Low Gain Avalanche Detector (LGAD) technology has been used to design and construct prototypes of time-zero detector for experiments utilizing proton and pion beams with High Acceptance Di-Electron ...Spectrometer (HADES) at GSI Darmstadt, Germany. LGAD properties have been studied with proton beams at the COoler SYnchrotron facility in Jülich, Germany. We have demonstrated that systems based on a prototype LGAD operated at room temperature and equipped with leading-edge discriminators reach a time precision below 50 ps. The application in the HADES, experimental conditions, as well as the test results obtained with proton beams are presented.
The paper presents the results of developing and creating wireless sensor networks for agriculture and medicine, which the authors have obtained during the past five years. The paper considers ...wireless sensor networks for estimating the state of plants by the method of chlorophyll fluorescence induction on large areas of agricultural land. The above networks include original smart sensors, built according to flexible architecture and containing elements of artificial intelligence based on neural networks. This construction scheme increases their performance in determining the effect of stress factors of different origins. The authors have constructed a smart remote medical monitoring system based on the wireless sensor network, which employs several wireless data exchange protocols. They also have created a diagnostic system to assess the quality of life and the symptoms associated with the diseases and (or) treatment. It determines the patient’s health state using international and national questionnaires. The operation of proposed smart measuring devices and systems is based on the knowledge-based principles of processing and analyzing the measuring data for making managerial decisions and providing recommendations. Most of the obtained results have been put into mass production.
LGAD technology for HADES, accelerator and medical applications Krüger, W.; Bergauer, T.; Galatyuk, T. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2022, Letnik:
1039
Journal Article
Recenzirano
Odprti dostop
Low Gain Avalanche Diode (LGAD) technology has been used to design and construct prototype and full-size beam detector systems for applications requiring simultaneous time and spatial precision. For ...these purposes, a dedicated LGAD strip sensor production has been conducted at Fondazione Bruno Kessler (FBK) with different strip geometries and sizes. This contribution will review a wide variety of LGAD applications ranging from the reaction time (T0) detector for experiments utilizing proton and pion beams with the High Acceptance Di-Electron Spectrometer (HADES) at GSI in Darmstadt, Germany, to beam structure monitoring at the Superconducting DArmstadt LINear ACcelerator (S-DALINAC) at the Technische Universität Darmstadt operated in energy recovery mode and medical applications at the MedAustron facility in Wiener Neustadt, Austria. We will also give a prospect of further upgrade projects at GSI and FAIR facilities.
The production of
Σ
0
hyperons in proton proton collisions at a beam kinetic energy of 3.5 GeV impinging on a liquid hydrogen target was investigated using data collected with the HADES setup. The ...total production cross section is found to be
σ
(
p
K
+
Σ
0
)
=
17.7
±
1.7
(
s
t
a
t
)
±
1.6
(
s
y
s
t
)
µb. Differential cross section distributions of the exclusive channel
p
p
→
p
K
+
Σ
0
were analyzed in the center-of-mass, Gottfried–Jackson and helicity reference frames for the first time at the excess energy of 556 MeV. The data support the interplay between pion and kaon exchange mechanisms and clearly demonstrate the contribution of interfering nucleon resonances decaying to
K
+
Σ
0
. The Bonn–Gatchina partial wave analysis was employed to analyse the data. Due to the limited statistics, it was not possible to obtain an unambiguous determination of the relative contribution of intermediate nucleon resonances to the final state. However nucleon resonances with masses around 1.710
GeV
/
c
2
(
N
∗
(
1710
)
) and 1.900
GeV
/
c
2
(
N
∗
(
1900
)
or
Δ
∗
(
1900
)
) are preferred by the fit.
Abstract The production of $$\Sigma ^{0}$$ Σ 0 hyperons in proton proton collisions at a beam kinetic energy of 3.5 GeV impinging on a liquid hydrogen target was investigated using data collected ...with the HADES setup. The total production cross section is found to be $${\sigma (pK^{+}\Sigma ^{0}) = 17.7 \pm 1.7 (stat) \pm 1.6 (syst)}$$ σ ( p K + Σ 0 ) = 17.7 ± 1.7 ( s t a t ) ± 1.6 ( s y s t ) µb. Differential cross section distributions of the exclusive channel $${pp \rightarrow pK^{+}\Sigma ^{0}}$$ p p → p K + Σ 0 were analyzed in the center-of-mass, Gottfried–Jackson and helicity reference frames for the first time at the excess energy of 556 MeV. The data support the interplay between pion and kaon exchange mechanisms and clearly demonstrate the contribution of interfering nucleon resonances decaying to $$\textrm{K}^{+}\Sigma ^{0}$$ K + Σ 0 . The Bonn–Gatchina partial wave analysis was employed to analyse the data. Due to the limited statistics, it was not possible to obtain an unambiguous determination of the relative contribution of intermediate nucleon resonances to the final state. However nucleon resonances with masses around 1.710 $${\textrm{GeV}/\textrm{c}^{2}}$$ GeV / c 2 ( $${\textrm{N}^{*}(1710)}$$ N ∗ ( 1710 ) ) and 1.900 $${\textrm{GeV}/\textrm{c}^{2}}$$ GeV / c 2 ( $${\textrm{N}^{*}(1900)}$$ N ∗ ( 1900 ) or $${\Delta ^{*}(1900)}$$ Δ ∗ ( 1900 ) ) are preferred by the fit.
