A. Bechteler

PNSensor (Germany)

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F-64 Expanding the Detector Efficiency of Silicon Drift Detectors with Optimized Radiation Entrance Window

Powder Diffraction (2008)

A. Niculae H. Soltau G. Lutz P. Lechner A. Bechteler

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Content (measure theory)

Particle detector

10.1154/1.2951638

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A new spectroscopic imager for x-rays from 0.5 keV to 150 keV combining a fully depleted pnCCD coupled to a columnar CsI(Tl) scintillator with fano limited energy resolution and deep subpixel spatial resolution

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray (2020)

Dieter Schlosser R. Hartmann A. Bechteler P. Holl Mohammad Shokr

Detectors with high energy and position resolution over a wide energy range are required for space telescopes in high energy astrophysics missions. By combining a low noise fully depleted pnCCD detector with a columnar CsI(Tl) scintillator, an energy dispersive spatially resolving detector can be realized with high quantum efficiency in the range from below 0.5 keV to above 150 keV. The detector is exposed to the photon source such that the X-rays first traverse the 450 μm sensitive pnCCD. If they are stopped through the photoelectric effect in the silicon detector, Fano-noiselimited energy resolution is achieved. This is true for X-rays from a few hundred eV up to approximately 15 keV. Above this energy the probability that the photon penetrates the pnCCD and converts in the CsI(Tl) scintillator is becoming higher. Due to the high atomic number of Cs (Z=55) and I (Z=53) hard X-rays are stopped efficiently in a 0.7 mm thick CsI(Tl) scintillator for photon energies up to 150 keV. The light from the scintillator is recorded with the same backilluminated pnCCD. For X-rays from a ⁵⁷Co source with an energy of 122 keV and 136 keV we achieve an energy resolution of 0.7% (FWHM=850 eV) for the direct conversion in the silicon while the energy resolution for the conversion in the CsI(Tl) is 10% (12 keV). We have performed a knife-edge experiment at 122 keV and achieved a position precision of 27 μm at that energy. Monte Carlo simulations were showing similar, fully compatible results. In case the X-rays are converted directly in the silicon the position precision is better than 10 μm. This is close to the theoretical limit of the spatial resolution in such a system, which is given by the length of the tracks of the secondary electrons in the ionizing process in silicon and CsI. Spectra, images and the results of the GEANT4 simulations will be shown.

Photoelectric effect

10.1117/12.2575676

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Insights on Sample Topography in EDX Spectroscopy with Annular SDD Detectors

Microscopy and Microanalysis (2018)

A. Schöning Roman Lackner A. Bechteler A. Liebel John M. Davis

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Sample (material)

Content (measure theory)

10.1017/s1431927618006207

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Silicon Drift Detectors in Electron Microscopy - An Over 20 Year History with a Bright Future

Microscopy and Microanalysis (2018)

A. Liebel A. Schöning A. Bechteler K. Hermenau K. Heinzinger

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Content (measure theory)

10.1017/s1431927618004476

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Concepts for an Annular Pole Piece Detector for the Simultaneous Measurement of X-Rays and Backscattered Electrons Inside a SEM

Microscopy and Microanalysis (2014)

A. Liebel R. Eckhardt Martin Bornschlegl A. Bechteler A. Niculae

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Content (measure theory)

10.1017/s1431927614007326

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Millimeter waveband semisymmetrical groove guide resonators

IEEE Microwave Magazine (2004)

A. Sevinc A. Bechteler Levent Sevgi

As an alternative to the classical waveguides, such as the H-waveguide and the rectangular waveguide, the groove waveguide has been used at millimetre wavelengths for the last couple of decades. Most of these properties are attributed to the open sides of the guide, which reduce the wall losses. This article describes a semisymmetrical groove guide resonator that is designed and analyzed analytically, numerically, and experimentally. The numerical simulations are performed via a powerful time-domain simulator based on the finite-difference, time-domain (FDTD) method. Both Cartesian- and cylindrical-coordinate FDTD packages are developed and used for the simulations. The purpose in using cylindrical-coordinate FDTD is to calibrate Cartesian-coordinate FDTD and to see the error introduced due to discretization. A measurement setup with an adjustable support platform in the frequency range of 20-40 GHz is used in the experiments.

