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Software Defined Radio for on-line interaction with beam processes in the heavy ion storage ring ESR
Authors:
M. S. Sanjari,
Yu. A. Litvinov,
S. Litvinov,
B. Peter,
R. J. Chen,
D. Dmytriiev,
C. Forconi,
J. Glorius,
G. W. Hudson-Chang,
H. Hüther,
E. B. Menz,
Z. Nunns,
T. Ohnishi,
Zs. Podolyak,
J. Stadlmann,
Th. Stöhlker,
Q. Wang,
T. Yamaguchi,
Y. Yamaguchi,
X. Yan,
A. Yano,
Y. Yu
Abstract:
The application of software defined radio in on-line interaction with the beam processes of the heavy ion storage ring is presented. It is discussed how this new technique can enhance the beam time efficiency and open up new measurement possibilities. Discussed is a specific example to halt the accelerator running in case a rare stored particle is identified online.
The application of software defined radio in on-line interaction with the beam processes of the heavy ion storage ring is presented. It is discussed how this new technique can enhance the beam time efficiency and open up new measurement possibilities. Discussed is a specific example to halt the accelerator running in case a rare stored particle is identified online.
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Submitted 29 April, 2025;
originally announced April 2025.
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Characterization of the forcing and sub-filter scale terms in the volume-filtering immersed boundary method
Authors:
Dave Himanshu,
Herrmann Marcus,
Brady Peter,
M. Houssem Kasbaoui
Abstract:
We present a characterization of the forcing and the sub-filter scale terms produced in the volume-filtering immersed boundary (VF-IB) method by Dave et al, JCP, 2023. The process of volume-filtering produces bodyforces in the form of surface integrals to describe the boundary conditions at the interface. Furthermore, the approach also produces unclosed subfilter scale (SFS) terms. The level of co…
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We present a characterization of the forcing and the sub-filter scale terms produced in the volume-filtering immersed boundary (VF-IB) method by Dave et al, JCP, 2023. The process of volume-filtering produces bodyforces in the form of surface integrals to describe the boundary conditions at the interface. Furthermore, the approach also produces unclosed subfilter scale (SFS) terms. The level of contribution from SFS terms on the numerical solution depends on the filter width. In order to understand these terms better, we take a 2 dimensional, varying coefficient hyperbolic equation shown by Brady & Liverscu, JCP, 2021. This case is chosen for two reasons. First, the case involves 2 distinct regions seperated by an interface, making it an ideal case for the VF-IB method. Second, an existing analytical solution allows us to properly investigate the contribution from SFS term for varying filter sizes. The latter controls how well resolved the interface is. The smaller the filter size, the more resolved the interface will be. A thorough numerical analysis of the method is presented, as well as the effect of the SFS term on the numerical solution. In order to perform a direct comparison, the numerical solution is compared to the filtered analytical solution. Through this, we highlight three important points. First, we present a methodical approach to volume filtering a hyperbolic PDE. Second, we show that the VF-IB method exhibits second order convergence with respect to decreasing filter size (i.e. making the interface sharper). Finally, we show that the SFS term scales with square the filter size. Large filter sizes require modeling the SFS term. However, for sufficiently finer filters, the SFS term can be ignored without any significant reduction in the accuracy of solution.
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Submitted 12 July, 2024;
originally announced July 2024.
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A practical review on the measurement tools for cellular adhesion force
Authors:
Rita Ungai-Salanki,
Beatrix Peter,
Tamas Gerecsei,
Norbert Orgovan,
Robert Horvath,
Balint Szabo
Abstract:
Cell cell and cell matrix adhesions are fundamental in all multicellular organisms. They play a key role in cellular growth, differentiation, pattern formation and migration. Cell-cell adhesion is substantial in the immune response, pathogen host interactions, and tumor development. The success of tissue engineering and stem cell implantations strongly depends on the fine control of live cell adhe…
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Cell cell and cell matrix adhesions are fundamental in all multicellular organisms. They play a key role in cellular growth, differentiation, pattern formation and migration. Cell-cell adhesion is substantial in the immune response, pathogen host interactions, and tumor development. The success of tissue engineering and stem cell implantations strongly depends on the fine control of live cell adhesion on the surface of natural or biomimetic scaffolds. Therefore, the quantitative and precise measurement of the adhesion strength of living cells is critical, not only in basic research but in modern technologies, too. Several techniques have been developed or are under development to quantify cell adhesion. All of them have their pros and cons, which has to be carefully considered before the experiments and interpretation of the recorded data. Current review provides a guide to choose the appropriate technique to answer a specific biological question or to complete a biomedical test by measuring cell adhesion.
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Submitted 29 May, 2019;
originally announced May 2019.
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Effect of the curvature and the β parameter on the nonlinear dynamics of a drift tearing magnetic island
Authors:
Magali Muraglia,
Olivier Agullo,
Masatoshi Yagi,
Sadruddin Benkadda,
Beyer Peter,
Xavier Garbet,
Sanae -I. Itoh,
Kimitaka Itoh,
Abhijit Sen
Abstract:
We present numerical simulation studies of 2D reduced MHD equations investigating the impact of the electronic βparameter and of curvature effects on the nonlinear evolution of drift tearing islands. We observe a bifurcation phenomenon that leads to an amplification of the pressure energy, the generation of E \times B poloidal flow and a nonlinear diamagnetic drift that affects the rotation of the…
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We present numerical simulation studies of 2D reduced MHD equations investigating the impact of the electronic βparameter and of curvature effects on the nonlinear evolution of drift tearing islands. We observe a bifurcation phenomenon that leads to an amplification of the pressure energy, the generation of E \times B poloidal flow and a nonlinear diamagnetic drift that affects the rotation of the magnetic island. These dynamical modifications arise due to quasilinear effects that generate a zonal flow at the onset point of the bifurcation. Our simulations show that the transition point is influenced by the βparameter such that the pressure gradient through a curvature effect strongly stabilizes the transition. Regarding the modified rotation of the island, a model for the frequency is derived in order to study its origin and the effect of the βparameter. It appears that after the transition, an E \times B poloidal flow as well as a nonlinear diamagnetic drift are generated due to an amplification of the stresses by pressure effects.
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Submitted 23 March, 2011;
originally announced March 2011.