SCT Forward System Test
Runs With Four Outer Modules On the Sector

4 outer modules on positions O10 through to O13

All modules were trimmed, masked and had RC data according to te data obtained from the individual on sector module characterisation.
In this configuration, three-point gain scans were performed with all 4 modules operating, powered with LV3's via chokes at PP1. At start-up the status was:

Module	Vcc(V)	Icc(mA)	Vdd(V)	Idd(mA)	Vdet(V)	Idet(uA)	Thyb(oC)
302	3.5	980	4.0	610	100.1	0.3	34
402	3.5	590	4.0	590	99.9	0.7	37
400	3.5	970	4.0	610	100.0	0.7	35
303	3.5	990	4.0	590	100.1	0.9	37

The results are as follows:

302:	summary file	three-point gain
402:	summary file	three-point gain
400:	summary file	three-point gain
303:	summary file	three-point gain

The s-curves from the 3pt gain and from the NOvsQ scans are here.
A comparison of the noise from the three-point gain scans with results from the individual tests on the sector shows resonable agreement. The first chip on module k5_303 shows an increase in noise. The comparison of the data from the multi-module run (after 25hours running on the sector) with the modules tested individually on the test sector is given.

No seagulls were seen for the modules on the sector. This is illustrated in the plots below from a threshold scan at 2fC input charge.

K5-302 link 0	K5-302 link 1
K5-402 link 0	K5-402 link 1
K5-400 link 0	K5-400 link 1
K5-303 link 0	K5-303 link 1

A scan of Noise occupancy as a function of threshold, in charge (fC ) was performed after 1 hour of running and 25 hours. A summary slide shows the good aggrement in noise between the 3point gain and the Noise Occupancy runs for both the run performed after 1 hour of running and 25 hours. The first chip of module k5_303 again shows increase noise.
Noise occupancy as a function of time was measured with the threshold set to 1fC on all modules. The duration of a noise occupancy measurement is about 1 minute, with a 2 minute interval been measurements. 100 measurements were made.

Noise Occupancy as a function of time for each chip

Average noise occupancy during run

Peaks in noise occupancy (found using Jorn's macro)

Noise occupancy vers time shows a decrease in noise as observed in the barrel. There are no peaks detected in the noise occupancy as a function of time plots. Had peaks been present (also observed in the barrel due to the pick-up by the system of the switching currents of the air-conditioning) this would be indicative of inadequate shielding. Tests with injected charge into the cooling pipes has just started.
The Correlated noise data taking macro has been run (run 1365, scan 215) for the 4 modules. The latest version of the analysis software from Paul Bell and Jorn was used. The first graph shows that the noise calculated from the correlated noise measurement (red dots) agreed very well with those from the 3pt gain scan (green dots). The amount of correlated noise found was low and consistant with zero.