Users guide

exp

Open the bliss session to collect data/ make scans

shexp.open()

To open the shutter

shexp.close()

To close the shutter

ruby

To go to the “camera” position: to measure pressure

beam

To go to the “beam” position: to collect X-ray data

dscan(motor, -n, n, step, sec)

• Motor: ceny for the horizontal pos// dacz vertical one
• -n, n: starting and final position. In mm
• Step: number of points taken for the scan. Usually 40
• Sec: acquisition time. Use 0.1

goto_cen()

Go to the centre of the scan

goto_peak()

Go to the peak of the scan

umv(motor, ± number)

• Move the sample stage in the given (number) position
• Motors: dacz, ceny, IVU20c, pace1_axis, pace2_axis

umvr(motor, ±number)

Move the sample stage, relatively, of number millimetres

tweak(motor, 0.1) than + or -

Move the selected motor of 0.1 mm in + or -. Pressing again + or – will move again. Press any other key to exit.

wa()

Display the position of all motors

wm(motor)

Display the position of the selected motor

name of the motor

Gives all the info about the chosen motor

POS1.update()

Save the position in which you are as POS1 (same for POS2, POS3)

POS1.go()

Go in POS1.

POS1()

Gives the values, in ceny and dacz, of POS1.

oscillation

Displays all the parameters of the last oscillation

oscillation(-32,32,0.5,0.2)

Collect data: from -32° to +32 °, step 0.5°, counting 0.2 second/frame

oscillation.run()

Recall the previous used data collection

oscillation.one(-1,1,1.5)   

take only one frame, from -1° to +1°, counting 1.5 seconds

  Mesh 2D

  oscillation.dmesh(ceny, -0.1, +0.1, 2, dacz, -0.1, +0.1, 2)

  In this way the 9 measures will be collected accordingly to the following grid

  NB looking at the camera ceny is increasing from the right to the left; dacz from the bottom to the top;

 the point N5 will be in the centre (ceny=0, dacz=0)

 Please note that there is little sense to create a grid with step lower than the size of the beam

IVU20c

GAP; for SC between 12 and 12.6, for powder between 7.05 and 7.21

ceny

Move the sample stage along the horizontal direction

dacz

Move the sample stage along the vertical direction

cenx

Move the sample stage on the beam direction

decx

Detector-sample distance, usually 180 mm for single crystal, 250 for powder

dacrot

Control the omega rotation of the sample stage

shexp

Move the beam stopper

la

Change the power of the laser for ruby measurement

pace1_axis

Control the pressure of the membrane (gate pace1)

pace2_axis

Control the pressure of the membrane (gate pace2)

pace1 or pace2

To see the pressure (P) of pace1 or pace2. You will see two things:

input: pace1_in@ n bar      which is the pressure in the tank (same if pace2 is typed)

output: pace1_out@ n bar  which is the pressure in the membrane

pace1.setpoint= n

To set the P of pace1 to n. While pressure increases you can type other commands

umv(pace1_axis, n)

To set the P of pace1 to n. While pressure increases you can’t type other commands

n has to be >0.1 bar

pace1.ramprate= n

It changes the ramp rate to n bar/min (if 0 is set the speed is maximum)