LHCb installs its precision silicon detector

One of the most fragile detectors for the Large Hadron Collider beauty (LHCb) experiment has been successfully installed in its final position. LHCb is one of four large experiments at CERN’s Large Hadron Collider (LHC), expected to start up in 2008.

For the LHCb collaboration, including UK scientists from the Universities of Liverpool and Glasgow, installing the Vertex Locator (VELO) detector into its final location in the underground experimental cavern at CERN has been a challenging task.

“It was a very delicate operation”, said Paula Collins, LHCb-VELO project leader, “With its successful completion, the VELO is now in place and ready for physics.”

Professor Themis Bowcock, lead LHCb scientist from the University of Liverpool where the intricate instrumentation was built and assembled said, “This is a big milestone for VELO and marks an end to the construction side of the project. With each one of the 42 modules that make up the instrument taking 1,000 hours to construct the final installation was a nail biting experience.”

The VELO is a precise particle-tracking detector that surrounds the proton-proton collision point inside the LHCb experiment. At its heart are 84 half-moon shaped silicon sensors, each one connected to its electronics via a delicate system of more than 5000 bond wires. These sensors will be located very close to the collision point, where they will play a crucial role in detecting b quarks, to help in understanding tiny but crucial differences in the behaviour of matter and antimatter.

The sensors are grouped in pairs to make a total of 42 modules, arranged in two halves around the beam line in the VELO vacuum tank. An aluminum sheet just 0.3 mm thick provides a shield between the silicon modules and the primary beam vacuum, with no more than 1 mm of leeway to the silicon modules. Custom-made bellows enable the VELO to retract from its normal position of just 5 mm from the beam line, to a distance 35 mm. This flexibility is crucial during the commissioning of the beam as it travels round the 27-km ring of the LHC.

“The installation was very tricky, because we were sliding the VELO blindly in the detector,” said Eddy Jans, VELO installation coordinator. “As these modules are so fragile, we could have damaged them all and not realized it straight away.” However, the verification procedures carried out on the silicon modules after installation indicated that no damage had occurred.

Dr Chris Parkes, scientist from the University of Glasgow LHCb team, who were responsible for testing the modules, adds, “Now that the VELO is in place we can start work on testing the instrument in situ in the lead up to science operations next year.”

UK scientists have a major involvement with the Vertex Locator. The individual modules were designed and assembled at Liverpool University and scientists from Glasgow University are responsible for the reception and testing of modules at CERN. NIKHEF provided the special foil that interfaces with the LHC vacuum.  Other collaborators are EPFL Lausanne, CERN, Syracuse and MPI Heidelberg.

Contacts

Gill Ormrod – Science and Technology Facilities Council Press Office
Tel: +44 (0) 1793 442012
Mobile: +44 (0) 781 8013509

CERN Press Office
Tel: +44 22 767214

Kate Spark – University of Liverpool Press Office
Tel: +44 (0) 151 794 2247

Martin Shannon - University of Glasgow Press Office
Tel: +44 (0) 141 330 8593

UK Science Contacts

Professor Themis Bowcock – Lead LHCb scientist at the University of Liverpool
Tel: +44 (0) 151 794 3315

Dr Tara Shears – LHCb scientist, University of Liverpool
Tel: +44 (0) 151 7943315

Dr Chris Parkes – LHCb scientist, University of Glasgow
Tel: +44 (0) 141 330 5885

Notes to Editors

LHCb collaboration

Like all the detector experiments at CERN a worldwide team of scientists are involved in the design and construction of LHCb. The experiment involves 663 scientists from 47 institutes and universities in 15 countries. UK collaborators make up around 20% of this.

Websites – including images of LHCb and VELO
CERN website (link opens in a new window)
UK LHC website (link opens in a new window)
University of Liverpool VELO website (link opens in a new window)
LHCb public page
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