Step A.1.1 Commissioning Injection Region

• Injection Preparation (link to reference)
  
  1. check pre-injector intensity limit (should be < 1e10 ppb)
  2. check short- and long-term archiving databases are running (event & periodic triggered data available)
  3. check injection kicker/bumper settings (HV) and waveform
     • inhibit extraction of pre-injector
     • pulse injection kicker/bumper without beam (may need to temporarily override rule in timing master → check MP issue)
     • verify synchronisation (digitised waveform traces(
     • verify injection kicker/bumper waveform (amplitude and synch)
  4. Move all wire-grids into beam
  5. Set wire-grid application into subscription mode
  6. Set inject-and-dump counter to 1000 turns (automated extraction timing, tbc.)
  7. Move last collimator/beam absorber before injection OUT
  8. Set ring BeamMode from 'No Beam' to 'Pilot'
• Commission final meters in TL
  1. Close in-ring injection protection (if available)
  2. Power injection kicker/bumper ON, but kick disabled
  3. disable extraction kick in pre-injector
  4. Move last collimator/beam absorber before injection OUT
  5. Check all elements are pulsing/powered
  6. Enable injection kicker/bumper and extracts towards ring
  7. Check BPMs, BLM, wire-grids and screens
  8. Thread beam through the last part of the last part of the TL and injection septa
• Beam injected into ring
  1. Final checks that all injection and BI systems are operational
  2. Thread beam through injection septa into ring – image beam on wire-grids/screen (if available/applicable)
  3. steer roughly through injection septa -- detailed setup later
  4. Thread through the first quads onto the first wire-grid monitor
• Optional: Check stability of transfer lines and injected trajectory without injection kicker/bumper (should be done latest in A.x1)
  1. Check shot-by-shot archiving is working and all signals are correctly time stamped and correlated
  2. Run for ~1000 pilot injections without injection kicker/bumper, recording trajectory and screen shots
• Optional: Check stability of injected trajectory with injection kicker/bumper on, and measure injection kicker/bumper waveform (should be done latest in A.x2)
  1. Check shot-by-shot logging is working and all signals are correctly time stamped and correlated
  2. Run for ~1000 pilot injections with injection kicker/bumper, recording trajectory and screen shots to check stability of injection kicker/bumper (pilot at same location at waveform)
  3. Check flatness/shape of injection kicker/bumper waveform (move pilot beam timing w.r.t. waveform)
• Optional: Commission Software Interlock System (parasitic) (should be done latest in A.x3)
  1. Checks of beam-related acquisitions
  2. Test injection process with SIS active
• Optional: Perform aperture scan at injection septa for injected beam
  1. Sliding bumps at septa in both planes, measure transmission (DCCTs) and/or losses (BLMs)
  2. Correct trajectory if not centred and re-measure
  3. Target: to-be-defined

Step A.1.2 Threading Beam around the Ring

• First injections into ring with ring collimators out
  1. Beam off, move out collimators
  2. Beam on, first injection into ring past septa
• Coarse beam commissioning of BPMs (asynch. acquisition/narrow band) and BLMs
  1. Check asynchronous/narrow-band acquisition working for first BPMs
  2. Check readback of BLMs, hopefully signals where beam is lost
• Commission trajectory acquisition and correction
  1. Read-out of operational BPMs via threading application
  2. First steering in injection region
  3. Rough response checks for first correctors
  4. Test acquisition chain to shot-by-shot archiving
• Threading around ring
  1. Use LEP/LHC strategy: correct over small range (manual BPM rejection) using few correctors
  2. Observe beam on wire-grid/screen (if/where available)
  3. Throughout:
     • Repair faulty BPMs only when into trouble – as long as beam keeps going round, continue
     • Kicks & polarity - first checks as needed
     • Systematic measurement program if we get stuck anywhere
     • Detection of poor BPMs:
       • look at orbit in normalised coordinates
       • compare predicted and achieved correction
       • use experience and/or use your brain
     • Detection of COD errors:
       • Compare predicted and achieved correction
       • Use few CODs per step
       • use experience and/or use your brain
• First measurement of energy mismatch (correction if needed)
  1. Inject & measure using threading application
     • Accuracy of ~0.1% level should come for “free” from the dispersion trajectory
  2. What is correction threshold? 0.2-0.3%?
     • Probably most efficient to leave to later if possible and beam continues to go round
  3. Correct only if necessary
     • need to agree if to correct the integrated ring (Brho) or extraction/linac energy
• First BPM and corrector polarity checks and repairs
  1. Some faulty elements will be found during threading
     • Results introduced in configuration file ‘online’ either in the threading/orbit steering application or in LSA
     • Eventually have to fix polarity errors – delay until opportune (first technical stop)
     • Disable faulty/bad BPMs if not needed
     • Repair only where essential (e.g. if crate down)
  2. Systematic checks can be made as needed during threading with kick-response and Loco analysis (lengthy as ~60 seconds per scan point)
     • Perform systematic scans using two correctors
     • get BPM polarity response, corrector polarity response, rough BPM calibration factor, rough corrector calibration factor
     • In general, for this analysis the iterative fitting needs experience…
• Beam commissioning of DCCTs & ICTs
  1. Check acquisition and read-out
  2. Compare to pre-injector/last BCT readings, recalibration?
• Commission BPM intensity measurement mode (parasitic)
  • BPMs are used as BCTs in this phase
  • Detailed commissioning will be done in Phase A.3
• Optional: Systematic BPM and corrector polarity checks and repairs
  • see procedure in A.y1
• Optional: Systematic physical aperture scans, free oscillations and sliding π bumps
  
  • checks transmission monitoring, loss sensitivity of BLMs (losses on injection septa …)
  • see procedure in A.y2
• Optional: Systematic linear optics checks with kick/response
  • Higher-order multipole polarity checks
  • see procedure in A.y3
• Optional: Momentum aperture measurement
  • see procedure in A.y4