CMS tracking detector successfully installed

Dec 18, 2007
CMS tracking detector successfully installed
Installation of the world's largest silicon tracking detector in the CMS experiment at CERN.

Installation of the world’s largest silicon tracking detector was today successfully completed at CERN. In the early hours of Thursday 13 December the CMS Silicon Strip Tracking Detector began its journey from the main CERN site to the CMS experimental facility. Later that day it was lowered 90 metres into the CMS cavern. Installation began on Saturday 15 December and was concluded this morning.

“This achievement completes the installation of sub-detectors inside the CMS magnet, which was lowered into the cavern on 28 February,” said CMS technical coordinator Austin Ball. “It’s a big milestone for us.”

With a total surface area of 205 square metres, about the same as a singles tennis court, the CMS Silicon Strip Tracking Detector is by far the largest semiconductor silicon detector ever constructed. Its silicon sensors are patterned to provide a total of 10 million individual sensing strips, each of which is read out by one of 80,000 custom designed microelectronics chips. Data are then transported via 40,000 optical fibres into the CMS data acquisition system.

“The complete system operating at the LHC will produce data at a higher rate than the entire global telephone system,” said project manager Peter Sharp.

The silicon sensors are precision mounted onto 15,200 modules that are in turn mounted onto a very low mass carbon fibre structure that maintains the position of the sensors to less than the diameter of a human hair (100 microns).

“Each of the charged particles produced in LHC particle collisions at the heart of the CMS detector will be tracked with a precision of better than 20 microns,” said Sharp.

Final assembly of the silicon tracking detector began in December 2006 and was completed in March 2007. All of the systems were then fully commissioned, with 20% of the full detector operated over several months during which five million cosmic ray tracks were recorded. The results from these data were then rapidly analyzed using the CMS Grid-based distributed computing system. This commissioning demonstrated that the detector fully meets the experiment’s requirements.

“Constructing a scientific instrument of this size and complexity, designed to operate at the LHC without intervention for more than ten years, is a major engineering and scientific achievement,” said CMS spokesman Tejinder Virdee. “More than five hundred scientists and engineers from fifty-one research institutions world-wide have contributed to the success of the project.”

Institutions involved in the CMS tracker project are located in Austria, Belgium, CERN, Finland, France, Germany, Italy, Switzerland, the United Kingdom and the United States.

CMS is a worldwide collaboration comprising over 2500 scientists and engineers from 180 institutes in 38 countries and regions. These are Armenia, Austria, Belarus, Belgium, Brazil, Bulgaria, China, Colombia, Croatia, Cyprus, Estonia, Finland, France, Georgia, Germany, Greece, Hungary, India, Iran, Ireland, Italy, Korea, Lithuania, Mexico, New Zealand, Pakistan, Poland, Portugal, Russian Federation, Serbia, Spain, Switzerland, Taiwan, Turkey, Ukraine, United Kingdom, United States of America and Uzbekistan.

Source: CERN

Explore further: X-ray powder diffraction beamline at NSLS-II takes first beam and first data

add to favorites email to friend print save as pdf

Related Stories

Making synthetic diamond crystals in a plasma reactor

Mar 21, 2014

Synthetic diamond crystals are of interest to many industrial sectors. Their unique properties make them a suitable material for numerous applications including lenses for high-energy laser optics, X-ray ...

CERN latest data shows no sign of supersymmetry – yet

Jul 25, 2013

Physicists at Liverpool played a significant role in the development of the VErtex LOcator (VELO), a precision silicon detector, at the core of LHCb. The VELO detector consists of 42 separate modules (shown here), which were ...

Tracking down smallest biomarkers

Nov 27, 2012

Microvesicles are smallest cell elements which are present in all body fluids and are different, depending on whether a person is healthy or sick. This could contribute to detecting numerous diseases, such ...

Understanding what's up with the Higgs boson

Jun 28, 2012

(Phys.org) -- CERN, the European Organization for Nuclear Research headquartered in Geneva, Switzerland, will hold a seminar early in the morning on July 4 to announce the latest results from ATLAS and CMS, ...

Eye of Gaia: Billion-pixel camera to map Milky Way

Jul 06, 2011

The largest digital camera ever built for a space mission has been painstakingly mosaicked together from 106 separate electronic detectors. The resulting "billion-pixel array" will serve as the super-sensitive ...

Recommended for you

Scientists film magnetic memory in super slow-motion

6 hours ago

Researchers at DESY have used high-speed photography to film one of the candidates for the magnetic data storage devices of the future in action. The film was taken using an X-ray microscope and shows magnetic ...

Particles, waves and ants

Nov 26, 2014

Animals looking for food or light waves moving through turbid media – astonishing similarities have now been found between completely different phenomena.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.