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Beam instrumentation MDs

Beam instrumentation MDs. T. Lefevre on the behalf of the BI group. Outline. Review of BI MD activities during Run 1 BI MD requests for Run 2 Conclusions. Beam Instrumentation MDs.

uriel-bradshaw
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Beam instrumentation MDs

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  1. Beam instrumentation MDs T. Lefevre onthe behalf of the BI group 2 September 2014

  2. Outline 2 September 2014 • Review of BI MD activities during Run 1 • BI MD requests for Run 2 • Conclusions

  3. Beam Instrumentation MDs 2 September 2014 What is done in MDs is what cannot be done parasitically during normal beam operation and initial beam commissioning • Special beam conditions • e.g. larger beam emittance using ADT blow-up or different bunch length • Local Orbit bumps or K-modulation • e.g. for cross-calibration of beam profile monitors, BPM or FBCT studies • Intensity scan (scraping) • e.g. for BPM or FBCT sensitivity ranges study • RF frequency change • e.g. for strip-line BPM directivity study in LSSs

  4. Beam Instrumentation MDs 2 September 2014 • During each MDs period – 8h BI Shift • 4-5 different activities per shift • Some in parallel whenever applicable • Usual suspects • BCT, BPM, BSRT, BGI, BWS and Schottky • Typical MDs: • First part with beam tests at injection • Ramp and beam tests at flat-top

  5. Beam Instrumentation MDs 2 September 2014 • Study the performances & limitations of operational devices • Understand / Solve issues that arises during Beam Operation • e.g. BSRT Extraction Mirror heating or FBCT beam position dependency • Study the impact of known limitation • e.g. non-linearity corrections of BPM readings, • Test and develop new or modified instruments • Develop devices not yet operational • e.g. Schottky, LDM, dI/dt, .. • Test hardware modifications • e.g. BSRT gated cameras, LDM optimisation • Test firmware modifications • e.g. Modified Interlock BPM firmware • Commission new Instruments • e.g. Matching Monitors

  6. Results from BI MD - Run1 BSRT / WS calibration Calibration BSRT - WS Emittances after calibration 2 September 2014

  7. Results from BI MD - Run1 Matching Monitor Preliminary Results I=4.48e10 I=2.23e10 I=4.5e9 2 September 2014

  8. Results from BI MD - Run1 BGI – B2 2 September 2014

  9. BI situation after LS1 2 September 2014 • Modified Instruments during LS1 • All of them .. Some more than other … • e.g. Schottky monitor or BSRT B1, .. • Including both Hardware, Firmware, Software changes • New Functionalities and New Instruments • ICT and BCTW for fast beam intensity monitoring • dI/dt (Fast Beam Current Change Monitor - FBCCM) • Diode Orbit system for Collimator BPM and more.. • Beam Transfer Function using Tune monitor • Instability Monitoring system and trigger • Beam Gas Vertex (BGV) detector • BSRT interferometer

  10. Requests for Run 2 2 September 2014 • All what will not be completed during the beam commissioning period for operational BI systems … • BLMs were not part of BI MDs – Done in MPP MDs • Already known requests: • Directional Strip-line BPMs in LSSs: comp between DOROS and WBTN • Bunch intensity study scraping nominal bunches • DOROS, Interlock BPM, dIdt, .. • Bunch length dependency of ICT & BCTW • Running the beam instable (nominal bunches) • Commissioning of Instability Monitoring triggering system • CO bumps - • BPM (non-linearity correction) • Sensitivity of beam position for ICT & BCTW, Schottky monitors • Resolution study of BSRT and WS (at injection and flat top)

  11. Requests for Run 2 2 September 2014 • Already known requests continued • dI/dt (FBCCM) commissioning plan with different beam intensities and energies done with TE-MPE-MS • EmittanceBlow-up using ADT • Cross-calibration between BSRT & WS • Test of new BSRT interferometer on B1 • Investigating the possibility to cross-calibrate WS and BSRT using BTV in dump line • Masking of BTV interlocks limited to safe beam? Can we extract and measure with BTV a nominal bunch at 6.5 TeV ? • Commissioning of BGV • Requiring gas injection • In parallel to Van der Meer scans with SMOKE detector and BWS

  12. Conclusions 2 September 2014 During Run 1, BI MDs were extremely useful, at least for us, to better understand our devices Even if we assume a smooth re-commissioning of operational devices, we would already need several 8 hours shifts to assess the performance of new instruments using non-standard beam conditions Our proposal is to keep a minimum of one BI shift per MD period

  13. Thanks for listening 2 September 2014 LSWG

  14. BSRT – Interferometry (B1) • New project in collaboration with KEK (T.Mitshuashi), SLAC (A.Fisher), CELLS-ALBA (U.Iriso) • Interferometry: non-diffraction limited method widely used in electron machines to measure very small beam sizes Fringes ‘visibility’ contains information of proton beam size 28 Aug 2014

  15. Closed Orbit Bumps • +-4mm @ WS and BSRT • Any new aperture and/or MPP constraint in 2015 to repeat bumps at injection and flat top? 28 Aug 2014

  16. WS-BSRT Commissioning Plan Overview N.B.: • BSRT Interferometry can be done in parallel to imaging • BSRT mirror deformation monitoring can NOT be done in parallel to imaging 28 Aug 2014

  17. BSRTM (mirror) deformation monitoring 28 Aug 2014 • Shack-Hartmann mask • When inserted (just after view port) excludes BSRA • Deformation to be checked with low and high intensity • Can we exclude BSRA during scrubbing and/or high intensity commissioning? • Need MD time with high intensity and no BSRA (assuming MPP ok) ?

  18. Wave front distortion measurements - Hartmann mask T. Mitsuhashi 28 Aug 2014 • Very cheap • Not sensible to floor vibrations • Need • the mask as close as possible to the mirror  normally is ‘destructive’, can’t split light to other devices before the mask • mask-screen lever arm as long as possible

  19. BSRT Interferometry commissioning 28 Aug 2014 • Slits out  test imaging • Setup polarizer • Find horizontal polarization only • Check imaging resolution dependence on rectangular iris aperture • Insert slit H • Setup operational vertical aperture of rectangular iris • Visibility vs slit separation • Determine operational slit separation • Repeat for V • Test H and V measurements

  20. Halo Monitoring via Sync light 28 Aug 2014 Studies for HighLumi Coronagraph? Flipping Micro-Mirrors ? Project just starting, nothing defined, not clear if any tests in 2015

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