R. Klasen

General Atomics (United States)

Author Statistics

Papers

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i-10 index

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Document Type

Co-Authors

S. Maldaner

Ruhr University Bochum

F. Feldbauer

Institute of High Energy Physics

M. Fritsch

Ruhr University Bochum

P. Achenbach

Thomas Jefferson National Accelerator Facility

B. Cederwall

KTH Royal Institute of Technology

M. Urban

University of Bonn

R. Kliemt

GSI Helmholtz Centre for Heavy Ion Research

M. Yu. Barabanov

Joint Institute for Nuclear Research

V. Rigato

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro

W. Lauth

Johannes Gutenberg University Mainz

Cooperative Institutions

GSI Helmholtz Centre for Heavy Ion Research

155

Joint Institute for Nuclear Research

128

Johannes Gutenberg University Mainz

127

University of Giessen

122

Kurchatov Institute

118

Institute of High Energy Physics

112

Forschungszentrum Jülich

106

European Organization for Nuclear Research

101

Ruhr University Bochum

A. Alikhanyan National Laboratory

Author Statistics

Papers

Citation

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Study of excited $$\varvec{\varXi }$$ baryons with the $$\overline{\text{ P }}$$ANDA detector

The European Physical Journal A (2021)

G. Barucca Fabrizio Davı́Giovanni Lancioni P. Mengucci Luigi Montalto

The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards $N^*$ and $\Delta$ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $N^*$ and $\Delta$ spectra. The future antiproton experiment PANDA will provide direct access to final states containing a $\bar{\Xi}\Xi$ pair, for which production cross sections up to $\mu$b are expected in $\bar{p}p$ reactions. With a luminosity of $L=10^{31}\,cm^{-2}s^{-1}$ in the first phase of the experiment, the expected cross sections correspond to a production rate of $\sim 10^6$ events$/$day. With a nearly $4\pi$ detector acceptance, PANDA will thus be a hyperon factory. In this study, reactions of the type $\bar{p}p\rightarrow \bar{\Xi}^+ \Xi^{*-}$ as well as $\bar{p}p\rightarrow \bar{\Xi}^{*+} \Xi^{-}$ with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between $3\,\%$ and $5\,\%$. This allows high statistics data to be collected within a few weeks of data taking.

Bar (unit)

10.1140/epja/s10050-021-00444-5

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Citations (6)

Technical design report for the $\overline{{\rm{P}}}\mathrm{ANDA}$ Barrel DIRC detector

Journal of Physics G Nuclear and Particle Physics (2018)

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

This documents describes the technical design and the expected performance of the Barrel DIRC detector for the PANDA experiment. The Barrel DIRC will provide hadronic charged particle identification in the polar angle range of $22^\circ$ to $140^\circ$ for particle momenta between 0.5 GeV/c and 3.5 GeV/c. The design is based on the successful BaBar DIRC with several key improvements. The performance and system cost were optimized in detailed detector simulations and validated with full system prototypes using particle beams at GSI and CERN. The final design meets or exceeds the PID goal of clean $π/K$ separation with at least 3 standard deviations over the entire phase space of charged kaons in the Barrel DIRC.

Particle identification

Particle (ecology)

10.1088/1361-6471/aade3d

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Citations (38)

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)

Development and Fabrication of New Accelerator Grid Modules for Ion Sources in the 80 keV Neutral Beam Lines for DIII-D

21st IEEE/NPS Symposium on Fusion Engineering SOFE 05 (2005)

