[Tpe] Low current BCM's vs Faraday Cup

[Bennett, Robert P.]

Here is a reply from Stepan concerning BCM calibrations.   I asked if the FC and BCM's could be calibrated against eachother during the low current electron runs during HD-ICE.


________________________________________
From: Stepan Stepanyan [stepanya at jlab.org]
Sent: Monday, February 27, 2012 10:26 AM
To: Bennett, Robert P.
Cc: Arne Freyberger
Subject: Re: FW: [Tpe] Fwd: Fwd: Re: Fwd: bcms

Robert,

 From few days of running with HDIce at beam currents from few hundreds
pA to a nA, I can tell you that BPM currents and FC current are within 10%
of each other. This 10% I thinnk is the level of calibration one can do
at this
low currents. You 50% cross section difference must be from something else.

Stepan