Chamonix 2011 LHC Performance Workshop

Session

Session 06 Machine Protection in 2011 and beyond

Session06

26 Jan 2011, 17:00

Chamonix

Conveners

Session 06 Machine Protection in 2011 and beyond

• Markus Zerlauth (Chair)
• Giulia Papotti (Scientific Secretary)

Description

The session will provide a synthesis of the experience with the commissioning and operation of the LHC machine protection system during the initial 2010 run. The focus will be on the stored energy target of 30MJ, but we will as well identifying possible show-stoppers , their necessary mitigations and try to identify a strategy to start increasing the intensity beyond the 2010/11 target, with a special emphasis on injection protection for very unsafe beam (ie >= 32 bunches).

Presentation materials

slides

Chamonix_2011_Summary_Session_6.docx

Chamonix_2011_Summary_Session_6.pdf

1. Experience with MPS during the 2010 run

Dr Jorg Wenninger (CERN)

26/01/2011, 17:00

In 2010 the LHC stored beam energy was pushed to 25 MJ, ten times above TEVATRON, in little over 6 months. No machine protection issues were recorded, and the reliability of the machine protection system (MPS) did not impact beam operation in a significant way. After an initial phase of low intensity beam operation that was used among other things for the commissioning of the MPS, the...

2. Can operations put the MPS into an unsafe state?

Laurette Ponce (Unknown)

26/01/2011, 17:25

During the 2010 run, the MPS have been additionally stressed by the commissioning of operational procedures and systems tests. As requested by the MPS external review committee, human factors have to be further minimized and discipline reinforced when increasing the stored beam energies towards and beyond the 2010 target of 30 MJ. This talk will present a synthesis of the Evian discussion on...

3. Preparing MPS for 2011 run

Dr Jan Uythoven (CERN)

26/01/2011, 17:50

The expected performance of the Machine Protection System for 2011 is presented. An overview of the foreseen modifications to the machine protection system components during the Christmas stop and the required time for recommissioning is given. The possible impact of the MPS on the operational parameters of the LHC, like beam intensity, beta*, emittance and maximum beam energy, are discussed.

4. Is the BLM system ready to go to higher intensities?

Dr Mariusz Sapinski (CERN/BE-BI)

26/01/2011, 18:25

The higher beam intensities will enhance the effects of the beam losses observed during 2010 run. In particular beam losses due to so called UFOs are discussed, but also other beam loss phenomena like luminosity losses, injection losses and the leakage from the collimation system are considered. The current understanding of the quench limits reflected in the BLM thresholds on the cold magnets...

5. What are the issues with injecting unsafe beam into the LHC ?

Dr Chiara Bracco (CERN)

26/01/2011, 18:50

Nominal LHC operation foresees to inject four batches of 72 bunches at the time. Injection of up to 32 bunches per batch has been tested in 2010 and possible intensity limitation and machine protection issues have been highlighted, in view of 2011 run. Beam leakage at LHCb and ALICE during injection and qualification of the provided protection are evaluated. Encountered and potential failures...

6. Is there a limitation to the stored beam energy for 2011 and beyond?

Mr Rüdiger Schmidt (CERN)

26/01/2011, 19:15

The machine protection systems have been designed to ultimately operate with beams of a stored energy of 360MJ. This presentation will address if there is an intermediate limit and what upgrades are required to permit operation with 360MJ. A failure in one of the protection systems (BLM, BIC, LBDS, …) could have catastrophic consequences for LHC. Considering the operational experience, the...