1. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 1 Report on special ATF2 meeting held to “kick- off” France participation in ATF2. Held at LAPP, Annecy, France 9-11 Oct 2006 Cherrill Spencer, SLAC Member of ATF2 Magnet Team

2. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 2 Purpose and main topics of meeting The purpose of this meeting is to discuss the participation in the ATF2 project of the three IN2P3 groups at LAL-Orsay, LAPP-Annecy and LLR- Polytechnique, following approval and initial funding by the newly created French research funding agency ANR (Agence Nationale de la Recherche). The topics covered are –beam tuning/optimization and participation in the commissioning, –GEANT4 modeling of the beam line and simulations to estimate backgrounds from beam losses, – support and active stabilization of the final doublet and equipment, –related beam instrumentation, – porting of results to the final focus of a linear collider and analysis of impact. The meeting agenda will revolve around these topics to review the current activities and status in each, and help orient and integrate the starting IN2P3 effort. ALL TALKS in the 3 day meeting CAN BE FOUND HERE: http://ilcagenda.cern.ch/conferenceDisplay.py?confId=1176 This report concentrates on the magnets for the final doublet region.

3. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 3 Main participants in the meeting. Plus 6 others by phone or in person Andrea Jeremie (LAPP) Philip Bambade (Orsay) T. Tauchi (KEK) J. Urakawa (KEK) R. Sugahara (KEK) T. Kume (KEK) James Jones (ASTEC, UK) Frank Zimmerman (CERN) Cherrill Spencer (SLAC)

4. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 4 Most of the visitors at the meeting (another good French dinner)

5. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 5 A French way of cooking meat (we need chopsticks they said!)

6. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 6 View of lake Annecy and lower Alps from LAPP conference room

7. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 7 13 th century prison in old Annecy

8. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 8 “CLIC” table on loan to LAPP

9. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 9 Special foot of the stabilization table– this is the active part

10. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 10 Suggested spacing of 2 quads & 2 sextupoles on special CLIC table 26 Sept 06 NOTE: 450mm is QD0 core length. Overall length = 546.1mm. BPM fits at one end only. At other end coils, fittings & terminals stick out 72.5mm. FD quads, QD0, QF1 using old FFTB quad “QC- 3” style. Quad bore value under discussion- will be less than 60mm Sextupoles being designed. Bore ?

11. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 11 Suggested spacing of 2 quads & 2 sextupoles on special CLIC table 26 Sept 06 NOTE: 450mm is QD0 core length. Overall length = 546.1mm. BPM fits at one end only. At other end coils, fittings & terminals stick out 72.5mm. FD quads, QD0, QF1 using old FFTB quad “QC- 3” style. Quad bore value under discussion- will be less than 60mm Sextupoles being designed. Bore ?

12. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 12 Close-up of QC3 Mover showing LVDT parts not shown on installation drawings These 3 position sensors and their supports, not shown on main installation drawing. LVDT=Linear Variable Differential Transformer

13. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 13 New Magnets Being Made for the ATF2 part 2/4 Two final doublet quads: QD0, QF1,being fabricated by enlarging bore of 2 existing quads of the FFTB “QC-3” style. –Remaining question I’d like agreement on today: size of enlarged bore. As explained in my Monday 9 th October talk I’d like to make new bore 49mm in diameter. –Will work on disassembly, EDM’ing poletips, re-assembly and magnetic measurements between now and March 2007.

14. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 14 New Magnets Being Made for the ATF2 part 3/4 Five new sextupoles are needed: 3 in the FF: SD4, SF5 and SF6 and 2 in the “final doublet” (interleaved with final 2 quads): SF1 and SD0. Considerations of available Z space and height of ATF2 beam lead us to make new and different designs for the FF and FD sextupoles. SF1 & SD0: –will have (large) S-band BPMs attached to their core –their bore should match the QD0/QF1 bore (= 49mm) –Cores can be somewhat longer than 90mm –their cores may need to fit in with a wider FFTB mover than the “QMAG” style & must put bore at 1.2m from floor

15. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 15 New Magnets Being Made for the ATF2 part 4/4 FF sextupoles: another new design needs to be made with these features: –Bore to be same as adjacent QEA quads: 32 mm diameter –Coil end shape to be compatible with a C-band BPM –Core to be ~90mm long (OK with a 32 mm bore) –Bottom of core to be flat, to sit directly on a “QMAG” mover T plate. Distance between core bottom and bore center to be 295mm –Vertical distance between bottom of T plate (under a mover) and magnet bore center to be 541 mm. Will be over 7 months from now (at earliest) before 5 sextupoles are designed, made and measured.

16. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 16 Two important questions about the FD magnets for ATF2 we considered Question #1. Will the 4 FD magnets and their S band BPMs fit on the CLIC table?- overall length is the issue. Answer #1. Yes (Okugi analysis of layout). Question #2. Can they have FFTB magnet movers under them and have centers of their apertures match the 1.2m beam height off ATF2 floor? Answer #2. A new very short support has been designed that fits under the FD quads’ movers’ T plate and puts bore center at 1.2 m (see Nicolas Geffroy presentation this workshop 11 Oct 06)

17. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 17 What SLAC equipment LAPP needs to thoroughly test the CLIC table A QC3 quad: Spencer is negotiating with SABER project group at SLAC who suddenly think they might need the 3 rd QC3 quad ( we know where it is stored at SLAC). Could lend it to LAPP until Feb 2007, maybe longer. The QC3-style FFTB mover (=wider T plate) to go under the borrowed QC3 quad. Three other FFTB movers Electronics and cables to run the 4 movers 2 Streckeisen “STS2” sensors: Spencer to enquire at SLAC

18. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 18 Electronics & cables to control FFTB movers. Need 2 crates to control 16 movers Back and front of stepper motor resistor chassis Interface between controller and stepper motors

19. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 19 27.05 cm 5.59 cm 32.64 cm (40.64 - 8) 3.05 cm 5 New design for wide mover support by N. Geffroy, LAPP. With two possibilities for height adjustment - Very accurate base plate thickness for desired magnet height. - Use of spacer to adjust magnet height / inclination

20. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 20 T-1 plate for QC-3, sits under FFTB mover. We have only one QC-3 T plate: for QF1 609.6 mm WIDE 482.6mm LONG Need to make at least one more wide T plate for QD0. If FD sextupoles width demands it will need 2 additional wide T plates for them.

21. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 21 Drawings of smaller T-plate that we will be using under QEAs and FF sextupoles Width 457.2mm Length 482.6mm If need wider movers: would make new T plates and use shafts, stepper motors, LVDTs etc from QMAG movers to finish the wider mover.

22. ATF2 Magnets ATF2 Magnets 24 October 2006Cherrill Spencer, SLAC October 2006 Annecy Mtg 22 Agreed Upon Movement of old FFTB movers Send 24 less wide movers & their electronics and cables to KEK very soon Send one wide mover and 3 less wide movers & their electronics and cables to LAPP very soon (John Seeman has to be convinced to lend us a spare “QC3” for a few months) Keep one less wide mover at SLAC On 24 th October: 4 movers crated up for LAPP and awaiting shipping documentation