Chamonix 2011 LHC Performance Workshop

Session

Session 04 Beam Energy

Session04

25 Jan 2011, 17:00

Chamonix

Conveners

Session 04 Beam Energy

• Andrzej Siemko (Chair)
• Marco Zanetti (Scientific Secretary)

57. How much Physics benefits from running at higher energies?

Bill Murray (Particle Physics-Rutherford Appleton Laboratory-STFC - Science &)

25/01/2011, 17:00

In 2010 the LHC experiments accomplished stunning physics results collecting collision data at the record center of mass energy of 7 TeV. Such energy is though still a factor two below the design value of the LHC. Higher beam energy will be beneficial for the physics program of the experiments. The discovery potentials for the main physics objectives will be discussed as a function of center...

51. Update on calculations of max. excess resistance allowed as a function of energy for the case of prompt/semi-prompt/adjacent quenches

Arjan Verweij (CERN)

25/01/2011, 17:25

Operating at 3.5 TeV with defective 13 kA joints is based on twofold safety: 1) it is extremely unlikely that a magnet quench will propagate to the interconnect, and even if this occurs, 2) it is extremely unlikely that the joint will burn through, assuming the measured distribution of defective joints. Above 3.5 TeV, the currents become sufficiently large to burn a defective joint, and for...

58. Current state of copper stabilizers and methodology towards calculating risk

Mike Koratzinos (CERN)

25/01/2011, 17:50

The talk will start by reviewing the landscape: a brief mention of the results of the warm copper stabilizer measurements and the results of the splice measurements at cold will be shown. The preliminary results of the recent RRR measurements will then be presented. Then, together with the limits presented from talk no. 2, the probability of an incident will be presented for beam energies...

52. Implications of increased beam energy on QPS system, EE time constants, PC

Jens Steckert

25/01/2011, 18:15

The operational limits given by the present configuration of the LHC Quench Protection and Energy Extraction Systems will be presented and the necessary modifications to operate with beam energies of 4, 4.5 and 5 TeV will be explained. The presentation will not only focus on changes to the hardware such as the installation of snubber capacitors for the energy extraction systems but as well on...

53. What needs to be done to reach beam energy above 3.5 TeV? Commissioning of essential magnet powering and machine protection systems.

Dr Nuria Catalan Lasheras (CERN)

25/01/2011, 18:40

After the initial plans in 2007 to run the LHC at 7 TeV, a number of unexpected events, and the extended knowledge of the machine that came after them, have convinced us to gradually reduce the beam energy to the current 3.5 TeV. As a consequence of this, some circuits have been commissioned to different energy levels.  Some systems, as the quench protection system, are working at a reduced...

54. Consequences of a hypothetical incident for different sectors

Laurent Jean Tavian (CERN)

25/01/2011, 19:10

During the 2009 long shutdown, the LHC machine has been partially consolidated by adding safety relief devices in order to better protect the cryostats against large helium release and consequently to mitigate the risks of collateral damage. After recalling the present relief valve implementation and other mitigations related to the collateral damage, this paper describes the damage process of...

55. Operational consequences of running at a higher energies

Mike Lamont (CERN)

25/01/2011, 19:30

The operational overheads of moving above 3.5 TeV are examined. This examination will look at the cost of performing such a move at the start, or during, the 2011 run. The impact of operation with beams above 3.5 TeV on machine protection systems is briefly reviewed and any potential limitations are enumerated. Finally the possible benefits of increasing the beam energy on the luminosity are discussed.