High intensity, plasma-induced electron emission from large area carbon nanotube array cathodes

Qingliang Liao; Ya Yang; Junjie Qi; Yue Zhang; Yunhua Huang; Liansheng Xia; Liang Liu
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p073109
Academic Journal
The plasma-induced electron emission properties of large area carbon nanotube (CNT) array cathodes under different pulse electric fields were investigated. The formation and expansion of cathode plasmas were proved; in addition, the cathodes have higher emission current in the double-pulse mode than that in the single-pulse mode due to the expansion of plasma. Under the double-pulse electric field of 8.16 V/μm, the plasma’s expansion velocity is about 12.33 cm/μs and the highest emission current density reached 107.72 A/cm2. The Cerenkov radiation was used to diagnose the distribution of electron beams, and the electron beams’ generating process was plasma-induced emission.


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