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Dear Fernando,
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Thanks for your answer! So \phi is the angle between s1 and the projection of z-axis on the elliptical target. I get it!
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Thank you!
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Chen Yunan
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-----原始邮件-----<br>
<b>发件人:</b> <span id="rc_from">"Fernando Garcia Rubio" <fernando@pacificfusion.com></span><br>
<b>发送时间:</b> <span id="rc_senttime">2023-11-29 01:28:04 (星期三)</span><br>
<b>收件人:</b> cya_@nudt.edu.cn<br>
<b>抄送:</b> "flash-users@flash.rochester.edu" <flash-users@flash.rochester.edu><br>
<b>主题:</b> Re: [FLASH-USERS] The laser beam<br>
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Hi Chen,
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I believe that the equation is correct, but the Figure 17.6 might be misleading. The text above Fig. 17.6 states that \phi is the <b>torsional </b>angle with the z-axis, not the angle between s1 and z. Hence, to my understanding, in order to derive s1z, one has to project into this angle (cos \phi), and then take into account the orientation of the elliptical target into the z axes (\theta - pi/2).
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Hope this helps!
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Fernando
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On Nov 28, 2023, at 2:51 AM, cya_@nudt.edu.cn wrote:
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<span style="font-family:Arial;">Dear FLASH Users,</span>
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<span style="font-family:Arial;">I have a question in Section 17.4.6.1 of the User's Guide, which is about the laser beam. The question is w</span><span style="font-family:Arial;">hy the local z-axis projection of s</span><sub style="font-family:Arial;">1<span class="Apple-converted-space"> </span></sub><span style="font-family:Arial;">is<span class="Apple-converted-space"> </span></span><em style="font-family:Arial;">l<sub>1</sub>cos(\phi)<sub>1</sub></em><span style="font-family:Arial;"></span><span style="font-family:Arial;"></span><em style="font-family:Arial;">cos(\theta - \pi /2)</em><span style="font-family:Arial;"><span class="Apple-converted-space"> </span>rather<span class="Apple-converted-space"> </span></span><span style="font-family:Arial;">than </span><em style="font-family:Arial;">l<sub>1</sub>cos(\phi)<sub>1</sub></em><sub style="font-family:Arial;"><span class="Apple-converted-space"> </span></sub><span style="font-family:Arial;">in equation 17.72.</span>
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<span style="font-family:Arial;">Any possible suggestions would be great appreciated!</span>
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<span style="font-family:Arial;">Best wishes, <br>
Chen Yunan</span><br>
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