Injection tests 2009

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Tests finished 06:00 Monday morning following a night of polarity checks and aperture scans in sector 23.

Sunday

Beam successfully through LHCb to point 7 at 01:48 Sunday morning. Followed by dispersion, kick-response and higher order polairty checks in sector 78.

At around 9:30 we brough on the LHC dipole and compensators and checked the closure of the bump at various field levels. Polarity of bump switched and tests repeated.

Sunday afternoon/evening, injection protection commissioning (collimators at end of transfer lines etc) plus injection regions aperture checks continued.

Progress:

Saturday:

- Switching to TI8+LHC:

- Got much delayed (3 accesses)-

- Beam injection setting-up (TI8 to LHC) was tricky (no screen response at critical location). Fine tuning done - Looks very good.

- Trajectory optimisation done: very good results.

- Dispersion measurements: looks O.K, some beating from initial conditions

- kick response measurements starting at 3:30 (new time)

- Injection region studies (cont'd): Aperture studies in TI2+LHC injection region: done, looks good

- screens in beam in TI 2, one by one, for ALICE checks : done

Friday:

Night of Friday to Saturday: Protons down TI2+LHC:

- Trajectory checked in TI 2 (used one extra corrector at the end of the line, 10urad), traj corrections performed  in LHC: very good response.

- Dispersion measurements done in T2+LHC: good, small oscillation seems to initiate from initial conditions (see logbook)

- Kick response measurements done.

- Magnet cycling done, very encouraging results (see logbook)

23:30 Switch to protons successful - beam back to point 3. (Thanks Thomas.). 

21:30 Ion beam successfully taken into LHC. Beam traversed Alice and went straight to point 3 without correction. Following correction, beam loss studies, and fine correction of injection trajectory were performed.