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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
RC Circuit with Source01:15

RC Circuit with Source

When a DC source is abruptly applied to an RC (Resistor-Capacitor) circuit, the voltage can be represented as a unit step function. The voltage across the capacitor, known as the step response, characterizes how the circuit reacts to this sudden change in input.
Due to the inherent properties of a capacitor, its voltage cannot change instantaneously. This means that immediately after the switch is closed, the capacitor's voltage remains the same as it was just before the switch was closed.
By...
Series RLC Circuit with Source01:12

Series RLC Circuit with Source

Consider the operation of an automobile ignition system, a crucial component responsible for generating a spark by producing high voltage from the battery. This system can be described as a simple series RLC circuit, allowing for an in-depth analysis of its complete response.
In this context, the input DC voltage serves as a forcing step function, resulting in a forced step response that mirrors the characteristics of the input. Applying Kirchhoff's voltage law to the circuit yields a...
Multiple Voltage Sources01:25

Multiple Voltage Sources

Generally, a single battery is not enough to power some devices. In such cases, batteries can be combined in two ways: in series or in parallel.
In series, the positive terminal of one battery is connected to the negative terminal of another battery. Hence, the voltage of each battery is added to give the net voltage, which is increased because each battery boosts the electrons that enter it. The same current flows through each battery because they are connected in series.
Batteries are...
RC Circuit without Source01:16

RC Circuit without Source

When a DC source is abruptly disconnected from an RC (Resistor-Capacitor) circuit, the circuit becomes source-free. Assuming that the capacitor was fully charged before the source was removed, its initial voltage, denoted as V0, can be considered as the initial energy that stimulates the circuit.
Applying Kirchhoff's current law at the top node of the circuit and substituting the current values across the components, a first-order differential equation is obtained. By rearranging the terms in...
Source Transformation for AC Circuits01:11

Source Transformation for AC Circuits

The process of source transformation in the frequency domain entails the conversion of a voltage source, positioned in series with an impedance, into a current source that is parallel to an impedance, or the other way around. It is essential to maintain the following relationships while transitioning from one source type to another.

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Related Experiment Video

Updated: Jun 15, 2026

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

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Published on: February 14, 2025

Experimental study for 15-20 mA dc H- multicusp source.

Tianjue Zhang1, Xianlu Jia, Yinlong Lv

  • 1China Institute of Atomic Energy, P.O. Box 275(3), Beijing 102413, People's Republic of China. tjzhang@ciae.ac.cn

The Review of Scientific Instruments
|March 3, 2010
PubMed
Summary
This summary is machine-generated.

A new negative hydrogen ion (H-) source achieved over 15 mA of H- beam for 36 hours with high stability. This advancement in ion source technology also demonstrated a normalized emittance of 0.48π mm mrad.

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Published on: May 9, 2019

Area of Science:

  • Accelerator Physics
  • Plasma Physics
  • Ion Source Technology

Background:

  • Leveraging experience from previous 10-15 mA H- ion sources and TRIUMF.
  • Addressing limitations in existing negative hydrogen ion source designs.

Purpose of the Study:

  • To develop and test a new, high-current negative hydrogen ion source.
  • To improve beam stability, emittance, and overall performance.

Main Methods:

  • Investigated virtual filter magnetic fields, confinement magnetic fields, and filament parameters.
  • Enhanced vacuum conditions in the extraction region and optimized extraction optics.
  • Implemented a new control and interlock system for power supplies.

Main Results:

  • Achieved over 15 mA of H- beam current sustained for 36 hours with ±0.5% stability.
  • Measured a normalized emittance of 0.48π mm mrad for an 8 mA DC beam.
  • Current experimental efforts aim to reach 20 mA with improved emittance.

Conclusions:

  • The new H- source demonstrates significant performance improvements over previous designs.
  • Optimized magnetic fields, vacuum, and extraction optics are key to high-current, stable H- beam production.
  • Future work includes exploring longer source bodies and cesium injection for enhanced emittance.