Recent developments to microwave tube simulator suite (MTSS) are reported in this paper. The MTSS is a full-featured tightly integrated software package for analysis and design. It includes commercial grade user interface three physics simulators. electron optics finite-element (FE) 2-D 3-D electrostatic steady-state beam trajectory code that has been used design optics, including gun collector. High-frequency circuit full FE computational electromagnetic aims get the accurate wave character...

Taste and smell alterations (TSAs) in nasopharyngeal cancer patients negatively impact their quality of life. This study is aimed at assessing the prevalence TSAs with carcinoma undergoing radiotherapy exploring correlation between The research was a cross-sectional survey conducted from June 2023 to March 2024 which Smell Survey (TSS) questionnaires were administered 135 receiving for cancer. mean total score on TSS scale 9.37 ± 4.595. A higher indicates more alterations. We enrolled...

Recent developments on our electron optics simulator (EOS) are reported in this paper. EOS is the finite-element 2-D and 3-D steady-state beam trajectory codes which target problem classes, including axisymmetric guns, gridded multibeam multistage depressed collectors at present. In order to improve accuracy, reduce computational time computer memory consumption, extend application scope, four significant advances have been made, they presented The quadratic interpolation function, has a...

Using beam wave interaction simulator (BWIS), one module of microwave tube suite (MTSS), a wideband helix TWT has been accurately simulated. The slow-wave circuit parameters are calculated by high frequency simulator.

This paper reports the development of a 3-D finite-element design tool for permanent-magnet focusing system called magnetic simulator (MFS). It is new module microwave-tube suite developed by University Electronic Science and Technology China. MFS specifically targets problem classes including periodic permanent magnet, wiggler, quadrupoles, cusped so on. code scalar potential solver magnetostatic field. can be used designing, optimizing, testing, validating permanent-magnetic systems. The...

A microwave metalens, consisting of two circular metasurfaces, is proposed to achieve zoom functionality through mechanical rotation. The phase distribution across different regions on each metasurface follows an arithmetic sequence along the angular direction. Upon rotating one overall metalens changes accordingly meet requirements focal lengths. operates at 15 GHz with a radius 80 mm. At rotation angles 0°, 45°, and 90°, expected lengths are 20 mm, 60 100 respectively. simulated electric...

<title>Abstract</title> <bold>Purpose</bold> This study aims to assess the prevalence of taste and smell alterations in patients undergoing radiotherapy for nasopharyngeal carcinoma explore correlation between these quality life.<bold>Methods</bold> A cross-sectional survey was conducted from June 2023 March 2024, utilizing Taste Smell Survey (TSS) questionnaire administered 135 receiving cancer.<bold>Results</bold> The mean total score on TSS scale 9.37 ± 4.595. Among participants, 91.1%...

This article presents an accurate and fast thermal analysis method for multistage depressed collectors (MDCs) of traveling-wave tubes using the finite-element (FEM). In this method, a novel approach named advanced multigrid nonlinear solver is proposed to significantly reduce computing cost MDCs. Based on 3-D design tool MDCs called simulator (TS) developed. By modeling behavior various MDCs, TS validated, it found that much more efficient than widely used commercial FEM codes, i.e., ANSYS...

In this paper, the finite-size vane (FSV) sheath-helix model is proposed to calculate cold-test characteristics of T-shaped loaded helical slow-wave structures (SWSs), in which effects finite number and dimensions vanes are taken into account, also angular harmonics generated due periodicity considered. Based on model, dispersion relation interaction impedance derived then applied an actual structure. The theoretical predictions compared with MAFIA simulation results, error analyzed...

In this paper, we combine the second generation of Non-dominated Sorting Genetic Algorithm (NSGA-II) [1] and Electronic Optics Simulator (EOS) [2-3] in Microwave Tube Suite (MTSS) [4] to quickly optimize design multistage depressed collectors, which greatly enhances software's capabilities. addition to, method can be extended simulation other modules, lays a solid foundation for subsequent development intelligent regulating system traveling wave tube based on automatic test electrical parameters.

