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, 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

2. One month history of LER and Diamond East LER East Diam April 17 May 18 May 12

3. 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

4. Pressure variations in VP3044 and VGCC3027 VP3044VGCC3027 VP3075 VP3147

5. Detailed history of May 12 LER VP3044 VGCC3027 East Diam Time in hours 0 12 24

6. Detailed history of May 13 LER VP3044 VGCC3027 East Diamond

7. Also affects DCH and DRC (not corrected for HER increase) DCH DIRC 0 600 1000 +20 % One month History April 17_May 18

8. It is also thermal outgassing in DCH and DRC DCH DRC 0 Time in hours

9. More evidence that DCJ is outgassing and NOT neutrons LER/HER/ LUMI DCH Neutrons Diam East May 18 7 pm to 11 pm

10. 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

11. Summary for May 12-May 21 DIAME LER VP3044 VGCC3027 HER

12. 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

13. Diamond East is perfectly described with two pumps vP3044 and VGCC3027 May 11 6 pm to Midnight Diam E VGCC3027 VP3044 14

14. After the start of outgassing May 13, 8 pm to Midnight 14 25 Almost doubling of DIAME

15. Still true later on May 17 3am to Midnight

16. The coefficients, normalised to 1 on May 10 VP3044 VGCC3027 VP3075 VP3147 Days in May

17. Evolution of pressures and DIAM- E sensitivity coefficients SensorPressure change Coefficient change Total change VP3044X 1X2.5 VGCC3027X3.5X0.6X2.1 DiamEx1.65

18. 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

19. Pressure spike on May 22

21. Pressure spike on May 23

24. BABAR dead time driver

25. East Diamond recent week