Speaker
Michel Jonker
(CERN)
Description
The LHC collimation system is responsible for providing
clean beam conditions and hence to assure the
protection the equipment in the LHC. A failure of the
collimation system may trigger a beam dump to avoid magnet
quenches.
The post mortem data of the collimation system
supplies the following information
• Demanded and actual positions of all
collimator jaws (millisecond accuracy)
Note: information on the actual positions is
provided by resolver, position and gab lvdt's as well as end
switches and anti-collision switches).
• Temperatures of the jaws
• Jaw vibrations over a period of a few seconds
before and after the beam dump
• BLM transient data during a collimator
movement.
• Command history
The first analysis of the collimator post mortem
data must assure that there were no internal failures in
maintaining the actual collimator positions.
A second analysis in combination with information
from beam loss, beam position and beam profile monitors
should validate that the collimation efficiency was as
required.
