9 research outputs found
A communication protocol for motion control applications at the JCNS neutron instruments
Application of PROFINET IO in Neutron Scattering Instruments
The control systems of all neutron scattering instruments implemented by the
J\"ulich Centre for Neutron Science (JCNS) are based on Siemens PLC technology.
Historically PROFIBUS has been used for the communication of PLCs with
supervisory computers, decentral periphery systems and other PLCs. Today,
PROFINET IO is the most commonly used industrial real time Ethernet system and
naturally supported by Siemens PLC systems. As a consequence, all new neutron
instruments of JCNS are based on PROFINET IO. For the interfacing to
supervisory computers based on CompactPCI, a CompactPCI carrier board for
PC/104-Plus mezzanines has been developed, allowing the transparent use of the
Siemens PC/104-Plus PROFINET IO controller CP1604 in CompactPCI systems. Linux
is used as the operating system for supervisory computers and the software
development employs the PROFINET IO-Base-API, commonly supported by Siemens
PROFINET IO controllers. On top of this API, an application protocol for the
communication with PLC-based motion systems has been implemented
The Control and Data Acquisition System of the Neutron Instrument BIODIFF
The Neutron instrument BIODIFF is a single crystal diffractometer for biological macromolecules that has been built in a cooperation of Forschungszentrum Jülich and the Technical University of Munich. It is located at the research reactor FRM-II in Garching, Germany, and is in its commissioning phase, now. The control and data acquisition system of BIODIFF is based on the so-called "Jülich-Munich Standard", a set of standards and technologies commonly accepted at the FRM-II, which is based on the TACO control system developed by the ESRF. In future, it is intended to introduce TANGO at the FRM-II. The Image Plate detector system of BIODIFF is already equipped with a TANGO subsystem that was integrated into the overall TACO instrument control system
First test of detectors at theinstrument BIODIFF
The BioDiff instrument at the FRM II has seenthe installation of its two detectors. A neutronscintillator with CCD-camera detector serves asauxiliary detector to perform crystal alignmentand fast measurements with smaller solid anglecoverage. The main detector, a neutron imageplate with online read-out covers a somewhatlarger solid angle of ca. 2π. Whereas the imageplate detector could not yet be tested withneutrons so far first neutron measurementsconducted with the CCD-detector have beenperformed and will be presented here. Theinstrument is intended for neutron proteincrystallography and is a collaboration betweenthe Forschungszentrum Jülich (FZJ) and theForschungs-NeutronenquelleHeinz Maier-Leibnitz (FRM II)
THE NEW TANGO-BASED CONTROL AND DATA ACQUISITION SYSTEM OF THE NEUTRON SPECTROMETER DNS AT FRM II
Towards wide-angle neutron polarization analysis with a 3He spin filter for TOPAS and NEAT: Testing magic PASTIS on V20 at HZB
An XYZ polarization analysis solution has been developed for the new thermal time of amp; 64258;ight spectrometer TOPAS [1], to be operated in the coming east neutron guide hall at the MLZ. This prototype is currently being prepared to use on NEAT at HZB [2]. Polarization Analysis Studies on a Thermal Inelastic Spectrometer, commonly called PASTIS [3], is based on polarized 3He neutron spin amp; 64257;lters and an XYZ amp; 64257;eld con amp; 64257;guration for the sample environment and a polarization preserving neutron guide amp; 64257;eld. The complete system was designed to provide adiabatic transport of the neutron polarization to the sample position on TOPAS while maintaining the homogeneity of the XYZ amp; 64257;eld. This complete system has now been tested on the polarized time of amp; 64258;ight ESS test beam line V20 at HZB [4]. We present results of this test and the next steps forwar
The high-intensity reflectometer of the Jülich Centre for Neutron Science : MARIA
MARIA (magnetism reflectometer with high incident angle) is a world class vertical sample reflectometer dedicated to the investigation of thin films in the fields of magnetism, soft matter and biology. The elliptical vertically focusing guide allows one to measure small samples with a typical size of 1 × 1 cm very efficiently. The double-bounce polarizer and the in situ pumped 3He SEOP (spin-exchange optical pumping) neutron spin filter cell for analysing the polarization of the reflected neutron beam can be moved into the beam in seconds. The polarized flux of MARIA amounts to 5 × 107 n (s cm2)−1 at the sample position with a horizontally collimated beam of 3 mrad, a wavelength of λ = 4.5 Å and a wavelength resolution of Δλ/λ = 10%. In the non-polarized mode a flux of 1.2 × 108 n (s cm2)−1 is achieved in this configuration. MARIA is also capable of grazing-incidence small-angle neutron scattering measurements, using a pinhole collimation with two four-segment slits and an absorber that prevents the focusing of the elliptical guide in the vertical direction