45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD Simulations for the Tune Shift Measurements of 19-20 December.

Slides:

Advertisements

Similar presentations

Electron cloud tune shift measurements for long trains Tune Shift versus current: Measured the tune shift for 45 and 115 bunch positron trains with 14ns.

Advertisements

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

RedOffice.com Presentation templates Slide No. 1 RFA Detector Data of Electron Cloud Build-up and Simulations Eric Wilkinson Mentor: Jim Crittenden Cornell.

Using Tune Shifts to Evaluate Electron Cloud Effects on Beam Dynamics at CesrTA Jennifer Chu Mentors: Dr. David Kreinick and Dr. Gerry Dugan 8/11/2011REU.

Comparison of ECLOUD and POSINST Calculations of Coherent Tune Shifts with Emphasis on the Relative Drift and Dipole Contributions Jim Crittenden Cornell.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden & John Sikora Cornell Laboratory for Accelerator-Based.

ECLOUD Calculations of Field Gradients During Bunch Passage Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud.

LEPP, the Cornell University Laboratory for Elementary-Particle Physics, has joined with CHESS to become the Cornell Laboratory for Accelerator-based Sciences.

Early Results on a Search for Cyclotron Resonances in ECLOUD -- Collaboration with Eric Wilkinson -- These slides includes corrections arising from the.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Resolution of ECLOUD Tune Shift Calculation Instability Jim Crittenden.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Modelling Cyclotron Resonances in ECLOUD 1) Comparison with CesrTA.

ECLOUD Calculations of Coherent Tune Shifts for the April 2007 Measurements - Study of SEY Model Effects - Jim Crittenden Cornell Laboratory for Accelerator-Based.

Comparison of Primary Photoelectron Generation in ECLOUD, CLOUDLAND and POSINST Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

ECLOUD Calculations of Coherent Tune Shifts for the April 2007 Measurements - Study of SEY Model Effects - Jim Crittenden Cornell Laboratory for Accelerator-Based.

ECLOUD Calculations of Coherent Tune Shifts for the April 2007 and January 2009 Measurements - Preparation for PAC2009 FR5RF Paper and Poster - “Effects.

LEPP, the Cornell University Laboratory for Elementary-Particle Physics, has joined with CHESS to become the Cornell Laboratory for Accelerator-based Sciences.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Preliminary Results on the Introduction of the Rediffused SEY Component.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Modeling Cyclotron Resonances in ECLOUD Jim Crittenden Cornell Laboratory.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Comparison of ECLOUD Calculations in Dipole and Quadrupole Fields.

ECLOUD Calculations of Coherent Tune Shifts for the April 2007 Measurements - This presentation limited to resolving drift/dipole weighting question -

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Recent Studies with ECLOUD Jim Crittenden Cornell Laboratory for.

ElectronsdFud Simulation Work at Cornell Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

Space Charge Electric-Field Calculations for Coherent Tune Shift Estimations using the Electron-cloud Modelling Algorithm ECLOUD Jim Crittenden Cornell.

ECLOUD Calculations of Coherent Tune Shifts for the April 2007 Measurements - Thanks to Marco for clarifying the drift/dipole weighting - - Thanks to Gerry.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Electron Cloud Simulation Studies for CesrTA Jim Crittenden Cornell.

21 December 2009 ECLOUD Simulations for Measurements of December 2009 / J.A.Crittenden 1/1 ECLOUD Simulations for Measurements of 19/20 December.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD Simulations for the Tune Shift Measurements of December.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Comparison of ECLOUD Calculations in Dipole and Quadrupole Fields.

ECLOUD Simulations for CESR Witness Bunch Tune Shift Measurements Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

CESR Synchrotron Radiation Tables and Electron Cloud Modelling Input Parameters Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York First Results on the Introduction of the Rediffused SEY Component.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York CesrTA Electron Cloud Measurements and Simulations Jim Crittenden.

49th ICFA Advanced Beam Dynamics Workshop October 8 –12, 2010 LEPP, the Cornell University Laboratory for Elementary-Particle Physics, has joined with.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD News 1) Bug in SEY model fixed 2) List of present activities.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

Witness Bunch Experimental Studies at CESR-TA Robert Holtzapple Alfred University/Cal Poly San Luis Obispo.

Cesr-TA Simulations: Overview and Status G. Dugan, Cornell University LCWS-08.

Electron cloud measurements and simulations at CesrTA G. Dugan, Cornell University 4/19/09 TILC09 4/18/09.

November 18, 2011David L. Rubin1 CESR Test Accelerator – Investigation of the physics of charged particle beams Circumference = 768m - Beam energy

Shielded-Pickup Measurements in June and Update on Modeling Results / J.A. Crittenden 23 August / 4 Shielded-Pickup Measurements in June and Update.

CesrTA Electron cloud simulation update ILC 10 Workshop G. Dugan, Cornell 3/28/09 2/24/2016ILC 10 Workshop.

Electron cloud beam dynamics G. Dugan, Cornell University CesrTA Advisory Committee 9/11/12.

RFA Simulations Joe Calvey LEPP, Cornell University 6/25/09.

