User name R. Michaels
Log entry time 09:38:55 on August 2,2005
Entry number 150425
keyword=cavity monitor updateUpdate on the new cavity monitors from a recent production run 4034.
They have recovered from their flatlining (halog 150194).
Fig1 shows the cavity BCM vs bcm1. cavity 2 & 3 are single
valued, but cavity 1 has some "parallel drops" away from the line (?!)
Fig 2 shows a illustrative set of correlations of cavities 2 & 3
(those near target) to the striplines. First comment is that
even comparing 4AX to 4BX (stripline to stripline) is not trivial
since there are presumably strong beta functions. Considering also
the previously observed X-Y "coupling" (halog 150310), the
"cloudiness" of the correlation is perhaps NOT a bad thing.
However I am still bothered by the nonlinearity in halog 150310.
There is no evidence of strong linearity in this recent run I
checked, however (though the range of motion was small).
To summarize where we are:
1. We're not finished with the gain adjustments as we
are not making good use of the ADC dynamic range.
2. I don't think Musson finished the phase adjustments for X (some
problems last Friday).
3. The cavity signals "died" on the weekend and then recovered
mysteriously. We need to know why and what to do about it in
the future.
4. There is evidence of nonlinearity in cavity 2X, see halog 150310.
5. Understand better the correlation to striplines.
FIGURE 1
FIGURE 2
