1. 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

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

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

4. 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

5. 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

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

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