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The 2 PW/1 Hz laser system for laser-driven proton tumor therapy facility CLAPA-II: Compact laser plasma accelerator
Minjian Wu1,2, Hui Zhang1,2, Yixing Geng1,2
1State Key Laboratory of Nuclear Physics and Technology, and Key Laboratory of HEDP of the Ministry of Education, CAPT, Peking University, Beijing 100871, People's Republic of China.
The Review of Scientific Instruments
|May 1, 2026
Summary
The CLAPA-II laser system achieved 2.48 PW peak power with 71.9 J pulse energy. This high-power laser system is now operational for advanced laser acceleration experiments.
Area of Science:
- High-power laser physics
- Particle acceleration
Background:
- Laser-driven particle acceleration offers a novel approach for various applications.
- The CLAPA-II facility aims to advance laser technology for proton therapy and acceleration.
Purpose of the Study:
- To report the recent advancements and performance of the 2 PW/1 Hz laser system at CLAPA-II.
- To detail the system's capabilities for high-power laser-driven experiments.
Main Methods:
- Characterization of laser output parameters including energy, pulse width, and peak power.
- Evaluation of laser quality through contrast measurements (ps and ns).
- Assessment of laser stability via angular pointing fluctuation measurements.
Main Results:
- The system delivers a maximum single-pulse energy of 71.9 J with a 29 fs pulse width, reaching 2.48 PW peak power.
- Achieved laser quality: ps contrast > 10^12 and ns contrast = 2 × 10^10.
- Demonstrated high stability with angular pointing fluctuations of 1.04 μrad (horizontal) and 0.797 μrad (vertical) over 500 shots.
Conclusions:
- The 2 PW/1 Hz laser system at CLAPA-II has successfully met its performance targets.
- The system is deployed and ready for laser acceleration experiments, including potential applications in proton therapy.
