Plan for the day was to connect a mechanical ground to the FEEs connected to DSSD0 1, 2, 3, 4, 9, 10, 11 and 12

This was done by connecting thick copper cable to the mechanical ground wires on the AIDA frame (These ground wires are connected to the platform ground which is earthed properly we are told)
Two thick copper wires were run each one for the top and right side and one for the bottom and left side.
Each cable was connected to the FEEs with a star of smaller cables going to the adapter boards.
Before connection the potential difference between the FEE ground and the mechanical ground was 16mV.
After connection the potential difference was 3-4mV.
It was checked that both the NIM ground and the PSU ground pins were on the same ground as the mechanical ground. It was just the FEE modules on a different ground.
Photos of connection at end of attachments.

It was found later in the afternoon that the 3mV drop comes as a result of the resistance of the bolt used to connect all the thinner wires to the thicker copper braid.

Very good rates observed in all p+n strips but high rates in n+n.
The large oscillations observed in waveforms yesterday are gone though. High frequency component remains
Statistics - attachment 1
Rates spectra - attachment 2
Zoomed in rates spectra - attachment 3
p+n aida11 1.8.W - attachment 4
n+n aida02 1.8.W - attachmeFEE Width
9   60.25
1   64.18
10  55.76
11  64.81
3   56.21
12  48.54nt 5

We then reconfigured the PSU so that the FEEs for a given detector were all on the same PSU
Rates are observed to drop across all p+n fees

Statistics - attachment 6
Rates spectra - attachment 7
Rates spectra y max 10 - Attachment 8
p+n aida 12 1.8.W - attachment 9
n+n aida 02 1.8.W - attachment 10

Pulser was then connected to all p+n channels but left off
Rates - attachment 11
Rates spectra - attachment 12
Rates spectra ymax10 - attachment 13

Pulser was then switched on

Rates spectra - attachment 14
Statistics - attachment 15
Pulser peaks p+n - attachment 16

Pulser widths
FEE Width
9   60.25
1   64.18
10  55.76
11  64.81
3   56.21
12  48.54

n=n pulser was then added to both 2 and 4
Pulser peaks n+n - attachment 17
Pulser peaks p+n - attachment 18

FEE Width
9   62.88
1   65.30
10  55.18
11  64.47
3   51.77
12  50.22

2   196.00
4   271.57

29 October

Test adding LK2,3,4 to n+n
n+n all LK1,2,3,4
p+n all lk 2,3,4
Makes p+n side worse - attachment 22

Remove LK3 from n+n
n+n 1,2,4
p+n all LK2,3,4
A slight improvement on previous
attachment 23

Remove LK2 and 4 from n+n
Remove LK3 from all p+n except 1 and 3 which are the two non isolated cables
attachment 24