Uwe Niedermayer Institut für Theorie Elektromagnetischer Felder

Slides:



Advertisements
Ähnliche Präsentationen
Finding the Pattern You Need: The Design Pattern Intent Ontology
Advertisements

Die Schulregeln (the school rules) Kein Graffiti in der Schule!
Verbs Used Impersonally With Dative Deutsch I/II Fr. Spampinato.
Institut für Angewandte Mikroelektronik und Datentechnik Fachbereich Elektrotechnik und Informationstechnik, Universität Rostock Spezielle Anwendungen.
You need to use your mouse to see this presentation © Heidi Behrens.
You need to use your mouse to see this presentation © Heidi Behrens.
You need to use your mouse to see this presentation © Heidi Behrens.
You need to use your mouse to see this presentation © Heidi Behrens.
NARVAL Meeting 12./13. January 2012
| TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Dip.-Ing. Cong Liu | 1 Various approaches to electromagnetic.
Titelmasterformat durch Klicken bearbeiten Textmasterformate durch Klicken bearbeiten Zweite Ebene Dritte Ebene Vierte Ebene Fünfte Ebene 1 Titelmasterformat.
Institut für Angewandte Mikroelektronik und Datentechnik Course and contest Results of Phase Selected Topics in VLSI Design (Module 24513) ©
KIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH) The dependence of convection-related parameters on surface and.
J. Neymeyer, T. Wülfing, W. Abdul-Wahab Al-Ansari, A. Apostolidis, S
Institut für Angewandte Mikroelektronik und Datentechnik Phase 5 Architectural impact on ASIC and FPGA Nils Büscher Selected Topics in VLSI Design (Module.
Institut für Angewandte Mikroelektronik und Datentechnik Course and contest Results of Phase 3 Vincent Wiese Selected Topics in VLSI Design (Module 24513)
1IWF/ÖAW GRAZ Data Combination David Fischer, Rumi Nakamura (IWF/OeAW)  Fluxgate: noise + distortion gets worse than the searchcoil at ~ 6 Hz.  Searchcoil:
Institut für Angewandte Mikroelektronik und Datentechnik Course and contest Results of Phase 4 Nils Büscher Selected Topics in VLSI Design (Module 24513)
Institut für Angewandte Mikroelektronik und Datentechnik Course and Contest Results of Phase 5 Eike Schweißguth Selected Topics in VLSI Design (Module.
16 April 2015 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 1 Single Beam Collective Effects Impedances.
Literary Machines, zusammengestellt für ::COLLABOR:: von H. Mittendorfer Literary MACHINES 1980 bis 1987, by Theodor Holm NELSON ISBN
Arbeiten in einem agilen Team mit VS & TFS 11
Institut für Angewandte Mikroelektronik und Datentechnik Results of Phase 4: Layout for ST65 technology by Christoph Niemann Selected Topics.
The influence of spatial variability of polar firn on microwave emission Martin Proksch 1, Henning Löwe 1, Stefanie Weissbach 2, Martin Schneebeli 1 1.
Nachweis von B 0 s -Oszillationen mit dem ATLAS Detektor am LHC B. Epp 1, V.M. Ghete 2, E. Kneringer 1, D. Kuhn 1, A. Nairz 3 1 Institut für Experimentalphysik,
How does the Summer Party of the LMU work? - Organizations and Networks -
Institut für Angewandte Mikroelektronik und Datentechnik Results of phase 5: Investigations on a specific topic Special Features of the Virtex-6 FPGAs.
Magnetenzephalogramm, MEG
Gregor Graf Oracle Portal (Part of the Oracle Application Server 9i) Gregor Graf (2001,2002)
