ELOG CARME

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

CARME

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Entry time:	Fri Apr 4 17:16:47 2025
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> 2x cooling water manifolds with 2x 8 ports have been installed - see attachments 1 & 2 > > 'drain' ports at top of manifold to permit release of trapped air volumes. Local technicians will install a standard blank in one manifold and a small nipple valve on the > other so that we can bleed air in a controlled way. > > #Multimeter detector pin tests. > Pins on feedthrough flanges investigated using multimeter for the top and bottom detector due to no response from bottom detector when bias was applied. Bias pins on > correct D connectors are number 78. > > #Top detector > >Observe -18.5 kohm; between nn bias pin and pn bias pin (multimeter 200kohm setting) > >observe open line between nn bias pin and pins 'near' pn bias pin (multimeter 200kohm setting) > > >Between random pins on same D connector (nn bias pin connector) ~0.02Mohm (multimeter 2Mohm setting) > >Between random pins and unconnected on same D connector (nn bias pin connector) - open line (multimeter 2Mohm setting) > >Between random pins and bias pin on same D connector (nn bias pin connector) ~0.01-0.02 Mohm (multimeter 2Mohm setting) > > >Between nn bias pin and random pin on another D connector ~-0.4Mohm (multimeter 2Mohm setting) > > #Bottom detector > >Observe open line between nn bias pin and pn bias pin (multimeter 200kohm+2Mohm; setting) > >Observe open line between nn bias pin and pins 'near' bias bias pin (multimeter 200kohm+2Mohm; setting) > > >Between random pins on same D connector (nn bias pin connector) ~0.02Mohm (multimeter 2Mohm setting) > >Between random pins and unconnected on same D connector (nn bias pin connector) - open line (multimeter 2Mohm setting) > >Between random pins and bias pin on same D connector (nn bias pin connector) ~0.01-0.02 Mohm (multimeter 2Mohm setting) > > >Between random pins on same D connector (pn bias pin connector) ~0.02Mohm (multimeter 2Mohm setting) > >Between random pins and unconnected on same D connector (pn bias pin connector) - open line (multimeter 2Mohm setting) > >Between random pins and bias pin on same D connector (pn bias pin connector) ~open line (multimeter 2Mohm setting) > > >Between nn bias pin and random pin on another D connector ~-0.4Mohm (multimeter 2Mohm setting) > > We see a similar response for both detectors except that the pn bias pin gives no response. > We have looked to find the bias pin on nearby pins to pin 78 and on the other side of the D connector (in case of cabling error-mirror or swapped cables) but cannot find. > > 4 FEE holders constructed and ready to install Encoding: HTML ELCode plain Suppress Email notification

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