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Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Electrogravimetric Analysis: Overview01:30

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Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
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Related Experiment Video

Updated: Jun 27, 2026

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
09:36

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

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Diagnostics for the biased electrode experiment on NSTX.

A L Roquemore1, S J Zweben, R Kaita

  • 1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary

A new electrode array in NSTX plasma experiments aims to control the scrape-off layer width by generating a localized electric field. Initial results show effects on local plasma parameters, paving the way for improved fusion energy control.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Magnetic confinement fusion

Background:

  • The scrape-off layer (SOL) width is a critical parameter in magnetic confinement fusion devices like NSTX.
  • Controlling the SOL width is essential for optimizing plasma performance and device longevity.
  • Previous methods for SOL width control have limitations.

Purpose of the Study:

  • To investigate the efficacy of a novel linear electrode array for controlling the scrape-off layer width in NSTX.
  • To create a strong local poloidal electric field using biased electrodes to influence plasma behavior.
  • To analyze the impact of localized electrode biasing on plasma parameters.

Main Methods:

  • Installation of a linear array of four independently biased electrodes (±100 V, limited current) in NSTX.
  • Utilizing Langmuir probes and gas puff imaging diagnostics to measure plasma parameters.
  • Employing fast cameras for direct observation of the electrode array and plasma interactions.
  • Detailed presentation of hardware, controls, and experimental setup.

Main Results:

  • Demonstration of the experimental setup for localized plasma control.
  • Initial measurements indicate localized electric field generation by the electrode array.
  • Observed effects on local plasma parameters, providing insights into SOL width modulation.

Conclusions:

  • The installed electrode array provides a new tool for localized plasma control in NSTX.
  • Localized electric fields show potential for influencing scrape-off layer dynamics.
  • Further analysis is needed to fully understand and optimize the SOL width control capabilities.