In this talk, an attempt will be made to review the LHC experiments desiderata in the current LHC context. The impact on the physics program of the beam energy and integrated luminosity shall be reminded. In particular, the benefits and shortcomings will be presented of a 900 GeV run and of a pilot run at a yet to be defined higher energy. A few run scenari for 2009 (and 2010) will be sketched.
The choice of parameters for proton operation in the LHC in 2009 is subject to constraints from beam dynamics as well as the experiments desiderata. These constraints are reviewed and the preferred operational scenarios are presented together with possible strategies to increase the performance.
The LHC should make a “hot switch” from colliding protons to colliding lead nuclei in order to maximize the physics yield in a limited running time. I shall describe how we plan to achieve this and review the pre-conditions including the readiness of the RF system and beam instrumentation. The initial run should have the beam structure foreseen in the “Early beam” parameter list but the...
A large diversity of beams have been prepared in the LHC injectors in the past few years, such as single-bunch and multi-bunch beams, with 25 ns and 75 ns bunch spacings. In 2008 the efforts were mainly devoted to the revival of the multi-bunch beam with 50 ns bunch spacing, and the production of the different beams with intermediate intensities per bunch. The purpose of the present paper is...
In preparation for the 2008 LHC beam operation, commissioning procedures were established by the commissioning team to safely bring up the LHC performance from the initial beam tests to the first 7 TeV physics runs with reduced intensity and intermediate beta* values. The status of the procedures and their usage during the 2008 beam experience is reviewed. The improvements needed for the 2009...
The organization and the structure put in place for the machine check-out and for the beam commissioning have been instrumental for the rapid progress of the commissioning of the LHC Machine before the Sector 34 incident. After a review of the 2008 experience, the organization for the 2009 will be sketched with the expected commissioning steps and the roles of the different actors. The issue...