AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CARME
Draft saved at 00:00:00
Fields marked with
*
are required
Entry time:
Fri Apr 4 02:45:27 2025
Author
*
:
Subject
*
:
<p>9:30</p> <p>Ion pumps de-gassed by switching on and off multiple times. Large pressure increase the first time pumps were flashed, pressure recovers quickly once pumps off. Subsequent flashing of ion pumps showed a significantly smaller pressure increase, unitl little increase was seen. </p> <p>see http://web-docs.gsi.de/~lestinsk/vacplot.php</p> <p>Pressure ~3E-8 mbar</p> <p>10:00</p> <p>Top NEG controller activated. This controller controls 6 NEG wafers connected in groups of two. NEG wafers connected in two's have the following settings which were utilised in Daresbury</p> <p>Ramp Time = 45 minutes</p> <p>Hold Time = 60 minutes</p> <p>Vmax = 100 V</p> <p>Imax = 5A</p> <p>Pmax = 400W</p> <p><strong>(See attachment 4)</strong></p> <p>Settings for the NEG wafers connected in a group of three (white tape on cable) in the moving detector chamber are the same as above but with Pmax = 600W. <strong>(See attachment 3)</strong></p> <p>Settings for the D2000's (kapton tape on cables) are the same used in Daresbury and are;</p> <p>Ramp Time = 45 minutes</p> <p>Hold Time = 60 minutes</p> <p>Vmax = 65 V</p> <p>Imax = 3A</p> <p>Pmax = 254W</p> <p>Tmax = 500 C</p> <p><strong>(See attachment 1 and 2)</strong></p> <p>11:44 </p> <p>Activation of first set of NEG's completed. The temperature of internal thermocouples went above 150C during activation so power to NEG elements was reduced during activation to 125W per module. NEG's fully OFF to allow internal temperatures to cool. Modules will be activated alone to try and find way of activating NEG's without high temperatures. </p> <p>Current bakeout temperature is 95C</p> <p>Pressure ~ 8E-9 mbar</p> <p>13:10</p> <p>All NEG's off. Bakeout Temperature is 95C, internal temperature are ~102C.</p> <p>Pressure = 5.8E-10 mbar</p> <p>Activating a single D2000 NEG pump as they contain in built thermocouples to gauge the effect on internal temperatures. </p> <p>14:53</p> <p>Activation complete for single D2000 up to 500C. Most internal thermocouples remained <110C during activation with one going up to 140C. Temperature of internal thermocouples largely unaffected by the NEG activation untill above 400C NEG temperature. D2000 element will be maintained at 250C for activation of other elements. </p> <p>Internal temperatures fallen back to ~102C</p> <p>Pressure <4E-10 mbar</p> <p>Would recommend activating elements one at a time with a 20-30 minute ramp and limiting power for NEG modules to ~100W per module. </p>
Encoding
:
HTML
ELCode
plain
Suppress Email notification
Attachment 1:
Drop attachments here...
Draft saved at 00:00:00
ELOG V3.1.4-unknown