Observations and Predictions at CesrTA, and outlook for ILC G. Dugan, on behalf of M. Billing, K. Butler, J. Crittenden, M. Forster, D. Kreinick, R. Meller,

Observations of Electron Cloud Phenomena at PETRA III Presentation at the ECLOUD 2012 workshop Rainer Wanzenberg ECLOUD 2012 June 5-8, 2012 Hotel Hermitage.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden & John Sikora Cornell Laboratory for Accelerator-Based.

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

Status of ECLOUD Simulations for the Shielded Button Measurements

Update to ECLOUD Calculations for the

Electron Cloud Measurement Summary for the April 2014 Run

Electron Cloud R&D at Cornell ILCDR08--7/8/08

e- Cloud Machine Studies-Tune Shift Studies

Electron Cloud Meeting

Physics Scope and Work Plan for the Shielded-Pickup Measurements -- Synchrotron Radiation Photon Distributions Photoelectron Production Parameters.

First Look at the New SYNRAD3D Results

RECENT DEVELOPMENTS IN MODELING

Physics Scope and Work Plan for the Shielded-Pickup Measurements -- Synchrotron Radiation Photon Distributions Photoelectron Production Parameters.

First Look at Modeling Photoelectron Energy Distribution for a 2

Shielded Button Measurement/ECLOUD Simulation Comparison for 5

Electron Cloud Meeting

First Attempt to Simulate the Shielded Button Measurements with ECLOUD

Quadrupole Shielded-Pickup Data Comparison of Signals from 10- and 20-Bunch e+ Trains -- Trapping ! Updated after meeting to include suggested.

All material for this talk may be obtained at

Recent Electron Cloud Studies at CESR and Future Plans

CTA 09 - Introduction David Rubin Cornell Laboratory for

Presentation transcript:

45 th ICFA Beam Dynamic Workshop June 8–12, 2009, Cornell University, Ithaca New York ECLOUD Simulations for the Tune Shift Measurements of December 2009 Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Meeting 6 January , 20-, 45-bunch trains with 34 mA total current 4-, 8-, 12-ns bunch spacing Includes comparison to June 2009 measurements with 4-ns spacing for which POSINST calculations are available 13 Jan 2010: Added comparison to December 2009 measurements with 4-ns spacing

6 January 2010 ECLOUD Simulations for Measurements of December 2009 / J.A.Crittenden 2/6 ECLOUD Simulations for Measurements of 10 June 2009 CTA_2085MEV_ , 32-bunch train, 4-ns spacing, 0.8 mA/bunch Black: Horizontal tune shifts e+ 1.3x10 10 /bunch, 2.1 GeV Red: nominal simulation parameters (SEY=2.0) Blue: SEY=2.2 The POSINST and ECLOUD field gradient calculations are consistent with each other. Each underestimates the horizontal tune shift. POSINST (Gerry) Electron cloud meeting 6/17/2009 ECLOUD

6 January 2010 ECLOUD Simulations for Measurements of December 2009 / J.A.Crittenden 3/6 ECLOUD Simulations for Measurements of 19/20 December 2009 CTA_2085MEV_ , 4-ns spacing, 34 mA total current Compare to 32-bunch, 4-ns spacing, 0.8 mA/bunch measurements of June 2009 Positron beamElectron Beam 45 bunch train 0.75 mA/bunch 20 bunch train 1.7 mA/bunch 10 bunch train 3.4 mA/bunch Remarkable variety in positron tune shifts. Electron tune shifts negligible.

6 January 2010 ECLOUD Simulations for Measurements of December 2009 / J.A.Crittenden 4/6 ECLOUD Simulations for Measurements of 19/20 December 2009 CTA_2085MEV_ , 8-ns spacing, 34 mA total current Compare to 32-bunch, 4-ns spacing, 0.8 mA/bunch measurements of June 2009 Positron beamElectron Beam 45 bunch train 0.75 mA/bunch 20 bunch train 1.7 mA/bunch 10 bunch train 3.4 mA/bunch Remarkable variety in positron tune shifts also for 8-ns spacing, including sign change.

6 January 2010 ECLOUD Simulations for Measurements of December 2009 / J.A.Crittenden 5/6 ECLOUD Simulations for Measurements of 19/20 December 2009 CTA_2085MEV_ , 12-ns spacing, 34 mA total current Compare to 32-bunch, 4-ns spacing, 0.8 mA/bunch measurements of June 2009 Positron beamElectron Beam 45 bunch train 0.75 mA/bunch 20 bunch train 1.7 mA/bunch 10 bunch train 3.4 mA/bunch The results for 12-ns spacing give information on how the 14-ns data is likely to behave.

6 January 2010 ECLOUD Simulations for Measurements of December 2009 / J.A.Crittenden 6/6 ECLOUD Simulations for Measurements of 19 December 2009 CTA_2085MEV_ , 4-ns spacing, 45 mA total current Compare to 45-bunch, 4-ns spacing, 0.75 mA/bunch measurements of December 2009 New record for horizontal tune shift: 25 kHz ! ECLOUD factor two underestimate for D Q x similar to that observed for the June 2009 measurements for both ECLOUD and POSINST. Apparently no vertical excitation of the beam, so no vertical tune measurement.