Return-Path: Received: from mx2.fz-rossendorf.de ([149.220.142.12] verified) by hzdr.de (CommuniGate Pro SMTP 6.1.9) with ESMTP id 13217289 for picongpu-users@cg.hzdr.de; Mon, 02 May 2016 13:06:25 +0200 Received: from localhost (localhost [127.0.0.1]) by mx2.fz-rossendorf.de (Postfix) with ESMTP id 20EAF455F9 for ; Mon, 2 May 2016 13:06:25 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mx2.fz-rossendorf.de Received: from mx2.fz-rossendorf.de ([127.0.0.1]) by localhost (mx2.fz-rossendorf.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3USxuwsLXgEn for ; Mon, 2 May 2016 13:06:20 +0200 (CEST) Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=147.231.234.10; helo=mailgw.eli-beams.eu; envelope-from=prvs=193075a5a1=danila.khikhlukha@eli-beams.eu; receiver=picongpu-users@hzdr.de Received: from mailgw.eli-beams.eu (mailgw.eli-beams.eu [147.231.234.10]) by mx2.fz-rossendorf.de (Postfix) with ESMTPS id 4262E44FB9 for ; Mon, 2 May 2016 13:06:20 +0200 (CEST) Received: from braun.eli-beams.eu ([10.1.5.17]) by mailgw.eli-beams.eu with ESMTP id u42B6Jas011099-u42B6Jau011099 (version=TLSv1.0 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Mon, 2 May 2016 13:06:19 +0200 Received: from BRAUN.eli-beams.eu ([::1]) by braun.eli-beams.eu ([::1]) with mapi id 14.03.0279.002; Mon, 2 May 2016 13:06:19 +0200 From: Khikhlukha Danila To: "picongpu-users@hzdr.de" Subject: laserGaussianBeam initialization Thread-Topic: laserGaussianBeam initialization Thread-Index: AdGkYqd4HG6mCoD/RRKejZvgnJL6ww== Date: Mon, 2 May 2016 11:06:19 +0000 Message-ID: Accept-Language: en-US, cs-CZ Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.36.30.5] Content-Type: multipart/alternative; boundary="_000_BA7C853FEE430847B9C35FFCC6E5B2A52606FBDDbraunelibeamseu_" MIME-Version: 1.0 --_000_BA7C853FEE430847B9C35FFCC6E5B2A52606FBDDbraunelibeamseu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all, I have a couple of short questions regarding the Gaussian beam initializati= on. 1. As far as I understood from the code comments (simulation_defines/param/= laserConfig.param) the initialization for laser pulse is done based on the sigma of the intens= ity envelope. However in the code (src/picongpu/include/fields/laserProfiles/laserGaussianBeam.hpp) it looks = like PULSE_LENGTH is the sigma of electrical field envelope. I also wasn't able to find any conversion (namely sqrt(2)) 2. So at the moment I'm assuming that the initialization of the Gaussian be= am is done based on the sigma of an electrical field envelope. So if we consider k =3D 2*sqrt(2*log(2))=3D2.3548 as a coefficient between = FWHM and sigma of the Gaussian curve then the coefficient between sigma of an electrical field and FWHM of the i= ntensity becomes sqrt(2)/k =3D 0.6006. However, in comments for laserGaussianBeam it is stated the number 1./1.177= 41 =3D 0.8493 and I'm not sure what is it. Can you please double check if comments are up-to-date? Otherwise I got som= ething wrong in the description. Thank you, Danila. --_000_BA7C853FEE430847B9C35FFCC6E5B2A52606FBDDbraunelibeamseu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi all,          &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp; 
            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;      
I have a couple of short questions regarding the Gaussian beam initializati= on.            =             &nb= sp;            =     
            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;      
1. As far as I understood from the code comments (simulation_defines/param/= laserConfig.param)         &nb= sp;            =       
the initialization for laser pulse is done based on the sigma of the intens= ity envelope. However in the code       =     
(src/picongpu/include/fields/laserProfiles/laserGaussianBeam.hpp) it looks = like PULSE_LENGTH is the sigma of electrical field envelope.
I also wasn't able to find any conversion (namely sqrt(2))   = ;            &n= bsp;            = ;            &n= bsp;            = ;        
            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;      
2. So at the moment I'm assuming that the initialization of the Gaussian be= am is done based on the sigma of an electrical field envelope.
So if we consider k =3D 2*sqrt(2*log(2))=3D2.3548 as a coefficient between = FWHM and sigma of the Gaussian curve      &nb= sp;     
then the coefficient between sigma of an electrical field and FWHM of the i= ntensity becomes sqrt(2)/k =3D 0.6006.      &= nbsp; 
However, in comments for laserGaussianBeam it is stated the number 1./1.177= 41 =3D 0.8493 and I'm not sure what is it.     &nb= sp; 
            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;      
Can you please double check if comments are up-to-date? Otherwise I got som= ething wrong in the description.       &= nbsp;  
            &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;            =             &nb= sp;      
Thank you,           = ;            &n= bsp;            = ;            &n= bsp;            = ;            &n= bsp;            = ;            
Danila.
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