Modification of the vacuum chamber in ATLAS Effect on impedance and related quantities. E. M étral, N. Mounet and B. Salvant with the help of R. Veness and M. A. Gallilee. Impedance contributions. Two different contributions are to be distinguished:
E. Métral, N. Mounet and B. Salvant
with the help ofR. Veness and M. A. Gallilee
Note: this contribution is much smaller than the one coming from the unshielded bellows (in the same area).
→ about 30% increase in the power loss (obtained with two different approaches). Becomes ~1.9 W/m.
→ Transverse effective impedances for both current and future situations are estimated to be negligible with respect to the rest of the ring.