[FLASH-USERS] Significant difference was found in 2d LaserSlab simulation between in cylindrical and cartesian coordiates

[Wu, Yaoxing]

Dear Zhu,

Thanks for your message. The laser spot size is 20 um (ed_targetSemiAxisMajor_1 = 10e-04), and it seems the spot size can only be adjusted by this variable regardless of coordinates.

In my opinion, the variables with labeled “Z” represent the Y direction in the R-z geometry (cylindrical coordinates), while the variables with labeled “Y” are not used.

However, in cartesian coordinates, the variables with labeled “Y” represent the Y direction, while the variables with labeled “Z” are not used. So I replaced the variables labeled “Z” in cylindrical with “Y” in cartesian coordinates. Below is the laser parameter details in cartesian coordinates (variables labeled “Z” have been commented):

[cid:image003.png at 01D8E530.F37D3690]

Could you please tell me how to give a correct conversion for laser parameters from 2D cylindrical to cartesian coordinates?

Thanks again for your help. I would appreciate any suggestions or help.

Best regards,
Yaoxing Wu

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From: leizhuray<mailto:leizhuray at pku.edu.cn>
Sent: 2022年10月20日 12:16
To: Wu, Yaoxing<mailto:wu1587 at purdue.edu>
Cc: flash-users at flash.rochester.edu<mailto:flash-users at flash.rochester.edu>
Subject: Re: [FLASH-USERS] Significant difference was found in 2d LaserSlab simulation between in cylindrical and cartesian coordiates

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Dear Wu,

What's the laser spot size in your simulation? In 2D cartesian of FLASH, I remember that the length of laser spot in z-axis is 1 cm, which could lead to the laser intensity is much lower than 3D or cylindrical.

Zhu
[https://mail-online.nosdn.127.net/smc682ad7543778da983eb93c2d5eba8ea.jpg]
leizhuray
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leizhuray at pku.edu.cn
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Wu, Yaoxing<wu1587 at purdue.edu> <mailto:wu1587 at purdue.edu>
Date
10/20/2022 11:55
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Subject
[FLASH-USERS] Significant difference was found in 2d LaserSlab simulation between in cylindrical and cartesian coordiates
Dear Flash users & developers,

I am having a problem was the simulation in 2D cartesian based on LaserSlab. The “example.par” simulation in LaserSlab is in cylindrical coordiates. I’d like to transfer this simulation to cartesian and hope to get similar results. However, the electron temperature (Te) in cartesian is lower 1-2 order of magnitude compared to cylindrical (see attached pictures) at same laser spot size, pulse duration and energy. Could you please tell me the reason?

Because the 3D-in-2D ray trace algorithm can only be used in the cylindrical coordinate, the laser cross section was set to “gaussian1D” in cartesian. Then I think the laser power at a moment should be calculated by a single integral (shows below):

[cid:image001.png at 01D8E531.AA8E7290]

The laser energy was checked from the output file “lasslab_LaserEnergyProfile.dat” and was same with the setup in .par file. So I do not know why the Te in 2D cartesian was much lower than that in 2D cylindrical.

I would appreciate for your any help or suggestions. Thanks.

Regards,
Yaoxing Wu


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