H.J. Grunloh M. Madruga J.L. Busath R.W. Callis H.K. Chiu

In 2001, efforts commenced to develop the technology to fabricate new accelerator grid modules for the ion sources in the 80 keV neutral beam lines for DIII-D. This campaign arose after water leaks began occurring with increasing frequency in the molybdenum grid rails and stainless steel water bellows of the original grid modules, fabricated in the mid-1980s. Root causes of the damage were determined and operational adjustments were made to correct the problems, but the string of failures depleted the DIII-D program of its supply of spare grid rail modules. The program was unable to procure new grid rail modules from any commercial source, nor was it able to obtain the molybdenum grid rails needed in two of the four module types. Efforts were then focused on fabricating new molybdenum rails required to make all four module types as well as on developing the procedures to successfully braze together the molybdenum and stainless steel parts into modules. Producing the diamond-shaped cross-section plasma grid rails proved to be very difficult, and a parallel task was initiated to design a modified source grid module that would employ circular cross-section grid rails while maintaining the most critical parameters of the original design. The brazing development program produced procedures that yielded consistently successful brazes in all the joint types present in all the modules. The parts for new grid modules, including the new modules containing circular cross section plasma grids, were fabricated. The new brazing procedures were successfully utilized to produce four new plasma grid modules of the new design. These modules were installed in an ion source and tested to full power before being utilized in service at the end of the 2005 DIII-D experimental campaign. An overview of the ion source development program is presented and a summary of the performance of the ion source containing the new plasma grid modules is reported

Brazing

Bellows

Spare part

10.1109/fusion.2005.252933

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Citations (1)

Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR

arXiv (Cornell University) (2016)

PANDA Collaboration B. K. Singh W. Erni B. Krusche M. Steinacher

Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel $\bar p p \to e^+ e^-$ is studied on the basis of two different but consistent procedures. The suppression of the main background channel, $\textit{i.e.}$ $\bar p p \to π^+ π^-$, is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance.

Bar (unit)

SIGNAL (programming language)

Momentum (technical analysis)

Momentum transfer

Basis (linear algebra)

10.48550/arxiv.1606.01118

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Citations (4)

An Experimental Demonstration of Target Injection for Inertial Fusion Energy

APS (2004)

Damian Frey D. T. Goodin R. W. Stemke R. W. Petzoldt T. Drake

Source

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Citations (0)

Luminosity determination with the PANDA luminosity detector

Stefan Pflueger F. Feldbauer M. Fritsch Prometeusz Jasinski R. Klasen

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Citations (0)

Extraction of the luminosity at PANDA

Verhandlungen der Deutschen Physikalischen Gesellschaft (2017)

Stefan Pflueger F. Feldbauer R. Klasen Heinrich Leithoff S. Maldaner

Source

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Citations (0)

Fabrication and repair of ion source components in the 80 keV neutral beam lines for DIII-D

20th IEEE/NPSS Symposium onFusion Engineering, 2003. (2006)

H.J. Grunloh J.L. Busath R.W. Callis Herb Chin M. DiMartino

After eight years of operation, leaks began to develop in critical components of the ion sources of the 80 keV neutral beam lines in DIII-D. Operational adjustments were made that seemed to remedy the problems, but five years later leaks began occurring again, this time with greater frequency. Failures occurred in the stainless steel bellows and molybdenum rails of the grid rail modules as well as in the Langmuir probes. Failure analyses identified several root causes of the leaks and operational adjustments were again made to mitigate the problems, but the rash of failures depleted the program's supply of spare grid rail modules and probes and removed one of the ion sources from regular operation. Fifteen years after their original fabrication, the ion source components were no longer commercially available. In 2001 a program was initiated to fabricate new grid rail modules, including new molybdenum grid rails, bellows, and stainless steel grid rail holders, as well as new Langmuir probes. In parallel, components removed from service due to leaks were to be repaired with new rails and bellows and returned to service. An overview of the root causes of the service failures is offered, details of the repair processes are described, and a summary and evaluation of the fabrication procedures for the new molybdenum rails, grid modules, and Langmuir probes are given.

Bellows

Spare part

10.1109/fusion.2003.1426688

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Citations (1)

Technical design report for the endcap disc DIRC ^*

Journal of Physics G Nuclear and Particle Physics (2022)

Fabrizio Davı́W. Erni B. Krusche M. Steinacher N. K. 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° to 22° 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

10.1088/1361-6471/abb6c1

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Citations (1)