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 17:18:05 2025
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09.15 Following overnight pumping of CARME chamber by Leybold turbo Pirani 1.00e-3 mbar IE514 2.83e-7 mbar The Leybold IE514 gauge currently in use is the CARME unit ( serial # 1054 ). The calibration data can be found at https://elog.ph.ed.ac.uk/CARME/56 09.44 Pirani 1.00e-3 mbar IE514 2.71e-7 mbar 10.10 Leak tester attached to backing line Valves to leak tester and turbo (connection to Edwards scroll pump in between) closed. Stop Edwards scroll pump with magnetic valve 'red' button - magnetic valves closes and Edwards scroll pump is switched off. Open valves to leak tester and then (slowly) turbo. Wait for leak tester to settle in e-12 mbar.l/s range. Leak tester pressure 3.6e-3 mbar. IE514 2.69e-7 mbar. 11.00 Pirani 1.00e-3 mbar IE514 2.42e-7 mbar Leak tester 1.8e-10 mbar.l/s 13.04 Pirani 1.00e-3 mbar IE514 2.06e-7 mbar Leak testing. Downstream DN100 flanges from CARME to dipole OK Lower NEG power connector feedhtrough (downstream chamber) OK Left hand side (looking downstream) bellows OK c. few e-9 mbar.l/s leak bottom left (lookimg downstream) of COF600 wire seal Additional torque to M16 bolts bottom left - c. 10 bolts -> 220Nm+ c. 0.1-0.3e-11 mbar.l/s Further checks around circumference of COF600 seal reveal some small leaks c. e-11-12 mbar.l/s.? However background rate in leak tester too high for sensitive test - will await recovery to resume checking. 14.00 Pirani 9.8e-4 mbar IE514 1.96e-7 mbar Leak tester 4.9e-10 mbar.l/s 14.35 DSSSD test IE514 OFF Ambient temperature 21.5 deg C Top right -10V -4uA -20V 10uA c. -30V > -20uA trip Top left -150V -5.15uA Bottom left -150V -4.97uA Bottom right -150V -6.33uA Top right (repeat) -20V -10uA -25V -14uA 15.28 IE514 ON Pirani 9.8e-4 mbar IE514 1.87e-7 mbar 15.40 c. few e-9 mbar.l/s leak around magnetic valve - probably not an issue in terms of backing performance but may interfere with/confuse leak testing 16.05 Pirani 9.8e-4 mbar IE514 1.74e-7 mbar Leak tester 1.2e-9 mbar.l/s Will leave CARME pumping with leak tester on roughing line and see whether leak rate recovers. If so, will continue leak tests tomorrow. 18.50 Pirani 1.00e-3 mbar IE514 1.48e-7 mbar Leak tester < 1e-12 mbar.l/s (leak tester valved off) Encoding: HTML ELCode plain Suppress Email notification

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