Editing MAGIC (telescope) (section)

==Technical specifications==
[[File:Magicmirror.jpg|thumb|MAGIC on a sunny day]]
[[File:Tiles of a MAGIC telescope.jpg|thumb|Individual segments of a MAGIC telescope]]
Each telescope has the following specifications:
*A collecting area 236 m<sup>2</sup> consisting of 956 50&nbsp;cm&nbsp;×&nbsp;50&nbsp;cm [[aluminium]] individual reflectors
*A lightweight [[carbon fibre]] frame
*A detector consisting of 396 separate hexagonal photomultiplier detectors in the center (diameter: 2.54&nbsp;cm) surrounded by 180 larger photomultiplier detectors (diameter: 3.81&nbsp;cm).
*Data are transferred in analogue form by [[fibre optic]] cables
*Signal digitization is done via an ADC (analog-to-digital converter) with a 2&nbsp;GHz sampling rate
*Total weight of 40,000&nbsp;kg
*Reaction time to move to any position of the sky less than 22 seconds<ref name="Cortina_2004">{{Cite journal|arxiv=astro-ph/0407475|last1= Cortina|first1= J.|title= Status and First Results of the MAGIC Telescope|journal= Astrophysics and Space Science|volume= 297|issue= 2005|pages= 245–255|author2= for the MAGIC collaboration|year= 2005|doi= 10.1007/s10509-005-7627-5|bibcode = 2005Ap&SS.297..245C |s2cid= 16311614}}</ref>

Each mirror of the reflector is a sandwich of an aluminum [[Honeycomb structure|honeycomb]], 5&nbsp;mm plate of AlMgSi alloy, covered with a thin layer of [[quartz]] to protect the mirror surface from aging. The mirrors have spherical shape with a curvature corresponding to the position of the plate in the [[paraboloid]] reflector. The [[reflectivity]] of the mirrors is around 90%. The focal spot has a size of roughly half a pixel size (<0.05°).

Directing the telescope to different elevation angles causes the reflector to deviate from its ideal shape due to the gravity. To counteract this deformation, the telescope is equipped with an [[Active optics|Active Mirror Control]] system. Four mirrors are mounted on each panel, which is equipped with [[actuator]]s that can adjust its orientation in the frame.

The signal from the detector is transmitted over 162&nbsp;m of optical fibers. The signal is digitized and stored in a 32&nbsp;kB ring buffer. The readout of the ring buffer results in a dead time of 20&nbsp;μs, which corresponds to about 2% dead time at the design trigger rate of 1&nbsp;kHz. The readout is controlled by an [[FPGA]] ([[Xilinx]]) chip on a PCI (MicroEnable) card. The data is saved to a [[RAID0]] disk system at a rate up to 20&nbsp;MB/s, which results in up to 800&nbsp;GB raw data per night.<ref name="Cortina_2004"/>