TOF Gas System Project Overview

Content Prototype for Aging tests done for RPC’s TOF Gas System: parameters and module layouts. Special Technology: channel flow meter Materials List Components: selection, cleaning, procurement. Deliverables from TA1 Cost and Schedule

RPC Aging Test (ATLAS and CMS) Realistic test of chamber response with a closed loop gas system. Gas system uses as many final components as possible. Tests running since mid- June 2003 in GIF. First results show that the purification of these gases is feasible, but the use of regeneratable purifiers could be very tricky.

Overview

TOF Gas System Main Parameters (non-flammable)

Gas Circulation Loop Distribution units 2 independent Regulations. Pump Module Mixer Module Purifier Module

Purifier Module Twin column Purifier Module with inline regeneration. Note: At this stage it is unclear whether such a Purifier is suitable for the TOF detector.

Mixer Module 3 Primary gases Mixture : C 2 H 2 F 4 / iC 4 H 10 / SF 6 90% / 5% / 5% (non flammable) Permanent IR–analysis monitoring iC 4 H 10 concentration Fill and Run MFC for each gas

Pipe Summary To be checked by TOF Group existing new

Distribution Rack (One Unit) Flow Cells measuring input output flows Pressure controller Back-up gas for power faillures

PT100 Channel Flow Meter Flow Cell incorporated in input and output gas manifolds. Measurement Principle: 1)Measure ambient temperature. 2)Switch on heating current 3)Wait until T has risen by  T=20 o C. 4)Take last 50 points and fit slope. 5)Wait until cool down to ambient T. (~40 sec.) Measurement cycle time s Proposed by M. Bosteels Developed by: S. Haider, C. Zinoni + S. Morozov

Materials List To be checked by TOF Group

Cleaning, Component Selection + Procurement Many tests done for component purity. Arrangements with suppliers for grease free components are put in place. Extra cleaning for some components is done at CERN. (depends on requirements, serious congestion in cleaning CERN service) Numerous compatibility tests for radiation and B-field compatibility. All electrical and electronic components are tested. Simplified purchasing procedures arranged by SPL with many suppliers.

Work share for TOF Gas System TA1 will cover the design, procurement of components, construction and installation of the gas racks. Commissioning will entail several phases, and needs participation from the TOF group. Deliverables from TA1: –Gas system modules: Mixer, (Purifier), Circ. Rack, Pump, 2 Distribution racks and some (minimal) Analysis. –Control system for all modules, PLC’s, etc. (not the PC’s for the control room). –Documentation: schematics, technical descriptions, user instruction manuals, To be covered by ALICE TC or TOF Group: –Modifications to existing fixed piping network : SG to Plug and Plug to UX. –New gas piping for connections from Distribution Racks to Chambers. –Cabling between Zones: SG to Plug, Plug to UX, and any cables to the chambers. requires definition from detector group

Cost Estimate

Gas Installation Periods (as they are known today) TOF

Construction Schedule for Distribution units: Two Options: 1)Starting end 2004 for delivery in Disadvantage: risk schedule shift in ATLAS which makes this period very busy. 2)Starting end 2003, so in parallel (or before) with ATLAS construction. This is to be discussed and decided by September 2003.