Inclusive e$^+$e$^-$ production has been studied with HADES in $\pi^-$ + p,
$\pi^-$ + C and $\pi^- + \mathrm{CH}_2$ reactions, using the GSI pion beam at
$\sqrt{s_{\pi p}}$ = 1.49 GeV. Invariant mass ...and transverse momentum
distributions have been measured and reveal contributions from Dalitz decays of
$\pi^0$, $\eta$ mesons and baryon resonances. The transverse momentum
distributions are very sensitive to the underlying kinematics of the various
processes. The baryon contribution exhibits a deviation up to a factor seven
from the QED reference expected for the dielectron decay of a hypothetical
point-like baryon with the production cross section constrained from the
inverse $\gamma$ n$\rightarrow \pi^-$ p reaction. The enhancement is attributed
to a strong four-momentum squared dependence of the time-like electromagnetic
transition form factors as suggested by Vector Meson Dominance (VMD). Two
versions of the VMD, that differ in the photon-baryon coupling, have been
applied in simulations and compared to data. VMD1 (or two-component VMD)
assumes a coupling via the $\rho$ meson and a direct coupling of the photon,
while in VMD2 (or strict VMD) the coupling is only mediated via the $\rho$
meson. The VMD2 model, frequently used in transport calculations for dilepton
decays, is found to overestimate the measured dielectron yields, while a good
description of the data can be obtained with the VMD1 model assuming no phase
difference between the two amplitudes. Similar descriptions have also been
obtained using a time-like baryon transition form factor model where the pion
cloud plays the major role.
Hadron production (\(\pi^\pm\), proton, \(\Lambda\), \(K_S^0\), \(K^\pm\)) in \(\pi^- + \mathrm{C}\) and \(\pi^- + \mathrm{W}\) collisions is investigated at an incident pion beam momentum of ...\(1.7~\mathrm{GeV}/c\). This comprehensive set of data measured with HADES at SIS18/GSI significantly extends the existing world data on hadron production in pion induced reactions and provides a new reference for models that are commonly used for the interpretation of heavy-ion collisions. The measured inclusive differential production cross-sections are compared with state-of-the-art transport model (GiBUU, SMASH) calculations. The (semi-) exclusive channel \(\pi^- + A \rightarrow \Lambda + K_S^0 +X\), in which the kinematics of the strange hadrons are correlated, is also investigated and compared to a model calculation. Agreement and remaining tensions between data and the current version of the considered transport models are discussed.
Low Gain Avalanche Detector (LGAD) technology has been used to design and construct prototypes of time-zero detector for experiments utilizing proton and pion beams with High Acceptance Di-Electron ...Spectrometer (HADES) at GSI Darmstadt, Germany. LGAD properties have been studied with proton beams at the COoler SYnchrotron (COSY) facility in J\"ulich, Germany. We have demonstrated that systems based on a prototype LGAD operated at room temperature and equipped with leading-edge discriminators reach a time precision below 50 ps. The application in the HADES, experimental conditions, as well as the test results obtained with proton beams are presented.
The production of $\Sigma^0$ hyperons in proton proton collisions at a beam
kinetic energy of 3.5 GeV impinging on a liquid hydrogen target was
investigated using data collected with the HADES setup. ...The total production
cross section is found to be $\mathrm{\sigma (pK^{+}\Sigma^{0}) \mu b = 17.7
\pm 1.7 (stat) \pm 1.6 (syst)}$. Differential cross section distributions of
the exclusive channel $\mathrm{pp \rightarrow pK^{+}\Sigma^{0}}$ were analyzed
in the center-of-mass, Gottfried-Jackson and helicity reference frames for the
first time at the excess energy of 556 MeV. The data support the interplay
between pion and kaon exchange mechanisms and clearly demonstrate the
contribution of interfering nucleon resonances decaying to
$\mathrm{K^{+}\Sigma^{0}}$. The Bonn-Gatchina partial wave analysis was
employed to analyse the data. Due to the limited statistics, it was not
possible to obtain an unambiguous determination of the relative contribution of
intermediate nucleon resonances to the final state. However nucleon resonances
with masses around 1.710 $\mathrm{GeV/c^{2}}$ ($\mathrm{N^{*}(1710)}$) and
1.900 $\mathrm{GeV/c^{2}}$ ($\mathrm{N^{*}(1900)}$ or
$\mathrm{\Delta^{*}(1900)}$) are preferred by the fit.
PDF
