Broadband single-shot electron spectrometer for GeV-class laser-plasma-based accelerators.

Area of Science:

• Plasma Physics
• Accelerator Physics
• Particle Beam Diagnostics

Background:

• Laser-plasma-based accelerators (LPAs) offer broad electron energy ranges and large momentum spreads.
• Accurate control of laser and plasma parameters allows tailoring electron beam energy distributions.
• Measuring these distributions in a single shot necessitates diagnostics with high momentum acceptance and resolution.

Purpose of the Study:

• To develop and evaluate a broadband, single-shot electron magnetic spectrometer for GeV-class LPAs.
• To enable precise measurement of electron beam energies and properties in a single experimental run.

Main Methods:

• Design and construction of a broadband single-shot electron magnetic spectrometer.
• Utilizing a large pole gap for simultaneous measurement of laser properties.
• Employing measured field maps and third-order transport analysis for performance evaluation.

Main Results:

• The spectrometer successfully measured electron beam energies from 0.01 to 1.1 GeV in a single shot.
• Achieved a few percent-level resolution and accurate absolute energy determination across the entire energy range.
• Demonstrated suitability for characterizing broadband electron sources from LPAs.

Conclusions:

• The developed spectrometer is a capable diagnostic for GeV-class laser-plasma accelerators.
• It enables precise, single-shot measurement of broadband electron energy distributions.
• This tool advances the characterization and control of electron beams from advanced accelerators.