Machine setup for Phase A.2:

  1. Magnet families required:

    • Main lattice circuits (bends, quads) powered to nominal

      • Use commissioning tunes (64.28/59.38)

    • Crossing angles at zero, separation bumps at zero

    • Correction circuits required

      • Orbit correctors

      • Trim quads

      • Sextupole spool pieces ON and at nominal settings (from magnetic measurements)

      • Lattice sextupoles ON and at nominal settings (to correct for natural chromaticity)

      • Skew quads ON and at nominal settings (from magnetic measurements)

    • Correction circuits not required (ON and demagnetization cycle to zero field)

      • Inner triplet multipole compensation

      • Skew sextupoles, lattice octupoles, octupole and decapole spool pieces.

    • Circuits which have to be switched OFF (software interlocked)

      • Spectrometer magnets and compensators.

      • Experimental solenoids

       

  2. Expected machine settings with this configuration assuming "nominal cycle and wait":

    • Coupling:

      • Closest Tune Approach < 0.1

    • Chromaticity (spool pieces and lattice sextupoles), assuming about 20% error in the b3 estimate:

      • Horizontal: 0 +/- 20

      • Vertical: 0 -/+ 20

    • Chromaticity (no correction):

      • Horizontal: about -180

      • Vertical: about 0

  3. Beam type: pilot

    • Ib: 5 •109 p+

    • en: 3.5 mm.mrad; smaller en (down to 0.3 mm.mrad in case of problems).

    • eL: 0.25 - 0.8 eV.s

    • Δp/p: 0.15 - 0.6 10-3 (r.m.s.)

     

  4. LHC modes: "inject and dump" (set 10-1000 turns)

    • One ring, single injection on demand

    • One ring, repeated injection

    • Two rings, interleaved repeated injection

    • Cycle: nominal cycle and wait (>20 minutes after injection level is reached)

    • Occasional re-cycle (in particular during energy matching) (90 minutes) [13]

     

  5. Machine protection: as for phase A.1, except for the screens.

    • Magnet protection assumed to be fully commissioned

    • Single pilot bunch poses no damage risk for LHC machine at 450 GeV

    • SPS interlocking to make sure only a pilot is delivered

      • SPS HW intensity interlock (set and tested to about 4•1010 p+)

      • SPS Safe Beam Flag to allow extraction into empty LHC

      • SPS extraction master BICs with logical conditions tested

    • LHC BIS must be operational, including injection BIC

    • Injection permit only if LHC beam permit loop closed

    • Critical Settings Management MCS system to ensure that configured settings are not corrupted or changed by unauthorised persons

    • Role base Access RBAC to limit settings access to authorised persons

    • Beam dump and LHC mode “Inject and Dump” allow screens to be in beam. Here screens should be OUT and there should be an alarm or interlock when they are IN.