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Q20 and Injection Studies MD Floating MD. ABT-BTP, OP-LHC, ABP-LIS. Q20. 1 hour delay: Previous MD was supposed to finish at 12:00 (beam dumped) while a new ramp started at 12:25  beam dumped at 13:10  pre-cycle

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Q20 and injection studies md floating md

Q20 and Injection Studies MDFloating MD

ABT-BTP, OP-LHC, ABP-LIS


Q20 and injection studies md floating md
Q20

  • 1 hour delay:

    • Previous MD was supposed to finish at 12:00 (beam dumped) while a new ramp started at 12:25  beam dumped at 13:10  pre-cycle

    • We were not allowed to start set-up in the SPS during LHC ramp because of high-rad-mat operation (High-rad-mat cannot work while LHC is injecting)

    • On top of that: communication glitch when preparing for a quick access in ATLAS  beam for Q20 only at 15:00

  • No time left for testing the tool for automatic set-up of TCDI (injection studies part)

  • Please Respect MD schedule!


Q20 and injection studies md floating md
Q20

  • Injection phase corrected by +15 units for both beams

  • Switched polarity on one MDAV.610013

  • Steering:

    • Beam 2:

      • MCIAH.87408       -8.47 MCIAV.86304       7.47

    • Beam 1:

      • MCIAH.25804       9.54 MDLH.610104       11.06 MCIAV.28504       -6.20

Beam 1


Q20 and injection studies md floating md
Q20

  • Injection phase corrected by +15 units for both beams

  • Switched polarity on one MDAV.610013

  • Steering:

    • Beam 2:

      • MCIAH.87408       -8.47 MCIAV.86304       7.47

    • Beam 1:

      • MCIAH.25804       9.54 MDLH.610104       11.06 MCIAV.28504       -6.20

Beam 2


Q20 and injection studies md floating md
Q20

  • Injection with:

    • PILOT

    • INDIV (11 in total)

      • Emittance measurements

        • BSRT: some problem with data logging (communication)  manual acquisition + data saving


Q20 and injection studies md floating md
Q20

Data analysis ongoing

  • Injection with:

    • PILOT

    • INDIV (11 in total)

      • Emittance measurements

        • BSRT: some problem with data logging (communication)  manual acquisition + data saving

        • Wirescanner: in SPS and LHC (any blowup/mis-match?). Some non clear dependence on order of measurements (first horizontal and then vertical or vice versa)

    • 3E11 protons bunch injected:

      • Losses: ~8% to dump threshold

      • Emittance measurements

LHC B2 Vert.

SPS Vert.


Q20 and injection studies md floating md
Q20

  • Dispersion measurements with pilot, 3 sets of measurements with: 0 Hz, -300 Hz, -600 Hz, + 300 Hz and 600 Hz frequency trim


Q20 and injection studies md floating md
Q20

  • Dispersion measurements with pilot, 3 sets of measurements with: 0 Hz, -300 Hz, -600 Hz, + 300 Hz and 600 Hz frequency trim

Beam 1


Q20 and injection studies md floating md
Q20

  • Dispersion measurements with pilot, 3 sets of measurements with: 0 Hz, -300 Hz, -600 Hz, + 300 Hz and 600 Hz frequency trim

Beam 2

Quite big mismatch



Supercycle dependence injection losses
Supercycle dependence – injection losses

LHC filling

supercycle

Wrong supercycle composition 11/5/2012

Supercycle composition: SFTPRO + LHC1

→ Injection losses very high: dumped at injection

  • MD: Removed CNGS before LHC1 cycle to check effect under controlled conditions

L. Drosdal

V. Kain


Md result
MD result:

Nominal cycle:Beam 2144 bunches

LHC cycle directly after SFTLONG:

Beam 2

144 bunches

L. Drosdal

V. Kain


Md result1
MD result:

Nominal cycle:Beam 2144 bunches

LHC cycle directly after SFTLONG:

Beam 2

144 bunches

  • B1: Losses are the same

  • B2: Losses only slightly increased

  • Effect smaller than scraping and shot-by-shot stability

  • Phenomenon of 11/5/2012 not reproduced

  • Position of LHC cycle in supercycle could be less important than previously thought



25 ns floating md plan
25 ns Floating MD Plan

  • Before MD:

    • SPS: 1.05e11 ppb, ~2.5-3 mm emittance, scraping (~10%)

    • Extraction of 12 bunches of 25 ns up to the downstream TED

  • During MD:

  • Steering with 6-12 bunches of 50 ns (for injection oscillations and beam losses at the TCDIs if needed)  copy settings to 25 ns.

  • 25 ns Beam setup:

    • Fast setup of ADT, RF, Chromaticity (15 units) with single bunch

    • Inject 12 bunches of 25 ns and steer if needed

  • Injection of 24 bunches of 25 ns into the LHC

  • Increase intensity:

    • When 24 bunches OK  inject 48b  72b  144b (max. for B2) 288b (only for B1)

  • In case steering is needed  go back to12 bunches injection

  • Ideally take few shots per intensity to investigate TL stability and consequent losses in the injection region

  • If possible, accumulate some batches for longitudinal losses investigation

  • Recovery

    • revert all settings to 50 ns ones

    • revert all interlock thresholds to 50 ns ones, and separate cross-check

    • test injection of 6b at 50 ns still OK.


  • Q20 optics for high pile up floating md
    Q20 Optics for High Pile-up Floating MD

    • Single bunch high intensity (3E11)

    • Parallel measurements:

      • Emittance in SPS and LHC (BSRT, Wire Scanner)

      • Dispersion (if re-matched)