Output of triple-pulse megahertz burst rate high-voltage induction device

Sifu, Chen; Li, Xin; Ziping, Huang; Xiaobing, Jing; Ding, Hu; Wang, Lei; Yang, Xiaoguang; Wang, Minhong; Ma, Bing; Shi, Jinshui; Zhang, Linwen; Ding, Bonan; Deng, Jianjun

doi:10.1063/1.2213183

Cited by 5 publications

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“…The triple-pulser of the Dragon-II LIA consists of three square-pulse sections, a confluent/blocking network, and a control/triggering modular unit. [13,14] The pulser has been designed for load-matching, which helps to reduce the reflections of the pulses but still cannot completely eliminate the effect. The reflection of the former voltage pulse(s) will add on the latter one(s).…”

Section: Resultsmentioning

confidence: 99%

Energy-spread measurement of triple-pulse electron beams based on the magnetic dispersion principle

Wang

Yang

et al. 2017

NUCL SCI TECH

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Abstract:The energy-spread of the triple-pulse electron beam generated by the Dragon-II linear induction accelerator is measured using the method of energy dispersion in the magnetic field. A sector magnet is applied for energy analyzing of the electron beam, which has a bending radius of 300 mm and a deflection angle of 90 . For each pulse, both the time-resolved and the integral images of the electron position at the output port of the bending beam line are recorded by a streak camera and a CCD camera, respectively. Experimental results demonstrate an energy-spread of less than ±2.0% for the electron pulses. The cavity voltage waveforms obtained by different detectors are also analyzed for comparison. Key words: energy spread, linear induction accelerator, magnetic dispersion IntroductionThe linear induction accelerator (LIA) is able to generate charged particle beam pulses with extremely high currents, which has been well developed and widely applied in various fields since it was first proposed in 1950s, such as flash radiography [1], high power microwave generation [2] and heavy ion fusion [3,4]. In order to investigate the hydrodynamic process of high explosives, electron beam pulses are generated and accelerated to ~MeV energy in the LIA and finally focused onto a high-Z convertor to produce X-ray photons through the bremsstrahlung radiation [5]. The temporal width of the pulse is typically tens of nanoseconds, which is capable of recording an inner stopped-motion image of a dense object with a relatively small motion blur. In order to obtain fine details of the acquired image, it is strongly demanded to reduce the X-ray source to a spot size as small as possible, which is quoted as the evaluation of the resolving ability.For the ideal condition, the electron beam can be focused to an infinitesimally small spot, which is expected to generate a point X-ray source. However, the reduction of the X-ray spot size is limited by many factors, including the space charge effect, the spherical aberration of the lens, the beam emittance, the energy-spread, etc.[6] The effect of the electron energy spread on the spot size comes from two aspects. On the one hand, the minimal radius of the spot size determined by the dispersion aberration of the focusing lens is directly dependent on the energy-spread of the electron beam. [7] On the other hand, the energy spread of the electron beam will aggravate the Corkscrew oscillation induced by the titled beam injection, an inaccurate alignment of the solenoidal field, which finally gives rise to a bigger spot size and a larger spatial jitter.[8] The energy-spread of the electron beam is mainly determined by the waveform and the synchronization of the induction accelerating voltages as well as the load effect of the intense-current beam. [9] In this paper, the method based on magnetic dispersion is used to measure the energy-spread of triple-pulse electron beams produced by the Dragon-II LIA. Besides, the cavity voltage waveforms detected by both the capacitor voltage probe (CVP...

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Section: Resultsmentioning

confidence: 99%

Energy-spread measurement of triple-pulse electron beams based on the magnetic dispersion principle

Wang

Yang

et al. 2017

NUCL SCI TECH

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“…6(b) in Ref. [10] with 27 ferrite cores used. The amplitude of the voltage is about 250 kV for the metallic glass cores, and 180 kV for the NiZn ferrite cores.…”

Section: 1mentioning

confidence: 99%

“…Output of the high-voltage triple pulser at megahertz repetition rate [10,11] During a triple-pulse burst at 1.25 MHz, the voltage waveforms measured with the test cell are displayed in Fig. 7 with 20 metallic glass cores used and, in Fig.…”

Section: 1mentioning

confidence: 99%

“…One is a test cell (Fig. 5), which was designed to perform proof-of-principle experiments with ferrite cores [10]; the other is a formal linear induction cell used in the LIAXF [24]. The cell was disassembled to insert 14 metallic glass cores, which is shown in Fig.…”

Section: Induction Cell Designmentioning

confidence: 99%

“…Recently, technology demonstrations of key components have had considerable success in the engineering feasibility of the proposed scheme [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Design and characterization of a high-power induction module at megahertz repetition rate burst mode

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Ultrathin Shell Layers Dramatically Influence Polymer Nanoparticle Surface Mobility

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Advances in nanoparticle synthesis, self-assembly, and surface coating or patterning have enabled a diverse array of applications ranging from photonic and phononic crystal fabrication to drug delivery vehicles. One of the key obstacles restricting its potential is structural and thermal stability. The presence of a glass transition can facilitate deformation within nanoparticles, thus resulting in a significant alteration in structure and performance. Recently, we detected a glassy-state transition within individual polystyrene nanoparticles and related its origin to the presence of a surface layer with enhanced dynamics compared to the bulk. The presence of this mobile layer could have a dramatic impact on the thermal stability of polymer nanoparticles. Here, we demonstrate how the addition of a shell layer, as thin as a single polymer chain, atop the nanoparticles could completely eliminate any evidence of enhanced mobility at the surface of polystyrene nanoparticles. The ultrathin polymer shell layers were placed atop the nanoparticles via two approaches: (i) covalent bonding or (ii) electrostatic interactions. The temperature dependence of the particle vibrational spectrum, as recorded by Brillouin light scattering, was used to probe the surface mobility of nanoparticles with and without a shell layer. Beyond suppression of the surface mobility, the presence of the ultrathin polymer shell layers impacted the nanoparticle glass transition temperature and shear modulus, albeit to a lesser extent. The implication of this work is that the core–shell architecture allows for tailoring of the nanoparticle elasticity, surface softening, and glass transition temperature.

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Output of triple-pulse megahertz burst rate high-voltage induction device

Cited by 5 publications

References 0 publications

Energy-spread measurement of triple-pulse electron beams based on the magnetic dispersion principle

Energy-spread measurement of triple-pulse electron beams based on the magnetic dispersion principle

Design and characterization of a high-power induction module at megahertz repetition rate burst mode

Ultrathin Shell Layers Dramatically Influence Polymer Nanoparticle Surface Mobility

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