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User name jroche
Log entry time 09:12:37 on November22,2004
Entry number 137335
This entry is a followup to: 137178
keyword=hall A hall C beam correlations
The PD lets me know that the correlation observed by Alex Saturday originates at the photo-cathode. Alex noticed that the hall A beam intensity would decrease when hall C started to receive beam. This happen because the efficiency of the cathode decreases as a function of the power dissipated.
The way to solve (reduce) the effect would be to move the spot on the cathode. Because we are so close from a down and the correlation is not a big deal for us after all, the spot move is postponed.