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Switch in PS2-SPS TL

Switch in PS2-SPS TL. Aperture defined by 20 GeV beam Starting assumptions (generous): e x / e x = 15 / 8 pi.mm.mrad b max / b min = 50 / 20 m D x = 1.5 m, d p/p = 0.15 % trajectory + mech + survey error = ±6 mm beam size ±5 s

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Switch in PS2-SPS TL

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  1. Switch in PS2-SPS TL • Aperture defined by 20 GeV beam • Starting assumptions (generous): • ex / ex = 15 / 8 pi.mm.mrad • bmax / bmin = 50 / 20 m • Dx = 1.5 m, dp/p = 0.15 % • trajectory + mech + survey error = ±6 mm • beam size ±5 s • Gives about 30 – 40 mm half-apertures depending on QD/QF • Bending angles defined by 50 GeV beam • Assume 1.8 T for normal dipole, 1.5 T for ‘specials’ • Get about 30 mrad for a 3 m long magnet • Try to accommodate in 21 m cells • About 9 m drift between TL quads • Transverse dimensions of TL quads a big issue

  2. Splitter magnets – some interesting challenges • - PS East Hall splitter – beams to 24 GeV/c • - 1.4 T in gap • 30 mm septum width • 20 x 1.35 kA turns • 500 kW power disspiation ! • Very special design

  3. - 2.79 m dipoles (standard length) • Septum width – assume 50 mm… • No clearance for switched beam • only 190 mm for TL quad half-size

  4. 3.5 m switch dipole (longer) • 2.0 m splitter (shorter) • 130 mm H good field region • Enough clearance for switched beam • 209 mm for TL quad half-size • Could fit into present TL (free drift) • But….need 1.8 T in large aperture switch magnet – tough!

  5. 2.79 m dipoles (standard length) • Bipolar switch dipole with 140 mm H good field region • Enough clearance for switched beam • 330 mm for TL quad half-size • But….does not fit into present ‘compact’ TL achromat

  6. Bipolar switch dipole + septum looks most promising • Need to fit this into the TL lattice – presently does not work • Check on feasibility of magnet parameters • Some ideas of magnet parameters (physical sizes) needed for TLs – especially quads • Might need some special slim types in these places • First idea of parameter space could be used now

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