G. Kemmerling

Forschungszentrum Jülich

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H. Kleines

Forschungszentrum Jülich

P. Wüstner

Forschungszentrum Jülich

R. Engels

Forschungszentrum Jülich

H. Ohm

Forschungszentrum Jülich

P. Kulessa

Institute of Nuclear Physics

K. Pysz

Institute of Nuclear Physics, Polish Academy of Sciences

A. Magiera

Jagiellonian University

A. Kupść

National Centre for Nuclear Research

H. Calén

Uppsala University

P. Moskal

Jagiellonian University

Cooperative Institutions

Centre National de la Recherche Scientifique

288

Forschungszentrum Jülich

281

Joint Institute for Nuclear Research

263

European Organization for Nuclear Research

244

RWTH Aachen University

205

GSI Helmholtz Centre for Heavy Ion Research

167

Institut National de Physique Nucléaire et de Physique des Particules

166

A. Alikhanyan National Laboratory

160

Johannes Gutenberg University Mainz

158

Universität Hamburg

150

Author Statistics

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Technical Design Report for the PANDA Endcap Disc DIRC

HAL (Le Centre pour la Communication Scientifique Directe) (2022)

Fabrizio Davı́W. Erni B. Krusche M. Steinacher N. Walford

PANDA (anti-Proton ANnihiliation at DArmstadt) is planned to be one of the four main experiments at the future international accelerator complex FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. It is going to address fundamental questions of hadron physics and quantum chromodynamics using cooled antiproton beams with a high intensity and and momenta between 1.5 and 15 GeV/c. PANDA is designed to reach a maximum luminosity of 2x10^32 cm^2 s. Most of the physics programs require an excellent particle identification (PID). The PID of hadronic states at the forward endcap of the target spectrometer will be done by a fast and compact Cherenkov detector that uses the detection of internally reflected Cherenkov light (DIRC) principle. It is designed to cover the polar angle range from 5{\deg} to 22{\deg} and to provide a separation power for the separation of charged pions and kaons up to 3 standard deviations (s.d.) for particle momenta up to 4 GeV/c in order to cover the important particle phase space. This document describes the technical design and the expected performance of the novel PANDA Disc DIRC detector that has not been used in any other high energy physics experiment (HEP) before. The performance has been studied with Monte-Carlo simulations and various beam tests at DESY and CERN. The final design meets all PANDA requirements and guarantees suffcient safety margins.

Particle identification

Antiproton

DESY

Source

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Citations (6)

WASA-at-COSY Collaboration

P. Adlarson W. Augustyniak W. Bardan M. Bashkanov H. Bhatt

Source

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Citations (80)

Study of doubly strange systems using stored antiprotons

Nuclear Physics A (2016)

B. Singh W. Erni B. Krusche M. Steinacher N. K. Walford

Antiproton

10.1016/j.nuclphysa.2016.05.014

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Citations (26)

A new two-dimensional scintillation detector system for small-angle neutron scattering experiments

IEEE Transactions on Nuclear Science (2001)

G. Kemmerling R. Engels N. Bussmann U. Clemens M. Heiderich

A new two-dimensional position-sensitive detector system for small-angle neutron scattering experiments is under development. It is based on a 60/spl times/60 cm/sup 2/ large /sup 6/Li-glass scintillator for the neutron capture and dispersion of the emitted light on an array of photomultiplier tubes for the derivation of the event position. For subthermal neutrons of 8 /spl Aring/, an efficiency of 96% and a spatial resolution of 8 mm are to be achieved. Major improvements have been made in the signal- and data-processing branch, which aims at an electronic dead time of 1 /spl mu/s. A fast digitalization method using free-running analog-to-digital converters for each photomultiplier combined with field-programmable gate arrays for a parallel event detection in all channels has been applied. A subsequent farm of up to 16 floating-point digital signal processors is used to provide enough computing power for an improved reconstruction of the event position according to a maximum likelihood method.

Neutron Detection

Nuclear electronics

SIGNAL (programming language)

Particle detector

10.1109/23.958733

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Citations (22)

Precision reconstruction of charged tracks with simultaneous electron identification in a gaseous detector using transition radiation

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (1991)

H. Grässler M. Hohlmann G. Kemmerling S. Masson W. Pilgram

Transition radiation

radiation damage

Radiator (engine cooling)

10.1016/0168-9002(91)91095-d

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Citations (7)

Thermal neutron detection with <sup>6</sup>Li converters

IEEE conference record/IEEE conference record - Nuclear Science Symposium & Medical Imaging Conference. (2007)

R. Engels G. Kemmerling H. Nöldgen J. Schelten

In this detector research and development the key product is a 100 mum thin ⁶ Li metal foil, which is to be used as converter for neutron detection. Due to the chemical reactivity of metallic lithium a special treatment is required for fabrication of such foils. Preparation by rolling lithium in a glove box, protection with ultra thin polymer films against oxidation in air, observation of oxidation by weight increase, mounting and using the ⁶ Li converters in detector test facilities are described and experimental results are presented for two detector types.

