We present results from a proof-of-principle experiment to optimize energy spectrum of laser driven protons by directly feeding back its spectral information to a deformable mirror (DM) controlled by evolutionary algorithms (EAs). By irradiating a stable high-repetition rate tape driven target with ultra-intense pulses of ∼1020 W/cm2, we optimize the maximum energy of the accelerated protons with a stability of less than ∼5% fluctuations near optimum value. Moreover, due to spatio-temporal development of the sheath field, modulations in the spectrum are also observed. Particularly, a prominent narrow peak is observed with a spread of ∼15% (FWHM) at low energy part of the spectrum. These results are helpful to develop high repetition rate optimization techniques required for future laser-driven ion accelerators.
|Journal||Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|Early online date||24 Nov 2017|
|Publication status||Early online date - 24 Nov 2017|
Noaman-ul-Haq, M., Sokollik, T., Ahmed, H., Braenzel, J., Ehrentraut, L., Mirzaie, M., Yu, L. -L., Sheng, Z. M., Chen, L., Schnurer, M., & Zhang, J. (2017). Controlling laser driven protons acceleration using a deformable mirror at a high repetition rate. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. https://doi.org/10.1016/j.nima.2017.11.075