22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 1
Electron cloud studies at TU Darmstadt and GSI
O. Boine-Frankenheim, O. Haas, F. Petrov
Institut Theorie Elektromagnetischer Felder (TEMF)Computational Electromagnetics Laboratory
TEMF Staff
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 2
Oliver Boine-Frankenheim
Accelerator physicsand GSI Beam physics department
Harald Klingbeil
Accelerator technologyandGSI Ring RF department
Thomas Weiland
Head of the institute
Sebastian Schöps
Comput. Electromagnetics
Irina Munteanu
Finite MethodsandCST AG
Professors:
Research group leaders:
+ 36 Phd students and Postdocs (17 with accelerator related topics)+ 11 external PhD students (3 at CERN)
Wolfgang AckermannHigh frequencies
Erion GjonajCoupled problems
Wolfgang MüllerBeam dynamics
Infrastructure: TEMF Computing Cluster
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 3
172 nodes, 2.064 cores, 21.89 TFlop/s
Fast Quad Data Rate (QDR) Infiniband connections
Used for parallel computing with MPI.
Simulation tools available at TEMFfor electron cloud related studies
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 4
py-orbit (Shishlo, Cousineau, Holmes et al.) o https://code.google.com/p/py-orbit/o Teapot trackingo 2D/3D space charge solverso Parallel implementation (MPI)-> coherent/incoherent e-cloud effectsVORPAL® now VSim® (Tech-X, Boulder, CO)
o 3D EM PIC solvers -> Electron cloud buildup studies-> Microwave transmission studies-> Wake field studies
CST Studio® (CST AG, Darmstadt)o 3D EM and particle solvers-> Microwave transmission studies
Commercial codes: Community maintained codes:
Codes/modules under development at TEMF (see talks by O. Haas/F. Petrov):o Residual gas ionization and SEY modelso 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) -> githubo Coupling to pyorbit (under development -> talk by O. Haas)
Electron clouds in SIS100electron trapping in intense coasting ion beams
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 5
Fedor Petrov
F. Petrov, O. Boine-F., When do residual gas electron destabilize an ion beam ?NIM A (2013)
BMBF project 06DA9022I (until end of 2012)
Neutralization degree determined by: - e-I Coulomb collision (good vacuum)- two-stream instability (bad vacuum)
Beam dynamics + electron cloud buildup !
Equilibrium neutralization: Coulomb heating vs. electron trapping
Electron clouds in the CERN LHC
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 6
O. Boine-F., F. Petrov, Th. Weiland, G. Rumolo,
Energy loss and longitudinal wakefield of
relativistic short proton bunches in electron cloudsPhys. Rev. ST-AB (2012)
Space charge limited or saturated electron cloud density.
Longitudinal wakefield: Saturated vs. homogeneous cloud
next step -> incoherent tune spread (talk by F. Petrov)
BMBF project 05H12RD7 (until end of 2014)
Stopping powerin a saturated cloud:
Simulation of microwave transmission
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 7
Oliver Haas
F. Caspers, S. Federmann, et al.
O. Haas, O. Boine-F., F. Petrov,Simulations of the electron cloud buildup and its influence on the microwave transmission measurement, NIM A (2013)
Detailed buildup simulations (VORPAL)
Effective electron density:
German government funding for joint projects with CERN
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 8
High energy physics: 4 % for accelerators
ATLAS: 31,8
CMS: 15,8
LHCb: 3,5
Theorie: 3,5
R&D DET.: 0,6
Belle II /NA62OPERA:6,1
R&D Accel: 2,6
64 M€
Marius Groll, PT-DESY, KfB Treffen
in M€
Funding period 2012-2014
Next BMBF call for the funding period 2015-2017: End 2014
TEMF: 0,3 (= 2 projects)
German Ministry for Education and Research (BMBF)
Projects between CERNand German university groups
-> Discussion of possible joint projects related to electron clouds- simulation code development- specific studies (coherent/incoherent effects)- measurement techniques- interplay: impedances, e-clouds,….
Johanna Wanka (German Minister)
Many thanks for your attention.
22. April 2023 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Oliver Boine-Frankenheim | 9