Messung des totalen Wirkungsquerschnitts für die Photoproduktion von Omegamesonen am Proton

Die Photoproduktion von Omegamesonen am Proton (γp->ωp) direkt an der Produktionsschwelle wurde im Rahmen der ersten Phase des CB-ELSA Experiments in Bonn untersucht. Bei Experimenten direkt an der Schwelle werden die Protonen aus kinematischen Gründen stark in Vorwärtsrichtung fokussiert. Aus diesem Grund kommt dem Vorwärtsdetektor, einem großflächigem Flugzeitspektrometer, eine besondere Bedeutung zu. Daher werden in dieser Arbeit detailliert die Rekonstruktion und die Messmöglichkeiten dieses Spektrometers dargestellt. Im Anschluss folgt dann die Extraktion des totalen Wirkungsquerschnitts der Reaktion γp->ωp im Zerfallskanal mit ω->π0π+π- direkt an der Produktionsschwelle in bisher nicht dagewesener Genauigkeit.The photoproduction of omega mesons on the proton (γp->ωp) directly at the production threshold was investigated during the first phase of the CB-ELSA experiment in Bonn. In experiments directly at the threshold the protons will be strongly focussed in forward direction due to kinematic reasons. Therefore the forward detector, a large area time of flight detector, plays a prominent role and there will be a detailed description of the reconstruction and measuring capabilities of this spectrometer. Thereafter follows the extraction of the total cross section of the reaction γp->ωp in the decay channel with ω->π0π+π- directly at the production threshold with previously unequaled accuracy

ERNST: Demonstrating Advanced Infrared Detection from a 12U CubeSat

The ERNST mission will demonstrate complex infrared detection capabilities using a 12U CubeSat platform. ERNST’s main payload is an advanced cryogenically-cooled infrared imager that implicates demanding requirements in terms of power demand, heat dissipation, and vibration response for a nanosatellite. The optical bench that integrates optics, a filter-wheel for switching between spectral bands, and the detector-cooler system has been additively designed and manufactured, giving it a bionic appearance and combined with a highly efficient radiator. An onboard radiation monitor and a COTS camera complete the mission payloads. The ERNST 12U platform is based on high-performance CubeSat subsystems for avionics, UHF, and X-band communication, attitude control, and power management. The commercial components are made compatible through a backplane solution. In-house developments include a fast DPU and an autonomous de-orbit dragsail. The platform provides 30 Watt (OAP) and \u3e6U payload volume. After comprehensive environmental and functional testing of the Engineering Model, the Flight Model is currently being integrated. Starting operations in February 2023, ERNST will verify early warning concepts and technology

Single Event Effekte, eine Bedrohung im Weltraum und auf der Erde: Dr. Stefan Höffgen, Wissenschaftler Geschäftsfeld Nukleare Effekte in Elektronik und Optik, Fraunhofer INT

Unser Sonnensystem wird permanent von hochenergetischen Strahlen aus den Tiefen des Weltraums bombardiert. Diese kosmische Strahlung besteht aus hochionisierten Teilchen, welche in einem Bauteil derart viel Ladung erzeugen können, dass ein einziges dieser Teilchen ausreicht, um einen spürbaren Effekt in elektronischen Bauteilen auszulösen. Diese Effekte können im Ändern des Inhalts einer Speicherzelle bestehen, einem Upset (SEU). Sie können aber auch zur Zerstörung des Bauteils führen, wie dies bei einem Latchup (SEL), Burnout (SEB) oder Gate Rupture (SEGR) der Fall ist. Diese Effekte zu verstehen und die Elektronik dagegen zu härten ist von lebenswichtiger Bedeutung für jede Weltraummission

Radiation tests on optical materials: Presentation held at Radiation Test Workshop 2016, Seville, Spain, 31st March - 1st April 2016

The talk will give a general introduction on testing optical materials for use in radiation environments. A special emphasis is given to thin optical coatings, optical fibers, and fiber Bragg gratings. Here the test procedures are much more challenging than for bulk materials. The challenges are, amongst others, conflicting standards, often online tests and the necessity to use several different radiation sources. The talk will give an overview of test standards, especially concerning optical fibers, and a discussion of the influence of parameters such as dose rate, temperature etc

Future radiation testing: Adapt or fail: Paper presented at 69th International Astronautical Congress, Bremen, Germany, October 1-5, 2018

Radiation testing of active electronic and active as well as passive photonic devices is a major challenge for nearly all space applications. Methods were developed and standards defined, leading to an accepted way to qualify components for a reliable operation under space radiation conditions. However, many new aspects with respect to space radiation appeared that can potentially overturn decades of “best practice” and existing standard procedures. We may need to define radically new approaches, because in several cases traditional testing methods might or will fail or will not be applicable. Three major radiation effect types in electronic and photonic devices exist: total ionizing dose damage, displacement or non-ionizing dose damage, and effects induced by single particles hitting a sensitive volume

