, the output is written to a disk file without prompting the user for confirmation.

nodisplay => 0
If set to 1, no graphics is displayed.

nolog => 0
EXAFS feature: If set to 1, the flux ratios will be displayed on a linear scale.

preset => 0
If set to 1, the timer runs in the preset mode. If the Perl script is executed in the TkI environment, the Select Scan Devices value of this flag serves as the default.

generic_macro_name => "genericPart"
The generic part of the scan scripts, e.g. : generic_macro_name => "auto_scan" selects 'before_auto_scan.pl', etc. auto_scan is the default.

generic_macro_name_gra => "genericPart"
The generic part of the .gra scan scripts, e.g. : generic_macro_name_gra => "auto_scan" selects 'before_auto_scan.gra', etc. auto_scan is the default.

param => 12,
hkl scan feature, the psi angle.

range => 10,
np => 11
A way to specify a scan range. The first point of the scan is at current_position - range/2.

regions => 'yes'
regions_file => 'whatever.exa'
Select the regions scan type and optionally a regions file.

repeats => 3
The number of repeats.

sample_time => 0.2
The sample time [s], alias st.

scan_name => "scanName"
The scan name. Normally scan names are automatically constructed of a generic part, which is defined by the symbol generic_scan_name, and a number.

scan_par => 2
A scan parameter. Continuous scans use it for the sweep time.

ssa => 0
If set to 1, a simple scan analysis is executed. It is applied to the SCAN GQE which is referred to by scan_name. For non-EXAFS scans it is the first counter.

start => 10,
stop => 20,
delta => 1
A way to specify a scan range.

start => 10,
stop => 20,
np => 11
A way to specify a scan range.

title => "someComment"
Alias for comment.

update => 1
A number that specifies the update cycle.

wait_time => 0.2
The scanning procedure hibernates for this amount of time after the motors are stopped before it starts the measurements.