ELOG CIRCE

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

CIRCE

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Entry time:	Fri Mar 28 20:46:33 2025
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>This morning we moved the electronics rack to within ~2.5m of the target chamber, leaving room for the ribbons cables of ~5m length which connect the preamps to the amplifiers in the rack.</p> <p>Then I continued in attempts to solve the iris arm problem, see eLog entry #3.</p> <p>When comparing to the CAD drawing (entry #4) David pointed out the iris was mounted the wrong way around, and that it should be rotated 180 degrees. I attempted this yesterday but decided to investigate more thoroughly.</p> <p>I made three changes in total:</p> <p>1. I replaced the lemo cable on the Si diode with a shorter one (~7.5mm) from Edinburgh, reducing the chance to catch the lemo between the lid and chamber wall</p> <p>2. I moved the diode mount away from the upstream chamber wall to be certain there was no collision here</p> <p>3. I removed the nylon screws intended to connect the S2 to the nylon standoffs on the iris</p> <p>After each change I reattempted mounting the central lid with the iris attached, after the third correction it fit! This suggested the nylon screws were slightly too long.</p> <p>I measured the thickness of the S2 detector serial no 2323-18:</p> <p>PCB board thickness = 2mm</p> <p>Yamatchi connector thickness = 8mm</p> <p>Bond wire solder thickness on back of S2 ~1mm</p> <p> </p> <p>The thread of one nylon screw was cut from 6mm to 4.5mm, after screwing this back onto the iris standoff I found the lid still fit onto the chamber. There will be enough thread to still mount the S2's.</p> <p>At ~13:20 we then went to lunch</p> <p> </p></td> </tr> </tbody> </table> </p><p> </p> Encoding: HTML ELCode plain Suppress Email notification

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