h , k , l
Input fields for a movement.
It is started by pressing the <ret> key.
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start_h, start_k, start_l
The starting point of the q scan, the default is the current position,
the translations of start_ () or the qualifiers
/_start_.
START_Q is created when the scanning routine is
exited.
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stop_h, stop_k, stop_l
The end point of the q scan, the default is the current position,
the translation of stop_ () or
the qualifiers /_stop_.
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n_points
The number of points per scan. The default is 100, the
translation of n_points_q or the qualifier /_n_points.
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ssa
A flag that determines whether or not a simple scan analysis is performed
automatically. SSA is done before after_q_scan.gra is called.
The default is 0, the translation of ssa_q or the qualifier
/_ssa. The user may specify that there is no background
subtraction by issuing the /_ssa_nbs=1 qualifier.
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sample_time
The sample time can be used in during_q_scan.
The default is 1, the translation of sample_time_q or the
qualifier /_sample_time.
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auto_return
If this flag is set, ONLINE moves the motors after the scan back to
their initial positions. The default is 1, the translation of
auto_return_q of the qualifier /_auto_return.
If the flag is set to 2, 3 or 4 and SSA
completed successfully, the motors are moved to the MIDPOINT, the CMS
or the peak.
If AUTO_RETURN is set to 5, the motors return to the start-of-scan values.
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auto_filter
If this flag is set, there will be an automatic attenuation of the beam.
The routine that adjusts the absorber uses the symbol signal
as the input and moves the motor diff_absorber (not all
beamlines need definitions of diff_absorber, e.g.: E2),
if it is necessary:
If the current signal is above filter_max, it increases the
current absorber position by filter_delta. Likewise, if the
signal is below filter_min the absorber position
is reduced by filter_delta.
The default is 0, the translation of auto_filter_q or the
qualifier /_auto_filter.
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Scan mode
This is an item from the UB matrix. It can
have the values "Bisecting", "Const. plane", "Fixed PSI"
“Fixed Phi” or “Fixed Om2” (omega-two_theta/2).
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Param.
The value that is used for the
"Fixed Psi", “Fixed Phi” or “Fixed Om2” mode.
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Scan_name
The scan name. ONLINE creates this scan,
clears it. The x-values run from 0 to 1.
The default scan name is scan_name_q or the
the qualifier /_scan_name.
If the scan name is empty when the scan starts, ONLINE chooses
scan_q_date_time.
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Comment
A comment line. It is copied to the first
comment line of scan_name.
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before_q_scan
The command file which is executed before
a scan is started.
The default name is the translation of before_q_scan or
before_q_scan.gra.
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during_q_scan
The command file that is executed at every stop. It contains
a list of commands that is read once for each scan.
Statement blocks (if, for, case) are not allowed in this file in order to
save CPU time.
If such constructs cannot be avoided,
during_q_scan must call
a file with a run command. Note that there is a single
line if-statement. This may
appear in during_q_scan.
during_type_scan may set the symbol interrupt_scan
to tell online
to interrupt the scan.
The default name is the translation of during_q_scan or
during_q_scan.gra.
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after_q_scan
The command file which is executed after
a scan is finished.
after_q_scan may use the symbol interrupt_scan to decide
whether the scan has come to a normal end or not.
The default name is the translation of after_q_scan or
after_q_scan.gra.
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The following symbols are created by the scan routine in order
to have them available in the command files: