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<== Date ==> <== Thread ==>

Subject: Re: rapid scans
From: Tim Mooney <[email protected]>
To: [email protected]
Cc: [email protected]
Date: Fri, 12 Mar 2004 14:07:51 -0600
Bill Lavender wrote:
On Fri, Mar 12, 2004 at 10:25:26AM +0100, D. Peter Siddons wrote:

What aproaches are people taking to performing on-the-fly scans? What I mean is, a scan in which one launches a motor move and reads a detector as the motor is moving, rather than the more typical step-scan.
Pete.


If you are using a multichannel scaler to record your detector counts,
you just need to generate some signal that depends on the motor position
that your multichannel scaler can record.

...
Under EPICS, I have used the Struck SIS3801 multichannel scaler with
good results using the EPICS MCA record.  The only problem with it has
been that it is limited to a maximum of 4000 points by the version of
the MCA record that I have.  If there is a newer version of the MCA
record that no longer has this restriction, then I would be interested
in hearing about it.

Bill Lavender
Illinois Institute of Technology
[email protected]
+1-510-612-4747

Under EPICS 3.14, I've acquired up to 64000 points with the setup you're describing. The actual limit should be much higher than this -- something hilarious, like 2 billion -- but I haven't gotten more than 64000 out to a CA client. There may be some unsigned short integers hanging around where they're no longer wanted.

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab


References:
rapid scans D. Peter Siddons
Re: rapid scans Bill Lavender

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