Return-Path: Received: from [149.220.60.110] (account huebl@hzdr.de [149.220.60.110] verified) by hzdr.de (CommuniGate Pro SMTP 6.1.5) with ESMTPSA id 11976955; Wed, 09 Sep 2015 17:06:10 +0200 Message-ID: <55F04AE1.9020905@hzdr.de> Date: Wed, 09 Sep 2015 17:06:09 +0200 From: "Huebl, Axel" MIME-Version: 1.0 To: picongpu-users@hzdr.de CC: Remi Lehe , Klaus Steiniger Subject: [Bug] 2D3V Gaussian Beam Amplitude Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms010004040601070108050204" This is a cryptographically signed message in MIME format. --------------ms010004040601070108050204 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Dear PIConGPU-Users, in case you are using the Gaussian-Beam implementation and performing 2D3V simulations, you will be affected by the following bug (all releases including `0.1.0`): In the Gaussian Laser pulse *underestimates* the laser amplitude in 2D3V by square root of the ratio of the focal spot size over the spot size at the beginning of the simulation (FOCUS_POS_SI in laserConfig.param). For short focal positions, this does not cause dramatic differences (few percent and below) but 3D3V moving window simulations are highly encouraged to cross-check! The full description of the issue is provided here: https://github.com/ComputationalRadiationPhysics/picongpu/issues/1052 A patch will follow at the end of this day. Note: The 2D3V implementation is an inherited specialization from our 3D3V default geometry. Unfortunately, some parts such as analytical formulas for initializations are not fully cross-checked in 2D3V yet. This bug is basically a missing implementation for 2D3V and if you should spot similar problems feel free to report them in our GitHub issue tracker! https://github.com/ComputationalRadiationPhysics/picongpu/issues Thanks to R=C3=A9mi Lehe (LBNL) for pointing me to the discrepancy and to= Klaus Steiniger (HZDR) quickly pulling out this Diploma thesis containing a great description! Best regards, Axel Huebl --=20 Axel Huebl Phone +49 351 260 3582 https://www.hzdr.de/crp Computational Radiation Physics Laser Particle Acceleration Division Helmholtz-Zentrum Dresden - Rossendorf e.V. Bautzner Landstrasse 400, 01328 Dresden POB 510119, D-01314 Dresden Vorstand: Prof. Dr.Dr.h.c. R. Sauerbrey Prof. Dr.Dr.h.c. P. 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