HOWTO Take a new FDC Flatness Scan

To performa new flatness measurement, do the following:

1. Make sure the driver box, VME crate, and Linux Desktop computer are all on

2. Verify that the laser is mounted in the proper set of mounting holes. If scanning a cathode plane, the mounting screws should be in the middle set of holes. If scanning the granite rock, the mounting screws should be in the holes closest to the granite surface.

3. Open a window on the Linux Desktop and type MeasureFlatness and hit return.

4. Type in the plane number at the prompt and hit return. If scanning the granite rock, use "999" for the plane number.

5. Type in the plane angle at the prompt. This needs to be a whole number without a decimal point. Round up if needed.

6. The laser should begin moving to the "Home" position and begin the scan shortly thereafter. It should take between 10 and 15 minutes to complete the scan and run the macros.

7. The results of the scan, both raw data files and plots produced by ROOT macros, will be placed in the /home/laser/FLATNESS/flatness_data and /home/laser/FLATNESS/flatness_data/images/XXX directories respectively where XXX is a unique name for the scan including the plane id, angle, and timestamp.

8. The Linux Desktop holding the scans is not connected to the outside network so any files must be retrieved via USB drive (or by writing them down ;) )

Contact

Please refer any questions to David Lawrence davidl@jlab.org x5567