ATF 2 Magnets Report on special ATF 2

ATF 2 Magnets Report on special ATF 2 meeting held to “kickoff” France participation in ATF 2. Held at LAPP, Annecy, France 9 -11 Oct 2006 Cherrill Spencer, SLAC Member of ATF 2 Magnet Team 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 1

ATF 2 Magnets • • Purpose and main topics of meeting The purpose of this meeting is to discuss the participation in the ATF 2 project of the three IN 2 P 3 groups at LAL-Orsay, LAPP-Annecy and LLRPolytechnique, 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, – GEANT 4 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 IN 2 P 3 effort. ALL TALKS in the 3 day meeting CAN BE FOUND HERE: http: //ilcagenda. cern. ch/conference. Display. py? conf. Id=1176 This report concentrates on the magnets for the final doublet region. 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 2

ATF 2 Magnets • • • 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) 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 3

ATF 2 Magnets 24 October 2006 Most of the visitors at the meeting (another good French dinner) Cherrill Spencer, SLAC October 2006 Annecy Mtg 4

ATF 2 Magnets 24 October 2006 A French way of cooking meat (we need chopsticks they said!) Cherrill Spencer, SLAC October 2006 Annecy Mtg 5

ATF 2 Magnets 24 October 2006 View of lake Annecy and lower Alps from LAPP conference room Cherrill Spencer, SLAC October 2006 Annecy Mtg 6

ATF 2 Magnets 24 October 2006 13 th century prison in old Annecy Cherrill Spencer, SLAC October 2006 Annecy Mtg 7

ATF 2 Magnets 24 October 2006 “CLIC” table on loan to LAPP Cherrill Spencer, SLAC October 2006 Annecy Mtg 8

ATF 2 Magnets 24 October 2006 Special foot of the stabilization table– this is the active part Cherrill Spencer, SLAC October 2006 Annecy Mtg 9

ATF 2 Magnets Suggested spacing of 2 quads & 2 sextupoles on special CLIC table 26 Sept 06 NOTE: 450 mm is QD 0 core length. Overall length = 546. 1 mm. FD quads, QD 0, QF 1 using old FFTB quad “QC 3” style. BPM fits at one end only. At other end coils, fittings & terminals stick out 72. 5 mm. Quad bore value under discussionwill be less than 60 mm Sextupoles being designed. Bore ? 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 10

ATF 2 Magnets Suggested spacing of 2 quads & 2 sextupoles on special CLIC table 26 Sept 06 NOTE: 450 mm is QD 0 core length. Overall length = 546. 1 mm. FD quads, QD 0, QF 1 using old FFTB quad “QC 3” style. BPM fits at one end only. At other end coils, fittings & terminals stick out 72. 5 mm. Quad bore value under discussionwill be less than 60 mm Sextupoles being designed. Bore ? 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 11

ATF 2 Magnets Close-up of QC 3 Mover showing LVDT parts not shown on installation drawings LVDT=Linear Variable Differential Transformer These 3 position sensors and their supports, not shown on main installation drawing. 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 12

ATF 2 Magnets New Magnets Being Made for the ATF 2 part 2/4 • Two final doublet quads: QD 0, QF 1, 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 49 mm in diameter. – Will work on disassembly, EDM’ing poletips, re-assembly and magnetic measurements between now and March 2007. 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 13

ATF 2 Magnets New Magnets Being Made for the ATF 2 part 3/4 • Five new sextupoles are needed: 3 in the FF: SD 4, SF 5 and SF 6 and 2 in the “final doublet” (interleaved with final 2 quads): SF 1 and SD 0. • Considerations of available Z space and height of ATF 2 beam lead us to make new and different designs for the FF and FD sextupoles. • SF 1 & SD 0: – – will have (large) S-band BPMs attached to their core their bore should match the QD 0/QF 1 bore (= 49 mm) Cores can be somewhat longer than 90 mm their cores may need to fit in with a wider FFTB mover than the “QMAG” style & must put bore at 1. 2 m from floor 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 14

ATF 2 Magnets New Magnets Being Made for the ATF 2 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 ~90 mm 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 295 mm – 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. 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 15

ATF 2 Magnets Two important questions about the FD magnets for ATF 2 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. 2 m beam height off ATF 2 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) 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 16

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

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

New design for wide mover support by N. Geffroy, LAPP. ATF 2 With two possibilities for height adjustment Magnets - Very accurate base plate thickness for desired magnet height. - Use of spacer to adjust magnet height / inclination 27. 05 cm 32. 64 cm (40. 64 - 8) 3. 05 cm 24 October 5. 592006 cm Cherrill Spencer, SLAC October 2006 Annecy Mtg 19 5

ATF 2 Magnets T-1 plate for QC-3, sits under FFTB mover. We have only one QC-3 T plate: for QF 1 609. 6 mm WIDE Need to make at least one more wide T plate for QD 0. If FD sextupoles width demands it will need 2 additional wide T plates for them. 482. 6 mm LONG 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 20

ATF 2 Magnets Drawings of smaller T-plate that we will be using under QEAs and FF sextupoles If need wider movers: would make new T plates and use shafts, stepper motors, LVDTs etc from QMAG movers to finish the wider mover. Width 457. 2 mm Length 482. 6 mm 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 21

ATF 2 Magnets 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 “QC 3” 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 24 October 2006 Cherrill Spencer, SLAC October 2006 Annecy Mtg 22