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The Belle II vertex detector integration
Kodyš,, P.,Abudinen, F.,Ackermann, K.,Ahlburg, P.,Aihara, H.,Albalawi, M.,Alonso, O.,Andricek, L.,Ayad, R.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Bai, Y.,Barberio, E.,Baroncelli, Ti.,Baronce Elsevier 2019 Nuclear Instruments & Methods in Physics Research. Vol.936 No.-
<P><B>Abstract</B></P> <P>The Belle II experiment comes with a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric <SUP> e + </SUP> <SUP> e − </SUP> collider with energies tuned to ϒ ( 4 S ) resonance s = 10 . 588 GeV. The accelerator has successfully completed the first phase of commissioning in 2016 and the first electron–positron collisions in Belle II took place in April 2018. Belle II features a newly designed silicon vertex detector based on DEPFET pixel and double-sided strip layers. Currently, a subset of the vertex detector is installed (Phase 2 of the experiment). Installation of the full detector (Phase 3) will be completed by the end of 2018.</P> <P>This paper describes the Phase 2 arrangement of the Belle II silicon vertex detector, with focus on the interconnection of detectors and their integration with the software framework of Belle II. Alignment issues are discussed based on detector simulations and first acquired data.</P>
N. Al Saqri,J.F. Felix,M. Aziz,D. Jameel,C.I.L. de Araujo,H. Albalawi,F. Al Mashary,H. Alghamdi,D. Taylor,M. Henini 한국물리학회 2015 Current Applied Physics Vol.15 No.10
This work reports the effect of gamma (γ-) irradiation on dilute GaAsN with nitrogen concentrations ranging from 0.2 to 1.2% with post-irradiation stability using CurrenteVoltage (I-V) and Deep Level Transient Spectroscopy (DLTS) measurements in the temperature range from 10 K to 450 K. The IeV results indicate that the irradiation effect was more pronounced in the samples with nitrogen concentration of 0.4%. Additionally, the irradiated samples showed an ideality factor higher than the as-grown samples. On the other hand, for temperatures above 265 K the barrier height of the irradiated samples with 0.8% nitrogen is higher than the as-grown samples. The DLTS measurements revealed that after irradiation the number of traps either decreased remained constant, or new traps are created depending on the concentration of nitrogen. For samples with N = 0.2% - 0.4% the number of traps after irradiation decreased, whereas for samples with N = 0.8% - 1.2 % the number of traps remained the same. However, the properties of some traps such as capture cross-sections and density increased by about 2 orders of magnitude. The origin of the defects present before and after irradiation are discussed and correlated.