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 17:13:55 2025
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> > 09.30 CARME chamber status > > Edwards scroll pump ON > Edwards Speedivac valves #1 & #2 OPEN > VAT gate valves OPEN > > Re-connect Leybold Pirani gauge to local display/control > CARME chamber pressure 2.4mbar > > Scroll pump should be able to achieve < 0.1mbar - indicates significant leak > > Davide will first check bolt torques for all flanges opened during most recent vacuum cycle > > 12.05 Additional torque did not resolve problems > ML test COF600 seal with isopropanol and observed increased chamber pressure > > Will open COF600 seal after lunch > > 13.55 COF600 seal removed - one section marked by Kapton tape shows some distortion and a burr on the inner diameter - see attachments 1 & 2. > > > ML speculated that perhaps the seal was lightly too long and a section of circumference was forced outwards? > Vacuum surfaces cleaned with isopropanol and tissues - red/brown discoloration probably indicating copper observed > > 14.30 New COF600 seal installed, flanges closed, bolts finger tight, bolts then systematically torqued in small increments > > COF600 torques finger tight, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160Nm x2 > DN100 flanges doenstream finger tight, 8, 16, 24Nm > > 16.40 Start scroll pump and slowly rough chamber > > 18.00 Roughing CARME chamber pressure flatlines c. 30mbar indicating a large leak. > ML ran some isopropanol around COF600 flange and observed response in roughing pressure of c. 0.2-0.3mbar at c. 30mbar which appears to confirm COF600 is leaking. > > > Encoding: HTML ELCode plain Suppress Email notification

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