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The Belle II SVD data readout system
Thalmeier, R.,Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, Ti.,Baroncelli, To.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bergauer, Elsevier BV * North-Holland 2017 Nuclear Instruments & Methods in Physics Research. Vol. No.
<P><B>Abstract</B></P> <P>The Belle II Experiment at the High Energy Accelerator Research Organization (KEK) in Tsukuba, Japan, will explore the asymmetry between matter and antimatter and search for new physics beyond the standard model.</P> <P>172 double-sided silicon strip detectors are arranged cylindrically in four layers around the collision point to be part of a system which measures the tracks of the collision products of electrons and positrons. A total of 1748 radiation-hard APV25 chips read out 128 silicon strips each and send the analog signals by time-division multiplexing out of the radiation zone to 48 Flash Analog Digital Converter Modules (FADC).</P> <P>Each of them applies processing to the data; for example, it uses a digital finite impulse response filter to compensate line signal distortions, and it extracts the peak timing and amplitude from a set of several data points for each hit, using a neural network.</P> <P>We present an overview of the SVD data readout system, along with front-end electronics, cabling, power supplies and data processing.</P>
The Belle II silicon vertex detector: Assembly and initial results
Thalmeier, R.,Casarosa, G.,Schwanda, C.,Aihara, H.,Aziz, T.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, Ti.,Baroncelli, To.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P.K.,Bertacchi, V.,Betta Elsevier 2019 Nuclear Instruments & Methods in Physics Research. Vol.936 No.-
<P><B>Abstract</B></P> <P>The “chip-on-sensor” concept of this detector minimizes the distance of the signal propagation from the double-sided silicon detector strips to the readout chips and thus reduces noise from strip capacitance. One half of the detector is built, the second half is being assembled at the time of writing. Prototypes have been tested in several test beams as well as in the so-called Phase 2 setup inside the detector structure. First results from a commissioning run of the Belle-II prototype SVD detector are presented. The measured signal-to-noise and timing performance are found to be according to design specifications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Belle-II Silicon Vertex Detector is based on a “chip-on-sensor” concept. </LI> <LI> One half of the detector is built, the second half is being assembled. </LI> <LI> Prototypes have been tested in a commissioning run inside the detector structure. </LI> <LI> The measured SNR and hit time are found to be according to design specifications. </LI> </UL> </P>
Magnetic Moment Screening in the Correlated Kondo Lattice Model
Peter Thalmeier,Mohammad Siahatgar,Burkhard Schmidt,Gertrud Zwicknagl 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
The local moments, magnetic correlations and susceptibility in the 2D half-filled correlated Kondo lattice model are studied. We calculate their dependence on the control parameters given by local exchange coupling JK and Coulomb repulsion U. Exact diagonalization (ED) approach for ground state properties as well as finite temperature Lanczos method (FTLM) for the uniform susceptibility are employed for small tiles on the square lattice. The competition of on-site screening and induced inter-site correlations leads to non-monotonic local moment dependence on U for weak Kondo coupling JK. In the large U limit the numerical results are compared to those of the analytical bond operator method in mean field treatment. The variation of the Kondo temperature scale with U is obtained from the temperature dependence of the susceptibility. A monotonic increase with U is found.