ATLAS BIS MDTwiring facility

• D. Fassouliotis• P. Ioannou• C. Kourkoumelis• V. Pancheluga• D. Pappas• E. Stefanidis• V. Birioukov (engineer from Protvino)

UNIVERSITY OF ATHENS

Visit our web-page at: http://www.phys.uoa.gr/Atlas/MDT

AIM:

Wire/check all the MonitoredWire/check all the Monitored

Drift Tubes for the ATLASDrift Tubes for the ATLAS

BIS chambersBIS chambers 30,000 !! Tubes – 128 chambers (8 layers)

Construction specifications……:Wire position ± 25 μm

Wire tension 350 ± 15 gr

Gas leak rate < 10-8 bar*l/sec at 3 bar

Leak at 3.4 kV (gain 1.6*105) < 2nA/m

……necessary to achieve such physics results :

H μμμμ

TO ACCOPLISH AIM:

Build a clean room•20±1 oC•Class 50,000

Develop a wiring table+wiring tools•Flat top•Tube holders•Alignment of two end-plug-holders•End-plug insertion (coaxility tube/end-plug)•Tube pressure crimping•Speed of wire threading•Wire tensioning

Develop on-line QA of tube construction parameters•Length check•End-plug/tube axis coaxiality•Wire tension

SITE WAS CERTIFIED ON MAY 1999

Greek delegate to CERN Council, Professor Emmanuel Floratos (front, centre), accompanied by members of the Greek team, with

the first ATLAS muon chamber built in Greece installed in the x-ray tomograph at CERN.

…the first precision chamber to come off a production line was built by a collaboration of three Greek universities and it arrived at CERN from Thessaloniki on 5 August. This chamber is the first complete model of 1200 that will be built around the world over the next few years.….

First ATLAS muon chamber arrives from Greek production line

CERN Bulletin 33/99; 16 August 1999

FIRST CHAMBER FROM 17 SITES IN 9 COUNTRIES TO PASS ALL TESTS (13 μm position fluctuation of wire)

CERN Courier, October 2000

Verifying the alignment of interferometer beam optics on the ATLAS

experiment's X-ray tomograph at CERN. A small muon chamber from

Greece, destined for the barrel region of the detector, is on the tomograph.

It went on to pass the test with its wires showing an average fluctuation

of just 13 m from their nominal positions. To pass the test, a chamber

has to score less than 20 m.

…Micromechanics

Electronics…

…Automation

The tools we use ….