Groove (engineering)

Waveguide

10.1109/mmw.2004.1337767

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First results on DEPFET Active Pixel Sensors fabricated in a CMOS foundry—a promising approach for new detector development and scientific instrumentation

Journal of Instrumentation (2017)

Stefan Aschauer Peter Majewski G. Lutz H. Soltau P. Holl

DEPFET Active Pixel Sensors (APS) have been introduced as focal plane detectors for X-ray astronomy already in 1996. Fabricated on high resistivity, fully depleted silicon and back-illuminated they can provide high quantum efficiency and low noise operation even at very high read rates. In 2009 a new type of DEPFET APS, the DSSC (DEPFET Sensor with Signal Compression) was developed, which is dedicated to high-speed X-ray imaging at the European X-ray free electron laser facility (EuXFEL) in Hamburg. In order to resolve the enormous contrasts occurring in Free Electron Laser (FEL) experiments, this new DSSC-DEPFET sensor has the capability of nonlinear amplification, that is, high gain for low intensities in order to obtain single-photon detection capability, and reduced gain for high intensities to achieve high dynamic range for several thousand photons per pixel and frame. We call this property "signal compression".

SIGNAL (programming language)

CMOS Sensor

10.1088/1748-0221/12/11/p11013

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Citations (10)

A compact high-speed pnCCD camera for optical and x-ray applications

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2012)

Sebastian Ihle I. Ordavo A. Bechteler R. Hartmann P. Holl

We developed a camera with a 264 × 264 pixel pnCCD of 48 μm size (thickness 450 μm) for X-ray and optical applications. It has a high quantum efficiency and can be operated up to 400 / 1000 Hz (noise≈ 2:5 ē ENC / ≈4:0 ē ENC). High-speed astronomical observations can be performed with low light levels. Results of test measurements will be presented. The camera is well suitable for ground based preparation measurements for future X-ray missions. For X-ray single photons, the spatial position can be determined with significant sub-pixel resolution.

Photon Counting

Quantum Efficiency

Position (finance)

10.1117/12.926997

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Switchless bidirectional amplifier for wireless communication systems

Microwave and Optical Technology Letters (2007)

A. Bechteler Thomas F. Bechteler

Abstract A bidirectional amplifier working at 2.4 GHz is presented in this article. The presented amplifier is able to amplify two signals simultaneously. This, since commonly used radio frequency switches are replaced by circulators. The amplifier is designed on a single small‐sized printed circuit board. First, the new amplifier circuit is proposed and characterized. Then, its advantages and design problems are analyzed. Finally, design instructions are setup in order to obtain a good performance of the switchless amplifier within the frequency band of interest. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1888–1890, 2007; Published online in Wiley Inter‐Science (www.interscience.wiley.com). DOI 10.1002/mop.22631

Circulator

Direct-coupled amplifier

Linear amplifier

Instrumentation amplifier

FET amplifier

10.1002/mop.22631

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Citations (3)

Mikrodalga oyuklu rezonatörün gerçeklenmesi, analitik ve sayısal analizi

İTÜDERGİSİ/d (2010)

A. Bechteler Levent Sevgi

Bir yari-simetrik oyuklu dalga kilavuzu rezonatoru 20 – 40 GHz frekans bandinda kullanilmak uzere tasarlanmis ve duraleminyum kullanilarak gerceklenmistir. Rezonator, biri duz digeri ise dairesel oyuk iceren iki plakadan olusmustur. Uygun hareketli bir destek sistemine monte edilen rezonatorun, gerekli olcum duzeni de hazirlanarak, frekans spektrumu gozlenmis, rezonans frekanslari ve kalite faktoru olculmustur. Oyuklu rezonator, hem analitik ve hem de sayisal yontemler kullanilarak analiz edilmistir. Kullanilan sayisal yontem zamanda sonlu farklar (FDTD) yontemidir. Olcum sonucu elde edilen rezonans frekanslari, analitik ve sayisal yontemlerden elde edilenlerle karsilastirilmistir. Anahtar Kelimeler : Oyuklu dalga kilavuzu, oyuklu rezonator, FDTD, mikrodalga, transfer rezonans metodu.

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