Workshop Chamonix XV

Session

Session 02 - The minimum workable LHC - machine protection and collimation

02

23 Jan 2006, 14:00

L'Esplanade du Lac, Divonne-les-Bains

86. Commissioning and (early) operation - view from machine protection

Jan Uythoven (CERN)

23/01/2006, 14:00

Before first beam is injected into LHC, the large part of the protection systems that does not require beam for commissioning will already have been formally validated. Some systems require to be commissioned with beam at the start of beam operation. With increasing stored energy, increased performance of some protection systems is required, and also additional systems must be...

62. What Systems request a Beam Dump

Jorg Wenninger (CERN)

23/01/2006, 14:25

The protection system for LHC beam operation is composed of 'client systems' that may request beam dumps, of a beam interlock system that transmits the requests and of a beam dumping system that extracts the beams to the beam dump blocks. The various players involved in beam interlocking will be presented, and the core systems that are required before beam operation may start will be...

67. What is required to safely fill LHC

Verena Kain (CERN)

23/01/2006, 14:50

Machine protection consisting of passive and active systems will be used to prevent damage during the LHC injection process. Concerning beam 2, parts of the SPS extraction and transfer line beam interlock system has already been successfully tested during the TI 8 commissioning. Key elements of the final system for beam 2 will be validated during the LHC sector test with low intensity...

85. What is required to get the beam safely out of LHC

Brennan Goddard (CERN)

23/01/2006, 15:40

Assuming that the trigger is provided, the Beam Dumping System LBDS must safey remove the beam. The first stages of commissioning will include individual hardware tests of the associated systems, together with overall system level tests and validation of the whole LBDS in the final operational configuration, culminating in the reliability run. There will be a further series of tests,...

88. Beam Commissioning of the Collimation Systems

Ralph Assmann (CERN)

23/01/2006, 16:05

The beam commissioning of the LHC collimators is outlined for the expected evolution of beam intensity and low beta optics in the LHC. Starting from the necessary pre-requisites concerning aperture and machine reproducibility, a commissioning scenario is developed that addresses requirements from both beam cleaning and protection. An initial minimal system for lower intensities is...

87. Critical Beam Losses during Commissioning and Initial Operation

Guillaume Robert-Demolaize (Univ.Joseph Fourier Grenoble I (Grenoble 1))

23/01/2006, 16:30

Since Chamonix 2005, all collimators added into model, beam losses brought down by a factor 10 compared to results, losses have been calculated for different scenarios, the sensitivity to the orbit has been addressed. From these results it can be shown that is sufficient to use a limited number of BLM's for the setup and optimization of the LHC Collimation System.

14. Commissioning of Beam Loss Monitors

Bernd Dehning (AB/BDI)

23/01/2006, 16:55

The commissioning steps for the beam loss monitor system will be discussed. There are different types of monitors. Since the functionality of the monitors with respect to damage and quench protection is different, the thresholds for the monitor types to trigger a beam dump needs to be established for the different types. Uncertainties in the threshold are expected to be caused by the...