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Assuming the problem is not localized within Hall B, we can also check the bleedthru from other halls. </div>
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suggestion from Joe Grames:</div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">If you close all slits and only run the Hall B beam at 250 MHz is the "cleanest" setup, to the extent B is not bleeding into B'
and scraping into the Hall - I guess it should really be close to zero and the base line. Next, open up only the A slit, to check for B into A, and then open up only the C slit, to check for B through C slit. If no halo yet, then B laser is excluded from
causing themselves grief. After this, you could repeat with only each of the other beams, to identify the source of the electrons causing halo.</span><br>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">He estimates this is a 20 minute thing and he is willing to assist the crew do this in case they need to.</span></div>
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