An Hybrid QD0 for SID ? Marco Oriunno (SLAC), Nov. 14, 2013 LCWS13, TOKYO.

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Presentation transcript:

An Hybrid QD0 for SID ? Marco Oriunno (SLAC), Nov. 14, 2013 LCWS13, TOKYO

L*, 3.5 m QD0 Supported from the Door SC QD0 Gate Valves Fast Push-Pull Swap IP

ILC QD0 : Cold Mass 2K Helium (BNL) ~3.5 m Technology of the superconducting final focus magnets has been demonstrated by a series of short prototype multi-pole coils. QD0 magnet split into two coils to allow higher flexibility at lower energies. The quadrupoles closest to the IP are actually inside the detector solenoid. Actively shielded coil to control magnetic cross talk Additional large aperture anti-solenoid in the endcap region to avoid luminosity loss due to beam optics effects. Large aperture Detector Integrated Dipole (DID) used to reduce detector background at high beam energies or to minimize orbit deflections at low beam energies.

Lumical 220 kg Mask 570 kg Beamcal 136 kg BPM Bellow SID Forward Region

Space Requirements Current QD0 Prototype is designed for L* 4.5 m L* 3.5 m cross section 14 mm reduction of the QD0 cryostat gained moving the present QDO design at L*3.5 with the 14mrad crossing scheme (1 m x 14 mrad = 14 mm)

6 Vacuum Spec from Beam Gas Scattering Within the IP region there are hits/bunch (3-6 hits TPC) at an average energy of about 100 GeV/hit originating QD0–200 m from the IP. Therefore 1 nT from QD0–200 m is conservative. OD2.4 cm x 7 m long gas (H 2 /CO/CO 2 ) 250 GeV e- Scattering inside the detector is negligible up to 1’000 nT Luminosity backgrounds (pairs,  hadrons) are much higher No need of permanent Pumps Cryopumping is free benefit

7 Fringe Field for a quadrant view of SiD - Cut 200 Gauss More Iron at low radius - Better flux return – Lower fringe field

MSL - SLAC 8 20 R.L. Cu target in IP-9 m. Large pacman. 9 MW BEAM PLANEPENETRATION PLANE 9 MW µSv/event - 10 µSv/event mSv/h M.Santana, SLAC

Door Closed Door Open 2 m Door Open 3 m Door Closed, Max sag = 0.1 mm Door Open 2 m, Max sag = 2.3 mm Door Open 3 m, Max sag = 6 mm Displacements (mm) Forward region cantilevered from the QD0 cryostat can

QD0 Wedge Design Concept Total Pad Travel as is =.475in Height of pad and distance of displacement will be changed pending analysis on sagging of beam line. Conceptual design only at this point Limit Switches Potentiometer X Y   Four Degree of Freedoms

11 Forward Region Diameter – Inner Detector maintenance Door Closed Door 2 m Open Door 3 m Open The door slides on the QDO The Inner Detector slides on the QDO

12 Interface QD0-QF1: Critical for Fast&Reliable Push-Pulls 1 m QF1 QD0 Kicker Cryogenic Penetration Vacuum Instrumentation