1 / 11

Injection System Commissioning: Tests and Beam- (Time) Requirements

Injection System Commissioning: Tests and Beam- (Time) Requirements. W. Bartmann, M.J. Barnes, C. Bracco for ABT LBOC, 15 th July 2014. Test sequence. Tests without beam with beam until upstream TED with BIS loop closed Beam measurements Pilot INDIV/Intermediate Bunch trains.

griffith-bruce
Download Presentation

Injection System Commissioning: Tests and Beam- (Time) Requirements

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Injection System Commissioning: Tests and Beam- (Time) Requirements W. Bartmann, M.J. Barnes, C. Bracco for ABT LBOC, 15th July 2014

  2. Test sequence • Tests without beam • with beam until upstream TED • with BIS loop closed • Beam measurements • Pilot • INDIV/Intermediate • Bunch trains Sector test Beam commissioning Injection commissioning requirements

  3. Not to forget …to add these tests to the list without beam • TCDI gap interlock (virtual β*) • BETS MSI current interlock • BETS TDI gap interlock Injection commissioning requirements

  4. SPS extraction • Measurements: • Setup extraction bumps and scan extraction/circulating apertures • Steer through extraction channels • Check beam positions on screens • Kicker (MKE) timings on OASIS  need BCT+MKE • Scan MKE waveforms (3 out of 5 PFNs retuned) • Beam requirements • Pilot + INDIV • Beam until downstream TED or further • Beam time • 1 shift per extraction LSS (of which 0.5 shifts already in sector test) MKE4 waveform Injection commissioning requirements

  5. TI 2/TI 8 • Measurements • Golden trajectory • Check BPM/corrector polarities with kick response • Measure TL dispersion and matching into ring • Screens matching • Setup and validate TCDI • Trajectory stability • Beam requirements • Pilot + INDIV, intermediate intensity • LHC ready for injection • Beam time • 4 shifts per line (of which 1.5 already in sector test) Injection commissioning requirements

  6. Injection • Measurements • Threading through injection region onto closed TDI • Orthogonal steering • Aperture in injection region • Setup and validation of TDI, TCLI • MKI waveform scan (change of screen conductors,TMR readjusted to compensate for aging) • MKI synchronisation • AGK synchronisation • IQC injection oscillation interlock • Blindable BLMs MP tests • Beam requirements • Pilot, INDIV, intermediate intensity • Beam time • 4 shifts per injection point (of which 1 shift already in sector test) Injection commissioning requirements

  7. Injection – bunch trains • Beam requirements: • SPS scraping • Transverse damper • Measured LHC aperture • Beam time • 1.5 shifts to go up to 288 b 288 b B2 injection Injection commissioning requirements

  8. Injection – intensity ramp up • Injection check-list for intensity ramp up • Injection protection devices at agreed positions during cycle. • Correct LSA positions, thresholds, limits, warning levels. • Injection oscillations within tolerance for all injections. • No unexplained large beam loss on TCDIs. • Expected losses for the beam to be injected at least 30 % below threshold level. • Line has been re-steered successfully if losses have been to high. • No issues in injection procedure, settings or tolerances. • Orbit in injection region in tolerance wrt reference (tolerance <0.5 mm). • Resetting of TL trajectories and TCDIs done when needed. • No increased rate of MKI flashovers. • No increased rate of MKI switch erratics or missing. • No unexplained MKI vacuum or temperature activity. • No machine-protection related injection system hardware failures Injection commissioning requirements

  9. Injection - scrubbing • In case of doublet beams check: • Injection losses, trajectories, oscillations • TDI • Retract for 15’ after being in nominal position for 15’ • MKI vacuum levels: • Flashover risk increases with instantaneous and integrated pressure • 2e-9 mbar in the tank • 5e-9 mbar in the interconnects and on the Q5 side of MKI • Beam time • 0.5 shifts for doublet beam check • Consider 250 hours of new MKI ceramic chamber conditioning before acceptable normalised pressure can be reached Injection commissioning requirements

  10. Multipacting in Ceramic Tube Pressure after TS3 (2012), measured both in and nearby the NEW MKI8D, normalized to the number of protons M.J. Barnes, LBOC 21-Jan-14 The ceramic tube required ~250 hours, with beam, to achieve a normalized pressure similar to the pre-replacement (~4E-24 mbar/p) level. Discussions with Giovanni Rumolo: an SEY of <1.4 is required to avoid multipacting. The NiCr screen conductors have a measured SEY of ~2.3, but are expected to condition relatively quickly. Injection commissioning requirements

  11. Summary • SPS extraction • 1 shift (0.5 in ST) per LSS; downstream TED; INDIV • TI 2/TI 8 • 4 shifts per line (1.5 in ST); into LHC; 12 b • Injection • 4 shifts per IP (1 in ST); into LHC; 12 b • Bunch train injection • 1.5 shifts for 288b • Scrubbing beams • 0.5 shifts for doublet beam check • 250 hours MKI ceramic tube conditioning Injection commissioning requirements

More Related