10.1109/nssmic.2007.4436402

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Citations (3)

Performance Issues of the New DAQ System for WASA at COSY

H. Kleines K. Zwoll P. Wüstner W. Erven P. Kämmerling

For the operation of the WASA (wide angle shower apparatus) detector system at the Cooler Synchrotron COSY in Forschungszentrum Julich (FZJ) a new DAQ system has been developed, which conforms to the third generation of the DAQ systems at COSY. This comprises new readout electronics based on an optimized parallel bus with LVDS technology and FPGA-controlled event and buffer management. The new DAQ system has been successfully commissioned in autumn 2006. Further developments aiming at performance optimizations are in progress. The implementation status is presented and performance issues are discussed.

10.1109/rtc.2007.4382807

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Citations (2)

Commissioning of thermal neutron detector boxes for the time-of-flight spectrometer TOPAS

G. Kemmerling M. Boucher Klaus Bussmann R. Engels H. Kämmerling

The thermal neutron time-of-flight spectrometer TOPAS will be equipped with a large detector system based on 2 meter long position sensitive ³ He-tubes, each having an internal pressure of 10 bar ³ He. In total there are 288 tubes with an overall active area of 14.7 m ² . In order to decouple the detector from the vacuum chamber as well as to facilitate assembly and maintenance, the ³ He-tubes are grouped on modular detector boxes. 16 tubes are mounted per detector box, which houses the digitizing readout electronics in a vacuum tight compartment at the back. During commisioning of the detector boxes, special emphasis has been put on the straightness of the tubes, as the planarity and parallelism of the their mounting points must ensure a straightness of below 1.2 mm. Additionally, the homogeneity of the signal amplitudes for neutron events has also been inspected, as the tube manufacturer pointed us to deficiencies of the wire quality at the time of the tube production. Measurements for the ³ He-tube and detector box acceptance have been carried out with a moderated ²⁵² Cf-source. The signal amplitudes and event positions have been simultaneously taken and studied for the selection and adjustment of the tubes, which is reported in this paper.

10.1109/nssmic.2018.8824602

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Citations (1)

ANTS — a simulation package for secondary scintillation Anger-camera type detector in thermal neutron imaging

Journal of Instrumentation (2012)

A. Morozov I. Defendi R. Engels F.A.F. Fraga M.M.F.R. Fraga

A custom and fully interactive simulation package ANTS (Anger-camera type Neutron detector: Toolkit for Simulations) has been developed to optimize the design and operation conditions of secondary scintillation Anger-camera type gaseous detectors for thermal neutron imaging. The simulation code accounts for all physical processes related to the neutron capture, energy deposition pattern, drift of electrons of the primary ionization and secondary scintillation. The photons are traced considering the wavelength-resolved refraction and transmission of the output window. Photo-detection accounts for the wavelength-resolved quantum efficiency, angular response, area sensitivity, gain and single-photoelectron spectra of the photomultipliers (PMTs). The package allows for several geometrical shapes of the PMT photocathode (round, hexagonal and square) and offers a flexible PMT array configuration: up to 100 PMTs in a custom arrangement with the square or hexagonal packing. Several read-out patterns of the PMT array are implemented. Reconstruction of the neutron capture position (projection on the plane of the light emission) is performed using the center of gravity, maximum likelihood or weighted least squares algorithm. Simulation results reproduce well the preliminary results obtained with a small-scale detector prototype. ANTS executables can be downloaded from http://coimbra.lip.pt/∼andrei/.

Neutron Detection

Photocathode

10.1088/1748-0221/7/08/p08010

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Citations (6)

Properties of the neutron detector based on ionisation chamber with /sup 6/Li converters

IEEE Symposium Conference Record Nuclear Science 2004. (2005)

R. Engels U. Clemens G. Kemmerling J. Schelten

The ICC neutron detector is an ionisation chamber with three neutron absorbing converter electrodes of /sup 6/Li metal foils. On both sides the foils face collector electrodes that are positively biased. The neutron detection was investigated at the pulsed neutron source of the Argonne National Laboratory. The induced charge due to drifting electrons that are generated by the energetic /sup 3/H recoil nucleus in the C/sub 2/F/sub 6/ gas between the electrodes was measured as function of gas pressure, gas contamination, and applied drift voltage. The neutron detection efficiency was determined and the gamma insensitivity was estimated. The pulse heights were calibrated by the induced charge from test pulses. The timing characteristics of the detector pulses were assessed, and TOF measurements demonstrated the usefulness of the detector. First neutron diffraction experiments were made with structured collection electrodes for position-sensitive detection and for estimating the achievable spatial resolution.

Neutron Detection

Recoil

Particle detector

10.1109/nssmic.2004.1462239

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