Mechanical aperture (n1) values with present LHC V6.500, and

after rematching of IR7 and retuning of the phase advances in IR4,

for regions with betx>bety (F columns) and bety>betx (D columns).

present optics IR 7 + 4 rematched

Beam 1 D F D F

IR1 6.51 6.85

IR2 6.61 6.43

IR3 6.59 5.69

IR4 6.69 7.07 6.65 6.87

IR5 6.57 6.82

IR6 6.72 6.93

IR7 6.54 6.34 6.68 6.95

IR8 6.67 6.66

Beam 2 D F D F

IR1 6.59 6.68

IR2 6.71 6.50

IR3 6.16 5.52

IR4 6.57 7.08 6.59 7.09

IR5 6.58 6.78

IR6 6.78 6.94

IR7 6.45 6.96 6.59 7.10

IR8 6.61 6.71

Arcs D F

6.69 7.00

Required phase advance adjustments in IR4:

d_muxip4b1 = -0.073049; d_muyip4b1 = +0.04438;

d_muxip4b2 = -0.006784; d_muyip4b2 = +0.047419;