[Nexus] NAPI-Release 4.3.0, Nexus Application definitions 3.1
Mark.Koennecke at psi.ch
Thu Feb 7 14:44:29 GMT 2013
I am pleased to announce the release of:
- The NeXus-API 4.3
- And the NeXus Application Definitions 3.1.0
The NeXus-API 4.3 can be downloaded from:
The NeXus Application Definitions from:
The NeXus-API 4.3
This is mainly a bug fix release but we do have a couple of new feautures:
- We now allow 64 bit dimensions when creating and interacting with
This solved a problem for the guys writing lots of event data at SNS
- The NAPI now requires HDF-5 version 1.8 and above. HDF-5 1.6 is
deprecated. The new
version of HDF-5 allowed us to do some things, espcially regarding
much better then they were before.
- Up To NAPI 4.2 only the first dimension of a dataset could be
unlimited. This restriction
has now been lifted for NAPI 4.3 with HDF-5. All dimensions can now
- Included in the release kit is an alpha version of a higher level
python tree API for
NeXus which allows to read a NeXus file with one call.
NeXus Application Definitions 3.1.0
This is the first release of a set of application definitions for
various classes of
instruments. An application definition is a strict standard of required
data fields for
a specific use case of NeXus. The version 3.1 is misleading, it is
really a 1.0 release.
The NIAC has decided to release this now after having waited for
feedback from the community
for much to long on our candidate application definitions. There are
* archived data
* direct geometry TOF spectrometer
* X-ray fluorescence
* indirect geometry TOF
* I(Q) processed data
* TOF laue
* monochromatic powder diffraction
* scanning mode reflectometer
* TOF reflectometer
* Small Angle Scattering including related techniques
* TOF small angle scattering
* Simple scan
* S(Q,OM) processed data
* triple axis spectrometer
* TOF neutron powder diffraction
* TOF raw data for a generic TOF instrument
* tomohraphy raw data
* phase contrast tomography raw data
* processed tomography data
* X-ray absorption spectroscopy
* X-ray absorption spectrosocopy raw data
* Eulerian cradle single crystal diffractometer with or without area
* Kappa single crystal diffractometer with or without area detector
* Normal beam geometry single crystal diffractometer with or without
* Laue diffratometer
* Laue diffractometer with image plate
* PX rotation camera
We hope for lively discussion about these application definitions. As
long as no data
complying to these application definitions has been written the NIAC is
to improve these applicaton definitions in collaboration with the
We are ready to ship an updated 1.1 release of application definitions
as soon as the
first storm of comments is done with.
The application definition release also contains a copy of the new
upgraded NeXus manual.
Much work went this manual in order to make it consistent, readable and
up to date.
Further NeXus News
* The company DECTRIS is going to use NeXus-HDF5 to store data from
their upcoming EIGER
series of detectors. The detector is so fast that the CBF format used
detectors cannot keep up. The programming model will be that the
writes the detector part of the NeXus file and the local DAQ system
adds metadata to
* At a recent EIGER workshop in Baden data aquisition and data analysis
and decided to agree on and implement a couple of NeXus application
the next few months.
* In response to demands from the community, we have documented how to
NeXus compliant HDF files using the HDF APIS alone. This is a very
in the new manual.
* The NeXus WWW-site at http://www.nexusformat.org has been refurbished.
is now automatically generated from the manual. And as the manual is
up to date, so
is the WWW-site.
* The CIF way to describe instrument component positions and
orientations through the
application of transformations has been integrated into NeXus.
* In summer, there will be a meeting between IUCR-CIF representatives
and NIAC members
in order to discuss a closer collaboration/mapping between CIF and
I thank all volunteers for all the good work which went into this release.
on behalf of the NIAC
More information about the NeXus