Guardians of the antimatter hunter


AMS-02 inside the ESTEC Test Centre’s Maxwell electromagnetic radiation chamber for electromagnetic compatibility and interference testing in February 2010

Credits: ESA

Guardians of the antimatter hunter

31 July 2012
A year ago, the largest and most complex scientific instrument on the International Space Station was delivered to the orbital outpost. Searching for antimatter and the origins of our Universe, it is working flawlessly thanks to the continuous support from its own ‘mission control’.


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The AMS-02 Alpha Magnetic Spectrometer uses state-of-the-art detectors and powerful magnets to detect cosmic rays as they pass through matter. Around 90% of the Universe is invisible – and AMS-02 is searching for the missing pieces.

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The second Alpha Magnetic Spectrometer (AMS-02) on the International Space Station.

Delivered by Space Shuttle mission STS-134 in 2011, AMS-02 is a state-of-the-art cosmic-ray detector designed to examine fundamental properties of matter and the origin of the Universe.

Scientists are looking for a better understanding of antimatter and dark matter, searching for phenomena which exist in nature that have not yet been imagined nor discovered.

Credits: NASA

ESA astronaut Roberto Vittori and five NASA astronauts flew AMS-02 to the International Space Station on Shuttle Endeavour’s last mission STS-134. 600 scientists in 16 countries worked together to build AMS-02. Designed by scientists for ‘plug and play’ on the Station, it was sending back data back within four hours of being installed.

The Station is subjected to the full blast of cosmic rays because it is not protected by Earth’s atmosphere, making it the ideal place to search for antimatter.

In one year, AMS-02 has recorded more than 17 billion particles.

The huge amount of information is sent via satellite to the USA and then through optical cables to the control centre run by the European Organization for Nuclear Research, CERN, in Switzerland.

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The second Alpha Magnetic Spectrometer (AMS-02) Control Centre in CERN, Switzerland. From here the state-of-the-art cosmic-ray detector is callibrated, kept at working temperatures and all data is stored for analysis.

Credits: ESA

Everything is stored for analysis. Every hour, the centre receives 240 gigabytes of information for archiving – about the size of a typical consumer hard disk.

The control centre also monitors the instrument’s vital signs, keeping its temperature stable despite being subjected to its surroundings swinging between –30ºC to +40ºC in the harsh space conditions.

Subatomic particles are extremely small and proving their existence requires extreme precision. AMS-02 is constantly calibrated to guarantee true readings. For example, the particle detector used to tell electrons from protons can be adjusted by as little as three-thousandths of a millimetre.

At this level of accuracy, natural events such as solar flares can add errors and the mission controllers at CERN need to allow for them during calibration.

The centre never closes: “Scientists are working round the clock looking at particles that affect us all the time,” says Maurice Bourquin, professor at the University of Geneva and founding father of AMS-02.

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The six STS-134 astronauts at NASA Kennedy Space Center’s Shuttle Landing Facility in Florida on 26 April 2011 prior to final launch preparations for Space Shuttle Endeavour’s mission to the International Space Station.

From left are Mission Specialists Greg Chamitoff, Andrew Feustel, Commander Mark Kelly, Pilot Greg H. Johnson, Mission Specialist Mike Fincke and Roberto Vittori.

Endeavour and its crew delivered the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the station. This was the final spaceflight for Endeavour.

Credits: NASA/Kim Shiflett (KSC 2011-3071)

The control centre was formally opened on 25 July by the NASA astronauts who flew AMS to the Station. They unveiled a plaque and planted a tree with principal investigator Prof. Samuel Ting and CERN director Rolf-Dieter Heuer to mark the occasion.

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