Accelerator Theory and Simulation at Rostock University
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1 Accelerator Theory and Simulation at Rostock University Hans-Walter Glock, Thomas Flisgen Gisela Pöplau Linear Collider Forum, 1st Meeting, June 14-15, 2010 DESY, Hamburg UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK
2 Fields of Competence and Interest In general Application and theory of electromagnetic field simulation Especially according directly to particle accelerators Fast Poisson solvers for space charge influenced beam dynamics Modelling of electron-cloud dynamics Decomposition techniques for large structure s eigenmode / scattering properties HOM spectra analysis w.r.t. damping measures and beam diagnostics UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK 2
3 DoHRo*, EUCARD**, Rostock DoHRo HOM: -AP 1: HOM damping design for BERLINPRO -AP 2: HOM damping design for ESS high energy part of p-linac -AP 3: Simplified electronics for HOM coupler signal based beam analysis EUCARD* WP : HOM distribution and geometrical dependencies (FLASH-1.3, FLASH-3.9, XFEL(?)) needed for HOM coupler signal based beam analysis CERN-SPL**: HOM damping design for CERN-SPL-Study *DoHRo: Dortmund-HZB-Rostock "Innovative Technologien und Komponenten zukünftiger Teilchenbeschleuniger in Strahlungsquellen, funding approved by German Federal Ministry of Research+Education **EUCARD: EU FP7 Research Infrastructure Grant No ***CERN-SPL: "Design of HOM-Damping for CERN-SPL ; funded by German Federal Ministry of Research+Education, Project: 05H09HR UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock 3 3
4 As an example: Fermilab-build 3.9 GHz-3rd Harmonic FLASH picture taken from: D. Mitchell, N. Solyak, T. Khabiboulline et.al., : "Mechanical Design and Engineering of the 3.9 GHz, 3rd Harmonic, SRF System at Fermilab", Poster presented at SRF03 Module of 4 x 9-cell-cavity, each: 1 power coupler, 2 HOM-coupler, 1 pickup UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock - Thomas Flisgen 4 4
5 Concatenation procedure based on scattering properties: Coupled S-Parameter Computation = CSC Split structure in sections Compute scattering (S-) parameters of all sections individually with appropriate solvers Compute overall S-parameters as function of f with special algorithm*, applicable to any structure topology and mode number Derive loaded Q-values from S-parameter spectra (comp. IPAC'10, WEPEC008) *: e.g.: H.-W. Glock, K. Rothemund, U. van Rienen: "CSC - A System for Coupled S-Parameter Calculations", TESLA-Report or K. Rothemund, H.-W. Glock, U. van Rienen: "Eigenmode Calculation of Complex RF-Structures using S- Parameters", IEEE Transactions on Magnetics, Vol. 36, (2000): and references therein UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock - Thomas Flisgen 5 5
6 HOM-HOM transmission in cavity string vs. single cavity Pipe length L=102mm S21 / db Modelling of entire module is needed! frequency / Hz UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock - Thomas Flisgen 6 6
7 3rdHarm (IPAC`10, WEPEC052): HOM-HOM transmission single cavity and string of 4 cavities UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK H.-W. Glock - Thomas Flisgen 7 7
8 Efficient 3D Space Charge Algorithms (supported by DFG) Development of the software package MOEVE Multigrid for non-equidistant grids to solve Poisson s equation MOEVE as part of tracking codes MOEVE PIC Tracking for e-cloud studies (Aleksandar Markovik, Rostock) ASTRA (Klaus Flöttmann, DESY, Hamburg) GPT 2.7 (General Particle Tracer, Pulsar Physics, Eindhoven, NL) New FFT solvers integrated Green s function, implementation in ASTRA) NFFT for fast summation (next slide) MOEWE: sea gull UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK G. Pöplau 8
9 Longitud. modulated XFEL bunch, 7 cm behind cathode MOEVE: Projects and Work in Progress Projects Investigation of micro bunching for the XFEL in the low energy regime (M. Dohlus et al. TESLA FEL ) Work in Progress Efficient space charge calculations by adaptive discretization techniques (ICAP 09, THPsc044, IPAC'10, TUPEC049) Fast calculation of Particle-Particle interactions by NFFT (NFFT: Nonequidistand Fast Fourier Transform) (ICAP 09, THPsc011) Adaptive discretization: XFEL bunch, 7 cm after cathode UNIVERSITÄT ROSTOCK FAKULTÄT INFORMATIK UND ELEKTROTECHNIK G. Pöplau 9
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