1. R&D GOALS AND MILESTONES TOWARDS A TECHNICAL DESIGN REPORT TDR (2008)
First Intnl. Teleconference Ecloud, Impedance/Instabilities - M. Pivi, SLAC 31 October 2006

2. Electron Cloud: Objectives
Characterize electron-cloud build-up
Required for Baseline Priority: Very High
Develop electron-cloud suppression techniques
Develop modeling tools for e-cloud instabilities
Determine electron-cloud instability thresholds

3. Electron Cloud: List of Activities
Characterize electron-cloud build-up
2.2.3.A Model electron cloud instability, Christine Celata, LBNL
2.2.3.C Model electron-cloud build-up and instabilities, Rainer Wanzenberg, DESY
2.2.3.D Model electron-cloud build-up and instabilities, Jim A. Crittenden, Cornell
2.2.3.H Electron cloud studies in DAFNE, Roberto Cimino, INFN-LNF
2.2.3.I CESR-TF wiggler and electron cloud studies, John Byrd, LBNL
2.2.3.M Measurement of electron cloud instabilities, John Flanagan, KEK
2.2.3.N Benchmarking of electron-cloud build-up simulations, Frank Zimmermann, CERN
2.2.3.O Improvement of electron-cloud simulation codes, Frank Zimmermann, CERN
2.2.3.Q Experimental determination of surface parameters for electron-cloud build-up, Frank Zimmermann, CERN
Develop electron-cloud suppression techniques
2.2.3.F Electron cloud lab measurements and PEP-II studies, Mauro T.F. Pivi, SLAC
2.2.3.G Studies of clearing electrodes for suppressing electron cloud build-up, Mauro T.F. Pivi, SLAC
2.2.3.K Studies of grooved vacuum chamber surfaces for electron cloud suppression, Mauro T.F. Pivi, SLAC
2.2.3.L Experiments on suppression of electron cloud effect, Yusuke Suetsugu, KEK
2.2.3.N Benchmarking of electron-cloud build-up simulations, Frank Zimmermann, CERN
Develop modeling tools for electron-cloud instabilities
2.2.3.A Model electron cloud instability, Christine Celata, LBNL
2.2.3.B Model electron-cloud build-up and instabilities, Mauro T.F. Pivi, SLAC
2.2.3.C Model electron-cloud build-up and instabilities, Rainer Wanzenberg, DESY
2.2.3.D Model electron-cloud build-up and instabilities, Jim A. Crittenden, Cornell
2.2.3.E Model electron cloud build-up and instabilities, Kazuhito Ohmi, KEK
2.2.3.M Measurement of electron cloud instabilities, John Flanagan, KEK
2.2.3.R Develop a PIC code for computing electron cloud and ion effects, Warner Bruns, CERN
Determine electron-cloud instability thresholds
2.2.3.P Predict electron-cloud effect in the damping rings, Frank Zimmermann, CERN

4. Electron cloud issues: Milestones
Characterize the electron cloud build-up
Test clearing electrodes
characterize impedance, HOM, power load
Installation of chambers with clearing electrodes in existing machines including dipole and wiggler sections
develop diagnostic
Test groove concepts
characterize impedance, HOM
Installation of fin chambers in existing machines including bend and wiggler sections
Test coating techniques
characterize and test the conditioning in situ in existing machines
Characterize the electron cloud instability threshold
Integrated modeling: cloud, impedance, space charge
Specify techniques for suppressing electron cloud in the ILC DR
Investigate alternative solutions

5. Electron cloud Milestones: Investigators
Characterize the electron cloud build up
There have been significant progress in characterizing the build-up in most areas of the damping rings, and the simulations have been benchmarked and are believed to be reliable. However, there are still uncertainties in the wiggler sections where the electron cloud have a significant impact. Further studies are needed.
wiggler 3D simulations CLOUDLAND, L. Wang
wiggler 3D simulations WARP/POSINST, C. Celata
wiggler experimental studies in CESR, M. Palmer
characterize ecloud in quadrupole, M. Pivi
characterize ecloud in quadrupole, C. Celata
measurements of electron cloud density by RF transmission in PEP-II, j. Byrd
fill pattern as possible mitigation, M. Venturini
compile e-cloud density over the machine, M. Pivi

6. Electron cloud Milestones: Investigators
2. Test clearing electrodes
(a) characterize impedance, HOM, power load
analytical estimates
simulate MAFIA, A. Krasnyhk, Cho Ng
simulate with VORPAL, V. Ivanov (?)
simulate, F. Caspers
simulate, D. Alesini
(b) Installation of chambers with clearing electrodes in existing machines, bend and wigglers
test in HCX in a quadrupole or drift region, A. Molvik
optimize clearing electrode design for bend, L. Wang
test in ESA preliminary to PEPII installation, M. Pivi,
test in PEPII in bend chicane, M. Pivi
optimize clearing electrode design for wiggler, M. Palmer
test in CESR in wiggler section, M. Palmer
test in KEKB arc section bend or wiggler section, Y. Suetsugu
test in LHC arc section bend section, F. Caspers
(c) develop diagnostic
electron cloud diagnostic for test chambers, A. Molvik
electron cloud diagnostic for test chambers, R. Macek

