汪治平 博士 (原子物理與光學組)
最新研究成果
By focusing conventional 1-TW 40-fs laser pulses into a dense 450-um-long nitrogen gas cell, we demonstrate the feasibility of routinely generating electron beams from laser wakefield acceleration (LWFA) with primary energies scaling up to 10 MeV and a high charge in excess of 50 pC. When electron beams are generated with a charge of ~30 pC and a beam divergence of 40 mrad from the nitrogen cell having a peak atom density of 7.6*10^18/cm3, increasing the density inside the cell by 25%—controlled by tuning the backing pressure of fed nitrogen gas—can induce defocusing of the pump pulse that leads to a twofold increase in the output charge but with a trade-off in beam divergence. Therefore, this LWFA scheme has two preferred regimes for acquiring electron beams with either lower divergence or higher beam
charge depending on a slight variation of the gas/plasma density inside the cell. Our results identify the high potential for implementing submillimeter nitrogen gas cells in the future development of high-repetition-rate LWFA driven by sub-TW or few-TW laser pulses.
charge depending on a slight variation of the gas/plasma density inside the cell. Our results identify the high potential for implementing submillimeter nitrogen gas cells in the future development of high-repetition-rate LWFA driven by sub-TW or few-TW laser pulses.
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最後更新於 2024-04-22 22:44:49
地址: 106319 台北市羅斯福路四段一號 或 106923 臺北臺大郵局 第23-166號信箱
電話:886-2-2362-0212 傳真:886-2-2362-0200 電子郵件:iamspublic@gate.sinica.edu.tw
最後更新於 2024-04-22 22:44:49