The system is based on ultrasonic multiple pulse - echo principle , the control circuit of sonic circulation , can improve the precision of measurement by extending the time of detection 本系統(tǒng)以超聲波多次脈沖反射法測距原理為基礎,設計聲循環(huán)反射控制電路,達到以延長測量時間為代價提高測量精度的目的。
We modified the electron trapping theory to be consistent with our simulation results . 2 . in the mp - lwfa simulation , we studied the influence of multiple pulses with various arrangements of the position of the pulses 在mp - lwfa中,我們研究不同的脈沖長度、不同的脈沖間隔對產(chǎn)生尾流場的影響,著重討論尾流場的飽和機制。
The wakefield excited by an ultrashort and ultrahigh laser pulse propagating through tenuous plasma can accelerate electrons to extreme high energy . this can be used as a mechanism to design minitype electron accelerator . this thesis is devoted to studying those issues relevant to the wakefield accelerator , namely the laser wakefield accelerator ( lwfa ) , laser wakefield accelerator driven by multiple pulses ( mp - lwfa ) , plasma beat wave accel - erator ( pbwa ) and self - modulated laser wakefield accelerator ( sm - lwfa ) 本文的目的是:利用粒子模擬方法,研究和比較激光尾流場加速電子的四種主要方案:短脈沖激光尾流場加速( lwfa ) 、多脈沖激光尾流場加速( mp - lwfa ) 、拍頻束尾流場加速( pbwa ) 、自調(diào)制激光尾流場加速( sm - lwfa ) 。
Secondly , we compared the similarities and differences of two multiple pulse schemes , namely " optimum pulse spacing " and " fixed pulse spacing " . it showed that the arrangement with both the spacing between pulses and the length of the single pulse increasing as the plasma wave becomes more nonlinear will drive wake wave effectively 接著我們比較“優(yōu)化脈沖間隔”和“固定脈沖間隔”兩種多脈沖尾流加速方案,得到:更合理的脈沖安排應該為:脈沖間隔不斷增大,脈沖長度也不斷增大。