A novel 3-D finite-element modeling technique without matching meshes for the eigenvalue analysis of arbitrary lossy slow-wave structures (SWSs) traveling-wave tubes is presented. By simulating two examples, it shown that cold parameters SWSs can be accurately and quickly obtained when using this technique. Moreover, a new second-order transverse electric periodic boundary condition (PBC) proposed to improve efficiency in nonmatching case, very suitable application rotated PBC. This would...

Steady state thermal-structural analysis of electron guns is essential due to the requirement high reliability in beam performance. Temperatures and displacements for all components an gun with a control grid are computed. Steady-state thermal has been carried out various cathode temperatures intercepted powers on determine temperature grid. These results verified experimentally based measured from assembled gun. Structural used evaluate deformation inner electrodes under hot condition. The...

This paper presents a three-dimensional time-dependent nonlinear theory of helix traveling wave tubes for beam-wave interaction. The radio frequency electromagnetic fields are represented as the superposition azimuthally symmetric waves in vacuum sheath helix. Coupling impedance is introduced to field equations' stimulating sources, which makes easier and more flexible realize. space charge calculated by electron beam space-charge expressed solutions Helmholtz equations. focusing forces due...

The advances to EOS is introduced. In 2D, the Gauss-Legendre integral formula newly adopted improve electric field calculation accuracy. self- magnetic technique used for modeling high-current relativistic electron beam. adaptive mesh has been employed obtain specified accuracy automatically. multi-frontal incomplete cholesky conjugate gradient method applied reduce computation time and save computer memory consumption.

Microwave tube simulator suite (MTSS) is a fully featured software package for microwave analysis and design. it consists of four modules now, design environment (MTDE), electron optics (EOS), high frequency circuit (HFCS), beam-wave interaction (BWIS).

Atomic force microscope‐(AFM‐) based indentation tests were performed to examine mechanical properties of parallel single‐crystal silicon nanolines (SiNLs) sub‐100‐nm line width, fabricated by a process combining electron‐beam lithography and anisotropic wet etching. The SiNLs have straight nearly atomically flat sidewalls, the cross section is almost perfectly rectangular with uniform width height along longitudinal direction. measured load‐displacement curves from show an instability large...

In this paper, the interaction between terahertz wave and a non-uniform magnetized plasma slab is investigated. The electric field distribution in presented used to calculate attenuation of electromagnetic through plasma. Several types electron density profiles are proposed discussed. Effects different parameters (electron density, collision frequency, thickness) magnetic amplitudes on THz characteristic transmission ratios at several typical signal frequencies both unmagnetized as well....

In slow wave structures (SWSs) for helix traveling-wave tubes, both thermal conductivities (TCs) of materials and contact resistances (TCRs) are temperature-dependent, which have a great influence on the heat dissipation SWSs. This article presents an accurate efficient analysis method SWSs by finite-element (FEM). this method, novel boundary condition (CBC) approach is proposed. CBC can easily integrate various TCR models to simulate temperature-dependent TCRs accurately conveniently....

A novel multifrontal block incomplete LU preconditioner (MFBILU) for large-scale complex unsymmetric linear generalized eigenvalue problems (GEPs), which are formed by the 3D finite-element (FE) analysis of lossy slow-wave structures (SWSs) traveling-wave tubes (TWTs). We organized it with p-type multigrid (PMP) and obtained a mixed high efficient preconditioner. By simulating many practical SWSs new preconditioner, was shown that high-frequency parameters can be rapidly accurately low...

A high power C-band monolithic voltage controlled oscillator (VCO) based on AlGaN/GaN HEMT is presented. The design utilizes a common-gate negative resistance structure, and device acted as varactor used to control the VCO's oscillation frequency. VCO operating at 20V drain bias -3V gate exhibits an output of 26 dBm center frequency 5.96 GHz with dc-to-RF efficiency 30%. Phase noise estimated be -96 dBc/Hz 500 KHz offset. With varactor's from -1.5 V -16 V, tuning range 5.61 6.38 GHz....