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Message ID: 450     Entry time: Fri Apr 25 15:44:21 2008
Author: steve 
Type: Update 
Category: PSL 
Subject: scattering measurments 
In pursuit of a low back scattering, high power beam dump we looked at materials such:
polished copper, polished aluminum, diamond cut aluminum, variety of polished & heat treated stainless steel and shades of black glasses.
Black glass is ideal at low power. Superpolished SS 304 #8 is the only material that measures close to bg
We are still looking for a conductive low back scattering material that would be ideal for a good high power beam trap.

Black glass-shade 12, ss304 superpolished #8 and white paper-B98-24lbs back scattering were compared at 1064 nm

Atm 1: data plot numbers from front panel of SR830 display,
sensitivity: 1x1 mV for bg and ss
1x1 V for wp

Atm 2: drawing of measurement set up
Atm 3: SR830 lock.amp settings
Atm 4: view from steering mirror
Atm 5: view from black glass trap
Atm 6: white paper
Attachment 1: scatmeas20080425.xls  22 kB
Attachment 2: scattring_set_up_20080425.ppt  30 kB
Attachment 3: sr830settings.pdf  1.399 MB  | Hide | Hide all
Attachment 4: viewfmirror.pdf  1.269 MB  | Hide | Hide all
Attachment 5: viewfbgtrap.pdf  1.476 MB  | Hide | Hide all
Attachment 6: wpnmount.pdf  793 kB  | Hide | Hide all
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