Demonstration of Microwave Generation from a Static Field by a Relativistic Ionization Front in a Capacitor Array

Lai, Chun‐Hung; Liou, R.; Katsouleas, T.; Muggli, P.; Brogle, R.; Joshi, C.; Mori, W. B.

doi:10.1103/physrevlett.77.4764

Cited by 52 publications

(26 citation statements)

References 7 publications

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“…This electromagnetic wave radiation source is called "DARC (DC to AC radiation converter)". [10][11][12] The DARC has the following advantages, (i) frequency tunability, (ii) ultrashort pulse and (iii) high power. We have successfully observed electromagnetic wave generation in the microwave regime by using a Q-switched CO 2 laser.…”

mentioning

confidence: 99%

Emission of Short Microwave Pulse Radiated by Interaction between Periodic Static Electric Field and Relativistic Ionization Front

Higashiguchi¹,

Yugami²,

Okabe³

et al. 1999

Jpn. J. Appl. Phys.

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Experimental results on "DARC (DC to AC radiation converter)" using 4ω 0 light of a Nd:YAG laser with a pulse duration of ∼ 6 ns are reported. Electromagnetic wave generation has been observed in the interaction experiments between a static electric field and a relativistic ionization front. The frequency of the emitted microwave pulse (∼ 6 ns) ranges from 9.5 GHz to 14.1 GHz. The output signal intensity is proportional to the DC bias voltage with a power of 2.3. The emitted radiation field is polarized along the static electric field direction. The pulse duration of the emitted radiation is as long as that of the ionizing laser. This indicates that the pulse duration strongly depends on the ionization process by the laser light.

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mentioning

confidence: 99%

Emission of Short Microwave Pulse Radiated by Interaction between Periodic Static Electric Field and Relativistic Ionization Front

Higashiguchi¹,

Yugami²,

Okabe³

et al. 1999

Jpn. J. Appl. Phys.

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“…Lai et al reported that acute exposure to low intensity microwaves induced singlestrand breaks [Lai and Singh, 1995;Lai et al, 1996], and similar damage was observed in mice after prolonged exposure [Sarkar et al, 1994]. However, no DNA damage was found in a similar study with rats [Malyapa et al, 1998].…”

Section: Introductionmentioning

confidence: 88%

Chronic exposure to a 1.439 GHz electromagnetic field used for cellular phones does not promote N‐ethylnitrosourea induced central nervous system tumors in F344 rats

Shirai

Kawabe²,

Ichihara³

et al. 2004

Bioelectromagnetics

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The present study was designed to evaluate whether a 2 year exposure to an electromagnetic field (EMF) equivalent to that generated by cellular phones can accelerate tumor development in the central nervous system (CNS) of rats. Brain tumorigenesis was initiated by an intrauterine exposure to N-ethylnitrosourea (ENU) on gestational day 18. A total of 500 pups were divided into five groups, each composed of 50 males and 50 females: Group 1, untreated control; Group 2, ENU alone; Groups 3-5, ENU + EMF (sham exposure and 2 exposure levels). A 1.439 GHz time division multiple access (TDMA) signal for the Personal Digital Cellular (PDC), Japanese standard cellular system was used for the exposure of the rat head starting from 5 weeks of age, 90 min a day, 5 days a week, for 104 weeks. Brain average specific absorption rate (SAR) was 0.67 and 2.0 W/kg for low and high exposures, respectively: whole body average SAR was less than 0.4 W/kg. There were no inter-group differences in body weights, food consumption, and survival rates. No increase in the incidences or numbers per group of brain and/or spinal cord tumors, either in the males or females, was detected in the EMF exposed groups. In addition, no clear changes in tumor types were evident. Thus, under the present experimental conditions, 1.439 GHz EMF exposure to the heads of rats for a 2 year period was not demonstrated to accelerate or affect ENU initiated brain tumorigenesis.

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“…An excellent example of this is the recent development of the dc-to-rf Radiation Converter ͑DARC͒ source. 25,26 This source uses an alternating array of dc biased plates in a waveguide and a fast moving ionization front created by a laser pulse to generate short pulses of high frequency radiation. A schematic of the original DARC source is shown in Fig.…”

Section: B Microwave Sources Designed To Use Plasmamentioning

confidence: 99%

Advances in plasma-filled microwave sources

1999

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Significant improvements in the performance of microwave sources have been achieved in recent years by the introduction of the appropriate amount of plasma into tubes designed to accommodate plasma. Plasma filling has been credited with increasing the electron beam current, bandwidth, efficiency and reducing or eliminating the need for guiding magnetic fields in microwave sources. Neutralization of the e-beam space charge by a plasma enhances the current capability and beam propagation, and the generation of hybrid waves in plasma-filled sources increases the electric field on axis and improves the coupling and efficiency. Control of the plasma density in these microwave sources is often required to avoid instabilities and variations in the output power level and pulse length. Recent experimental and theoretical advances in this field, and the benefits and limitations of plasma filling of several different types of microwave sources, will be discussed.

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Demonstration of Microwave Generation from a Static Field by a Relativistic Ionization Front in a Capacitor Array

Cited by 52 publications

References 7 publications

Emission of Short Microwave Pulse Radiated by Interaction between Periodic Static Electric Field and Relativistic Ionization Front

Emission of Short Microwave Pulse Radiated by Interaction between Periodic Static Electric Field and Relativistic Ionization Front

Chronic exposure to a 1.439 GHz electromagnetic field used for cellular phones does not promote N‐ethylnitrosourea induced central nervous system tumors in F344 rats

Advances in plasma-filled microwave sources

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