Session 2 - Injector Status and Beams for LHC, Dry Runs, Sector Tests with Beam
- Rende Steerenberg
- Reyes Alemany Fernandez
Session 2 [Chair: Rende Steerenberg; Scientific Secretary: Reyes Alemany Fernandez]
9/22/14, 4:00 PM
We will present the status of the LHC proton and ion injector chain as of September 2014. We will briefly recap the main modifications done during LS1, in particular those which influence the LHC beam quality. Then we will review the first months of beam operation of the PS complex machines and the status and plans for commissioning of the SPS. We will in particular focus on the re-start of...
Hannes Bartosik (CERN)
9/22/14, 4:45 PM
Yearly machine scrubbing has been applied in the SPS since 2002 in order to reduce the amount of electron cloud in the machine and permit smooth operation with 25 ns beams. While a quick scrubbing is usually necessary to recover performance after any extended technical stop due to in vacuum deconditioning, a longer period needs to be envisaged when the machine stop is long and a large fraction...
9/22/14, 5:15 PM
The variety of beams, needed to set-up in the injectors as requested in the LHC, are reviewed, in terms of priority but also performance expectations and reach during 2015. This includes the single bunch beams for machine commissioning and measurements (pilot, probe, Indiv) but also the standard physics beams with 50 ns and 25 ns bunch spacing and their high brightness variants using the...
9/22/14, 6:00 PM
During LS1 most of the equipment groups took the opportunity to upgrade, improve and refactor their hardware and software. A particular care is necessary for the operation team during the testing phase before beam commissioning. Some equipment and software tests from the control room have already started early in the year, including the communication with the experiments, RF frequency ramp,...
Reyes Alemany Fernandez
9/22/14, 6:30 PM
Sector tests in the past were undoubtedly invaluable and fully met their goals. They resolved a long list of problems, debugged and tested the control system, the beam instrumentation, timing and synchronization, software, etc. Measurements with beam allowed detailed optics and apertures checks to be performed, discovering aperture bottlenecks and polarity issues that could be solved. Being...