Virgo was closely involved in the first ever observations of gravitational waves in 2015, along with the two LIGO detectors in the US. Such vibrations of space and time occur, according to Einstein's theory of relativity, when compact objects such as black holes collide. Gravitational waves make a new form of astronomy possible.
The leader for the Virgo application is Nikhef, which was already closely involved in the construction and an upgrade program for the detector, also with NWO Research Infrastructure funding (formerly NWO Investment Large). "Gravitational wave science is still an exciting challenge for the instrument makers at Nikhef. This investment allows us to apply special technology upgrades to further improve the Virgo detector," said Andreas Freise.
The new NWO budget is largely for new parts and components for the detector, particularly to make it even less sensitive to disturbing motions from the environment. This requires the design and construction of new sensors and facilities that actively keep the detector stationary. Nikhef has a prominent role in this, and is itself contributing 1.6 million for personnel.
Virgo detector
Virgo observes gravitational waves with interfering laser beams, which show distortions of the detector's kilometre-long arms. In 2018, Nikhef received 3.5 million NWO budget for, among other things, an optical filter cavity to reduce the quantum fluctuations of the laser beam. The new upgrade should further increase the availability of the beam for measurements.