1. Thursday Fill 1364 (24 bunch) dumped at 07h
Access needed for quench heater power supply sector 45
Adjust longitudinal blow-up to better track fast bunch reaction...
Reduced time constant and increased gain
Beam injected 11.30
Trip of RSF2.A56B1
Dump test on BPMSB.B4L6.B2
PM analysis shows that in fact the dump was triggered some 1000 turns or so after the beam position stabilized. Next time (!) we will trim such the final target position is well beyond the interlock limit to be able to judge the reaction time of the interlock
13.30 Start physics fill 1365 (Scheme 150ns_56b_47_16_47_8bpi)
Tune feedback switched OFF at 800 GeV for beam 2
Beams dumped at end of ramp. TCDQ B1 interlock
ALICE dipole tripped due to electrical perturbation at point 2 (20 minutes later)
2/25/2019
LHC status

2. Injection (DC BCT looks OK)
wirescan before ramp
B2H 2.0 B2V B1H B1V 1.68
2/25/2019
LHC status

3. Injection and ramp (long blowup now OK)
2/25/2019
LHC status

4. Ramp (no B2 tune signal)
Most likely the tune spectra went flat because with the high intensity in the machine the diodes in the BBQ detectors go into Zener regime. To cure it, the parallel resistors in the "BBQ-Front-end Gain Settings" should be on. Fixed by the experts.
2/25/2019
LHC status

5. Ramp (TCDQ position monitoring)
TCDQ B1 position and limits during the ramp
We see a glitch in the position readings at the moment of the beam dump, which correspond exactly to the end of the ramp function.
2/25/2019
LHC status

6. TCDQ position monitoring
TCDQ internal protection against displacement overshoot at a start of a displacement (force positioning reading at first point of the ramp for limited duration) has been triggered at the beginning of the ramp.
Good positioning condition have been reached (damping of the overshoot oscillation) and protection stopped before the end limit of the protection duration.
Remaining part of the interlock duration has been played after the transition from MOTION_EXECUTION to IDLE at the end of the ramp (to be investigated) resulting in a dump request through the positioning and energy interlocking logics.
2/25/2019
LHC status

7. Thursday
16.00 Start physics fill 1366 (Scheme 150ns_56b_47_16_47_8bpi)
No beam from LINAC for a while
17.30 Fill for physics
Many latches of IQC
19.00 Collisions and stable beams
Initial luminosities ~ cm-2 s-1
For these intensities ε ~ 2.2 µm.rad
Congratulations .... this is wonderful !!
ALICE reports they see "parasitic collisions" which force them to stop taking data
Polarity issue ?
Integrated luminosity in ~ 13 hours ~ 650 nb-1
End of fill emittance studies
start ramp B2 H B2 V B1 H B1 V 1.86
2/25/2019
LHC status

8. Start of fill 1366
2/25/2019
LHC status

9. losses in the beta-cleaning insertion
2/25/2019
LHC status

10. Lifetimes
2/25/2019
LHC status

11. Currents and losses fill 1366 (56_47_16_47)
IPs:
2/25/2019
LHC status

12. Friday
Some time needed to tune up transfer lines (injection oscillations)
ALICE
Next steps
Scheme 150ns_56b_47_16_47_8bpi
Scheme 150ns_104b_93_8_93_8bpi
2/25/2019
LHC status

13. To fit in later
Transverse damper firmware update (to prevent glitches positions very close to 0) – W. Höfle
Test of luminosity optimization software - S. White
Gas Ionization Profile Monitor tests - M. Sapinski
Abort gap cleaning – M. Meddahi
Test of new beam presence flag system – M. Gasior
DC BCT – P. Odier
Q kicker – R. Barlow
CO security intervention to be scheduled - A.Bland
2/25/2019
LHC status