ELOG AIDA

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

AIDA

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Entry time:

Tue Feb 9 17:27:12 2016

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08/02/16
Spoke to PJC-S -&gt; Ethernet cables from FEEs to switch are all 4m Cat6.
System powered on with bias to detector of +200V and leakage current of 6.4uA at room temp 19.0oC.
Double peaking present again in nnaida11/12 -&gt; individual peaks @ ~100ch FWHM with separation ~150ch @ 2us shaping time.
Double peaking also present in nnaida13/14 -&gt; indiv peaks ~100ch FWHM and separation ~90ch.
Changing grounding had no effect.
Made ribbon cable with 2 separately shielded halves plus connecting Cu tape strip at FEE and + drain wire in contact with both halves - single peaks - widths of ~110-160ch.
&nbsp;
09/02/16
Added conductive gasket to Cu mount blocks
&nbsp; &nbsp; &nbsp; - resistance between Cu and gasket ~0.2 Ohms (probe-to-probe = 0.16 Ohms)
&nbsp; &nbsp; &nbsp; - LEMO connector to Cu mount block ~0.35 Ohms
&nbsp; &nbsp; &nbsp; - LEMO to LEMO (between adapter PCBs) ~0.55 Ohms (connected by heavy duty Cu braid)
Powered system on. Bias of +200V and leakage current = 5.5uA @ room temp 19.5oC.
With gasket added and heavy duty Cu braid between mount blocks, pulser FWHM in nnaida11 ~ 62ch and in nnaida13 ~72ch at shaping time of 8us.
Investigated effect of shaping time on peak FWHM (avg width found from average of 1.(6,8,10,12).L for each FEE. &nbsp; &nbsp; (see attachments)
&nbsp; &nbsp; Shaping time (us) &nbsp; &nbsp;| &nbsp; &nbsp; nnaida11 &nbsp; &nbsp;| &nbsp; &nbsp; nnaida12 &nbsp; &nbsp;| &nbsp; &nbsp; nnaida13 &nbsp; &nbsp; | &nbsp; &nbsp; nnaida14 &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.5 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;95* &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 108* &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;126* &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;99*
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1.0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;82 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 116** &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;130^ &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; 110** &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2.0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 68 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;83^ &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 110^ &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 92^
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4.0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 60 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;77 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 85' &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 90
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 8.0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;56 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 63 &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;77 &nbsp; &nbsp; &nbsp; &nbsp;| &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;64
&nbsp; &nbsp; &nbsp;* = all peaks single and Gaussian looking
&nbsp; &nbsp; &nbsp;** = not all peaks Gaussian, some flat or sloped top&nbsp;
&nbsp; &nbsp; &nbsp;^ = double peaks, widths estimated from tallest peak
&nbsp; &nbsp; &nbsp;' = flat topped

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