Per. HALOG #383470:
RF-absorbant foam was added inside the BPM-b chassis. Simultaneous RF signals were injected into a and b receivers, and statistics collected (Fig. 1). -106 dBm is the nominal expected signal for an M15-style BPM for 50 nA of beam current (Figure 2).
Receivers are performing identically in this configuration. When BPM sensor was re-connected, slightly different noise statistics were observed, but they do not affect the 50 nA resolution (~ 150 um).
J. Musson x7441
Figure 1
BPM_Test.pdf