1. ILC DR Workshop - KEK 18-20 December, 2007 1 A new resonance in wiggler simulations: Christine Celata Use POSINST code

2. ILC DR Workshop - KEK 18-20 December, 2007 2 A new resonance in wiggler simulations

3. ILC DR Workshop - KEK 18-20 December, 2007 3 A new resonance in wiggler simulations: Christine Celata

4. ILC DR Workshop - KEK 18-20 December, 2007 4 Build-up simulations in wiggler: Lanfa Wang

5. ILC DR Workshop - KEK 18-20 December, 2007 5 Build-up simulations in wiggler Use CLOUDLAND code

6. ILC DR Workshop - KEK 18-20 December, 2007 6 Secondary emission in grooves: Lanfa Wang

7. ILC DR Workshop - KEK 18-20 December, 2007 7 Instability in Daphne positron ring: Theo Demma

8. ILC DR Workshop - KEK 18-20 December, 2007 8 Build-up simulations for Daphne: Theo Demma Use ECLOUD code

9. ILC DR Workshop - KEK 18-20 December, 2007 9 R. Cimino Frascati Updates on experimental work at Frascati

10. ILC DR Workshop - KEK 18-20 December, 2007 10 Mitigation techniques tests in KEKB: Yusuke Suetsugu

11. ILC DR Workshop - KEK 18-20 December, 2007 11 Mitigation techniques tests in KEKB: Yusuke Suetsugu

12. ILC DR Workshop - KEK 18-20 December, 2007 12 Mitigation techniques tests in KEKB: Yusuke Suetsugu

13. ILC DR Workshop - KEK 18-20 December, 2007 13 Mitigation techniques tests in KEKB: Yusuke Suetsugu

14. ILC DR Workshop - KEK 18-20 December, 2007 14 KEKB for ILC studies, simulation low emittance lattice: Y. Onishi Use SAD code

15. ILC DR Workshop - KEK 18-20 December, 2007 15 KEKB for ILC studies, simulation low emittance lattice

16. ILC DR Workshop - KEK 18-20 December, 2007 16 KEKB for ILC studies, simulation low emittance lattice: Y. Onishi

17. ILC DR Workshop - KEK 18-20 December, 2007 17 Ecloud instability simulations for CesrTA: Jin Hyunchang Use PEHTS code

18. ILC DR Workshop - KEK 18-20 December, 2007 18 Ecloud instability simulations for CesrTA

19. ILC DR Workshop - KEK 18-20 December, 2007 19 Ecloud instability simulations for CesrTA : Jin Hyunchang

20. ILC DR Workshop - KEK 18-20 December, 2007 20 KEKB for ILC, X-ray beam size monitors: John Flanagan

21. ILC DR Workshop - KEK 18-20 December, 2007 21 KEKB for ILC, X-ray beam size monitors: John Flanagan Uniformly Redundant Array (URA) mask

22. ILC DR Workshop - KEK 18-20 December, 2007 22 KEKB for ILC, X-ray beam size monitors: John Flanagan

23. ILC DR Workshop - KEK 18-20 December, 2007 23 Fast Ion Instability at KEK-ATF: N. Terunuma

24. ILC DR Workshop - KEK 18-20 December, 2007 24 Fast Ion Instability at KEK-ATF: N. Terunuma

25. ILC DR Workshop - KEK 18-20 December, 2007 25 Parallel session 1h discussion: Milestones to ILC Engineering Design Report (EDR) and R&D work plans for the EDR

26. ILC DR Workshop - KEK 18-20 December, 2007 26 Milestones to ILC EDR oTest coating techniques and determine conditioning effectiveness in existing accelerator beam lines oSelect coatings in different regions of damping ring: TiN with respect to TiZrV non-evaporable getter NEG oCharacterize thin-film coating durability after long term exposure to beam in operating conditions: analyze PEP-II TiN-chambers after ~10 years operation (Pivi - 09/08) analyze ESRF NEG-chambers (Palmer to give a call to Roberto) wiggler test at KEKB (Suetsugu -09/08) and CesrTA (Palmer - 09/08) oNeed to experimentally characterize Photoemission in ILC DR parameters range to estimate initial electron density (EuroTeV 2009) oCharacterize the electron cloud build-up by simulations and measurements in existing accelerators The goal is to complete the following tasks by early 2010 as input for the Engineering Design Report (EDR)

27. ILC DR Workshop - KEK 18-20 December, 2007 27 Milestones to EDR oModel the electron cloud in wigglers and quadrupoles oCharacterize the electron cloud instability by measurements in existing facilities possibly also at CesrTA, KEKB operating at ultra-low emittancies oModel the ILC DR electron cloud instability by simulations Evaluate the need for Additional Mitigation techniques (besides coating): oTest clearing electrodes in magnetic field regions: in wigglers at KEKB and CESR and in dipoles at PEP-II and SPS oTest triangular groove or slots in magnetic field regions: in wigglers at KEKB and CESR and in dipoles at PEP-II and SPS oCharacterize the impedance and HOMs of mitigation techniques oDecide on use of antechambers and select where they are needed oSpecify electron cloud mitigation requirements for straight, quadrupole, wiggler and bend sections Recommendation of mitigation techniques to prevent the electron cloud in the ILC damping ring as input for the EDR

28. 28 Suggested to have further meeting to discuss the Milestones chart above, include more details and agree upon “who is working on what” at the next electron-cloud WebEx meeting proposed for: Tuesday 15 th January 2008 (6AM SLAC time..)

29. 29 Electron cloud: Milestones (Cornell 2006) 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 (b) machine studies test in HCX in a quadrupole or drift region, A. Molvik test in ESA preliminary to PEPII installation, M. Pivi, test in PEPII in bend chicane, M. Pivi 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 Model for “who is working on what”: that we agreed upon at Cornell Workshop 2006

30. 30 R&D work plans for the EDR From “Damping Rings EDPhase Gantt Links” document On above table: “30. Specify baseline for e-cloud mitigation techniques” is for summer 2008, although experiments on mitigations will be still underway or just started … We decided to start working now on vacuum design and give our best guess at this stage for possible mitigation techniques: coatings, antechamber, grooves, clearing electrodes in each magnetic field region.

31. 31 Bootstrap on recommendation for mitigation and work on vacuum design DR elementAntechamberCoatingMitigationRemarks STRAIGHTYes in arcs and wigglers NEGSolenoid if necessary BENDYesNEGGrooves or Electrodes NEG if good enough for ECE WIGGYesNEGElectrodes or Grooves QUADYes in arcs and wigglers NEGT.b.d. This preliminary table is our best guess at this stage, for colleagues to work on and give their feedback, with the goal to ”Specify baseline for e-cloud mitigation techniques” by the (end of) summer 2008. Notes: TiN is a strong candidate instead of NEG. In STRAIGHTS we are debating the use of grooves and solenoids as additional mitigation.