IR design status IR Design Status and Update

IR design status IR Design Status and Update M. Sullivan For M. Boscolo, K. Bertsche, E. Paoloni, S. Bettoni, F. Bosi, P. Fabbricatore, P. Raimondi, M. Biagini, P. Vobly, I. Okunev, A. Novokhatski, S. Weathersby, et al. Super. B Meeting XVII La Biodola, Isola d’Elba, Italy May 28 - June 2, 2011 1 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Outline • Review of present IR design • Engineering input • Next Steps • Summary and Conclusions 2 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Present Parameters? (V 12 lattice) 3 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Parameters used in the IR designs 4 Parameter HER LER Energy (Ge. V) Current (A) Beta X* (mm Beta Y* (mm Emittance X (nm-rad) Emittance Y (pm-rad) Sigma X ( m) Sigma Y (nm) Crossing angle (mrad) 6. 70 1. 89 26 0. 253 2. 00 5. 0 7. 21 36 4. 18 2. 45 32 0. 205 2. 46 6. 15 8. 87 36 +/- 30 Super. B Meeting XVII May 28 – June 2, 2011

IR design status General IR Design Features • Crossing angle is +/- 30 mrads • Cryostat has a complete warm bore – Both QD 0 and QF 1 are super-conducting • PM in front of QD 0 • Soft upstream bend magnets – Further reduces SR power in IP area • BSC to 30 in X and 100 in Y (7 fully coupled) • SR scanned to 20 in X and 45 in Y 5 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Details of the permanent magnet slices – – – – – – 6 Name QDPA QDPB QDPC QDPD QDPE QDPF QDPG QPDH QDPI QDPJ QDPK QDPL QDPM QDPN QDPO QDPP QDPQ QPDR QDPS Beam LER LER drift HER HER HER Z from IP m 0. 30 0. 31 0. 32 0. 33 0. 34 0. 35 0. 36 0. 37 0. 38 0. 39 0. 40 0. 41 0. 42 0. 43 0. 44 0. 45 0. 46 0. 47 0. 48 Len. cm 1 1 1 1 1 R 1 mm 7. 5 7. 5 R 2 mm 12. 5 13. 0 13. 5 14. 0 14. 5 15. 0 15. 5 G T/cm 1. 392 1. 473 1. 547 1. 616 1. 680 1. 740 1. 796 7. 5 7. 5 16. 5 17. 0 17. 5 18. 0 18. 5 19. 0 19. 5 20. 0 20. 5 21. 0 21. 5 1. 899 1. 945 1. 989 2. 030 2. 070 2. 107 2. 142 2. 175 2. 207 2. 238 2. 266 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Vanadium Permendur Design • We allow for 3 mm of space for the coils (new information from Ivan – actually 2. 6 mm) • The central steel section can be very thin because the magnetic field in the steel is nearly cancelled from the twin windings • The QD 0 magnet is aligned as much as possible to the beam axis, however we must slant it with respect to the beam axis in order to accommodate the increasing horizontal size of the beam-stay-clear 7 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Vanadium Permendur “Russian” Design 8 Super. B Meeting XVII May 28 – June 2, 2011

IR design status VP design details • PM as described earlier • Magnet QD 0 H QF 1 H • IP face (m) 0. 55 0. 90 1. 25 1. 70 • Length (m) 0. 30 0. 15 0. 40 0. 25 0 2 1 0. 408 0. 381 78 • Angle wrt beam (mrad) 13. 33 • G (T/cm) 9 0. 956 0. 706 • Steel aperture (mm) 40 50 74 • Max. Field (T) 1. 49 1. 91 1. 77 1. 51 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Air-Core “Italian” Design • We replace the shared QD 0 and QF 1 parts of the VP design with the air-core design • Also place QD 0 and QF 1 parallel to the detector axis • Then we have the same field strengths and the LER and HER pieces are the same strength as the VP design 10 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Air core “Italian” QD 0, QF 1 11 P Ou ictu t o re f. D ate Super. B Meeting XVII May 28 – June 2, 2011

IR design status AC design details • PM as described above • Magnet QD 0 H QF 1 H • IP face (m) 0. 55 0. 90 1. 25 1. 70 • Length (m) 0. 30 0. 15 0. 40 0. 25 • Axis offsets (mm) 0. 5 --- 4 --- • Angle wrt beam (mrad) 30 0 27 1 0. 956 0. 706 0. 408 0. 381 • Aperture (mm) 35 50 73 78 • Max. Field (T) 1. 67 1. 77 1. 49 • G (T/cm) 12 Super. B Meeting XVII May 28 – June 2, 2011

IR design status SR power (VP design) 56 13 115 295 390 205 32 52 42 17 8 Super. B Meeting XVII May 28 – June 2, 2011

IR design status SR power (AC design) 57 14 115 311 402 215 35 57 43 17 8 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Current IR Analysis Status • SR backgrounds are under control • SR power inside the cryostats looks managable • Beam-gas, Touschek and Coulomb backgrounds are under control (see Manuela’s talk) • Beta functions are reasonable • Preliminary designs for solenoid compensation – Magnetic fields (Bertsche) – Lattice corrections (Nosochkov) 15 Super. B Meeting XVII May 28 – June 2, 2011

IR design status SVT and MDI • Good progress – Filippo Bosi has developed an initial layout of SVT hardware and has an initial design of the Be beam pipe with vacuum connecting flanges – Cable layout and how the SVT signals and power lines get in and out needs to be developed – The W shield (with/without) noses also needs to be incorporated 16 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Next Steps in the IR Design • Permanent Magnet Study – Model the PM slices and make sure that the design parameters can be achieved • Computer model used for the PEP-II magnets can tell us dimensional, positional and strength tolerances • Mechanical engineer to design fixturing for magnet slice assembly and installation 17 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Cryostat Design • Pasquale Fabbricatore has taken a first look at the cryostat and magnet designs (presentation follows) – We may need to give him more space – Probably more z space – this will alter the magnet designs – Need to generate a new IR design with these engineering constraints – Need to get an initial estimate because this impacts the inner diameter of the DCH 18 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Cryostat supports • Need an engineer to start looking at how the cryostats are supported – Involves the detector steel and how we get rapid access to the SVT and central Be chamber – Vibration control – Also involves how the cryogenic plant hooks up to the cryostats – can we keep the cryostats cold when performing a rapid access 19 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Summary • We have a good IR design that meets our requirements • Now we welcome the engineers that can come in and tell us what is impossible • Then we need to decide how to change the design with the guidance of the engineers so we can still build what we want • We may have to compromise some of the IR parameters… 20 Super. B Meeting XVII May 28 – June 2, 2011

IR design status Conclusion • We are at a good starting point • The parameter space of the IR has been studied fairly thoroughly giving us some sense of possible change directions • The next round is to now work with the engineers and together figure out how we can actually build what we want and need • This also involves the detector so stick around for the next session! 21 Super. B Meeting XVII May 28 – June 2, 2011