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Automated Delivery of Microfabricated Targets for Intense Laser Irradiation Experiments

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High-resolution Thomson parabola for ion analysis.

J A Cobble¹, K A Flippo, D T Offermann

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

The Review of Scientific Instruments

|December 2, 2011

Summary

This summary is machine-generated.

A new Thomson parabola ion energy analyzer was developed for OMEGA-EP, enabling precise measurement of laser-accelerated ions. This device achieved high-resolution energy analysis, exceeding 5% laser-to-ion conversion efficiency.

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Area of Science:

Plasma Physics
Nuclear Fusion
Particle Accelerators

Background:

High-energy ion diagnostics are crucial for inertial confinement fusion research.
Existing methods often lack the resolution or versatility required for complex laser-plasma interactions.

Purpose of the Study:

To design, construct, and validate a versatile Thomson parabola ion energy analyzer for the OMEGA-EP facility.
To characterize laser-accelerated ions from hemispherical carbon targets.
To assess the efficiency of laser energy conversion into energetic ions.

Main Methods:

Utilized a Thomson parabola ion energy analyzer with adjustable drift lengths (10, 50, 80 cm) and electric/magnetic fields.
Employed CR39 detectors backed by image plates for ion detection.
Developed and applied a fully relativistic simulation code for trajectory calculations and design optimization.
Analyzed ion tracks using pit counting on CR39 detectors.

Main Results:

Successfully resolved 400-MeV C(6+) and C(5+) ions, demonstrating high-resolution energy analysis.
Observed excellent agreement between simulation predictions and experimental ion positions.
Measured laser-to-energetic carbon ion conversion efficiencies exceeding 5% for hemispherical carbon targets.

Conclusions:

The developed Thomson parabola ion energy analyzer is a versatile and effective diagnostic for OMEGA-EP.
The instrument provides high-resolution energy spectra of laser-accelerated ions.
The study demonstrates significant laser-to-ion conversion efficiency in the investigated targets.