Speaker
Description
Summary
LHCb presents some particularities compared to other LHC experiments due to its
geometry (forward cone coverage). This geometry offers the advantage that most
sub-detectors are constructed in two halves that can be opened for maintenance.
Accessibility to the on-detector electronics is therefore reasonably easy and
equipment such as power supplies can be installed relatively close to front-end
electronics. On the other hand, the fact that sub-detectors can be opened implies
specific constraints for the cabling and the grounding of the sub-detectors.
A 4 meter thick shielding wall made of concrete blocks protects DAQ interface
electronics and a large PC farm of ~2000 computing nodes against radiation. Cabling
from sub-detector specific in/on detector front-end electronics to the protected
counting house has a length of minimum 60 meters. The shielding wall acts as an
important obstacle for all power, readout and control services that have to pass
through a narrow chicane.
The following points are planed to be presented:
- Overview of LHCb electronics installation
- Main choices in electronics and electrical installation
o Choice of LVPS and their position in the pit (magnetic stray field and radiation)
o Same for HVPS (recommendations)
o Cabling recommendations (shielding wall constraints, use of patch panels,
moveable parts / use of shielded cables when possible / closed metallic cable ducts
for EMC)
o Mains power distribution and main choices (separation of farm and electronics
distribution, harmonics, remote control, …) - Grounding scheme in the experimental cavern
- Optical fiber cables
o Cable type choice (Multi-mode fibers, MPO connectors, multi-ribbon, gain of space,…)
o Testing and verification of optical fiber links. - Racks control and monitoring.
- DSS (detector safety system).
