Log entry time 16:14:41 on June23,2004

Entry number 126672

This entry is a followup to: 126621

Followups:

• 127392 06/29/04 16:24 Armstrong note on septum heating (He vs. H)

 Below is a plot of the septum quench tests done June 21. 

  Notes: 
   - 20 cm Helium cell, with density 0.126 gm/cm3 
      (which is 10% lower than the nominal value
        of 0.140gm/cm3 used in the proposal)
   - the data table in halog entry 126621 had the temperatures for
     the 33.5 µA point for the right septum incorrectly entered;
     the plot here has the correct values (transcription error from
     my notes)
   - both septa quench when the maxmimum temp on one of the coil
      temperatures reaches between 7.7 and 7.8 K. 
   - the quench point seems very reproducible: the right arm quenched
     at the same temperature and currents as it did for the test 
     of June 12, and the temp. vs. beam plots agree nicely with the
     initial tests from  halog entry 125364. 
   - if the right septum could be made to behave as well as does
     the left septum then we could have run at just under 55 
     µA.