Development of compact nanosecond pulsed X-ray source

Li, M.J.; Chen, D.Y.; Zhou, Lin; Liang, Chaojie; You, Hui

doi:10.1017/s0263034617000155

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…Therefore, the metal foils with low atomic weight, such as beryllium (Be), aluminum (Al), titanium (Ti) are usually used in these accelerators [15]. For x-ray bremsstrahlung sources, anode foils made of a metal having a large atomic number are used, because the anode material determines the efficiency of this radiation [23][24][25]. Furthermore, the condition of the anode material also affects the breakdown voltage in vacuum diodes.…”

Section: Introductionmentioning

confidence: 99%

Effect of cathode and anode materials on the high-energy electron beam in the nanosecond-pulse breakdown in gas-filled diodes

Zhang¹,

Huang²,

Ding³

et al. 2019

J. Phys. D: Appl. Phys.

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High-energy electron beam can be generated during the breakdown process in a gas diode at elevated pressures. The design of electrodes in the gas diode affects the parameters of these electron beams. In this paper, investigation on parameters of the runaway electron beam (REB) in air and nitrogen excited by nanosecond pulsed generators are presented. Experiments were carried out with gas diodes by using cathode and anode made of different materials, including stainless steel, aluminum, copper and titanium. Experimental results show that, in the case of nanosecond-pulse breakdown, the cathode material significantly affects the amplitude of the REB current pulse when either pressure or gap spacing are small. When the pressure is low, the REB current is highest for the stainless steel cathode due to its small electron work function. However, the REB current for the aluminum, copper and titanium cathodes is higher than that of stainless steel cathode at atmospheric pressure because of the Malter effect on their surfaces. The dependence of the amplitude of the REB current on the anode foils is investigated by using aluminum, titanium, copper and tantalum. The experimental results show that the atomic number of the metal, as well as mass mean free path of the electron in it contribute to the amplitude of the REB current pulse. Based on the REB currents of different anode foils, energy distribution of runaway electrons is estimated. Electron distribution with an average energy of ~55 keV is obtained when the amplitude of the applied voltage pulse across the discharge gap is 110 kV. The results may contribute to the design of the gas diode for the generation of high-energy electron beams in nanosecond-pulse breakdown.

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Section: Introductionmentioning

confidence: 99%

Effect of cathode and anode materials on the high-energy electron beam in the nanosecond-pulse breakdown in gas-filled diodes

Zhang¹,

Huang²,

Ding³

et al. 2019

J. Phys. D: Appl. Phys.

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“…However, the beam quality and diffraction efficiency after diffraction of the bulk Bragg grating significantly deteriorates with the increase of the diffracted beams' spectral width. [15] Recently, a refraction displacement pulse sequence combining apparatus was reported by Xu et al, achieving the combined output power of 1395 W, the diffraction limited times 𝛽 of 7.6 and combining efficiency of 98.4%. However, it is mostly limited by the complexity of structure.…”

mentioning

confidence: 99%

High Power Pulse Laser Reflection Sequence Combination with a Fast Steering Mirror*

Gong¹,

Xu²,

Zhang³

et al. 2019

Chinese Phys. Lett.

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We propose and demonstrate a new approach for a high power pulse laser reflection sequence combination with a fast steering mirror (FSM). This approach possesses significant advantages for lasers combining with a variety of output power, wavelength, pulse duration, repetition rates and polarization. The maximum number of laser routes participating in combination principally depends on the FSM’s adjustment time of the step response, lasers’ repetition rates and pulse duration. A proof-of-principle experiment is performed with two 2-kW level pulsed beams. The results indicate that the combined beam has an excellent pointing stability with rms pointing jitter ∼8.5 μrad. Meanwhile, a high combining efficiency of 98.6% is achieved with maintaining good beam quality.

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Development of compact nanosecond pulsed X-ray source

Cited by 2 publications

References 14 publications

Effect of cathode and anode materials on the high-energy electron beam in the nanosecond-pulse breakdown in gas-filled diodes

Effect of cathode and anode materials on the high-energy electron beam in the nanosecond-pulse breakdown in gas-filled diodes

High Power Pulse Laser Reflection Sequence Combination with a Fast Steering Mirror*

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