7. Command cheatsheet

This section provides a quick summary of the data acquisition commands discussed in the previous sections.

Stopping a measurement

To stop any command do Ctrl-C Ctrl-C

That is, hit Ctrl-C twice!

This will pause the running command and return you to the command line.

Do RE.resume() to continue the command from where it stopped.

Do RE.stop() to fully stop the command.

Note

Parentheses – () – are an essential part of the syntax. Same for RE() and % when specified.

7.1. Helper commands

These commands bypass the run engine and are intended for command line use only.

shb.open() / shb.close()

Open / close the photon shutter ➡ Section 2.5.1

%ct / %ct N

Count the monitor for the current dwell time, or count the monitor for the specified time

%ctm / %ctm N

Count the monitor nd the Mythen for the current dwell time, or count the monitor for the specified time

%att N

Set the attenuator level between 0 and 15 ➡ Section 2.3

%dt N

Set the dwell time to a value in seconds. If the value cannot be interpreted as a number, it will be set to 0.5 seconds.

7.2. General commands

show_symbols()

Print device and plan names to the screen

RE(mv(delta, <value>))

Move any named motor TO a position (delta is an example) ➡ Section 2.1

RE(mvr(delta, <value>))

Move any named motor BY an amount (delta is an example) ➡ Section 2.1

RE(mv(attenuator, N))

Set attenuator, N is an integer between 0 and 15 ➡ Section 2.3

RE(mv(slits.vsize, 0.15))

Set the goniometer slit size ➡ Section 2.2

RE(mv(dwell_time, 0.5))

Set measurememt time ➡ Section 3.1

RE(count([detector], N)) / RE(count([detector1, detector2, ...], N))

Count on a detector N times. Detector can be struck, mythen, etc. Can also be a list of detectors.

RE(linescan(<motor>, <detector>, <start>, <stop>, <N>))

move a motor, plot a signal ➡ Section 4.1

RE(pluck())

Select a point from a plot on screen and move that motor to that position ➡ Figure 4.1

7.3. Refine beam shape and position

RE(mv(m2.yaw, 0.01))

Adjust M2 yaw ➡ Section 2.5.3

RE(mv(m2.lateral, 0.01))

Adjust M2 lateral position ➡ Section 2.5.3

7.4. Alignment scans

RE(align_slits())

Align slits around beam and make beam position at slit position = 0 ➡ Section 4.3

RE(linescan(dethor, 'mythen', -3, 3, 61)

Align the dethor motor to center detector on beam ➡ Section 4.4

RE(mythen_calibration(-4, 1, 1001))

Mythen calibration routine ➡ Section 4.5

7.5. Measurement scans

RE(xrr())

Make an XRR scan