Beam6b dropout oct11


The problem:

    a2010 reported that alfa beam6b had low power on 02oct11. This was seen in wapp beam6b and beam7b (which is a copy of beam 6b). A2611 (zoa) ran after a2010 and used the mock spectrometer. The power levels were also erratic for bm 6b .. so the problem is  not with the wapp or mock spectrometers.

    the plots show the variation of the total power in the 1450 alfa band (172 mhz) during the a2611 observation on 03oct11 (.ps) (.pdf)
    Ganesh,dana,denis,  et al say that the problem is probably in the amplifier.

processing: x101/111002/