Computing for Science

The Computing for Science (CS) group supports ILL scientists, students and visitors in a number of activities including data analysis, instrument simulation and sample simulation.

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All Software

The Custom Routines (depending on the instrument)

1. Instrument Setup (IN6)

This window shows the instrument setup, and gives access to setup procedures and main parameters.

This window enables to change IN6 Instrument configuration (incident energy,
monochromators, choppers, and time-of-flight). It displays the incident energy
being used, or to be changed. Both menu and buttons lead to the display, and
eventually the modification, of the current settings.

[Auto]
   perform an automatic energy change for each specified process (when "auto"
   boxes are checked), in the order (only in SuperUser mode):
   1-choppers and TOF settings,
   2-monochromators positioning,
   3-check of the elastic peak position.
[Choppers]
   display Choppers and TOF settings (speed, phase, times), and
   enable their setting (only in SuperUser mode)
   A detailed Choppers/TOF status may be displayed.
[Monochromators]
   display Monochromator settings (energy, position), and
   enable their setting (only in SuperUser mode)
[Elastic Peak]
   measure and display Elastic Peak position
[I think all is already OK]
   If you consider the instrument setup to be already completed (i.e. you have 
   done the setup process by your own), then select this item to tell Light all is OK.
[STOP]
   Stop all current settings and countings processes

2. Instrument Setup: Choppers (IN6)

 IN6 Choppers settings Help in "Light on George"

This window dialog enables to compute and set the IN6 Choppers and
Time-Of-Flight settings. It displays the current configuration, with the
wavelength that is currently used on the instrument or a new value that was
changed by the user.

IN6 neutron beam that exits from the 3 Monochromators first encounters the
Fermi chopper (horizontal rotating collimator), and then passes trough the
Suppressor chopper (classical disk chopper), that removes higher order and
background signal.

The Status line on top of the window indicates if the choppers are set for
the selected wavelength

[Details...] Displays full choppers/TOF settings
[Set]        Sets the choppers parameters, wait for stabilisation, and finally
              sets TOF parameters. This button is only active in SuperUser mode.
[STOP]    Stops all current settings and countings processes

3. Instrument Setup: Monochromators (IN6)

 IN6 Monochromator settings Help in "Light on George"

This window dialog enables to calibrate and set the IN6 Monochromators.
It displays the current position and rocking curve scans configuration, or 
new values that was changed by the SuperUser.

IN6 neutron beam exiting from the cold neutron guide illuminates three
monochromators mounted in series. Each of them reflects a monochromatic part
of the beam, occording to the Bragg law.
The three PG002 vertically curved monochromators focus to the sample
position, and these 3 beams (that have slightly different energies) are
chopped by the Fermi and Suppressor choppers, before coming to the sample.

The Status line on top of the window indicates if the monochromators are set
for the selected wavelength

[Rocking Curve] Starts a rocking curve process for each monochromator,
                computes maximum reflected flux position and position
                the monochromators there. These data are stored for further
                direct positionings. A plot showing the 3 monochromator
                reflected beam rocking curve. This button is only active in
              SuperUser mode.
[Position]      Position the monochromators according to a previously
                calibrated maximum flux table obtained from a rocking curve.
                The last column (optimum) in the Table is then used.
[STOP]          Stop all current settings and countings processes

4. Instrument Setup: Check of the Elastic Peak

 IN6 Check of the Elastic Peak Channel Help in "Light on George"

This item counts the signal for a short time, and determines the position of the elastic line on the TOF axis from Monitor1 and the integral of all Detectors. A graphic is displayed, as well as basic statistics.

5. Default Displays

This function enables to restore default displays for the experiment (e.g. detector map, projections and temperature log). You may extend this list any time, to look at other instrument parameters (see Displays).

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