[en] The aim of this project is to build a quantum computing processor with integrated ion-photon interface. It consists of an ion trap with zones for ion loading, QIP and a zone with an integrated optical cavity for enhanced communication. The electrode structure is designed for dual species operation, ion swapping and ion chain splitting. To achieve highly efficient high-fidelity quantum communication between processors, the system is equipped with an integrated cavity, strongly coupling to the trapped ion. To realize this, we designed a chip, which was manufactured using femtosecond laser induced selective etching (FLISE) from a fused silica substrate, and subsequently gold coated. Employing trenches between the electrodes the chip can be metalised without masks. The cavity is formed of fused silica rods instead of optical fibres as has been used previously [1] in order to improve the photon collection efficiency. In previous works, researchers have reported effective photonic entanglement by using high-numerical-aperture lens’ to couple two ions’ qubits into single-mode optical fibres to attain high rate and fidelity [2]. For our system, we expect significantly higher entanglement rates with high fidelity due to strong coupling operation. [1] H. Takahashi et al., Phys. Rev. Lett., vol. 124, p. 013602, (2020). [2] L. J. Stephenson et al., Phys. Rev. Lett., vol. 124, p. 110501, (2020).

[en] It was the objective of this study to develop and carry out an experimental program which would provide additional insight into the mechanics of fluid--solid interaction with respect to the response of a set of coaxial cylinders with water in the annulus. Such configurations are found in nuclear reactors in the vessel wall-thermal liner. The effects of cylinder thickness and the fluid filled annulus gap size on the resonant frequencies and mode shapes of the cylinders (either singly or coupled in air and a water environment) are presented in this paper; also included is an evaluation of damping for selected gaps and cylinder thicknesses. Details of the experimental setup and procedures are also outlined

[en] CZT material quality improvement has been achieved by optimizing the crystal growth process. N-type conductivity has been measured on as-grown, undoped, Cd_0.9Zn_0.1Te. Cd_0.85Zn_0.15Te crystals have been grown. for producing high resistivity CZT radiation detectors. The best FWHM of ⁵⁷Co 122KeV spectrum was measured to be 3.7% and (μτ)_e was 3 x 10^-3 cm²V^-1. The microscopic gamma ray response using a beam size of 10 (micro)m has been used to map the entire 4 mm x 4 mm detector. Several black spots indicating no signal responses were observed while all other areas showed an average of 65-70% collection efficiency. The black spots suggest that at those locations, the Te precipitates are larger than 10 (micro)m. Detailed microscopic infrared transmission measurement on the sample found that most Te precipitates have sizes of 4-6 (micro)m. Theoretical analysis of the results suggests that singly and doubly ionized Te_CdV_Cd² might be the shallow and deep donors previously assigned to Te_Cd by us

[en] A device for achieving ignition of a plasma with ohmic heating is described comprising: means for defining a toroidal plasma chamber,a and confining gas therein, and means including electrically conductive coils for generating plasma within the chamber and for confining and shaping such plasma substantially into and filling a predetermined single region of the chamber without an axisymmetric internal separatix and ohmically heating the confined plasma to ignition. The predetermined region is toroidal with a major axis defining an axial direction parallel thereto and a transaxial direction perpendicular to the axis and having an axial cross section with an elongation, k, greater than 4, where k is the ratio of the maximum axial dimension of the cross section to the maximum transaxial dimension of the cross section

[en] Analytical capabilities for fluid-solid situations are in the process of being developed. However, since the overall phenomenon of fluid-solid interaction is not thoroughly understood, it was the objective of this study to develop and carry out an experimental program which would provide additional insight into the mechanics of fluid-solid interaction. Since one of the primary components in a nuclear power system is the reactor vessel and the thermal liner, the experimental study described in this work was limited to the response of a set of coaxial cylinders with water in the annulus. The effects of cylinder thickness and the fluid filled annulus gap size on the resonant frequencies and mode shapes of the cylinders are presented; also included is an evaluation of damping for selected gaps and cylinder thicknesses. Details of the experimental setup and procedures are also outlined

[en] We investigate the temperature dependence of the instanton content of gluon fields, using unquenched lattice QCD and the cooling method. The topological susceptibility arising from instantons decreases rapidly below the phase-transition temperature T_c (∼150 MeV), becoming practically zero at T∼T_c. The dominant caloron size parameter deduced from the correlation function decreases from about 0.9 fm below T_c to 0.4 fm at 1.3T_c. The instanton charge distribution is Poissonian above T_c with deviations at low temperature

No abstract available

[en] Neoclassical transport coefficients for ion and impurity species in the plateau to Pfirsch--Schlueter regime are calculated using sources of particles and heat as driving forces. In the Pfirsch--Schlueter regime, such sources can lead to a reversal of the usual inward flux of impurities

[en] The axisymmetric stability of tokamak equilibria with arbitrary cross section is studied numerically using the energy principle. The contribution to deltaW from the plasma region is minimized analytically with respect to displacements in the toroidal and poloidal directions. the formulation of Luest and Martensen is used for the vacuum contribution. Bessel-Fourier and other sets of trial functions are then employed to cast the minimization of deltaW into a matrix eigenvalue problem. A computer code named axisym evaluates these matrix elements and solves for the eigenvalues. The code is fully toroidal and compressible mode trial functions are included. Wall stabilization is studied by placing a conducting wall around the vacuum region

[en] Spectrometer grade, room-temperature radiation detectors have been produced on Cd_0.90Zn_0.10Te grown by the low-pressure Bridgman technique. Small amount of indium has been used to compensate the uncompensated Cd vacancies for the crystals to be semi-insulating. The properties of the detectors are critically dependent on the amount of excess Te introduced into the growth melts of the Cd_0.90Zn_0.10Te crystals and the best detectors are fabricated from crystals grown with 1.5% excess Te. Detector resolution of ⁵⁷Co and ²⁴¹Am radiation peaks are observed on all detectors except the ones produced on Cd_0.90Zn_0.10Te grown from the melt in the stoichiometric condition. The lack of resolution of these stoichiometric grown detectors is explained by a p/n conduction-type inhomogeneity model