LHCb Outer Tracker Cooling
The engineering specifications of the cooling systems of the LHCb Detector
are given in detail in
An overview of the LHCb cooling system is shown below;
links to the relevant technical documentation can be found
The design of the cooling system of the Outer Tracker
has been done in collaboration with
Daniel Gasser and
Cooling and Ventilation group of the
CERN Technical Supporting Division (TS/CV).
A global description of the
OT water cooling system, as defined in the Invitation to Tender
IT-3307/TS/LHCb (EDMS 549196.v1),
can be found in the
by P. Guglielmini (NIKHEF, 19/05/2005).
Links to the relevant technical documentation can be found
The OT consists of 3
stations perpendicular to the beam axis. The
dissipating heat are arranged on the
upper and lower sides of each station. The total heat dissipated by these
modules is about 15 kW. Taking a safety factor of 1.5, the cooling system is
designed with a dimensioning figure of 22.5 kW.
The primary sources of cooling water in LHC are the
Chilled and Mixed Water,
that shall be used in the LHC surface buildings
in air handling units and in underground areas of UW and US in the heat
exchangers. Chilled Water shall be produced at the temperature of 5 degrees
and Mixed Water shall be produced at the temperature of 13 degrees.
Links to the technical documentation concerning primary water cooling
systems can be found
The OT is cooled down with demineralised water; the coolant is supplied at
19 degrees Celsius
by an independent loop connected to the mixed water through a heat
exchanger. The make-up of the coolant loop is made from the demineralised
water network. All the elements of the cooling system
(heat exchanger, pumps, three-way valves, filters, etc.)
are gathered on a common rack that will be installed on a metallic platform
in the accessible area close to the shielding wall. The demineralised water
quality is ensured via an ion-exchange cartridge
(water quality, 0.1 to 1 uS/cm).
There are two pumps in parallel, one being used for backup.
The demineralised water, supplied by the OT cooling system, is sent to the
detector through one (in+out) transfer line that splits into four manifolds
(two on either side of the beam for inlet and return flow) at the periphery
of the detector; each manifold has 6 distribution lines that feed the detector
stations (2 ``curtains'' per station). The limit of the supply is located
after each manifold. The connection between the manifolds and the OT is done
by the LHCb collaboration. Each of the two inlet manifolds will be equipped
with 6 balancing valves and 6 flow switches (on each distribution line).
The total flow rate is equally shared among the 12 distribution lines.
summarises the main parameters of the OT cooling system:
The local process (named as secondary local process) for the OT cooling
station is controlled by a single PLC. This PLC will be connected via Ethernet
to the CCC (CERN Control Centre), the DCS (Detector Control System)
and to a local SCADA in charge of UX85 cooling systems.
The primary process corresponds to the mixed water production in UW85.
The following main data and actions will be available at the DCS
and the local SCADA:
The actions will be available from the SCADA under DCS authorization only.
The cooling station status and general fault will be available at the CCC.
In case of a major failure in the secondary local process or in the primary
process, an interlock signal will be sent to the DCS. The other way around,
the DCS will send an interlock signal to the secondary local process in case
of emergency. These interlock signals shall be hardwired.
The PLC shall be based on Schneider premium TSX equipment.
Inlet and outlet coolant temperature Ti and To on the transfer line (data)
Modify set point of the coolant inlet temperature Ti (action)
Leak detection in the coolant loop (data)
Flow rate status Q in each distribution line (data)
Cooling station status (data)
General fault (data)
Remote action to switch on/off the cooling station (action)
The OT cooling system shall be available 24 hours a day during the operation period of LHC. The shutdown period will be used for maintenance.
Detailed Technical information about the OT Water Cooling System
can be found at the following links:
Information about the standard LHC Experimental Area
water cooling systems can be found at the following links:
OT Cooling Plant User Manual
OT Cooling Technical Dossier
Outer Tracker Water Cooling
- presentation by P. Guglielmini (NIKHEF, 19/05/2005)
Supply and installation of cooling equipment for LHCb detector
Best Offer from Tender
Cost projection (D. Gasser - out of date)
Cooling water for surface and underground LHC areas: