10.6.2003

Dear colleagues,

I will introduce a new device: screen III. You can find it on the GUI
diagnostics, click on screen III at TV system.

Inside this port are
- an empty tube
- a quartz plate
- an OTR screen
- an YAG screen
- an aerogel radiator

The YAG screen is to see the transverse dimensions of the beam,
the empty tube to pass the electrons to the devices behind the screen III,
quartz, OTR and aerogel are for the measurement with the streak camera.

When you want to use one of them you have to move the actuator to a
certain position. The positions for each screen and tube are written
on the GUI. E.g. to use the YAG move the actuator to position -72 mm.
Then use the camera to see the transverse size. To measure the bunch
charge or to measure with the wire scanner use the empty tube at position
0 mm.

Best regards,

                Dirk

--
Dirk Lipka, dlipka@ifh.de
Phone +49 (0)33762 7 7280
Fax   +49 (0)33762 7 7330