Hi Matthew,
At NSLS-II, we use a solution developed here at BNL for quad BPMs and
other current-measurement operations. (I am using it for ion chambers
at my beam line.)
It is a box developed in the Instrumentation Division with a current
amplifier, an A2D converter, and a microprocessor all inside a box
that's about the size of a box of Pop Tarts. It has 4 SMA input
channels and a single gain for all four channels. SMA to BNC cables are
readily available from all the standard vendors. The output is an
ethernet cable. The microprocessor runs a small debian system and
starts an EPICS IOC and a DHCP client on boot. the 4 current get
exposed as 4 PVs and the IOC does a lot of useful statistics on the fly.
Seems to work pretty well.
You could contact Pete Siddons. (Search for Siddons at the BNL website.
When I tried it, the second hit was his staff page.)
B
On 11/14/2017 03:16 PM, Matthew Marcus wrote:
I've gotten involved with a project in which stabilization of the
position of a monochromatic, soft X-ray beam is needed. The
offending frequencies seem to be vibration frequencies like 57 and
116Hz. We have in mind to use a thin Au film with a gap in the
middle, measuring the drain current from the films, much as people
normally use the jaws of slits. Now, I'd like to find a couple
of current amplifiers which are small enough so that they can be
connected with very short cables to the BNC connectors on the
air-side of this detector, and which would have decent frequency
response and low noise with inputs of the order of 0.1-1nA.
Although this topic is outside the realm of XAFS analysis with IFEFFIT,
I figure that people on this group might have some
good experience.
mam
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--
Bruce Ravel ------------------------------------ bra...@bnl.gov
National Institute of Standards and Technology
Synchrotron Science Group at NSLS-II
Building 743, Room 114
Upton NY, 11973
Homepage: http://bruceravel.github.io/home/
Beamline: https://www.bnl.gov/ps/beamlines/beamline.php?r=6-BM
Software: https://github.com/bruceravel
Demeter: http://bruceravel.github.io/demeter/
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