Collecting a data set

How to collect a full data set

  1. Specify the experimental condition by clicking the [COLLECT] tab.

  2. Please note that in the case of MAD or SAD data collection, the radio button for MAD/SAD should be selected, and the data collection order should be specified (Peak, Egde, RemoteH, RemoteL) by checking each radio button. If the [Confirm] button from the CHOOCH analysis was not pressed, you'll need to input the corresponding wavelength manually in the respective boxes, or you can go back to the XAFS - CHOOCH tab and click the Confirm button.

  3. After setting the experimental condition, click the [Submit] button. →details
    The experimental condition you submitted is added in the dataset list shown in the Runs table.

  4. Check the experimental conditions in the Runs table. →details
    It is still possible at this stage to change the parameters included in the table. However, pushing the return key is necessary in order to confirm each modification. If you wish to delete from the list one data collection with its experimental conditions, select the corresponding row to be deleted by clicking on the line number (very left of the table), and click the [Delete selected] button.

  5. Click the [Start] button to start the data collection.

Experimental condition

  • >File prefix<
    Prefix of the image file name : should be less than seventy characters long, and can include alphabets and numerals.
  • >Osc. width(deg.)<
    Represents the oscillation width, by which the crystal will be rotated during exposure.
    Zero degree cannot be set, as it means that the crystal stays still.
  • >Exposure Time (sec.)<
    Represents the amount of time the sample will be exposed to X-ray irradiation.
  • >Max. resolution(Å)<
    Represent the maximum resolution measurable.
    This value is calculated from the energy of the wavelength, camera distance and camera height.
  • >Start (deg.)<
    Precise the starting oscillation angle.
  • >End (deg.)<
    Precise at which angle the oscillation is going up to (final oscillation angle)
  • >Inverse(frame)<
    This mode is effective for measurements of MAD or SAD data. It is measuring the opposite angle by setting the Frames/Wedge option.
    e.g.: Start (deg.) 90°, End (deg.) 270°, Omega width (deg.) 1°, Frames/Wedge=10
    - In such a case, the first data collection will start from 90 to 100° with 10 snapshot pictures.
    - The second data collection will start from 270 to 280° with 10 snapshot pictures.
    - The third data collection will start from 100 to 110° with 10 snapshot pictures.
    - The fourth data collection will start from 280 to 290° with 10 snapshot pictures.
    Finally, the data collection takes 180 snapshot pictures from 90 to 270°, and 180 snaps from 270 to 450°. So, the total number snapshot pictures is 360 frames.

Runs table

  • [Delete selected]
    The selected row is deleted from the table.
  • [Copy selected]
    The selected row is copied and added to the existing list in the table. Please note though that the run number counts up.
  • [Delete All]
    The table is completely cleared, empty of any settings.
  • [Start]
    Button to start the measurement of the various data, in a sequential manner (starting from the first row).
  • [Stop]
    The measurement is enforced to stop, after the currently exposed frame is collected.

Appendix:Snapshot And Collect Advance

Table of the readout settings for each beamline.
Initial setting of each BL snapshot collect
BL-1A off off
BL-5A hard hard
BL-17A soft off
NW-12A hard hard
NE-3A off off
  • > Wavelength<
    The energy of the coming X-rays.
  • >Detector position<
    1. Distance
      Represents the distance existing between the detector and the sample.
    2. Height
      Represents the offset value of the detector's height.
  • >Slit<
    Divergence: represents the deterrence of X-ray dispersion. In other words, it collimates the X-rays when the detector distance is far from the sample.
    Normal: the collimation is done with a single slit (Default).
    Parallel: the collimation is done with double slits. Although the intensity of the X-rays decreases, a high parallelism is obtained. This function is effective for the measurement of samples with large lattice constants.
  • >Transmittance<
    Represents the transmittance of the incident X-ray. The material used is aluminum.
  • >Data acquisition<
    1. Dark current:the initial image is revised (noise-reduced) with a dark image data.
    2. This program runs when the user selects the Yes radio button. The exposure time of the dark image will be the same as the initial image, meaning that the total exposure will take twice the time as what is specified in the settings.
    3. Binning:choice of the detector readout type.
      off:the readout type is in normal operation.
      software:the readout type is in software processing operation (meaning that the image size is one forth of the "binning off" picture size.).
      hardware:the readout type is in hardware processing operation (meaning that the readout time is even faster than when in software processing operation.).

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