Electron cloud studies at TU Darmstadt and GSI

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1 Electron cloud studies at TU Darmstadt and GSI O. Boine-Frankenheim, O. Haas, F. Petrov Institut Theorie Elektromagnetischer Felder (TEMF) Computational Electromagnetics Laboratory December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 1

2 TEMF Staff Professors: Oliver Boine-Frankenheim Accelerator physics and GSI Beam physics department Harald Klingbeil Accelerator technology and GSI Ring RF department Irina Munteanu Finite Methods and CST AG Sebastian Schöps Comput. Electromagnetics Research group leaders: Thomas Weiland Head of the institute + 36 Phd students and Postdocs (17 with accelerator related topics) + 11 external PhD students (3 at CERN) Wolfgang Ackermann High frequencies Erion Gjonaj Coupled problems Wolfgang Müller Beam dynamics December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 2

3 Infrastructure: TEMF Computing Cluster 172 nodes, cores, TFlop/s Used for parallel computing with MPI. Fast Quad Data Rate (QDR) Infiniband connections December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 3

4 Simulation tools available at TEMF for electron cloud related studies Commercial codes: CST Studio (CST AG, Darmstadt) o 3D EM and particle solvers -> Microwave transmission studies VORPAL now VSim (Tech-X, Boulder, CO) o 3D EM PIC solvers -> Electron cloud buildup studies -> Microwave transmission studies -> Wake field studies Community maintained codes: py-orbit (Shishlo, Cousineau, Holmes et al.) o o Teapot tracking o 2D/3D space charge solvers o Parallel implementation (MPI) -> coherent/incoherent e-cloud effects Codes/modules under development at TEMF (see talks by O. Haas/F. Petrov): o Residual gas ionization and SEY models o Fast 2D/3D Poisson solvers for arbitrary shaped pipes (Python/C++ version on github) o Electron cloud buildup codes (2D PIC with ionization and SEY models) -> github o Coupling to pyorbit (under development -> talk by O. Haas) December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 4

5 Electron clouds in SIS100 electron trapping in intense coasting ion beams Equilibrium neutralization: Coulomb heating vs. electron trapping U 28+ BMBF project 06DA9022I (until end of 2012) F. Petrov, O. Boine-F., When do residual gas electron destabilize an ion beam? NIM A (2013) Neutralization degree determined by: - e-i Coulomb collision (good vacuum) - two-stream instability (bad vacuum) Fedor Petrov Beam dynamics + electron cloud buildup! December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 5

6 Electron clouds in the CERN LHC BMBF project 05H12RD7 (until end of 2014) Space charge limited v0 = c or saturated electron cloud density. v0 = c Stopping power in a saturated cloud: κe = ω pe c Longitudinal wake field: Saturated vs. homogeneous cloud next step -> incoherent tune spread (talk by F. Petrov) O. Boine-F., F. Petrov, Th. Weiland, G. Rumolo, Energy loss and longitudinal wakefield of relativistic short proton bunches in electron clouds Phys. Rev. ST-AB (2012) December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 6

7 Simulation of microwave transmission F. Caspers, S. Federmann, et al. Oliver Haas Detailed buildup simulations (VORPAL) Effective electron density: O. Haas, O. Boine-F., F. Petrov, Simulations of the electron cloud buildup and its influence on the microwave transmission measurement, NIM A (2013) December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 7

8 German government funding for joint projects with CERN Funding period High energy physics: 4 % for accelerators Belle II / NA62 OPERA: 6,1 R&D Accel: 2,6 Theorie: 3,5 R&D DET.: 0,6 German Ministry for Education and Research (BMBF) TEMF: 0,3 (= 2 projects) Projects between CERN and German university groups Johanna Wanka (German Minister) LHCb: 3,5 CMS: 15,8 64 M in M ATLAS: 31,8 Marius Groll, PT-DESY, KfB Treffen Next BMBF call for the funding period : End > Discussion of possible joint projects related to electron clouds - simulation code development - specific studies (coherent/incoherent effects) - measurement techniques - interplay: impedances, e-clouds,. December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 8

9 Many thanks for your attention. December 15, 2013 TU Darmstadt Fachbereich 18 Institut Theorie Elektromagnetischer Felder Oliver Boine-Frankenheim 9