CDC 06 02 2008

1 News on the noise issue

Inspired by Gerard's visit and equipped with his differential probe I had a first look at a non-oscillating preAmp. I put 1900 V on the straws and checked all connected straws and they are all looking good (= I see signals). Time to do some additional noise studies.

Setup:

*) 16 armed straws
*) HVDB that Gerard brought with him
*) new preAmp, also the one the Gerard brought with him
*) 1.5 meter cable + differential probe (which attenuates the signal 0.366x) (NO shaper) + scope

The VME crate was switched off, the only thing on (within a radius of 10 m) was a PC and a NIM crate.

I took a first look at the noise (shown in figure 1.1)