● 08:00: Longitudinal blow up– 2 ramps with bunches of 2E10 and blowup in the ramp. – Quite successful.

● 14:00: Preparing new ramp & squeeze with same ref. orbit all along.– Re-activated high intensity ramp (last used and corrected 20.05).– Cloned the settings of the 2E10 squeeze and attached it to the ramp.

● 17:00: Ramp.– Excellent quality of the orbit – reference at 450 and 3.5 TeV the same (and old

corrections were still quite good).– Orbit FB worked much better (0.12 mm peak excursions).– Orbit corrected back to ~ 50 microns rms wrt injection. Transferred RT trims

into the functions for next ramp and for the squeeze.

Wednesday 9.6

1 8:30 meeting

Second rampBlow up on flat bottom to 1.5 ns. Phase noise excitation (0.4 deg rms) was applied starting after the RF voltage

increase at 300 seconds. The bunch lengths were 1.1 ns at the end of the voltage increase and decreased

smoothly to around 0.9 ns at the end of the ramp. The bunch profiles remained approximately Gaussian throughout.

8:30 meeting 2

3 weeks integrated orbit drift @ 450 GeV

8:30 meeting 3

Up to 0.6 mm rms

Ramp

8:30 meeting 4

Orbit on flat top after correction

8:30 meeting 5

Diff. wrt injection

40 to 60 micron rms

● Longitudinal blowup during the ramp. A bit manual. Some differences between B1 and B2 to be understood.

8:30 meeting 6

● 19:00 Squeeze.– Collapse separation bumps.– Decided to use the orbit FB with injection optics (optics change still has

problems), deselecting all BPMs from Q4.L to Q4.R.– Squeezed to 9m, 7m and 5m.– Orbit FB worked smoothly, peak RT kicks around 3-4 microrad.– Orbit excursions during entire squeeze less than 70 microns rms, limited to

the IR regions.– In cleaning sections the stability was < 50 microns rms.– Transferred RT trims into functions at each point, and cleaned the IR regions

for features not corrected by orbit FB.– Super-cool and super-smooth squeeze !

● 23:00 ORB fix for dispersion– OK but must watch out: if the FB strength is too large (no. eigenvalues), the

FB can become unstable and drive the correctors (H) all in one direction !

Wednesday 9.6

7 8:30 meeting

Orbit difference 10/11 m - 5 m

8:30 meeting 8

40 to 60 micron rms

● 23:00 High intensity.– Injection of nominal bunches. Longitudinual blowup in the SPS.– Strong horizontal instability. Emittances just after injection around 3 um,

growing in H to 10 um in a matter a few minutes. Coherent beam motion.– Re-injected with octupoles to -0.5. Seemed better, H emittance stabilized at 5

um. Ramp with Q and orbit FB. Octupoles removed for ramp.– Smooth ramp – orbit excursions < 0.07 mm rms.– But continuous emittance growth to

– B1 : from 4.8/2.9 to 7.4/5.5– B2: from 5.0/6.8 to 6.7/11.7

– Q’ corrected from 9 to 4-5. Incorporated into ramp.– Beam lifetimes good, > 25 h. Bunch length 0.8-0.9 ns.– Collide: lost ½ of B2 (larger beam) while ramping down separation, close to

the end of the process. Forgot to change to collision tunes !!! Arrgh !!

Wednesday 9.6

9 8:30 meeting

Unstable beam

8:30 meeting 10

Second ramp

8:30 meeting 11

Profiles..

● Tails…

8:30 meeting 12

● 06:30 Medium intensity – 8E10– Looks much better.– Emittances of 3 um at start of ramp, 5 um at end of ramp.– Testing collisions now…

Thursday 10.6

13 8:30 meeting

● Program for today:– Transverse damper studies.– Longitudinal blowup with nominal bunch.– More ramp and squeeze over-night, prepare 3.5 TeV beam for collimation on

Friday morning.