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Injection and Extraction

Injection and Extraction. Reporting on work of many, many people who have helped design, build and commission these systems. In particular Etienne, Jan, J ö rg , Ilya, Lars, Laurent, Malika, Mike, Thomas, Verena thanks, folks. TL and injection BI. All working well, from the very start

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Injection and Extraction

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  1. Injection and Extraction • Reporting on work of many, many people who have helped design, build and commission these systems. In particular Etienne, Jan, Jörg , Ilya, Lars, Laurent, Malika, Mike, Thomas, Verena thanks, folks

  2. TL and injection BI • All working well, from the very start • One issue: could do with more BPMs through the TLs • OK when there are no problems, but complicates TI 8 studies • Propose already (this shutdown?) cabling H&V for all BPMs • Think about adding more monitors (at least in matching section) Lars and the BI guys, plus applications

  3. TL and injection apertures • Thorough checks made during sector tests for injected beam • Found serious limit in LHC at VMANF.5L2 • 10 mm error on valve corrected by VAC • Now looks as expected in H/V in both P2 and P8 • Still checks to make with circ. beam (MSI, TDI, …) I.Agapov and madx online

  4. TL optics matching • Main focus on dispersion mismatch from TI 8 • Investigations continuing – many obvious candidates ruled out • Presently checking ‘normal’ errors + traj correction as possible cause. • New match to better initial conditions from SPS • Response data (until TED) and screen matching data also being used Malika, Volker & co

  5. Breakdown in Magnet D : beam trajectory shows ~20% over-kick at 4:42hrs, i.e. consistent with breakdown ~60% thru magnet D. Vacuum rise @ 4:42hrs Pressure in magnet D >7e-7 mbar…. MKI performance: spark on MKI.D2 (07/09/2008) • No beam loss before magnet spark. • Valve at exit of Q5 was first one to interlock, with a pressure rise of >1e-6, at 04:42hrs. • Valves upstream and downstream shut to isolate 2 sectors around the valve. Valve closure causes out-gassing….. • Conclusion: magnet D spark caused the vacuum rise: bunch spacing was 48s, and the bunch was over-kicked – therefore magnet broke-down before bunch arrived. • Shows real need for TDI system and for good injection protection! ~5-6 s kick Mike Barnes & BT

  6. Injection sequencing and procedure • Injection sequences well-sorted out • Synchronisation and timing now looks ~stable • Still a lot of conditions to get ready for OP beforehand • Injection kicker SoftStart • Beam permit loops • SPS and LHC modes • LBDS arming • Beam extraction from SPS • Kicker-beam synchronisation check • Beam to TED, TDI and into LHC • … Verena, Reyes & Delphine

  7. Steering and stability • First steering done for B2, several mm off in vertical • Nice convergence of autopilot algorithm • To revisit to include MSI and MKI, and check apertures • Short-term (1 h) stability looks OK at injection point on screens • P8 - measure RMS jitter of 0.27 / 0.13 nominal s (cf ±1.5 spec) • Still to check P2 and long-term effects Jorg, Verena

  8. Injections - present status

  9. Extraction and dump BI • No major problems seen – BLMs, BTVs working straight away • No time yet for systematic checks • BCT performance with kicker noise to be looked at Dump BTVs “Loss-free” B2 extraction Logged losses Lars and the BI guys

  10. Strengths and setttings • In sector test #3 quickly found 200 urad error in MSD strength • V. trajectory from BTVs, losses at MKB • Corrected for 10/09 and now looks good at first sight • Still to check details with beam, and update BETS tables MKB MSD +200 urad Mike & LSA

  11. Kickers • No problems seen so far • MKD strength looks OK at present • Will need to sort out orbit before final checks • MKB sweep has been seen on BTVDD already • Debunched beam extracted in a few cases • Systematic checks still to make Dump with RF off Inject inject and dump mode Etienne, Jan & BT

  12. Sequencing and synchronisation • Dump sequences well-sorted out • Arming, Inject and dump, circulate and dump • “Inject and dump” and “circulate and dump” modes work OK • Still to check “C&D” for B1 • Can try to speed up to get every injection…not yet. • Beam is kicked out OK • Detailed synchronisation between kick and bunch 1 still to do MKD kick and beam Verena, Reyes & Etienne

  13. Dumps - present Status

  14. Injection: summary • Looking pretty good at the moment • Main issue still unresolved is to find unambiguous cause for TI 8 D mismatch, and then to define and test the correction strategy • Still plenty of work to be done over the next weeks • TI8 to LHC optics matching (dispersion and betatron). • Measurements of injection mismatch and blowup • Re-visit injection steering – MSI, MKI, aperture, … • Setting-up and validation of injection protection systems • MKI kick waveform measurement • Commissioning of abort-gap keeper • Tests of injecting into different buckets • MKI flashover happens – use protection

  15. Dumps: summary • Basic functionality demonstrated for B1 and B2 • Synchronisation, kickers, septum, BI, beam on TDE • Still all systematic checks with beam to make in next weeks • Aperture with extracted and circulating beam • Detailed synchronisation • Settings and strengths • MKB sweep measurement • Beam related interlocks (BPSA, TCDQ, BLMs, …) • Full BI checks • PM and XPOC systems • Setting-up and validation of dump protection systems • Commissioning of abort-gap keeper First “Emergency Dump” on Thurs 11th at 22:45:08

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