7. Electron cloud Milestones: Investigators
3. Test groove concepts
(a) characterize impedance, HOM
K. Bane numerical estimation, G. Stupakov analytical
(b) Installation of fin chambers in existing machines including bend and wigglers
optimize clearing grooves design, W. Bruns
optimize clearing grooves design, L. Wang
optimize clearing grooves design, M. Venturini
rectangular grooves in drift sections SLAC, M. Pivi
triangular grooves in bend sections SLAC, M.Pivi
triangular grooves in wiggler section CESR, M. Palmer
(c) develop diagnostic
electron cloud diagnostic for test chambers, A. Molvik
electron cloud diagnostic for test chambers, R. Macek

8. Electron cloud Milestones: Investigators
4. Test coating techniques and determine conditioning effectiveness
(a) Secondary electron yield measurements
measuring SEY, Y. Suetsugu
measuring SEY, R. Kirby
measuring SEY, (N. Hilleret)
(b) machine studies
installation of test chambers in KEKB Cu, TiN, NEG, Y. Suetsugu
SEY conditioning test in PEP-II, M. Pivi
Installation of chambers in CESR, M. Palmer
(c) manufacturing and diagnostics
building chambers for installations, S. Marks

9. Electron cloud Milestones: Investigators
5. Characterize the electron cloud instability
Characterize single-bunch instability PEHTS, K. Ohmi
Characterize single-bunch instability HEAD-TAIL, F. Zimmermann
Characterize single-bunch instability quasi-static QUICKPIC, P. Spentzouris
Characterize single-bunch instability in wiggler 3D WARP, C. Celata
Characterize single-bunch instability in lattice CMAD, M. Pivi

10. Electron cloud Milestones: Investigators
6. Integrated modeling
Characterize instability FRAMEWORK, P. Spentzouris

11. Electron cloud Milestones: Timescale
1. Characterize the electron cloud build up
Compile list of electron cloud density in ring by 2007
2. Test clearing electrodes
In PEP-II by 2007
In CESR by 2008
3. Test groove concepts
4. Test coating techniques
In KEKB, by 2007
In PEPII, by 2007
In CESR, by 2008
5. Characterize the electron cloud instability
by TDR
6. Integrated modeling
7. Specify techniques for suppressing electron cloud in the ILC DR

12. Ion Effects: Objectives
Characterize ion effects
Required for Baseline Priority: Very High
Specify techniques for suppressing ion effects

13. Ion issues: List of Activities
Characterize ion effects
2.2.3.R Develop a PIC code for computing electron cloud and ion effects, Warner Bruns, CERN
2.2.4.A Experimental studies of fast ion instability at the LBNL-ALS, John Byrd, LBNL
2.2.4.B Numerical and analytical studies of two-stream (beam-ion) instabilities, Lanfa Wang, SLAC
2.2.4.C Studies of fast ion instability, Kazuhito Ohmi, KEK
2.2.4.D Studies of fast ion instability, Guoxing Xia, DESY
2.2.4.E Studies of fast ion instability, Jim A. Crittenden, Cornell
2.2.4.G Experimental studies of fast ion instability, Lanfa Wang, SLAC
2.2.4.H Measure fast ion instability in KEK-ATF, Junji Urakawa, KEK
2.2.4.I Characterize ion effects in the damping rings, Frank Zimmermann, CERN
Specify techniques for suppressing ion effects
2.2.4.F Studies of suppression techniques for fast ion instability, Lanfa Wang, SLAC

14. Ion effects issues: Milestones and Investigators
To be discussed: set milestones and investigators, examples:
1. Characterize ion effects for the ILC DR
2.2.3.R Develop a PIC code for computing electron cloud and ion effects, Warner Bruns
2.2.4.A Experimental studies of fast ion instability at the LBNL-ALS, John Byrd
2.2.4.B Numerical and analytical studies of two-stream (beam-ion) instabilities, Lanfa Wang
2.2.4.C Studies of fast ion instability, Kazuhito Ohmi
2.2.4.D Studies of fast ion instability, Guoxing Xia
2.2.4.E Studies of fast ion instability, Jim A. Crittenden
2.2.4.G Experimental studies of fast ion instability, Lanfa Wang
2.2.4.H Measure fast ion instability in KEK-ATF, Junji Urakawa
2.2.4.I Characterize ion effects in the damping rings, Frank Zimmermann
2. Test suppression techniques for ion effects
2.2.4.F Studies of suppression techniques for fast ion instability, Lanfa Wang
3. Specify techniques for suppressing ion effects in the ILC DR …

15. Ion effect issues: Timescale
To be discussed: set milestones timescale:
1. Characterize ion effects for the ILC DR
by date …
2. Test suppression techniques for ion effects
3. Specify techniques for suppressing ion effects for the ILC DR