PbFl RadTests-12-3-07

Day 1. December 3, 2007.

Who: Pierre, +?

 Glass Slides at 10 cm, 30 cm, and 50 cm.  

Brett says the electron beam is focused to 1 mm in diameter before it strikes the exit window. After it passes throught the water-cooled exit window (Al 1mm - Water 1mm - Al 1mm), the beam swells to 0.6mm and at 30cm it the beam spot size is 2cm.

Here are two views of the exit window

 Beam spot size mapping in x and y with the Faraday Cup (FC) for z = 30cm from Window.  

We will move the table in or out depending on whether the beam spot size is greater or smaller than 2.0 cm. Translator table will be positioned at right position in z.

Linearity tests of the pickup coil and FC.

We will just change the width of the pulse and compare the readings from the pickup coil to that of the FC. Note that change in 1mV from the pickup coil corresponds to 1mA change in the instantaneous beam current.

Pulse Width (us)	pickup coil (mV)	FC
0.08
0.10
0.16
0.30
0.50
0.75
1.00
2.00

Here are Pictures of the Faraday Cup and the Pickup Coil

5 hours of beamtime
o Irradiate broken PbF2 Crystal for 0.5 h  and check the rate of the rise of temperature. 

Recall that we cannot exceed 10 K/h

o Place Crystals 1, 2, 3, 4 on translator table.
    * Crystal 1:  2 hours
    * Crystal 2:  1 hour
    * Crystal 3:  1 hour
    * Crystal 4:  0.5 hours
o Transparency Test (~3 hours)
o Blue Light curing (24 hours)