1. AGENDA: 1) SDO Procurement ACTIONS has noted at last meeting (10 June): ALEXANDER: magnetic forces during assembly to be computed. In case, we could assemble the permendur sections on no-magnetic temporary “C”-return yokes. Anyway several different assembly scenario were highlighted. EVGENY: structural analysis (ANSYS) to be computed. EVGENY: prepare a detail drawing of the PM insert geometry (with tolerance, gluing, magnetization angle) for discussion with potential Suppliers (two PM wedges of L=60-65 mm glued together before final magnetization). EVGENY: prepare a detail drawing of the permendur sectors for discussion with potential Suppliers. PIERRE/MICHELE: find potential Suppliers for Permendur billets and for Helmholtz PM measuring systems “turn key”. For PERMENDUR : we have: Vacuumschmelze Carpenter (US) (Roberto is buying there permendur laminations). For HELMHOLTZ Coils Systems: a lot of suppliers offering “turn-key” systems: Lake Shore: FH Series Coils + Model 480 Fluximeter Laboratorio Elettrofisico (Walker) Oersted Technology MI Magnetic Instrumentation (with 180 ° degree rotator) Etc.

2. CLiC SD0 Status ParameterValue Inner radius4.3 mm Nom. Sext. Gradient219403 T/m2 Magnetic LengthLm: 0.248 m SDO can be also considered a BDS critical magnet as it is requested with the stronger as possible gradient. It is the last magnet of the BDS placed on the tunnel, just at the border with the experimental Hall Being much shorter and not placed inside the Detector, the magnet has less tight geometric boundary conditions. 2

3. R out α out α in PM “Easy direction” Magnet powering curve SD0 conceptual layout PM block analysed parameters CLiC SD0 Status Optimization process provides these values : α in = 18.9° α out = 8.4 ° R out = 40 mm NdFeBSmCo R out mmS-gradient, T/m 2 20217 271200 368 40234 438220 891 70235 926222 188 90236 000222 188 3

4. b6b9b12b15b18b21 units Opt.10.0974620.039891-0.08626-15.31980.0106362.390928 Opt.20.023376-0.252720.037967-12.58420.055681.663802 Opt.30.0115640.32237-0.00902-15.6347-0.063682.075975 Opt.40.008644-0.254380.044090.0001040.0469330.037846 Opt.1 S-grad 222 020 T/m 2 Opt.3 S-grad 221 247 T/m 2 Opt.2 S-grad 220 349 T/m 2 Opt.4 S-grad 215 785 T/m 2 CLiC SD0 Status 4

5. Main requirements & boundary conditions: -Tunability of ~ -20 % -Minimized vibrations (magnet should be actively stabilized) -Integration with the Post Collision vacuum pipe needed. Compactness is less critical respect to QD0. Magnet is placed outside the Detector onthe Accelerator Tunnel border. Prototype key aspects: -The proposed design should permit us to investigate the very precise assembly of several (4 or 5) longitudinal sections, each equipped with PM. -Manufacturing (with highest precision) of each Permendur sector, PM insert, “C” shape return yokes -Measuring, Assembly and sorting of PM blocks -Assembly of the sectors (magnetic forces between blocks impact? PM blocks are very fragile!) -Magnetic measurements -Final alignment CLiC SD0 Status Ø 850 mm 5

6. 6

7. AGENDA: 2) ATF2 OCTUPOLES Design Decision is still pending, but in the mean time we advance with a a conceptual design. There will a meeting at the end of the month with Japan and US to discuss next step for ATF2, this subject will be mentioned. If project approved and design mainly confirmed, the procurement scheme is traced: Do the detail design. Procure the ½ yokes (by EDM) at CERN or outside. Design tooling (mandrel, impregnation mould, ancillaries) in house and procure at CERN or outside. Wind in house the 18-20 coils. Assembly. Test. 1 st cost evaluation on the way as well as planning (>6 months)

8. PARAMETER UNITSVALUE Gradient, T/m 3 5284 Integrated gradient T/m 2 560 Aperture radius mm50 Iron lengthm0.100 Magnetic length m0.106 Coil number of turns 61 Conductor size mm x mm5 x 5 Ampere-turns A1200 Current A19.7 Resistance (per coil) mΩ14 Conductor length (per coil) m19.9 Conductor mass (per coil) kg4.5 Yoke mass kg56 Total masskg92