LHC at 7 TeV/c: comparison phase 1 / IR3MBC

Slides:

Advertisements

Similar presentations

SPS impedance work in progress SPSU meeting August 11 th 2011.

Advertisements

Longitudinal instabilities: Single bunch longitudinal instabilities Multi bunch longitudinal instabilities Different modes Bunch lengthening Rende Steerenberg.

Impedance of SPS travelling wave cavities (200 MHz) A. Grudiev, E. Métral, B. Salvant, E. Shaposhnikova, B. Spataro Acknowledgments: Erk Jensen, Eric Montesinos,

Beam pipe impedance vs. Frequency 22 July 2015 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Uwe Niedermayer | 1 An artifact,

Elias Métral, 1st ICE meeting, 14/07/2010 /191 STATUS OF THE LHC INSTABILITIES E. Métral, N. Mounet and B. Salvant E. Métral, N. Mounet and B. Salvant.

1 Impedance and its link to vacuum chamber geometry T.F. Günzel Vacuum systems for synchrotron light sources 12 th september 2005.

Particle Studio simulations of the resistive wall impedance of copper cylindrical and rectangular beam pipes C. Zannini E. Metral, G. Rumolo, B. Salvant.

Impedance aspects of Crab cavities R. Calaga, N. Mounet, B. Salvant, E. Shaposhnikova Many thanks to F. Galleazzi, E. Metral, A. Mc Pherson, C. Zannini.

AB-ABP/LHC Injector Synchrotrons Section CERN, Giovanni Rumolo 1 Final results of the E-Cloud Instability MDs at the SPS (26 and 55 GeV/c) G.

Elias Métral, APC meeting, 02/02/2006 1/35 E. Métral, G. Arduini and G. Rumolo u Observations of fast instabilities in the SPS (1988 and 2002/3) and PS.

Beam observation and Introduction to Collective Beam Instabilities Observation of collective beam instability Collective modes Wake fields and coupling.

LSWG day: Impedance and beam induced heating Nicolas Mounet *, Daria Atapovych, Nicolò Biancacci, Elias Métral, Tatiana Pieloni, Stefano Redaelli, Benoit.

Status of the SPS impedance model C. Zannini, G. Rumolo, B. Salvant Acknowledgments: H. Bartosik, O.Berrig, G. Iadarola, E. Métral, N. Mounet, V.G. Vaccaro,

Update of the SPS transverse impedance model Benoit for the impedance team.

Update of the SPS transverse impedance model C. Zannini, G. Rumolo, B. Salvant Acknowledgments: H. Bartosik, O.Berrig, F. Caspers, E. Chapochnikova, G.

Elias Métral, LHC Beam Commissioning Working Group meeting, 08/06/2010 /191 SINGLE-BUNCH INSTABILITY STUDIES IN THE LHC AT 3.5 TeV/c Elias Métral, N. Mounet.

Status from the collimator impedance MD in the LHC Collimation team:R. Assmann, R. Bruce, A. Rossi. Operation team:G.H. Hemelsoet, W. Venturini, V. Kain,

11 Update of the SPS impedance model G. Arduini, O. Berrig, F. Caspers, A. Grudiev, E. Métral, G. Rumolo, B. Salvant, E. Shaposhnikova, B. Spataro (INFN),

Injection Energy Review D. Schulte. Introduction Will review the injection energy So could answer the following questions: Which injection energy can.

Elias Métral, ICFA-HB2004, Bensheim, Germany, 18-22/10/ E. Métral TRANSVERSE MODE-COUPLING INSTABILITY IN THE CERN SUPER PROTON SYNCHROTRON G. Arduini,

Instability rise-time far above the TMCI threshold: Comparison between simple theory, MOSES and HEADTAIL E. Benedetto, E. Metral Acknowledgements: G. Rumolo,

Example: Longitudinal single bunch effects Synchrotron tune spread Synchrotron phase shift Potential well distortion Energy spread widening (microwave.

Elias Métral, SPSU Study Group and Task Force on SPS Upgrade meeting, 25/03/2010 /311 TMCI Intensity Threshold for LHC Bunch(es) in the SPS u Executive.

News on TMCI in the SPS: Injecting high intensity bunches Benoit for the MD team: T. Bohl, K. Cornelis, H. Damerau, W. Hofle, E. Metral, G. Rumolo, B.

Elias Métral, LHC Beam Commissioning Working Group meeting, 30/11/2010 /241 PRELIMINARY FINDINGS FROM INSTABILITY MEASUREMENTS DURING THE 75ns AND 50ns.

1 Update on the impedance of the SPS kickers E. Métral, G. Rumolo, B. Salvant, C. Zannini SPS impedance meeting - Oct. 16 th 2009 Acknowledgments: F. Caspers,

A first glance at the impedance of an SPS collimation system Nicolas Mounet, Benoit Salvant, Carlo Zannini Acknowledgments: collimation team (Daniele,

Three examples of application of Sussix 1)Data from simulations  sensitivity 2)Data from measurements  frequency resolution.

Elias Métral, LIS meeting, 29/01/2008 1/26 GAMMA TRANSITION JUMP FOR PS2 W. Bartmann, M. Benedikt, E. Métral and D. Möhl u Introduction with the case of.

Benchmarking Headtail with e-cloud observations with LHC 25ns beam H. Bartosik, W. Höfle, G. Iadarola, Y. Papaphilippou, G. Rumolo.

1 Transverse single-bunch instabilities in the CERN SPS and LHC Benoit Salvant for the impedance team: Gianluigi Arduini, Theodoros Argyropoulos, Mike.

