Stephenson preamps

The Stephenson preamps have been used extensively for ECAL tests at CERN and elsewhere. The surface mount single channel cards are ~ 2 x 6 cm² in size.

Type 1    Single channel cards. Shaping time 25 ns,  used at H2/H4 test beams etc.
                Noise ~ 1100 electrons for 35 pF i/p capacitance.
                Max peak voltage out 2 V, driving into 50 ohm for an i/p charge of 2.10⁷ electrons (check!)
                Noise vs input capacitance, 1996 measurements pdf ps

Type 2   5 channel cards designed by Bristol. ~ 150 channels / 30 cards
               Tests by Tony Lodge, 15.7.2004 pdf   
                                                                      
                Card with noisy Qinj chips removed                          Original card with noisy Qinj chip
                and with replacement wire link to preamp I/P

                SC02 VIRGINIA    2000 BTCP R&D phase 3   HV cards and 5 channel Stephenson R/O 31.1.06

Type 3   Single channel cards, 1000 ns for use at the Brunel test rig
               40 single channel cards produced and sent to Brunel in 1999.

Documentation
Mods to reduce sensitivity of preamps for use with APDs, R Stephenson, 29.8.1996 doc

Preamp Purchases

Type 2:     5 channel card layouts proposed for purchase in 2001.
                Left type, ps pdf                 Right type ps pdf
                Left type, ps pdf                 Right type ps pdf

Type 1   May 1994             50
              March 1995        150
              Summer 1999       60

Usage
30 channels at Bristol, ~ 27 packaged into a read out box from the 1999 beam test at CERN, ~ 3 spare
30 channels returned from CERN, via Bristol on 23.3.2000
12? channels packaged into a readout box for ther minisupercrystal test in 1998
5 at Brunel for VPT tests
10 at RAL in R5.2 for VPT and ISIS test beam work
60 with T Lodge for 2 SC models, 2000.

147 Total