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

Slides:

Advertisements

Similar presentations

BUILD-UP SIMULATIONS FOR DAFNE WIGGLER W/ ELECTRODES Theo Demma.

Advertisements

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.

CESR Synchrotron Radiation Tables - Range of Photon Rates and Beta-averaged Photon Rates - Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

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.

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.

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

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.

Electron Cloud in ilcDR: Update T. Demma, INFN-LNF.

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.

Title Date Author for the C ESR TA Collaboration.

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.

The Secondary Electron Yield Model in ECLOUD and Comparison to CLOUDLAND Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education.

1 Electron Cloud Cyclotron Resonances for Short Bunches in a Magnetic Field * C. M. Celata a, Miguel A. Furman, J.-L. Vay, and Jennifer W. Yu b Lawrence.

1 CERN 1 Mar E-CLOUD Build-up in Grooved Chambers Marco Venturini Center for Beam Physics, LBNL ECL2 -- CERN, 1-2 March 2007.

Electron cloud in the wigglers of ILC Damping Rings L. Wang SLAC ILC Damping Rings R&D Workshop - ILCDR06 September 26-28, 2006 Cornell University.

Highlights from the ILCDR08 Workshop (Cornell, 8-11 July 2008) report by S. Calatroni and G. Rumolo, in CLIC Meeting Goals of the workshop:

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

2nd International Particle Accelerator Conference September 4–9, 2011, San Sebastián, Spain LEPP, the Cornell University Laboratory for Elementary-Particle.

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

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.

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

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

Use of the Shielded-Pickup Measurements for Optimization of the Photoelectron Production Energy Distribution in ECLOUD -- This topic was included in the.

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

Electron Cloud Meeting

Jim Crittenden Electron Cloud Meeting 4 December 2013

Ryan Badman Jim Crittenden July 20, 2011 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

Electron Cloud in ilcDR: Update

45 e+ bunches, 4-ns spacing, 0.9 mA/bunch

Presentation transcript:

Early Results on a Search for Cyclotron Resonances in ECLOUD -- Collaboration with Eric Wilkinson -- These slides includes corrections arising from the discussion during the presentation. Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Simulations Meeting Wilson Lab 17 June 2009

2/4 17 June 2009 Inspired by June 2009 Measurements Early Results on a Search for Cyclotron Resonances in ECLOUD/ J.A.Crittenden These resonances were not easy to find ! Resonant enhancement much smaller than the factor 2-3 calculated by POSINST for the PEP-II case. NB: The v.c. is actually round (3.5 inch ID) and  max = 1.4 is unrealistically small for Al. 9 cm x 5 cm elliptical v.c.  p.e./e +  100% reflectivity  max = 1.4 E peak = 195 eV I b = 2E10 e + /bunch (1.25 mA)

3/4 17 June 2009 E peak = 195 eV --> 310 eV Early Results on a Search for Cyclotron Resonances in ECLOUD/ J.A.Crittenden Resonance remains for lower SEY. Reminder: POSINST modelling for PEP-II found narrow minima rather than maxima at n=1,3. The cloud may not be reaching saturation for 4 ns spacing.  9 cm x 5 cm elliptical v.c.  p.e./e +  100% reflectivity  max = 1.4 E peak = 310 eV I b = 2E10 e + /bunch (1.25 mA)

4/4 17 June 2009 I b = 2E10 --> 1E10 (1.25 mA --> mA) Early Results on a Search for Cyclotron Resonances in ECLOUD/ J.A.Crittenden Reducing the bunch charge may provide saturation at 4 ns spacing. Resonant enhancement appears to remain.  9 cm x 5 cm elliptical v.c.  p.e./e +  100% reflectivity  max = 1.4 E peak = 310 eV I b = 1E10 e + /bunch (1.25 mA)