Pros and Cons of the 200 MHz System G. Iadarola, K. Li, E. Metral, G. Rumolo Thanks to: L. Medina, J. Esteban Mueller, B. Salvant, E. Shaposhnikova, R.

HEADTAIL simulation during the accelerating ramp in the PS S. Aumon - EPFL & CERN Acknowledgement to B. Salvant, G. Rumolo.

Elias Métral, CERN-GSI bi-lateral working meeting on Collective Effects – Coordination of Theory and Experiments, GSI, 30-31/03/06 1/15 TRANSVERSE LANDAU.

XXIII European Synchrotron Light Source Workshop, November 2015 Eirini Koukovini-Platia Diamond Light Source Collective effects at Diamond Experimental.

Feasibility of impedance measurements with beam N. Biancacci, N. Wang, E. Métral and B.Salvant COLUSM meeting 27/05/2016 Acknowledgements: A. Lafuente.

Beam Instability in High Energy Hadron Accelerators and its Challenge for SPPC Liu Yu Dong.

Cryo Problem MD Planning Tue (1.11.) C B Day Time MD MP Tue 01:00

Longitudinal impedance of the SPS

Session 5: Instability Modeling, Observations and Cures

The HEADTAIL Development Working Group (HDWG)

Follow up on SPS transverse impedance

Proposals for 2015 impedance-related MD requests for PSB and SPS

A. Al-khateeb, O. Chorniy, R. Hasse, V. Kornilov, O. Boine-F

MD2490 Measurement of the TMCI threshold at flat-top

Benchmarking the SPS transverse impedance model: headtail growth rates

A.KOLOMIETS & A.KOVALENKO

MD2490: Measurement of the TMCI Threshold at Flat-Top

News on the TMCI and SPS transverse impedance

Invited talk TOAC001 ( min, 21 slides)

G. Arduini, R. Calaga, E. Metral, G. Papotti, G. Rumolo, B. Salvant, R

E. Metral, G. Rumolo, B. Salvant, C. Zannini (CERN – BE-ABP-LIS)

E. Métral, G. Rumolo, R. Tomás (CERN Switzerland), B

Status from the collimator impedance MD in the LHC

impedance aspects for the beam screen

Tune shifts in LHC from collimators impedance

CERN / GSI Meeting on Collective Effects in CARE-HHH APD BEAM’07

W. Bartmann, M. Benedikt, E. Métral, D. Möhl, G. Rumolo and B. Salvant

LHC impedance: Comparison between phase 1 and IR3MBC – follow-up

News on TMCI in the SPS: Injecting high intensity bunches

Some results on the LHC multibunch modes at 7 TeV/c

Impedance analysis for collimator and beam screen in LHC and Resistive Wall Instability Liu Yu Dong.

Simulating transition crossing in the PS with HeadTail

Status of Impedance studies

CERN-SPS horizontal instability

LHC collimation review follow-up Impedance with IR3MBC option & comparison with phase 1 tight settings N. Mounet, B. Salvant and E. Métral Acknowledgements:

TMCI for LHC collimators (very preliminary results)

EM simulations of the LHC beam screens including the weld

Two beam coupling impedance simulations

ESRF Experimental Contribution Towards Working Group Introduction

Presentation transcript:

LHC at 7 TeV/c: comparison phase 1 / IR3MBC N. Mounet, B. Salvant and E. Métral First comparison between phase 1 and IR3MBC (combined momentum and betatron cleaning in IR3 – settings from A. Rossi) !! Preliminary results !! (some effects, such as temperature, not taken into account) N. Mounet, B. Salvant and E. Métral - ICE meeting - 15/09/2010

Better in horizontal, but… Reminders: Coupled-bunch modes from all the machine elements in the model (Collimators + MBWs/MQWs magnets + beam screens + warm pipe + broad band) – from dipolar impedance Better in horizontal, but… N. Mounet, B. Salvant and E. Métral - ICE meeting - 15/09/2010

BUT this is supposed to be damped by transverse feedback. Reminders: Coupled-bunch modes from all the machine elements in the model (Collimators + MBWs/MQWs magnets + beam screens + warm pipe + broad band) – from dipolar impedance … worse in vertical. BUT this is supposed to be damped by transverse feedback. Now, is the real part of the tune shift an issue (for transverse mode coupling instability - TMCI - threshold) ? N. Mounet, B. Salvant and E. Métral - ICE meeting - 15/09/2010

Vertical coupled-bunch modes from all the machine elements in the model – from dipolar + quadrupolar impedance In multibunch, the actual tune shift to be observed in the machine is lower in IR3MBC w.r.t phase 1. → Due to compensation between quadrupolar and dipolar impedances for the most critical horizontal collimators. The same kind of compensation occurs for single-bunch tune shift (-2e-4 in vertical, vs -3e-4 in phase 1) so no TMCI issue ? N. Mounet, B. Salvant and E. Métral - ICE meeting - 15/09/2010

Headtail simulations for single-bunch TMCI threshold IR3MBC - vertical Phase 1 - horizontal The TMCI threshold seems to be 1.7e11 p/bunch in IR3MBC (in vertical) vs 3.4e11 p/bunch in phase 1 (in horizontal). In IR3MBC, it is due to a coupling between m=0 and m=-1 headtail mode, the m=-1 mode being shifted positively strange results, but if true, we don’t have any more margin for ultimate intensity … N. Mounet, B. Salvant and E. Métral - ICE meeting - 15/09/2010