Racks

Front-end electronics racks mechanical parts :

This page gives a general overview on the different mechanical parts to be installed in the electronic racks in the cavern as well as in the barracks. All the different mechanic parts concerning racks are listed here below. In LHCb some of these parts will be refurbished and reused from what was already existing during LEP.

The 56 and 59U racks in the barracks as well as the heat exchangers, deflectors will be reused. Some other elements like the turbine units and the fan trays will be newly installed. The reason for that is because the fan trays for the Wiener crates will be delivered from Wiener and already installed and tested in the crates. For the other equipments that have to be cooled by air and that have no fan trays already installed, fan trays units will be available through CERN store. The turbine units will be exchanged because a new monitoring board (part of the control and monitoring system) will be housed in it. The new LHC turbine unit will be delivered with the monitoring board already installed and tested.

Turbine units (4U / 750mm deep):

For the front-end electronics racks that will take place in the cavern and in the counting house, the new LHC 4U turbine unit will be installed. This turbine unit will house the rack monitoring board and a smoke detector connected to the rack control and monitoring system.

LHC turbine units:

The Calorimeter racks in the cavern will have special "small deep" turbine units for their on-detector racks. This is due to the use of reduced depth racks on the platform (low space available). 

Heat exchangers (2U / 800mm deep):

As mentioned above, the recuperated LEP heat exchangers will be reused in LHCb. One of these units has been cut in order to check if there is limestone or rust deposit in cooling pipes (see pictures below). New LHC 1U heat exchangers are also available through the CERN store. Number of LEP heat exchangers available: ~250 units.

                Internal water pipes of a LEP heat exchanger:

                LEP heat exchangers:

The Calorimeter racks in the cavern will have special "small deep" heat exchanger units for their on-detector racks. This is due to the use of reduced depth racks on the platform (low space available). 

LHC heat exchanger units (1U):

Deflectors (3U / 680mm deep):

The 2U LEP deflector will be reused as such. This mechanical part is also newly available through the CERN store.
Number of LEP deflectors available: ~90 units.

                LEP deflector units:

LHC deflector units (2U):

Fan trays (2U):

Normally the Wiener 6U or 9U crates are delivered equipped with a 2U fan tray already installed and tested (monitoring of the fans available via the power supply). In addition, CERN store is also proposing a 1U fan tray with 6 or 12 fans. 

Other mechanics:

Other mechanics like cable trays to be installed in front of the racks, lateral air ducts, etc are foreseen to be reused as such.

Rack components list:

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This page was last modified by VB on July 28, 2005.This page has been accessed number of times