文档介绍：Available on CMS information server CMS NOTE 2001/XYZ
CMS Internal Note
The content of this note is intended for CMS internal use and distribution only
February 20, 2001
Engineering Layouts for the CMS Gas System Modules
A. d’Auria, G. Cerutti, F. Hahn, S. Haider, Ch. Schaefer
Abstract
The three CMS gas systems for DT, CSC and RPC are built according to uniform and modular designs. The engineering layouts of the gas system modules like mixers, purifiers or gas distribution units are described in this document. The TOTEM experiment installed at point 5, will need two smaller, vented gas systems that are partly taken into account.
Introduction
The detector gas systems for the four experiments at the LHC were designed according to uniform and standard layouts. The future gas systems will break up in functional, scalable modules like mixers purifiers, distribution units, etc. simplifying the layouts and the long-term maintainability.
This note gives precise details of how to built the functional modules and what are their individual configurations for all CMS gas systems.
Primary Gas Supplies
The primary gas supplies are located in the SGX building. The gases are supplied from Dewars, batteries, or individual gas cylinders using CERN standard supply panels A. Castel et al. Layout supply panels. EST prototype panel.
. They allow to switch automatically from the service batch to a reserve batch when the supply unit in service is empty. To monitor effectively the status of the supplies, all primary gas flows are measured using mass-flow-meters. The expected gas consumption and operating autonomy is listed in Table 1. A standard gas analysis can be carried out on each new batch installed.
Table 1 Expected consumption and autonomy of the primary gas units.
Gas
Expected Run Flow
[Nm3/h]
Expected
max. Flow
[Nm3/h]
Containment
Estimated operating time
at Run conditions
Main Supply
Reserve
Main Supply
Reserve
N2
2 - 20
50
Dewar 10'000 ltr.