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GEO600

GEO600 is a gravitational wave detector located near Sarstedt in the South of Hanover, Germany. This instrument, and its sister interferometric detectors, when operational, are some of the most sensitive gravitational wave detectors ever designed. They are designed to detect relative changes in distance of the order of 10⁻²¹, about the size of a single atom compared to the distance from the Sun to the Earth. GEO600 is capable of detecting gravitational waves in the frequency range 50 Hz to 1.5 kHz. Construction on the project began in 1995.

Hardware

GEO600 is a Michelson interferometer. It consists of two 600 meter long arms, which the laser beam passes twice, so that the effective optical arm length is 1200 m. The major optical components are located in an ultra-high vacuum system. The pressure is in the range of 10⁻⁸ mbar.

Suspensions and seismic isolation

For precise measurements, the optics must be isolated from ground motion and other influences from the environment. For this reason, all ground-based interferometric gravitational wave detectors suspend their mirrors as multi-stage pendulums. For frequencies above the pendulum resonance frequency, pendulums provide a good isolation against vibrations. All the main optics of GEO600 are suspended as triple pendulums, to isolate the mirrors from vibrations in the horizontal plane. The uppermost and the intermediate mass are hung from cantilever springs, which provide isolation against vertical movement. On the uppermost mass are six coil- magnet actuators that are used to actively dampen the pendulums. Furthermore, the whole suspension cage sits on piezo crystals. The crystals are used for an ‘active seismic isolation system’. It moves the whole suspension in the opposite direction of the ground motion, so that ground motion is cancelled.

Max Planck

Max Karl Ernst Ludwig Planck, FRS (/plɑːŋk/; 23 April 1858 – 4 October 1947) was a German theoretical physicist whose work on quantum theory won him the Nobel Prize in Physics in 1918.

Planck made many contributions to theoretical physics, but his fame as a physicist rests primarily on his role as an originator of quantum theory, which revolutionized human understanding of atomic and subatomic processes. However, his name is also known on a broader academic basis, through the renaming in 1948 of the German scientific institution, the Kaiser Wilhelm Society (of which he was twice president), as the Max Planck Society (MPS). The MPS now includes 83 institutions representing a wide range of scientific directions.

Early life and career

Planck came from a traditional, intellectual family. His paternal great-grandfather and grandfather were both theology professors in Göttingen; his father was a law professor in Kiel and Munich.

Planck was born in Kiel, Holstein, to Johann Julius Wilhelm Planck and his second wife, Emma Patzig. He was baptised with the name of Karl Ernst Ludwig Marx Planck; of his given names, Marx (a now obsolete variant of Markus or maybe simply an error for Max, which is actually short for Maximilian) was indicated as the primary name. However, by the age of ten he signed with the name Max and used this for the rest of his life.

Dalai Lama

The Dalai Lama /ˈdɑːlaɪ ˈlɑːmə/ is a monk of the Gelug or "Yellow Hat" school of Tibetan Buddhism, the newest of the schools of Tibetan Buddhism founded by Je Tsongkhapa. The 14th and current Dalai Lama is Tenzin Gyatso.

The Dalai Lama is considered to be the successor in a line of tulkus who are believed to be incarnations of Avalokiteśvara, the Bodhisattva of Compassion, called Chenrezig in Tibetan. The name is a combination of the Mongolic word dalai meaning "ocean" (being the translation of the Tibetan name, 'Gyatso') and the Tibetan word བླ་མ་ (bla-ma) meaning "guru, teacher, mentor". The Tibetan word "lama" corresponds to the better known Sanskrit word "guru".

From 1642 until the 1950s (except for 1705 to 1750), the Dalai Lamas or their regents headed the Tibetan government or Ganden Phodrang which governed all or most of the Tibetan plateau from Lhasa with varying degrees of autonomy, up to complete sovereignty. This government also enjoyed the patronage and protection of firstly Mongol kings of the Khoshut and Dzungar Khanates (1642–1720) and then of the emperors of the Manchu-led Qing dynasty (1720–1912).

LIGO

The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory to detect gravitational waves. Cofounded in 1992 by Kip Thorne and Ronald Drever of Caltech and Rainer Weiss of MIT, LIGO is a joint project between scientists at MIT, Caltech, and many other colleges and universities. Scientists involved in the project and the analysis of the data for gravitational-wave astronomy are organised by the LIGO Scientific Collaboration which includes more than 900 scientists worldwide, as well as 44,000 active Einstein@Home users. LIGO is funded by the National Science Foundation (NSF), with important contributions from the UK Science and Technology Facilities Council, the Max Planck Society of Germany, and the Australian Research Council. By mid-September 2015 "the world's largest gravitational-wave facility" completed a 5-year US$200-million overhaul at a total cost of $620 million. LIGO is the largest and most ambitious project ever funded by the NSF.