ELOG CARME

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

CARME

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Wed Jun 21 18:47:36 2023

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Internal CARME installations complete.&nbsp;

<ul>
	<li>New strain reliefs (flange side) installed on each cable harness.</li>
	<li>2x sets of SAES UHV1400 NEG pumps installed and connected to 2x power feed-through flanges -&gt; continuity checked OK -&gt; 3x UHV1400 modules gives a resistance of 7.4 Ohms, 2x UHV1400 modules gives resistance of 4.8 Ohms.&nbsp;</li>
	<li>Pins B &amp; D open circuit wrt ground ( DMM OL &gt; 20M ? )</li>
	<li>Pin C connection to ground OK&nbsp;</li>
	<li>Internal thermocouples connected. Middle thermocouple connected to strain reliefs, right thermocouple connected to a standoff on the detector, left thermocouple floating (see attached images). Resistance on thermocouples checked for middle and right thermocouples ~ 4 Ohms per thermocouple.&nbsp;</li>
</ul>

V-I tests performed prior to closing CARME. All detectors show expected curve, but light leaks are present. Pressing my hand against the aluminium shield yielded 0.5-1.5 uA drop in leakage current. Could not turn off lights for the test due to other people working in the cave. Will repeat test when closed. Temperature in the cave ~ 21.5 C.&nbsp;

Both chamber sections have now been closed. Wire seal appeared correctly positioned immediately prior to final close. Bolts closing the wire seal have been tightend to 100 Nm, plan to increase to 140 Nm tomorrow. DN100 feed-through flanges have been tightend with a torque of 24 Nm.&nbsp;

Plan is to move chamber back onto the ring tomorrow and get ready for leak testing.&nbsp;

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