Presentation is loading. Please wait.

Presentation is loading. Please wait.

Electron Cloud Meeting

Published byAugusta Harrington Modified over 6 years ago

Similar presentations

Presentation on theme: "Electron Cloud Meeting"— Presentation transcript:

1 Electron Cloud Meeting
I. New Utility PESPECT for Optimizing Photoelectron Production Kinematics to Match Shielded Button Measurements -- Reads ECLOUD output and shielded button measurements from multiple sim jobs & measurements -- Optimizes time bin weight function using CERN library MINUIT package Correlates weight function to photoelectron production kinetic energy II. ECLOUD/POSINST comparison for the March 2010 on-axis coherent tune shift measurements All material for this talk, including full sets of the analysis plots, may be obtained at Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences and Education Electron Cloud Meeting 12 May 2010

2 Shielded Button Data 3/16/2010 15E (TiN) 5.3 GeV 8 mA/bunch
Positron beam Electron beam ECLOUD 12.4k macroparticles ECLOUD 39.8k macroparticles For simplicity, PESPECT analyzes the two data sets separately. No optimization, since there are 28 variables for 28 DOF. The positron simulation provides no information for arrival times less than 2 ns (i.e. energies greater than 500 eV). The prompt signal in the electron simulation indicates that there are too many photoelectrons of energy less than 50 eV.

3 PESPECT Calculation of Photoelectron Energy Weight Function
Positron beam Electron beam The positron data shows a dearth of photoelectrons with more than 350 eV The electron data requires more photoelectrons with more than 80 eV.

4 Present Status of ECLOUD modeling of
March 2010 coherent tune shift measurements 4 GeV e+ 1.3 mA/bunch ECLOUD with POSINST input parameters POSINST DLK Presentation 5 May 2010 Modeled tune shifts derived from electric field gradients at the center of the vacuum chamber for on-axis positron beam. ECLOUD calculates a time dependence similar to the on-axis gradients for 4-ns spacing, where ECLOUD and POSINST agree. Understanding the present discrepancy may yield the physical reason for the apparent saturation effect.

Download ppt "Electron Cloud Meeting"

Similar presentations

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

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.

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.

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.

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.

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.

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.

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 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 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 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.
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 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.

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 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.

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.

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 Modeling Cyclotron Resonances in ECLOUD Jim Crittenden Cornell Laboratory.

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.

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 -

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 Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

Similar presentations

Ads by Google