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Monday . Recover after trip of RB.A81  Cause of the trip not clear. MP3? 09:00-13:00 Re-inject and Injection verification. In parallel investigations on the injection pulse inhibit occurred on Sunday

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Monday

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Monday

  • Recover after trip of RB.A81  Cause of the trip not clear. MP3?

  • 09:00-13:00 Re-inject and Injection verification. In parallel investigations on the injection pulse inhibit occurred on Sunday

  • 13:00-15:00 Pre-cycle of S12 after power cycle of nQPS crate B10L2 needs to be power cycled to re-establish local communication.

  • 15:00-17:00 Work in the injectors to adjust intensity, transverse, longitudinal parameters. RE-optimization of the scraping in the SPS to reduce losses (20% of beam lost)

  • 17:00 Beams dumped during injection of last but one 24 bunch train of B1 (losses on TCTH.4L2.B1)

  • 17:00-19:00 Reduction of the transverse blow-up in PS and SPS

  • 21:20 Stable beams #1408  Finally some physics!!

  • 07:00 End of physics #1408 (~2.4-2.5 pb-1 in 9.6 h) for vernier scans

  • 07:30 Beam dump

  • 08:30 Access


Injection

  • TI8 resteered in H and V to optimise losses and injection oscillations - corrected back to the reference and the injection looked good - IQC all green for 24b, oscillations below 0.5 mm

  • TI2 looks fine in steering - the -1.25 mm bump is left in through the MSI. Large oscillations in V as a result.

  • Checked effects of moving in some TI2 screens, on losses in MSI, with TCDIs out

  • Confirm the request to check locally the alignment of the MSI, especially in the region of transition between MSIB and MSIA.

B. Goddard, M. Meddahi


Injection kicker pulse inhibit

  • Drift of LHC timing wrt SPS timing due to GPS time reference.

  • LHC RF prepulse generation is based on SPS timing, but MKI resonant charging start is based on LHC timing.

  • Timing drift introduced a delay of roughly 200us on LHC injection forewarning (-1000ms) wrt RF injection prepulse. Problem disappeared after re-synchronization of the machines on Monday at 3 AM

Sat 09/10

Sun 10/10

Ph. Baudrenghien, E. Carlier, J. Kozsar, N. Magnin


Injection kicker pulse inhibit

  • Actions:

    • Verification by expert of the status of the synchronization before injection (done for the past fill)

    • Replacement of the GPS timing receiver  this morning

    • Other actions under study:

      • pulse (instead of the LHC timing) to start charging the PFN, making the scheme more robust  we should go for that

      • extraction inhibit when injection pulse is inhibited


Stable beams #1408

  • Initial emittances from luminosity ~2.5 um


Vacuum Stable beams #1408

  • Switched OFF/ON solenoids at ~23:00?


Quasi-UFO event

  • In 27.R7 ~10 mins after the start of physics21:33:31 - Warning on: BLMQI.27R7.B2I30_MQ, integration time: 640 us, losses = 9.250231E-02, threshold = 2.192476E-01, ratio = 42%21:33:31 - Warning on: BLMQI.27R7.B2I30_MQ, integration time: 2560 us, losses = 2.536262E-02, threshold = 5.481189E-02, ratio = 46%21:33:31 - Warning on: BLMQI.27R7.B2I20_MQ, integration time: 640 us, losses = 9.020587E-02, threshold = 2.192476E-01, ratio = 41%21:33:31 - Warning on: BLMQI.27R7.B2I20_MQ, integration time: 2560 us, losses = 2.487477E-02, threshold = 5.481189E-02, ratio = 45%21:33:31 - Warning on: BLMQI.27R7.B2I10_MQ, integration time: 320 us, losses = 3.716156E-01, threshold = 6.445071E-01, ratio = 58%21:33:31 - Warning on: BLMQI.27R7.B2I10_MQ, integration time: 640 us, losses = 2.699785E-01, threshold = 3.222535E-01, ratio = 84%21:33:31 - Warning on: BLMQI.27R7.B2I10_MQ, integration time: 2560 us, losses = 7.329793E-02, threshold = 8.056338E-02, ratio = 91%THAT WAS CLOSE!


Today

  • Access from 08:30 to 12:00-13:00:

    • Access in IP2 for Injection area investigations (radiation survey, alignment, X-ray)

    • UJ33 for the installation of a magnetic probe at 09:00

    • Cryogenics in PM85 (no RP, no MAD required)

    • UPS in UX45

    • In parallel: change of GPS repeater

  • PM:

    • Recovery and injection verification (B1)

    • Abort gap cleaning at injection (4 hours)

  • Night: Physics fill with 248 bunches

  • Wednesday AM: VdM scan


Outstanding requests for studies

  • Periodic loss maps (not really MD)

    • Betatron loss map done week 40.

  • Orbit shift versus TCT check: collide 1 bunch and check the TCT center change as compared to predicted orbit change.

  • BI

    • PLL studies during ramp

    • Commission BGI in preparation to ions – switch on at injection

    • Other BI studies – list to be updated

    • Test of 'dynamic' references for the OFB (varying Xing.separation bump): injection, then test of ramp + first part of squeeze.

  • BT

    • Abort Gap Cleaning – on at injection for physics

    • Injection Studies 32 Bunches when required (344 bunches)

  • Setting-up of the SPS with tighter batch spacing (225 ns)


Scheduled lift maintenance

  • Some preventive maintenance has been requested on the LHC lifts, and agreed according to the following planning:

    • Tuesday 5 October:             PM15 from 8h to 12h00; PM25 from 13h30 to 17h30

    • Wednesday 6 October:       PX24 from 8h to 12h00; PZ33 from 13h30 to 17h30

    • Thursday 7 October: PM85 from 8h to 12h00; PZ85 from 13h30 to 17h30

    • Tuesday 12 October :          PM56 from 8h to 12h00; PM65 from 13h30 to 17h30

    • Wednesday 13 October:     PZ65 from 8h to 12h00; PM76 from 13h30 to 17h30

    • Thursday 14 October:          PM45 from 8h to 12h00; PZ45 from 13h30 to 17h30

PM56

PZ85

La maintenance du PM56 aura lieu le jeudi 7 de 13h30 à 17h30, celle du PZ 85 le mardi 12 de 8h à 12h.


Access Requests

  • TI : demineralized water alarm UA83  Technical stop

  • COD: RCBH15.L6B1

  • RCBXH3.R1 temperature reading issue?


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