An electro-magnetic trap for cooling multi-charged ions (MCIs) with cold positrons has been designed and is now under construction. A 5-tesla superconducting solenoid in which the trap will be installed has been constructed and installed in the experimental hall. The cooling scheme of MCIs is as follows: 1) loading electrons in the trap on which an electric harmonic potential is applied, 2) coo...

Combined neutral beam injection and fast wave heating at the fourth and fifth cyclotron harmonics accelerate fast ions in the DIII-D tokamak. Measurements with a nine-channel fast-ion D-alpha (FIDA) diagnostic indicate the formation of a fast-ion tail above the injection energy. Tail formation correlates with enhancement of the d–d neutron rate above the value that is expected in the absence of...

a direct conversion modulator-demodulator with even harmonic mixers with emphasis on noise analysis is presented. the circuits consist of even harmonic mixers (ehms) realized with antiparallel diode pairs (apdps). we evaluate the different levels of i/q imbalances and dc offsets and use signal space concepts to analyze the bit error rate (ber) of the proposed transceiver using m-ary qam schemes...

This paper presents a fast-hopping frequency synthesizer architecture with quadrature outputs, based on subharmonic injection-locking, that is compliant with WirelessUSB/WiMedia specifications. The synthesizer features a crosscoupled quadrature digitally-controlled oscillator, that is injection locked to a sub-harmonic frequency. On-chip mixers have been implemented to measure the quadrature ac...

The harmonic in distribution systems becomes an important problem due to an increase in nonlinear loads. This paper presents a new approach based on a graph algorithm for optimum placement of passive harmonic filters in a multi-bus system, which suffers from harmonic current sources. The objective of this paper is to minimize the network loss, the cost of the filter and the total harmonic disto...

A sub-harmonic injection-locked tripler multiplies a 20-GHz differential input to 60-GHz quadrature (I/Q) output signals. The tripler consists of a two-stage ring oscillator driven by a single-stage polyphase input filter and 50I and Q-signal output buffers. Each gain stage incorporates a hard limiter to triple the input frequency for injection locking and a negative resistance cell with two po...

The main design goals for beam injection are explained and special problems related to a central region with internal ion source are considered. The principle of a PIG source is addressed. The issue of vertical focusing in the cyclotron centre is briefly discussed. Several examples of numerical simulations are given. Different ways of (axial) injection are briefly outlined. A proposal for a mag...

Among various maximum torque per ampere (MTPA) control schemes for interior permanent magnet synchronous motor (IPMSM) drives, the signal-injection-based methods exhibit relatively high overall performance due to their accuracy and satisfactory dynamic performance. However, current spectrum peaks induced by fixed-frequency signal injection may cause electromagnetic interference even audible noi...

This paper presents new and efficient modulation techniques applied on the recently introduced compact nine-level switched-capacitor inverter (C9LSCI). The also discusses performance of under selective harmonic elimination (SHE) mitigation (SHM) based heuristic Bat-Algorithm (BA) technique. Two employing CD-type carrier waves M-type are proposed, showing a rise in efficiency, an increase RMS vo...

In this paper, load current balancing are reviewed in both three-wire and 4-wire systems taking into account linearity, harmonics injection, control schemes. A linearized static compensator (STATCOM) based on H-bridge voltage source inverter (VSI). The proposed STATCOM is controlled closed loop mode via equipping it with a new controller. DC capacitor of the kept constant without using external...