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Updates on Preliminary Beam Loss Estimates and Layout with Tilted Plasma Cell

Updates on Preliminary Beam Loss Estimates and Layout with Tilted Plasma Cell. Beam losses. Beam loss detection: BLMs along the line (critical locations: aperture bottlenecks)

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Updates on Preliminary Beam Loss Estimates and Layout with Tilted Plasma Cell

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  1. Updates on Preliminary Beam Loss Estimates and Layout with Tilted Plasma Cell C. Bracco

  2. Beam losses Beam loss detection: • BLMs along the line (critical locations: aperture bottlenecks) • BLMs in the experimental area (up and downstream of the plasma cell + dump region)  we need a better knowledge of beam at the exit of the plasma cell  detailed FLUKA studies. • Existing BCT at the beginning of the line (TT60) + BCT at the end of the line Beam losses • Normal operation: • No losses along the line (TT61, TT4 and TT5) • Accident scenario: • 1 nominal bunch (3E11 p+), interlock on BLM + magnets current (dipole and quadrupole) C. Bracco

  3. Tilted Plasma Cell Beam divergence (A. Petrenko) Exit of plasma cell Large divergence  difficult to focus the beam  bend primary beam and tilt plasma cell (proton beam and laser still parallel to plasma cell axis) 0.45 mrad 5 m for beam diagnostic and spectrometer Muons angular distribution downstream of the dump: 87 mrad >> beam divergence  plasma cell tilted by 87 mard (~5°) C. Bracco

  4. Beam Line Towards Plasma Cell in TT4-TT5 450 GeV p+  Br = 1503 T m Normal conducting magnets: B = 1.6 T (1.8 T is close to saturation) L = (q * Br) / B  q = 5°  L = 82 m only for bends!! L ha~ 3.6 m !! q = 5° hb TT61 TT4 + TT5 dump C. Bracco

  5. Plasma Cell H= ha+hb = 5 m Impossible! 10 m long plasma cell hb~1.3 m ~5 m for Spectrometer and diagnostics 0.5 m dump C. Bracco

  6. Beam line Towards Plasma Cell in TT4-TT5 H = 2.5 m (?)  ha = 1 m  L = 23 m B = (q * Br) / L  B = 5.7 T possible only with superconducting magnets! L ha~ 1 m q = 5° TT61 TT4 + TT5 dump C. Bracco

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