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Monday 12.4.

Monday 12.4. 09: 3 0: Physics fill for the day 17:30: Loss of cryo maintain P roblem with the temperature reading of the current lead for RQTL9.67 ( L7). A rtificial jump in temperature (immediately passing from 50 to 100 K ), which lasted for a few seconds.

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Monday 12.4.

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  1. Monday 12.4. • 09:30: Physics fill for the day • 17:30: Loss of cryo maintain • Problem with the temperature reading of the current lead for RQTL9.67 (L7). Artificial jump in temperature (immediately passing from 50 to 100 K), which lasted for a few seconds. • Reading shows similar perturbations about every 3 hours with different amplitudes. • Problem no yet understood but temporarily ‘solved’ by filtering the reading. • 19:00: Request by CMS to have access in cavern for investigating water leak • intervention lasted longer than foreseen (over one hour compared to 20min). • ALICE also had access in shadow of CMS.

  2. Monday 12.4. • 19:00: Trip of 3 RF modules for Beam 2. OK after reset. • 20:50: BIS problem related to RF for Beam2. • Latched interlock coming from a short loss of cryo OK. • 21:40: SIS problem related to QPSstate of RQX.L8 • QPS expert confirms QPS of RQX.L8 is OK. Proceed by masking signal for injection and taking shots for beam setup with low intensities. • 22:10:XPOC problem with LBDS after dumping pilot beams • Missing BCT data. • 22:45: Problem related to orbit correction. • 23:20: Again XPOCproblem with LBDS after dumping pilot beams. • 23:30: Filling in a few injections for bunch length calibration. • 00:15: Problems with loading the ramp settings. • apparently caused by adjustments during orbit corrections via trims.

  3. Monday 12.4. • Problem related to orbit correction: • MCBV.12L4.B1 = 14.54 mrad •  MCBV.16L4.B1and MCBV.8L4.B1 = -7.5 mrad

  4. Monday 12.4. • 02:00: Ramp settings OK • 02:30: CPOC problem again • 03:00: Beams circulating and ready for ramp. • 04:00: Ramp finished. • 05:00: Stable beams.

  5. 13.4. • Plan for the morning: • Squeeze in IR1 & IR5. • Squeeze in IR8. • Establishment of corrected orbit reference followed by re-adjustment of tertiary collimators. • Measurement of loss hierarchy. • Simulation of asynchronous beam dump. • Afternoon: • Damper studies at 450 GeV. • Night: • Physics fill with squeezed optics. • Wednesday: • Continuation with preparations for higher beam intensities.

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