Chicane and Bunch Spacing Scans

Slides:

Advertisements

Similar presentations

KEK Update on the status of the electron cloud studies at KEKB Contents Brief review of our studies Updates Clearing electrode Groove structure SEY measurement.

Advertisements

KEK Recent results of beam tests on clearing electrode and grooves 2010/1/191ILC DR WebEx Meeting Y. Suetsugu, KEK.

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.

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

CesrTA Electron cloud simulation update G. Dugan LCWA09 Damping Ring session 10/1/09 6/18/20151LCWA09.

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

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 Recent Studies with ECLOUD Jim Crittenden Cornell Laboratory for.

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 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 Jim Crittenden Cornell Laboratory for Accelerator-Based Sciences.

Beam dynamics on damping rings and beam-beam interaction Dec 포항 가속기 연구소 김 은 산.

ILC08 Chicago November 2008 Summary of Recent Results from SLAC M. Pivi, J. Ng, D. Arnett, G. Collet, T. Markiewicz, D. Kharakh, R. Kirby, F. Cooper,

APS RFA studies and modeling: Findings vs. open issues

CesrTA EC Build-Up and Mitigation Program - Introduction Mark Palmer June 25, 2009.

Electron Cloud Mitigation Studies at CesrTA Joseph Calvey 10/1/2009.

Motivation and Overview David Rubin Cornell Laboratory for Accelerator-Based Sciences and Education.

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.

Recent Electron-Cloud Mitigation Studies at KEK E-cloud mitigation mini-workshop on November at CERN Kyo Shibata (for KEKB Group)

LCWA09 – October 1 st S. De Santis Measurements of the Electron Cloud Density by TE wave propagation in Cesr-TA M. Billing, J. Calvey, B. Carlson, S. De.

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

CesrTA Status Report Mark Palmer Cornell University September 2, 2009.

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 measurement in Cu/Al chambers with/without TiN coating at KEKB positron ring ILC DR Working Group Meeting Kyo Shibata (KEK)

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

Electron cloud study for ILC damping ring at KEKB and CESR K. Ohmi (KEK) ILC damping ring workshop KEK, Dec , 2007.

Updates of EC Studies at KEKB 1.EC studies at KEKB 2.Recent results 1.Clearing Electrode 2.Groove surface 3.TiN coating 4.Measurement of EC in solenoid.

Electron cloud measurements in Cesr-TA during the July-August run for the SPSU Study Team, report by S. Calatroni and G. Rumolo thanks to J.

2007/03/1-2 ECL2, CERN 1 SEY and Clearing Studies at KEKB Contents Contents Introduction Studies Beam duct with Ante-chambers Coatings with Low SEY Clearing.

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

Recent Studies on Electron Cloud at KEKB 1.EC studies at KEKB 2.Recent results –Clearing Electrode –Groove surface –EC measurement in Q and solenoid field.

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

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

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

Electron Cloud Measurement Summary for the April 2014 Run

Groove Mitigation and Plans

Mark Palmer for the CESRTA Collaboration

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

Using Time-Resolved Retarding Field Analyzer Measurements to Determine the SEY Mitigation Effectiveness of Grooves -- Bonus: first look at last night's.

8-12 October 2010 at Cornell University

CLIC Damping ring beam transfer systems

e- Cloud Machine Studies-Tune Shift Studies

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

Detailed Characterization of Vacuum Chamber Surface Properties Using Measurements of the Time Dependence of Electron Cloud Development Jim Crittenden.

RECENT DEVELOPMENTS IN MODELING

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.

Shielded Button Measurement/ECLOUD Simulation Comparison for 5

Electron Cloud Meeting

Why Study Electron Clouds? Methods and Tools to Study Electron Clouds

J.A.Crittenden, Y.Li, X.Liu, M.A.Palmer, J.P.Sikora (Cornell)

All material for this talk may be obtained at

Studies of Electron Cloud Growth and Mitigation at CESR-TA

CESRTA Measurement of Electron Cloud Density by TE Wave and RFA

Code Benchmarking and Preliminary RFA Modelling for CesrTA

Status of Ecloud Build-Up Simulations for the ILC DR’s

CesrTA Experimental Schedule and Priorities

Electron cloud studies at CESR

Electron Cloud Build-up in ilcDR

CesrTA Wiggler RFA Measurements

CTA 09 - Introduction David Rubin Cornell Laboratory for

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

Presentation transcript:

Chicane and Bunch Spacing Scans Joe Calvey 6/17/09 1 1 1

Chicane Scans We have chicane scan data at: 2 and 5 GeV 4ns and 8ns 4 ns plots for a train of 45 positron bunches, .75 mA/bunch 8 ns plots for a train of 45 positron bunches, 1 mA/bunch Plots show collector 1 (edge) and collector 9 (center)‏ 2

4ns, 2 GeV TiN, Collector 1 TiN, Collector 9 Al, Collector 1 3 3

4ns, 5 GeV TiN, Collector 1 TiN, Collector 9 Al, Collector 1

8ns, 2 GeV TiN, Collector 1 TiN, Collector 9 Al, Collector 1 5 5

8ns, 2 GeV, detail TiN, Collector 1 TiN, Collector 9 Al, Collector 1 6 6

TiN TiN, Detail Al Al, Detail 7

8ns, 5 GeV TiN, Collector 1 TiN, Collector 9 Al, Collector 1

Chicane Scan Observations 8 ns data has huge enhancement at n=20 resonance n = 21 also big, but not much Note: TiN RFA 3 (next to Al chamber) also sees some extra current there but TiN RFA 2 (not shown) does not Electrons leaking from RFA 4? 5 GeV data has spike at low current RFA efficiency issue? Density higher in drift?

Large Bunch Spacing Energy Scans Dominated by primary photoelectrons 43 bunches, 56ns separation, .8mA/bunch 2 GeV shown (we also have 5 GeV)‏ Data taken with all (22!) RFAs around ring Chicane field = 860 Gauss

TiN Wiggler, Pole Center Cu Wiggler, Pole Center TiN Wiggler, Pole Center Drift (downstream of wigglers)‏ Drift (upstream of wigglers)‏ 11

Dipole 13W Chicane RFA2 (TiN)‏ Chicane RFA3 (TiN)‏ Chicane RFA4 (Al)‏ 12

Energy Scans with Varying Bunch Spacing We have data from all RFAs at 4, 8, 12, 16, and 20ns bunch spacing In general bunch spacing does not seem to have a huge effect on RFA response We have not examined this thoroughly It does have an interesting effect on the center pole wiggler RFAs Becomes more prominent with higher bunch currents “Trampoline” effect? Data shown is for a 45 bunch positron beam at 1.25 mA/bunch, 5 GeV Wiggler pole center RFA, center collector

“Trampoline” Effect? 4ns 8ns 12 ns 20 ns 14 14