Fraunhofer satellite radiation sensing systems: Paper presented at 69th International Astronautical Congress, Bremen, Germany, October 1-5, 2018

Fraunhofer INT develops systems for on-board radiation sensing. On-board in this context means inside electronic boxes on printed circuit boards (PCB) in close proximity to radiation sensitive electronic devices. The ability to measure dose and/or particle fluxes on the PCB is particularly of interest as this is where radiation hurts the most. In case of intense solar particle events the sudden increase of the measured particle fluxes could be used as an input for adaptive radiation mitigation techniques to protect important electronic parts and systems. Furthermore it can help to reduce radiation design margins for future missions because you get a better knowledge of the received dose inside your electronic box in a given radiation environment. In addition in the case of in-orbit verification or validation missions it is of major importance to verify the reliability of your design against the actual dose received. Our approach is to add as little devices as possible and make use of already installed hardware e.g. microprocessors to operate them, so the output of those sensor devices should already be digital. We propose to integrate additional memory devices for radiation sensing on the PCB: non-volatile UV-EPROMs to measure dose and/or SRAMs to detect high energy (solar) particles. The radiation-induced change of their digital content is a measure for the radiation exposure after calibration in a known radiation field. Fraunhofer On-board Radiation Sensors are already accepted to fly on the German geostationary Heinrich Hertz communication satellite as part of the Fraunhofer On-Board Processor and is foreseen to be implemented on-board of a NanoSat

Fraunhofer satellite radiation sensing systems

Fraunhofer INT develops systems for on-board radiation sensing. On-board in this context means inside electronic boxes on printed circuit boards (PCB) in close proximity to radiation sensitive electronic devices. The ability to measure dose and/or particle fluxes on the PCB is particularly of interest as this is where radiation hurts the most. In case of intense solar particle events the sudden increase of the measured particle fluxes could be used as an input for adaptive radiation mitigation techniques to protect important electronic parts and systems. Furthermore it can help to reduce radiation design margins for future missions because you get a better knowledge of the received dose inside your electronic box in a given radiation environment. In addition in the case of in-orbit verification or validation missions it is of major importance to verify the reliability of your design against the actual dose received. Our approach is to add as little devices as possible and make use of already installed hardware e.g. microprocessors to operate them, so the output of those sensor devices should already be digital. We propose to integrate additional memory devices for radiation sensing on the PCB: non-volatile UV-EPROMs to measure dose and/or SRAMs to detect high energy (solar) particles. The radiation-induced change of their digital content is a measure for the radiation exposure after calibration in a known radiation field. Fraunhofer On-board Radiation Sensors are already accepted to fly on the German geostationary Heinrich Hertz communication satellite as part of the Fraunhofer On-Board Processor and is foreseen to be implemented on-board of a NanoSat

Proton dosimetry at the accelerator COSY for radiation effect testing: Poster presented at European Conference on RADiation Effects on Components and Systems, RADECS 2017, Geneva, Switzerland, 02 - 06 October 2017

Radiochromic films are a useful tool for investigating the beam profile of particle beams for radiation effect testing. The films have to be calibrated for each type of radiation and its energy, for which we use ionization chambers. Additionally, we performed further experiments at various proton energies where we compare different dosimetry systems: an ESA SEU monitor, a calorimeter, and activation analysis. We achieve reproducibility for the calibrated energy range. Transferability to other proton energies than the calibration energy is not successful, instead calibration at the corresponding energy is suggested

Characterization of novel lightweight radiation shielding materials for space applications

Novel materials or multilayers can help to reduce the mass requirement for radiation shielding of electronic components significantly. In this study, potential alternatives to the standard aluminum shielding approach are assessed by Monte Carlo simulations and promising candidates are manufactured and characterized by radiation tests including proton and electron tests. The transmission of energetic protons of up to 39 MeV through the shielding solution was assessed as well as the dose deposited by energetic electrons up to 12 MeV in RADFETs and Alanine dosimeters behind the shield

Single event effects by atmospheric neutrons in commercial (COTS) normally-off GaN HEMT: Poster presented at 30th European Conference on Radiation and its Effects on Components and Systems, RADECS 2019, Montpellier, France, September 16-20, 2019

Results of SEE testing of commercial high power normally-off GaN-devices with an atmospheric-like neutron spectrum at ChipIR are presented. Three different designs of GaN-HEMTs and one SiC-MOSFET were tested at different voltages and the cross sections were determined