Fußball, Euroball und andere Polyeder

Im Rahmen des Euroball-Projektes (41r-Hochpräzisions-y-Spektrometer) wurden inder ZAT 1 Untersuchungen durchgeführt, eine Kugeloberfläche möglichst gleichmäßig mitFlächen zu belegen . Einen solchen Körper nennt man Polyeder (Vielflächner).Für den Euroball muß das Polyeder folgende Forderungen erfüllen:• an jeder Ecke des Polyeders treffen drei Polygone (Vielecke) zusammen• die Anzahl verschiedenartiger Polygone soll möglichst klein sein• die Polygone sind kongruent (deckungsgleich)• die Polygonfläche soll möglichst wenig von der Fläche des umschreibendenKreises abweichenDiese Forderungen werden am besten von einem Polyedertyp erfüllt:das Polyeder mit I2 Pentagons und x-Hexagon

µTCA Management – Aktuelle Entwicklungen im ZEL

ATCA und TCA, IPMI, IPMI-Testsoftware, MMC und coreIPM, Entwicklungsarbeite

MicroTCA at the Multiplexing Level in the Readout of the PANDA Micro Vertex Detector

The experiment PANDA (Antiproton Annihilation at Darmstadt) is under development for the future acceleratorfacility FAIR in Darmstadt, Germany. In the target spectrometer of PANDA a micro-vertex detector (MVD) will beused as the central tracking detector for charged particles. The design of the MVD is based on silicon strip detectors atthe outer layer and on silicon pixel detectors at the inner layers. Data from the readout ASICs in the front end are sentvia GBT opical link (CERN development) to a Multiplexing Layer, where 3 GBT links are aggregated to 1 10 Gbit/soptical link to the Level-1 Trigger network. The Multiplexing Layer will be implemented with MTCA.4. The so-calledHGF-AMC, a versatile AMC module developed by DESY in cooperation with KIT, will be used for the aggregation ofthe GBT links. The HGF-AMC is based on a Kintex-7 FPGA and supports MTCA.4. The paper presents the overallarchitecture and the ongoing developments

Design of an Optical Uplink with 10 GBit/s between PCIe and MicroTCA

In the context of developments for the PANDA detector system an optical uplink from MicroTCA to PCIe is under development. The uplink is based on X2 transceivers with a nominal speed of 10 GBit/s. The PCIe board has already been produced and it is currently under test. It is based on a Xilinx Virtex 5 (XC5VLX30T) FPGA. For the implementation of the XAUI interface to the X2 transceiver a PM8358 SERDES with a parallel interface to the FPGA is used. The corresponding AMC module is based on the same components. Open issues regarding the FPGA implementation of the link protocol will be discussed

Development of an AMC Module MMC

THE MMC (Module Management Controller) of an AMC (Advanced Mezzanine Card) communicates with the Carrier IPMC (Intelligent Platform Management Controller) and the ShMC (Shelf Management Controller) of an ATCA crate (Advanced Telecomunications Computing Architecture). The MMC handles the hardware of the AMC and communicates to the Carrier IPMC by the managemend bus (IPMB). The MMC handles registration in and out to the shelf-management, inventory, payload, status indications and optional internal measurements like temperature, voltage and current. The AMCs fit into ATCA blades (carrier card) or into µTCA crates

The HERMES reflectometer at the JULIC Neutron Platform

HERMES is a time-of-flight reflectometer that operated at the Orphée reactor until 2019. In 2022, HERMES was installed at the JULIC (Jülich Light Ion Cyclotron) Neutron Platform as part of a collaboration between the Laboratoire Léon Brillouin and the Jülich Centre for Neutron Science. The main goal of the current setup is to probe the viability of neutron instrumentation at a High Current Compact Accelerator-driven Neutron Source (HiCANS). As the flux at the JULIC neutron platform is several orders of magnitude lower than the original Orphée flux or the expected flux for a HiCANS, our current objective is to perform reflectivity experiments with supermirrors as a proof of concept. Nevertheless, Monte-Carlo simulations showed that the HERMES instrument’s performance at a HiCANS such as HBS or ICONE could match that of reflectometry instruments operating at research reactors or spallation sources. An experiment with a supermirror carried out in December 2022 allowed us to preliminary prove the feasibility of this kind of experiments at an accelerator-driven neutron source

Development of neutron reflectometry at a HiCANS: the HERMES instrument at the JULIC Neutron Platform

High current Compact Accelerator-driven Neutron Sources (HiCANS) have risen as a possible answer to the drop in neutron availability in recent years due to the closure of various research reactors in Europe. Within this new trend, the Laboratoire Léon Brillouin (LLB) is currently evaluating the performance of neutron techniques around this novel type of source. HERMES [1] is a time-of-flight horizontal reflectometer that was operated by the LLB at the Orphée reactor [2] until 2019 and was mainly employed for soft-matter studies. Through a collaboration with the Jülich Centre for Neutron Science, HERMES was installed in 2022 at the JULIC neutron platform at Forschungszentrum Jülich. This platform is able to deliver neutron pulses in the 100 μs-2 ms range and is very well suited to evaluate the feasibility of reflectivity experiments at a HiCANS. Since its installation and first tests in 2022, several improvements have been planned and implemented at HERMES in order to exploit its maximum performance. Our current goal is to perform reflectivity experiments with supermirrors as a proof of concept, as the flux at the JULIC neutron platform is several orders of magnitude lower than the original Orphée flux or the one expected for a HiCANS. Nevertheless, Monte-Carlo simulations showed that an instrument as HERMES operating at a HiCANS could match the performance of similar instruments at medium power research reactors. This work is part of the collaboration within ELENA and LENS on the development of HiCANS. It has been funded by the "CANS Inflexion" program at the CEA and the "IPHI-Neutron" SESAME project of the Île de France region.[1] F. Cousin, F. Ott, F. Gibert, A. Menelle, Eur. Phys. J. Plus 126, 109 (2011)[2] B. Farnoux, D. Cribier, Phys. B+C 120, 31-36 (1983

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