Fakultät für Gesundheitswissenschaften Gesundheitsökonomie und Gesundheitsmanagement Universität Bielefeld WP 3.1 and WP 4.1: Macrocost.
Kapitel 2 Grammar INDEX 1.Subjects & Verbs 2.Conjugation of Verbs 3.Subject Verb Agreement 4.Person and Number 5.Present Tense 6.Word Order: Position of.
Memorisation techniques
Here‘s what we‘ll do... Talk to the person sitting in front of you. Introduce each other, and ask each other questions concerning the information on your.
Outline Collaborators HgTe as a 3D topological insulator Sample design
Pion-Photon Reactions and Chiral Dynamics in Primakoff Processes at COMPASS Markus Krämer on behalf of the COMPASS collaboration supported by: Maier-Leibnitz-Labor.
On the case of German has 4 cases NOMINATIVE ACCUSATIVE GENITIVE DATIVE.
QUEST-Meeting, 14. Dez. 2007, Offenbach Parametrisierung der Verdunstung in einem 2-Momenten-Schema Axel Seifert Deutscher Wetterdienst, Offenbach Geschäftsbereich.
Money rules the medicine?! A presentation by Jan Peter Hoffmann European healthcare systems in comparison.
Klinik und Poliklinik für Augenheilkunde Morphology, Accuracy, and Histology of Corneal Flap Cuts Using a 200 kHz Femtosecond Laser Augenklinik, Klinikum.
Mitglied der Helmholtz-Gemeinschaft Questions to HESR 6 th March 2012 PANDA-meetingDieter Prasuhn.
Teck-Realschule, Kirchheim, GERMANY At TECK-REALSCHULE COMENIUS meeting in Kirchheim 10 – 16 May 2013 No risk but a lot of fun!!! “No risk – no fun?” “Ohne.
Technische Universität München In-situ Synchrotron and Neutron Diffraction studies on phase transformation in Austempered Ductile Iron (ADI) Xiaohu Li.
Essay structure Example: Die fetten Jahre sind vorbei: Was passiert auf der Almhütte? Welche Bedeutung hat sie für jede der vier Personen? Intro: One or.
LLP DE-COMENIUS-CMP Dieses Projekt wurde mit Unterstützung der Europäischen Kommission finanziert. Die Verantwortung für den Inhalt dieser.
Andere Sportarten. schwimmen ringen boxen  das Zelt.
The FUTURE to boldly go where no man has boldly gone before!
Premiere Conferencing GmbH
High Temperature Superconductor Coating for the FCC-hh Beam Pipe
Du bist am dicksten und am dümmsten.
Jetzt machen Venues aufmachen!!! Geh zu
Jetzt machen Venues aufmachen!!! Geh zu
Process and Impact of Re-Inspection in NRW
Get your Project started
Students have revised SEIN and HABEN for homework
Pädagogische Hochschule NÖ
“wish” “as if” “if only it were so”
CERN – TUD – GSI Webmeeting
THE PERFECT TENSE IN GERMAN
Results from CO2 heat pump applications
Ferrite Material Modeling (1) : Kicker principle
Health Card for refugees in Bremen
Collaborative Webmeeting November 24th, 2010 Geneve / Darmstadt
Wie viel Uhr ist es? Telling Time.
„Förderwolke“ A Cloud-based exchange platform for the qualitative enhancement and improvement of inclusive education Dipl. Reha-Päd. Hanna Linke scientific.
Official Statistics Web Cartography in Germany − Regional Statistics, Federal and European Elections, Future Activities − Joint Working Party meeting.
Calorimetry as an efficiency factor for biogas plants?
Zhunussova G., AA 81. Linguistic communication, i.e. the use of language, is characteristically vocal and verbal behaviour, involving the use of discrete.
 Präsentation transkript:

