The optical module of the Baikal deep underwater neutrino telescope

A deep underwater Cherenkov telescope has been operating since 1993 in stages of growing size at 1.1 km depth in Lake Baikal. The key component of the telescope is the Optical Module (OM) which houses the highly sensitive phototube QUASAR-370. We describe design and parameters of the QUASAR-370, the layout of the optical module, the front-end electronics and the calibration procedures, and present selected results from the five-year operation underwater. Also, future developments with respect to a telescope consisting from several thousand OMs are discussed.Comment: 30 pages, 24 figure

The Lake Baikal telescope NT-36 A first deep underwater multistring array

Since April 13th, 1993 the underwater Cherenkov telescope NT-36 consisting of 36 photomultipliers attached to 3 strings, is operated in lake Baikal. We describe this first stationary underwater multistring array and present results from the first months of operation. (orig.)Available from TIB Hannover: RA 2999(94-049) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

The Lake BAIKAL Neutrino Project: Status Report

A first large deep underwater detector for muons and neutrinos, NT-200, is currently under construction in Lake Baikal. Part of the detector consisting of 36 optical modules (NT-36) has been operated over nearly 2 years in 1993 and 1994. With this detector not only methodical questions are investigated, but also some problems in the field of astroparticle physics, cosmic ray physics and limnology. In March 1995, a 72-PMT version was deployed. We describe the construction of the detector and the present status of the project and review some of the results. 1 The NT-200 Detector The Baikal Neutrino Telescope [1] is being deployed in the Siberian Lake Baikal, about 3.6 km from shore at a depth of 1.1 km. In April 1993 we put into operation the stationary 3-string detector NT-36, since April 1994 a modified version of NT-36 was taking data. An array carrying 72 PMTs has been deployed in March 1995. These arrays are steps towards the Neutrino Telescope NT-200 which will consist of 192 opti..

The Baikal underwater neutrino telescope: Design, performance and first results

A first deep underwater detector for muons and neutrinos, NT-200, is currently under construction in Lake Baikal. Part of the detector, NT-36, with 36 photomultiplier tubes at three strings, has been installed in 1993. This array allowed for the first time a three-dimensional mapping of Cherenkov light deep underwater. Since then, various arrays have been almost continuously taking data. Presently a 96-PMT array is operating. We describe the NT-200 detector design and present results obtained with NT-36. (orig.)SIGLEAvailable from FIZ Karlsruhe / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Search for neutrinos from the core of the earth with the Baikal Underwater Detector NT-36

The first stage of the Baikal Neutrino Telescope NT-200, the detector NT-36, was operated from 1993 to 95. The data obtained with this small array were analysed to search for vertically upward muons. Apart from neutrinos generated in the atmosphere at the opposite side of the Earth, such muons might be due to neutrinos produced in neutralino annihilations in the center of the Earth. We have selected two clear neutrino candidates. From this, an 90%CL upper limit of 1.3 x 10^-13 muons cm^(-2) sec^(-1) in a cone with 15 degree half-aperture around the opposite zenith is obtained for muons due to neutralino annihilation