注意：一种基于最小密封型等离子体聚焦装置的便携式脉冲中子源。

Note: A portable pulsed neutron source based on the smallest sealed-type plasma focus device.

作者信息

Niranjan Ram, Rout R K, Mishra Prabhat, Srivastava Rohit, Rawool A M, Kaushik T C, Gupta Satish C

机构信息

Applied Physics Division, Bhabha Atomic Research Centre, Mumbai, India.

出版信息

Rev Sci Instrum. 2011 Feb;82(2):026104. doi: 10.1063/1.3534827.

DOI:10.1063/1.3534827

PMID:21361643

Abstract

Development and operation of a portable and compact pulsed neutron source based on sealed-type plasma focus (PF) device are reported. The unit is the smallest sealed-type neutron producing PF device. The effective volume of the PF unit is 33 cm(3) only. A compact size single capacitor (4 μF) is used as the energy driver. A battery based power supply unit is used for charging the capacitor and triggering the spark gap. The PF unit is operated at 10 kV (200 J) and at a deuterium gas filling pressure of 8 mb. The device is operated over a time span of 200 days and the neutron emissions have been observed for 200 shots without changing the gas in between the shots. The maximum yield of this device is 7.8 × 10(4) neutrons/pulse. Beyond 200 shots the yield is below the threshold (1050 neutrons/pulse) of our (3)He detector. The neutron energy is evaluated using time of flight technique and the value is (2.49 ± 0.27) MeV. The measured neutron pulse width is (24 ± 5) ns. Multishot and long duration operations envisage the potentiality of such portable device for repetitive mode of operation.

摘要

报道了一种基于密封型等离子体聚焦（PF）装置的便携式紧凑型脉冲中子源的研制与运行情况。该装置是最小的密封型中子产生PF装置。PF装置的有效体积仅为33立方厘米。采用一个紧凑型单电容（4微法）作为能量驱动器。使用基于电池的电源装置对电容充电并触发火花隙。PF装置在10千伏（200焦耳）的电压和8毫巴的氘气填充压力下运行。该装置运行了200天，在200次发射过程中未更换气体的情况下观测到了中子发射。该装置的最大产额为7.8×10⁴个中子/脉冲。超过200次发射后，产额低于我们的³He探测器的阈值（1050个中子/脉冲）。利用飞行时间技术评估中子能量，其值为（2.49±0.27）兆电子伏。测得的中子脉冲宽度为（24±5）纳秒。多次发射和长时间运行表明这种便携式装置具有重复运行模式的潜力。