● 08:30 Loaded by mistake squeeze function to 2 m Dumped beams ● 10:30-13:00 Test of new algorithm for long. Emittance blow-up to

minimize oscillations in bunch length observed in the past

● Could only be tested with bunch population of 2 x 1010 p and no ramp was possible due to lack of time and no beam from SPS

● For the time being reverted to previous algorithm for the night● 13:00-13:30 Rotated Ring2 by 200 ps w.r.t. Ring 1 based on the

observations done by the experiments (displacement of the interaction point by ~3 cm) .

Thursday 24.6

1 8:30 meeting

● 13:30 Started LBDS verifications at 450 GeV slowed-down by problems with SPS (frequent compensator trips) & TI8 problems (Beam2 not available from 6pm to 8pm):– TCSG/TCDQ settings cross-checked with TCP sigma scan.– Measured gap at TCSG in P6 for different TCP settings.– Check of TCDQ offset.– Moved TCDQ to different positions and cross-checked with an orbit bump the

polarity and setting. --> OK.– Check of P6 orbit interlock BPM response.– Moved parallel vertical bump in P6 until BIS state toggles.– Dump with maximum energy offset AND max orbit excursion.

Thursday 24.6

2 8:30 meeting

● Still outstanding LBDS tests at 450 GeV: - dump with max energy offset and max orbit excursion with 2e10, taking into

account all permutations of energy off-sets and bumps: 8 dumps to be performed. - asynch dumps from extreme orbit positions have to be checked with 1e11: 4 dumps to be performed.But OK to declare stable physics over the night - missing dumps tomorrow!

● 20:30 Problems rearming the LBDS dump both beams BLM crate is not sending data.– Trying to reboot the crate cfv-sr5-bpmb1la which was unreachable– The optical link in SR5.L card 5 shows errors with a result of beam dump

requests. The redundancy was not able to provide valid data.– The card in question has been exchanged.

Thursday 24.6

3 8:30 meeting

● In light of the SPS compensator and TI8 problems we decided at 7pm to change the initial schedule for the day:– Continue with LBDS studies until team has to take off.– Start preparation of physics fill as soon as the SPS is ready again– Postpone the TOTEM setup until Friday when the SPS is again running reliably.

● 22:30: Both beams are again available for the LHC– Start preparations of the the physics fill with 3 bunches a 1011 per beam– Inject high intensity beams with:

– B1 H = 2.3 V= 2.35; B2 H = 3.8 V = 3.8 at 450 GeV– B1 H = 4.6 V = 5.6; B2 H = 7.4 V = 7.5 at 3.50 TeV

● 00:30: Preparing for squeeze after flat top adjustments– 00:50: Starting to squeeze.– 01:30: Collapsing the separation bumps no apparent losses but Beam 2

lifetime worse than Beam 1 (t > 100 hours t ≈ 50 hours)

Thursday 24.6

4 8:30 meeting

● LHCf can not display the ARM 2 status (undefined on their page1) but is OK in reality

● Lumi scans:– 02:00: LHCb requests a lumi scan Sudden beam loss and lifetime degradation

observed during scan.– 02:40: Scan for ATLAS.– 03:30: Scan for CMS adjustments in vertical plane result in 30% increase.

● 04:00: Both beams dumped (2.5 hours of physics):– Fast horizontal drift seen at the BPM in 4L6. Nothing seen in the adjacent

monitors.

● 05:20: Lost RB.A78 after ramp down at 450 GeV:– need access.

Thursday 24.6

5 8:30 meeting

● Bunch length during ramp:

Thursday 24.6

6 8:30 meeting

● Feedback trims during the squeeze:

Friday 24.6

7 8:30 meeting

● Separation bumps before collisions:

Friday 24.6

8 8:30 meeting

● Orbit @ IPs after collapsing the separation bumps:

Friday 24.6

9 8:30 meeting

● Stable Beams @ 3.5 TeV with 2.5 1011 per beam in 3 bunches:

Friday 24.6

10 8:30 meeting

● Intensity and lifetimes during LHCb Lumi scan:

Friday 24.6

11 8:30 meeting

● Plan for the day:– Finish off outstanding LBDS validations.– Test sequence for squeeze and collapsing separation bumps via sequencer with

low intensity beams.– TOTEM setup @ 450 GeV in the after noon.– Hump measurements at 450 GeV (if time premits).– Physics fill.

Friday 24.6

12 8:30 meeting