研究目的
Investigating the aberration in active plasma lenses caused by a radially nonuniform plasma temperature profile and demonstrating its suppression by changing the gas species from helium to argon, thereby preserving the emittance of an electron beam.
研究成果
The study successfully demonstrated that changing from a light gas species (helium) to a heavier gas species (argon) in active plasma lenses can fully suppress aberrations caused by nonuniform plasma temperature profiles, thereby preserving the emittance of the focused electron beam. This development is a critical step towards compact, low-emittance accelerators.
研究不足
The study is limited by the need for low beam charge to avoid plasma wakefield distortion, which may restrict the application to high-intensity beams. Additionally, the use of heavier gas species like argon increases scattering, potentially affecting beam quality at higher pressures.
1：Experimental Design and Method Selection:
The experiment involved measuring the radial magnetic field distribution in an active plasma lens (APL) using a tightly focused electron beam and observing the angular deflections caused by the lens. The setup included a gas-filled sapphire capillary connected to a Marx generator for discharging, and a two-axis mover for precise positioning.
2：Sample Selection and Data Sources:
The experiment used electron beams with specific energies and charges, focused into the APL. The magnetic field distribution was measured by displacing the lens across the beam and observing the deflections on an OTR screen.
3：List of Experimental Equipment and Materials:
The setup included a 1 mm diameter and 15 mm long sapphire capillary, a Marx generator for high-voltage pulses, current pulse transformers, a two-axis mover with 1 μm step resolution, and OTR screens for beam observation.
4：Experimental Procedures and Operational Workflow:
The beam was focused into the APL, and the lens was displaced across the beam to measure the magnetic field distribution. The emittance was measured using quadrupole scans with and without the APL discharge.
5：Data Analysis Methods:
The magnetic field distribution was analyzed by integrating Ampère's law for a longitudinal current density. Emittance measurements were performed using quadrupole scans and analyzed to determine the beam quality preservation.
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