서지주요정보
1GW 광분해 옥소 레이저를 이용한 연속 X-선의 발생 특성 = Continuum X-ray emission from the laser plasma produced by using 1GW iodine photodissociation laser
서명 / 저자 1GW 광분해 옥소 레이저를 이용한 연속 X-선의 발생 특성 = Continuum X-ray emission from the laser plasma produced by using 1GW iodine photodissociation laser / 김규욱.
저자명 김규욱 ; Kim, Gyu-Ug
발행사항 [서울 : 한국과학기술원, 1988].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4105221

소장위치/청구기호

학술문화관(문화관) 보존서고

DAP 8803

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A high power iodine photodissociation laser(IPL) amplifier system of 1GW is designed and developed. The amplifier system consists of an oscillator, two pre-amplifiers, and a main amplifier. The output characteristics of the amplifier system are examined with $TEM_00$ mode. The gas pressure of laser medium, $i-C_3F_7I$, of the oscillator, the first pre-amplifier, and the second pre-amplifier are fixed to 80, 100, and 60 torr, respectively. The maximum output energy of the main amplifier is measured to be 12.7J for the pressure of 40torr, and the operating voltage of 24kV. The conversion efficiency of stored electrical energy to laser energy is 0.26%. The pulse width of the main amplifier output is found to be 13.3ns for 50ns output pulse of the oscillator, and the maximum output power of the entire amplifier system is 0.96GW. The emission characteristics of the x-ray from the plasma produced by this 0.96GW IPL beam are investigated. The size of the plasma is measured to be 165, 199, 206, and 337㎛ for the focussing lenses with focal length f'=6, 10, 14, and 25cm, respectively. The relative intensity of the x-ray is more intense for the target with higher atomic number and for the lens with shorter focal length. The spectral intensity distribution of the x-ray from the laser plasma is examined by x-ray diffraction experiment using a convex curved mica (2d=19.84$À$) crystal spectrometer. For the Ti target and laser intensity of $2.87×10^12W/㎠$ the experiment gives the result that there is no significant line spectrum in continuous spectrum in continuous spectrum. The plasma electron temperature is determined by numerically fitting the theoretical curve to the normalized experimental data obtained from the exposed x-ray film. It is obtained as 0.57, 0.51, 0.49, 0.43, and 0.35keV for Al, Ti, Fe, Cu, and Mo target, respectively at the laser intensity of $2.87×10^12W/㎠$. The reflection of the laser beam backscattered from the plasma through the focussing lens is measured to be 4.7% for Al and 12.0% for Mo target. The FWHM of reflected laser pulse from the plasma is decreased by 1.5ns for Al and 4.5ns for Mo. For the purpose of comparison with laser plasma, the Mather type dense plasma focus(DPF) unit(50μF,20kV) is developed and its electrical characteristics are examined. The time delay before the DPF occurs is 5.85μs for the Ar gas pressure of 0.3torr and the capacitor charging voltage of 18kV, then the plasma sheath velocity is $4.27×10^6cm/s$.

서지기타정보

서지기타정보
청구기호 {DAP 8803
형태사항 iv, 121 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Gyu-Ug Kim
지도교수의 한글표기 : 이상수
지도교수의 영문표기 : Sang-Soo Lee
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 116-121
주제 Photodissociation.
Iodine lasers.
X-rays.
광 분해 (Pholysis/disintegration) --과학기술용어시소러스
레이저. --과학기술용어시소러스
요오드. --과학기술용어시소러스
X선 발생. --과학기술용어시소러스
레이저 플라스마. --과학기술용어시소러스
Laser plasma interactions.
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