迴旋加速器固體靶熱傳分析

Abstract

本文主要針對迴旋加速器固體靶以FLUENT軟體作熱傳數值模擬，以改變質子束聚焦情況和冷卻水流率作分析並與F.M.Nortier等(1995)使用ALGOR程式作有限元素分析(FEA)結果做比較，並以此為基礎，加入同位素靶材模擬現行照射條件下，產生的靶面最高溫度。 主要探討在不同的質子束聚焦情況及不同的冷卻水流率時，其靶面的最高溫度，並且加入不同的同位素靶材Tl-203、Zn-68、Cd-112及Ni-58 分別以現行所採用的照射能量及電流模擬出靶的熱傳遞。綜合所獲得的結果，當冷卻水流率越低，其靶面溫度上升斜率越高；並在聚焦情況越集中時，靶面溫度上升斜率越高；同位素靶材的熱傳導係數與靶面最高溫度成反比；靶材厚度越厚，靶面溫度會越高；以現行照射條件，不同的同位素靶材Tl-203、Zn-68、Cd-112及Ni-58於beam spill為20﹪時，靶面最高溫度分別為99.8℃、62.6℃、58.0℃及73.4℃。

The aim of this simulation is to investigate heat transfer of cyclotron solid targets by FLUENT software, variations of proton beam of focusing situation and cooling water of flow rate to analyze as compared with the FM Nortier et al.(1995) by using ALGOR finite element analysis (FEA) results and based on the above results, to add the isotope and using present irradiation conditions, simulate the heat transfer of targets. Focuses on the proton beam of focusing situations and cooling water of flow rate and the maximum temperature of the targets with different isotopes(Tl-203、Zn-68、Cd-112 and Ni-58), and are used to the present energy and current to simulate the heat transfer of targets. Integrated the results obtained, when the cooling water flow rate is lower, the temperature of targets rises more than ever quick; and focusing situation is more concentration, the temperature of targets rises more than ever quick; the isotope targets of thermal conductivity and maximum temperature of the targets are in reverse proportion; the thickness of target materials is thicker, the temperature of targets will be higher; using the present irradiation conditions and different isotope targets,Tl-203、Zn-68、Cd-112 and Ni-58 at beam spill 20%, the maximum temperature of the target surface respectively be 99.8 ℃, 62.6 ℃, 58.0 ℃ and 73.4 ℃.