Entry Conditions for Phase A.8:

 

Entry condition
E.A.8.1
First optimization of the machine at 450 GeV done
.01
Tune, Chromaticity, orbit, coupling and perhaps beta beating under control. Aperture reasonably well established.
.02
All circuits up to b3 commissioned – polarities check with beam, etc.
.03
Collimators providing basic protection.
.04
Power Converters OFF: Skew sextupoles; octupoles spool pieces; decapoles spool pieces; crossing angle; LHCb and ALICE dipoles and compensators OFF. Separation bumps OFF.
E.A.8.2
Settings generation
.01
LSA parameter space fully defined. Settings generation available and debugged. Ramps to predefined intermediate energies.
.02
 Decay and snap-back effects will be handled by LSA’s implementation of FiDEL[1,2]. Pre-cycles settings defined beforehand.
.03
RF functions (frequency, voltage, etc) available.
.04
Collimator ramp settings (not used initially but should be there with all functionality tested).
E.A.8.3
Power Converters [Note 1]
.01
All operational functionality tested.
E.A.8.4
 Magnets

.01
Transfer functions; DC components (geometric, DC magnetization, saturation, residual, deformation); MB and MQ with decay and snap-back predictions; corrector hysteresis and cycling prescriptions for all magnets involved, handled on-line by the LSA implementation of FiDEL.
E.A.8.4
BI
.01
BCT commissioned.
.02
Closed orbit acquisition.

.03

 PLL commissioned.
.04
BCT & lifetime commissioned.
.05
Synchrotron light monitors commissioned (not critical).
E.A.8.5
Feedbacks
.01
Orbit and tune feedbacks are the priority.
E.A.8.6
Machine protection
.01
Critical BLMs commissioned and connected to the BIS.
.02
Collimators interlocked in place.
.03
Local orbit stabilization around beam cleaning insertions and dump region.
.04
Further commissioning of beam dump and BLMs.

.05

 Intensity vs. energy logic in the Safe Beam Flag (SBF) tested.
E.A.8.7
Controls
.01
Timing system fully commissioned/input to the equipment.
.02
Ramp timing table populated.
.03
Logging and data acquisition criteria established.

 

 

 

 

Notes on entry conditions

 

Note 1:

  • Load I(t) tables to all the PC involved in the ramp (ramp won't load if I(0) not within 0.01 of actual reference value. Tables have the following properties:

    • 100 μs granularity.

    • Tables can have up to 5000 points, which corresponds to a maximum duration of 400000 s.

    • Linear interpolation of supplied points.

  • FGC runs full table - no stop/re-start.

  • Abort ramp is possible, however not guaranteed to keep the beam.

  • There can be no TRIMs after loading the ramp.

  • Changes can still be put through the real time channel, however the real time TRIMs are not ramped.

  • Ramp start on receipt of timing event.