Single Beam Collective Effects Impedances and Collective Effects for FCC-hh Uwe Niedermayer Institut für Theorie Elektromagnetischer Felder Technische Universität Darmstadt, Germany niedermayer@temf.tu-darmstadt.de With a lot of input from: B.Salvant, X. Buffat, N.Nounet, D. Schulte, CERN T. Egenolf, F. Petrov, O. Boine-Frankenheim, TUD 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 1 24 April 2017 | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Prof. Dr.-Ing. Thomas Weiland

Contents As discussed in Washington: Beam pipe impedance Other impedance sources Coupled bunch instability Transverse Mode Coupling Instability (TMCI) threshold Few new things and issues to be discussed: Which components? Details on the pipe… Plans, codes, outlines, timelines Collimators!!! Pipe aperture!!! 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 2

The beam pipe Design by R. Kersevan, CERN So far only this design considered D. Schulte 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 3

Discretization GMSH (Geuzaine et al.) triangular mesh Meshing the whole structure is required only for extremely low frequency! Otherwise: Surface Impedance Boundary Condition (SIBC) Thilo Egenolf, TU Darmstadt 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 4

2D Simulations in the Frequency Domain BeamImpedance2D, PYTHON code using FEniCS finite element toolbox (U. Niedermayer et al., PRSTAB 18 032001, 2015) Horizontal Vertical f=100Hz f=1MHz 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 5

Materials Beam Screen: Titanium Coating: Copper (80um or maybe higher) Outer pipe, synchr. rad. reflector: Stainless Steel Conductivities k at room temperature T=293K -Titanium: k0= 1.8 MS/m -Copper: k0 = 60.0 MS/m -Stainless steel: k0 = 1.4 MS/m RRR= k(T=4K)/ k(293K) usually RRR ~ 300 Temperatures for the FCC pipe: -Scenario 1: 40-60 K (roughly… k =100 k0 ) -Scenario 2: 120-160 K (roughly… k =10 k0) Magnetoresistance at 16T ? 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 6

Penetration depth Surface impedance for coated surface 6.4kHz Vacuum Copper Titanium 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 7

Comparison with round pipe impedance  Horizontal (1 meter pipe) Coating with Copper at 50K, k=6e9 S/m X2.0 An artifact, due to numerical cancelation at high gamma Skindepth=coating thickness 80um 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 8

Comparison with round pipe impedance  Vertical (1 meter pipe) X1.4 An artifact, due to numerical cancelation at high gamma Skindepth=coating thickness 80 um 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 9

Pumping Holes, Collimators, … Pumping holes with resonator model, ... fres=fcutoff ~6GHz Q=1 (Broadband) B. Salvant and X. Buffat, CERN S. Kurennoy, Part. Accel., 1995, Vol. 50, pp. 167-175 Collimators scaled from LHC, see also talk by M. Fiascaris (this morning) Collimators closed only at top energy! Maybe LHC-like carbon collimators are not the best choice… 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 10

Scenario Data M=13344 (25ns) rms bunch length 8 cm Nb=1.0e11 Qx=120.31 Qy=120.32 Chroma=0 E=3TeV Qs=0.0028 E=50TeV Qs=0.0078 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 11

Coupled bunch resistive instability Most critical at injection due to less stiff beam! most unstable coupled-bunch mode at lowest frequency=2kHz Pipe only, solid Cu 50K E=3TeV Growth rate by factor 1.6 higher for 80 um coating Required thickness for “thick wall“ 150 um for 50K 450 um for 140K N. Mounet, EPFL Lausanne, formerly CERN 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 12

TMCI intensity threshold 3TeV coherent tune shift of the mode Pipe +holes Pipe only B. Salvant and X. Buffat, CERN 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 13

TMCI intensity threshold 50TeV More stiff beam, but higher impedance due to closed collimators Pipe + holes + collimators B. Salvant and X. Buffat, CERN 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 14

Conclusion FCC-hh already on the edge of stability only with resistive pipe 50 turns feedback possible but maybe insufficient 10 turns feedback possible? Kickers not yet considered Landau damping and Octupoles not yet considered Impedance should play an important role in collimator design 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 15

Holes and rips 3D simulations in the time domain by CST Particle Studio® Stabilization fins between beam pipe and reflector Vacuum pumping holes 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 16

Wakefield simulation of hole Small effect, in the order of the numerical error! 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 17

Updates after Washington Meeting Holes under investigation: resonator model is justified but probably smaller bandwidth First simulations show no effect of stabilizing rips… ---------------------------------------------------- Input from Collimation-Group has to be followed  Proper design with few updates required. Material data: Vacuum group? We should avoid recalculating the impedance model for every screw that has changed! 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 18

Electron Cloud effects Electron clouds lead to Tune shift / spread Synchronous phase shift Instabilities Pic. by F. Petrov TU-Darmstadt Difference to LHC Syncr. Rad. Asymmetry Small aperture 3D and 2D particle in cell codes for electron cloud simulations community supported beam tracking codes (e.g. PyOrbit) working on coupling the electron cloud simulations to the beam tracking including impedances. 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 19

Scientific Outlook Asymmetry Quadrupolar impedance Combination of impedance and electron cloud Finally impedance check of all components in the ring? Nooo! Rather exclude some devices a priori and make a simplified model.  This is a CDR not a TDR! 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 20

Thank you for your attention! The End Thank you for your attention! 24 April 2017 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 21