Ramp

Prerequisites:

• Pilot++ (allowing some loss along the way)
• Ability to stop ramp at pre-defined energy.
• Magnets/FiDeL: Transfer functions, harmonics, decay and snapback, coupling currents.
• Settings generation: nominal ramp, design optics
• Timing system

After snapback and the first 100 GeV we expect things to quiet down considerably. The ramp dependent coupling currents are expected to be reproducible, small and thus to be taken care of in corrector functions. In the ramp some orbit corrections will be necessary; tune measurement plus some operator control will be necessary.

Collimators

The collimators can stay where they are. TCDQ also.

RF

Commission:

• RF frequency follows energy; Start with radial loop.
• 400 MHz, its voltage function through the ramp.
• Dampers, voltage and frequency driven by function generators, triggered by timing events.
• Measure: capture loss, continuous measurements of frequency response loops, bunch length - emittance growth/RF noise
• Feedforward of measured frequency offset for eventual switch to synchro-loop operation

BI

• Tune measurement and acquisition
• Orbit acquisition - on demand at pre-assigned points in the ramp, & RT acquisition, feed-forward of corrections
• Beam Loss Monitors
• On-line measurement of beam size.

Beam dump

We will have to commission beam dump at a number of intermediate energies. The pilot is fairly innocuous at low energies but we will need a fully functioning beam dump before pushing too far in energy.  Although the beam dump could be commissioned with a ramping beam, the idea would be to perform a programmed stop of ramp at intermediate energies. This would give the opportunity to perform measurement checks and to commission the beam loss monitors cleanly before dumping.
At intermediate energies the beam dump needs to check:

• Energy tracking calibration (MKD, MSD, MKB)
• Orbit/aperture
• Extraction trajectory
• Instrumentation
• Kicker timings, retriggering
• Post mortem

Thus in N steps with N ramps to 7 TeV, possibly increasing the number of bunches as we go. Naturally enough a full set of optics checks and measurements when we finally get there. The full procedure will then have to be repeated for ring 2.

Measurements at intermediate energy

• Check optics, errors, key beam parameters.