LER thermal outgassing is back again with us Significant increase in East Diamond signal since May...
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Transcript of LER thermal outgassing is back again with us Significant increase in East Diamond signal since May...
![Page 1: LER thermal outgassing is back again with us Significant increase in East Diamond signal since May 12, ~3 pm due to thermal outgassing in two pumps VP3044,](https://reader030.fdocuments.us/reader030/viewer/2022032703/56649d3a5503460f94a14216/html5/thumbnails/1.jpg)
LER thermal outgassing is back again with us
• Significant increase in East Diamond signal since May 12, ~3 pm due to thermal outgassing in two pumps VP3044, VGCC3027
• Happened one day before the last LER current step (2400 mA on May 13)
• Due to HER current increased from 1.3A to 1.4A• As in March, change associated with pressure
AND sensitivity variations in these pumps• Seen also in DCH and DRC
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One month history of LER and Diamond East
LER
East Diam
April 17
May 18
May 12
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Extra heating due to HER increase (thanks to Witold for pinting this out!)
HER increased from 1.3 to 1.4 A
From 3 pm onwards
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Pressure variations in VP3044 and VGCC3027
VP3044 VGCC3027
VP3075VP3147
![Page 5: LER thermal outgassing is back again with us Significant increase in East Diamond signal since May 12, ~3 pm due to thermal outgassing in two pumps VP3044,](https://reader030.fdocuments.us/reader030/viewer/2022032703/56649d3a5503460f94a14216/html5/thumbnails/5.jpg)
Detailed history of May 12
LER
VP3044
VGCC3027
East Diam
Time in hours
0 12 24
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Detailed history of May 13
LER
VP3044
VGCC3027
East Diamond
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Also affects DCH and DRC(not corrected for HER increase)
DCH DIRC 0
600
1000+20 %
+20%
One month History April 17_May 18 One month History April 17_May 18
![Page 8: LER thermal outgassing is back again with us Significant increase in East Diamond signal since May 12, ~3 pm due to thermal outgassing in two pumps VP3044,](https://reader030.fdocuments.us/reader030/viewer/2022032703/56649d3a5503460f94a14216/html5/thumbnails/8.jpg)
It is also thermal outgassing in DCH and DRC
DCH DRC 0
Time in hours Time in hours
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More evidence that DCJ is outgassing
and NOT neutronsLER/HER/LUMI
DCH
Neutrons
Diam East
May 18
7 pm to 11 pm
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Summary of May 12-13 for DIAM E
All variables normalized to 1 on MAY 18 0 am
Time in hours
DIAME
LER
VP3044
VGCC3027
HER
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Summary for May 12-May 21
DIAMELERVP3044VGCC3027HER
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Summary of May 12-13 for DRC and DCH
All variables normalized to 1 on MAY 18 0 am
Time in hours
LER
VP3044
DRC0
DCH
HER
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Diamond East is perfectly described with two pumps vP3044
and VGCC3027
May 11 6 pm to Midnight
Diam E
VGCC3027
VP3044
14
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After the start of outgassing
May 13, 8 pm to Midnight
14
25
Almost doubling of DIAME
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Still true later on
May 17
3am to Midnight
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The coefficients, normalised to 1 on May 10
VP3044VGCC3027
VP3075 VP3147
Days in May Days in May
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Evolution of pressures and DIAM-E sensitivity coefficients
Sensor Pressure change
Coefficient
change
Total change
VP3044 X 1 X2.5 X2.5
VGCC3027 X3.5 X0.6 X2.1
DiamE x1.65
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Conclusion
• Significant increase (x1.65) of DIAME since May 12 due to thermal outagassing in VP3044 and VGCC3027
• Caused by the HER current increase from 1.3A to 1.4A• Affects also DCH and DRC• Pressure AND sensitivity variation in both pumps
– VP3044 sensitivity x 2.5– VGCC3027 reduced by a factor 2 !– Evidence of VP3044 pressure reduction with time
• Will be interesting to correlate with the many new temperature sensors
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Pressure spike on May 22
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Pressure spike on May 23
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BABAR dead time driver
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East Diamondrecent week