ELOG CARME

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

CARME

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Thu Sep 17 10:13:43 2020

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The Chamber has continued to pump overnight and we have reached a pressure of 3.3e-6 mbar as of 10:15. Power cable for the hot cathode gauge was found.&nbsp;Gauge did not give a reading so pin connections were checked, all is okay so it may be thepressure is still too high within the chamber, gauge was thus turned off. I have attached the RGA from this morning which has increased accuracy so has been cleared up for most of the noise from yesterday.&nbsp;I have begun removing the covers for the neg-ion pumps, attached is the how it looks without the cover. The covers have strong magnets in them so I will put in a box far away from our electronics.

10:15 &nbsp; &nbsp;3.3e-6 mbar (cart)

11:27&nbsp; &nbsp; 3.2e-6 mbar (cart)

13:26&nbsp; &nbsp; 3.2e-6 mbar (cart)

16:00&nbsp; &nbsp; 3.2e-6 mbar (cart)

I have begun manually reducing the temperature for the bakeout, to observe the rate of cooling across the vessel. I have noticed a bug in the program,&nbsp;the rate of each thermocouple reads as if it is increasing despite the decrease in temperature of the thermocouple. The actual temperatures and averages appear to be working okay.&nbsp;

09:43&nbsp; &nbsp;RE-72 temperatures are 135 deg. Temperature set to 125 deg.

11:01&nbsp; &nbsp;RE-72 temperatures are 125 deg. Chamber temps equillibriating, average chamber temperature 125.5 deg&nbsp;and max difference is ~3 deg. Temperature set to 100 deg.

11:14&nbsp; &nbsp;RE-72 temperatures are 115 deg. Chamber max difference exceeds 10 deg, chamber average is 115 deg. Temperature set to 115 deg will wait to equilllibriate. Recommend not to lower temperature by &gt;10 deg. Top of the chamber cools much slower than the bottom.&nbsp;

13:26&nbsp; &nbsp;RE-72 temperatures are 115 deg. Chamber average is 115.3 deg, chamber max difference is 2.8 deg. Temperature set to 105 deg.

14:20 Previously unobserved bug occured - all temperature display frozen. Rates still OK. Temperature control still OK. Rebooted Baking.x remotely. Back OK. Reduced temperature to 90 C. See attached temperature plot before rebooting.

18:00 Temperature reduced to 80 deg.

21:25 Temperature reduced to 75 deg.

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