q20 and injection studies md floating md
Download
Skip this Video
Download Presentation
Q20 and Injection Studies MD Floating MD

Loading in 2 Seconds...

play fullscreen
1 / 16

Q20 and Injection Studies MD Floating MD - PowerPoint PPT Presentation


  • 136 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Q20 and Injection Studies MD Floating MD' - eugene


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide2
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!
slide3
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

slide4
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

slide5
Q20
  • Injection with:
    • PILOT
    • INDIV (11 in total)
      • Emittance measurements
        • BSRT: some problem with data logging (communication)  manual acquisition + data saving
slide6
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.

slide7
Q20
  • Dispersion measurements with pilot, 3 sets of measurements with: 0 Hz, -300 Hz, -600 Hz, + 300 Hz and 600 Hz frequency trim
slide8
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

slide9
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)
ad