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Impedance Characteristics of Pulsed Atmospheric Electrical Discharge in Spherical Plasma Switch
خصائص ممانعة تفريغ كهربائي نبضي في مفتاح بلازما كروي تحت الضغط الجوي الاعتيادي

Authors: Abdalhasen A. Khdayeir عبد الحسين عباس خضير --- Ala’ F. Ahmed آلاء فاضل احمد الراشدي --- Abdulretha S. Hasaani عبد الرضا سلمان حساني
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2011 Volume: 8 Issue: 2عدد خاص بمؤتمر الفيزياء Pages: 630-637
Publisher: Baghdad University جامعة بغداد

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Abstract

A number of pulsed experiments have been carried out using a high-voltage circuit containing R,L, and C in certain arrangements. A spherical spark gap of steel electrodes was used as a high-current switch operated by a voltage of up to 8kV and triggered in both self-triggering and third-electrode triggering modes.Current measurements were carried out by using both current-viewing resistor and Rogowski coils designed for this purpose. Typical current waveforms have shown obvious dominating inductance effect of the circuit components in an underdamped oscillation. The behavior of the circuit impedance was studied by recording both pulsed current peaks and the charging voltages when currents of up to 2.5kA were recorded. The duration of these current pulses were found to extend between 0.1μs and 0.3μs depending on the values of the circuit components as well as the spacing of the spark gap electrodes along which the plasma propagates at atmospheric pressure. Over the whole range of experimental conditions, the average nominal impedance values were ranged between (2-10)Ω depending on the gap and circuit parameters. Typical damage patterns were observed with average diameters of up to 8.3 mm on the high voltage electrode and 10.5 mm on the grounded sphere resulting from accumulative discharges and power dissipation within the gap.

أستخدمت دائرة فولتية نبضية عالية تحتوي على مقاومة ومتسعة ومحاثة لاجراء تجارب تفريغ كهربائي في مفتاح بلازما كروي الشكل وصلت فولتية الشحن فيها الى8kV . أستخدمت مقاومة مجزئ وملفات روغوفسكي لقياس تيار التفريغ النبضي عند قدح مفتاح البلازما بنمطين كهربائي والكتروني حيث وصلت قيمة الذروة للتيار الى 2.5kA و زمن النبضة تراوحت بين0.1μs و .0.3μs اوجدت التجارب وجود سلوك حثي سائد في الدائرة معتمدا على قيمة مكونات الدائرة وسلوك البلازما المنتقلة بين قطبي فجوة المفتاح وانعكاس ذلك على ممانعة الدائرة النبضية . وبسبب التفريغات الكهربائية المتراكمة وتفاعل الطاقة مع سطح القطبين لوحظ وجود اثار للتفريغ الكهربائي وصلت اقطاره 8.3mm على قطب الفولتية العالية و 10.5mmعلى قطب مفتاح البلازما الموصول بالارضي .تحت جميع الضروف التجريبية المعطاة وجد ان قيمة الممانعة تتراوح بين 2 اوم و10 اوم معتمدة على ضروف التذبذب وطريقة تحليل نتائج اشارات تيارالتفريغ الكهربائي.


Article
DESIGN AND CONSTRUCTION OF LASER'S SPARK GAP

Author: Dr. Basem Alaibei Shwya Mustansiriyah University
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467(print) 27068536(online) Year: 2017 Volume: 23 Issue: 97/علمي Pages: 13-20
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

DESIGN AND CONSTRUCTIONOF LASER'S SPARK GAPDr. Basem Alaibei ShwyaMustansiriyah UniversityABSTRACT:-The spark gap is simply a high voltage , high speed switch for firing the laser,there are a number of applications in both civilian and military markets where CO2 lasers can be used to advantage over other coherent light source .In all of the following applications the laser is used in a pulsed mode and the influence of triggered spark gap has been found to be a most useful device for achieving this operation . The two - electrode spark gap is designed to drive pulse laser and transmission mode systems by means of switching high voltage up to 30 KV at a repetition rate as high as 100 Hz . The device has been operated for several months , firing in a variety of applications without any electrode failure .

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