الانتقال الى المحتوى الأساسي

جامعة الملك عبدالعزيز

KING ABDULAZIZ UNIVERSITY

كلية الدراسات التطبيقية

تفاصيل الوثيقة

نوع الوثيقة : بحث مدعم 
عنوان الوثيقة :
تدفئة مستقلة أنبوب ليزر والتحول المغناطيسي ليزر بخار النحاس
Independent laser tube heating and magnetic switching for Copper Vapor Lasers
 
الموضوع : الفيزياء والعلوم الرياضية 
لغة الوثيقة : الانجليزية 
المستخلص : This thesis presents two innovative techniques to overcome limitations of the existing self-heated copper vapor laser (CVLs)- namely interdependence of the heating and pumping parameters, and the lifetime of the switching device. An independent discharge heating method has been investigated extensively as a solution to the first limitation. For the second limitation, extensive theoretical and experimental studies have been conducted on the use of magnetic pulse compressor (MPC) in the CVL circuit. In the heating part, it has been found that a.c. discharge heating is ideally for decoupling the excitation and heating parameters. In this study, detailed circuit design for a.c. discharge heating has been presented. With this system, it was possible to study various laser parameters at low pulse repetition rate. Both theoretically and experimentally, it has been found that the main condition for laser operation in this scheme is that excitation must take place where there is no heating voltage and current. This condition can be conveniently fulfilled by applying excitation pulses at the zero crossings of the a.c. heating voltage. Based o this results, a new class of CVLs capable of operating from single shot to high repetition rate is proposed. The general strategy for MPC design according to the switching speed is discussed. Both losses in the magnetic switch core and winding have been studied extensively theoretically and experimentally. In order to assess the suitability of magnetic materials, a new technique of core loss measurement has been developed and a new figure of merit has been introduced. The problem of the global eddy current in the core is studied. For the complexity of this problem, particularly at high switching frequency, a model is presented to understand the eddy current loss in composite material cores. The effects of core size and bulk resistivity on the eddy current loss in the core are studied. A practical result from this study has been deduced to use segmented core instead of one block core in the MPC. The ultimate results of this study have led to development of a new design of ferrite cored MPC for high average power system. 
سنة النشر : 1414 هـ
1993 م
 
عدد الصفحات : 188 
سنة الدعم : 1414 هـ
1993 م
 
تاريخ الاضافة على الموقع : Saturday, July 31, 2010 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
عدنان راشدRashed, Adnan  دكتوراه 

الملفات

اسم الملفالنوعالوصف
 27518.docx docx 

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