研究生: |
謝匡宇 Kuang-Yu Hsieh |
---|---|
論文名稱: |
研究雜訊準位為-90dBc的500MHz高頻轉換器 Exploring of a 500 MHz RF Transmitter with –90dBc Noise Level |
指導教授: |
朱國瑞
Kwo-Ray Chu 王兆恩 Choaen Wang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 60 |
中文關鍵詞: | 高頻 、共振腔 、超導共振腔 、速調管 、陰極電壓 、陽極電壓 、高頻濾波器 |
外文關鍵詞: | rf, cavity, rf superconductor cavity, klystron, cathod voltage, anode voltage, rf filter |
相關次數: | 點閱:4 下載:0 |
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同步輻射光的品質與儲存電子的穩定性有很大的關係。儲存電子通過高頻共振腔時,可以補充運轉時所輻射損失的能量,高頻共振腔的能量由RF transmitter所提供。RF transmitter產生500MHz高功率高頻輸出能量,在共振腔內建立加速電場;但同時,系統本身的雜訊也會與500MHz高頻訊號一起傳送到共振腔。這些雜訊會造成電子的擾動。文章內將對RF transmitter的訊號源,陰極電壓,加速級電壓作診斷,並提出解決辦法。經過一些努力,RF transmitter的輸出品質在120Hz以上已經達到了我們的要求。
另外為了解超導共振腔功率偶合器內電子雪崩(multipacting)放電現象,我們設計了高功率高頻阻抗模擬器。超導共振腔由於wall loss很小,在有beam loading的情況下反射係數的變動非常大,使得偶合器內的電子雪崩放電現象較難事先掌握。我們設計的高功率高頻阻抗模擬器可以相當大範圍地改變反射係數的大小及相位,可以模擬超導共振腔在beam loading時的反射情形,進而對電子雪崩放電現象有更深的了解。
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