RESISTIVE HEAT LOAD FOR THE TDI = LHC injection beam stopper E. Métral The TDI is a special “collimator” to be used for protecting the machine from a potential misfiring of the injection kickers  At injection only (they are opened at extraction) The Yokoya factors are and The effect of the “inductive bypass” is large due to the high surface impedance 1 per ring  2 in total Elias Métral, LCE meeting, 11/06/2004

TDI configuration for ALICE Elias Métral, LCE meeting, 11/06/2004

TDI configuration for ALICE Elias Métral, LCE meeting, 11/06/2004

3 BLOCKS LONGITUDINALLY 2.8 m 0.6 m 0.7 m Beam b = 8 σy hBN Al Cu 54 mm Ti coating (3 μm) Cu coating (10 μm) Elias Métral, LCE meeting, 11/06/2004

2 = hexagonal Boron Nitride Resistivity Skin depth Half gap TDI heat load (1/3) 2-layer formula 1 = Ti 2 = hexagonal Boron Nitride Resistivity Skin depth Half gap Elias Métral, LCE meeting, 11/06/2004

TDI heat load (2/3) Betatron functions IR2 Beam 1 Beam 2 IR8 Elias Métral, LCE meeting, 11/06/2004

What about the trapped modes ? TDI heat load (3/3)  for  for What about the trapped modes ? Elias Métral, LCE meeting, 11/06/2004