Experimental Physics and
Industrial Control System

Gabriel de Souza Fedel <[email protected]> · Wed, 9 May 2018 16:25:29 -0300

Hi Matt,

On 09-05-2018 09:22, Matt Newville wrote:

Hi Gabriel,

On Wed, May 9, 2018 at 6:56 AM, Gabriel de Souza Fedel

<[email protected] <mailto:[email protected]>> wrote:

    Hi,

    Here at Brazilian Synchrotron (LNLS) we are working to implement
    nexus on some beamlines. We are working with python, getting all
    data from epics PVs and build nexus files. On all the cases the most
    important data are waveforms.

    We would like to analyses other possibilities, and to verify how
    other synchrotrons generate nexus files:

    Do you are working with nexus files?

Yes, many beamline groups at the APS use nexus, especially in the sense

that nexus is HDF5+naming conventions.

great!

    How do you generate them?
    Are you using some high level language for it (like python, c++) ?

 From python, nexpy (https://github.com/nexpy/nexpy) is very useful for

working with nexus data, either from plain python programs, or from its

very nice GUI.  You can also sort of "roll your own" by using HDF5 + the

nexus conventions.  That's probably not "recommended", but it can work

in a pinch.

Hum, nice! I didn't know this library, I will take a look.

    Is it possible to generate nexus files using areadetector for
    instance (with more than one "source", including waveform) ?

Yes, there is a nexus plugin for areadetector.  In addition, the HDF5

plugin follows (as far as I know) the nexus conventions, and can also be

discovered and handled well by nexus tools.

Thank you for the answers

Regards

--Matt Newville

--
Gabriel Fedel
Software de Operação das Linhas de Luz
Laboratório Nacional de Luz Síncrotron – (LNLS)
Centro Nacional de Pesquisa em Energia e Materiais (CNPEM)
[email protected] | +55 (19) 3512 1226
www.lnls.cnpem.br

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System