Exit Conditions for Phase A.4:

Main goals: Establish reference "golden" orbit, linear optics and aperture for the ramp with nominal 450 GeV optics. If necessary, correct these parameters to the required levels. Measure the chromaticity, make corrections available for the ramp.
In addition, verify corrector polarities. Commission a sub-system of collimators and protection devices in preparation for higher stored intensities (only needed if we go straight to A.8; real commissioning in A.5).

Step	Objective	Priority
A.4.1	Reference closed orbit and optics for higher energies and/or higher intensities Nominal injection optics with nominal tunes     -- Orbit corrected within tolerance (peak+r.m.s.); measurement accuracy to be defined     -- Beta beat measured (and corrected) within tolerance as far as possible     -- Dispersion measured (and corrected) within tolerance as far as possible	1
A.4.2	First detailed estimates of orbit/optics stability and reproducibility	1
A.4.3	Measurement of global machine aperture at injection. If necessary, correction to a predefined value (to be defined)	1
A.4.4	Detailed local aperture measurements in critical locations; optimization of local bottlenecks that become critical at 7 TeV     Priority 2 becomes 1 if the global aperture is too small and we need corrections     Priority 2 becomes 1 if we squeeze after ramp	2
A.4.5	Measurement of the momentum aperture	1
A.4.6	Settings for a sub-set of protection and collimation systems, ready for limited higher stored energies (ramp or higher intensities at 450 GeV). Databases filled with required beam-based parameters.	1
A.4.7	More detailed local optics measurements (betas, dispersion, ...) at critical locations (collimation insertions, dump, injection, IR's, wire scanners, ...)	2
A.4.8	Measurements of global non-linear optics parameters. Correction if necessary     -- Q vs. Dp/p to get Q', Q'', ... : priority 1     -- Q vs. amplitude: priority 2	1 to 2
A.4.9	Commissioning of non-linear correctors (polarities, strengths; correction if necessary)     -- Correctors that are not needed must have a zero field - priority 1     - Lattice correctors:         1. Normal sextupoles (b3) - Priority 1         2. Skew sextupole (a3) - Priority 2         3. Landau octupoles (b4) - Priority 2     - Spool piece correctors:         1. Normal sextupole (b3) - Priority 1         2. Normal decapole (b5) - Priority 2         3. Normal octupole (b4) - Priority 2     - MQX correctors (dodecapole, b6) - Priority 2	1 to 2
A.4.10	Detailed RF measurements	2
A.4.11	Detailed matching of injection	2
A.4.12	Detailed commissioning of the IR bumps     -- Parallel separation bumps of all IP's [Priority 2 - in preparation for 2 beam operation]     -- Spectrometer compensation at IP2/IP8 [depends on spectrometer status]	2
A.4.13	Dedicated beam loss studies	2