Related Experiment Video
Updated: Jun 15, 2026
09:41
Emission Spectroscopic Boundary Layer Investigation during Ablative Material Testing in Plasmatron
Published on: June 9, 2016
Emittance studies of the Spallation Neutron Source external-antenna H- ion source
B X Han1, M P Stockli, R F Welton
1Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. hanb@ornl.gov
The Review of Scientific Instruments
|March 3, 2010
Summary
A new Allison-type emittance scanner characterizes H(-) beams from an external-antenna rf-driven ion source. This study details beam emittance, extraction parameters, and pulse duration effects for improved ion source and beam transport performance.
Area of Science:
- Particle accelerators
- Beam physics
- Ion source technology
Background:
- Characterizing ion beams is crucial for optimizing particle accelerator performance.
- Low energy beam transport systems require precise emittance measurements.
- The Spallation Neutron Source utilizes H(-) beams for its operations.
Purpose of the Study:
- To introduce and utilize a new Allison-type emittance scanner.
- To investigate the emittance characteristics of H(-) beams from a specific ion source.
- To analyze beam transport through a two-lens electrostatic system.
Main Methods:
- Construction and deployment of an Allison-type emittance scanner.
- Measurement of H(-) beam emittance.
- Systematic variation of beam intensity and extraction parameters.
- Analysis of emittance and Twiss parameters over beam pulse duration.
Main Results:
- The H(-) beam emittance was successfully measured.
- Dependence of beam emittance on intensity and extraction parameters was determined.
- Evolution of emittance and Twiss parameters throughout the beam pulse was documented.
Conclusions:
- The new emittance scanner effectively characterizes ion sources and low energy beam transport.
- Understanding emittance dependencies is key to optimizing H(-) beam quality.
- Detailed emittance analysis aids in the performance enhancement of the Spallation Neutron Source.
Related Concept Videos
01:22Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
01:29Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
01:20Atomic Emission Spectroscopy: Overview
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
01:19Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
01:30Atomic Emission Spectroscopy: Interference
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...