Документ взят из кэша поисковой машины. Адрес оригинального документа : http://lnfm1.sai.msu.ru/kgo/docs/specification2.5.7.6.doc Дата изменения: Fri Dec 8 11:21:57 2006 Дата индексирования: Mon Oct 1 23:02:15 2012 Кодировка:

Moscow State University
Sternberg Astronomical Institute

Specification

2.5 m telescope with enclosure
version 7.6

|Number|Item description, type |Quanti|
| | |ty, |
| | |notes |
|1000 |2.5 m mirror telescope system |1 |
| |optics and related mechanical characteristics: | |
|1001 |Primary mirror M1, with light diameter 2.5m, fabricated | |
| |from the material with near zero coefficient of expansion| |
| |(Sitall or Zerodur). The mirror cell (the support, | |
| |ventilation, or cooling system) and the shape | |
| |(lightweighting) must provide the short time of | |
| |relaxation to environment conditions to avoid mirror | |
| |seeing. | |
|1002 |Convex secondary mirror M2 fabricated from similar | |
| |material to the primary provides telescope focal ratio | |
| |F/8. Central obscuration of no more than 15% area is | |
| |allowed including blinds. The secondary mirror cell is | |
| |mounted on a remotely controlled hexapod. | |
|1003 |Two mirror system must be optimized without a corrector | |
| |to have the flat field of view of 10 arcmin diameter and | |
| |with the image quality better than 80% encircled energy | |
| |in 0.2 arc seconds diameter. | |
|1004 |The support systems of the primary and secondary mirrors | |
| |must provide the demanded image quality non depending on | |
| |the telescope elevation. | |
|1005 |One Cassegrain focal station C1 and four Nasmyth focal |N3 and|
| |stations (ports) must be provided. Two main Nasmyth |N4 |
| |stations are located at the central holes of the |ports |
| |elevation axles and two additional ("student ports") are |are |
| |oriented at 90 and 270 degrees with respect to the |option|
| |elevation axis. First main Nasmyth station N1 must |al |
| |provide the unvignetted field of view (FOV) 40 arcmin in | |
| |diameter; opposite station N2 must provide FOV 15 to 20 | |
| |arcmin (depending on axle mechanical restrictions), the | |
| |additional ports N3 and N4 all have 15 arcmin FOV. The | |
| |optical clearance for the C1 station must provide at | |
| |least 1 degree unvignetted FOV. | |
|1006 |Nasmyth focal stations must be provided with a deployable| |
| |tertiary mirror M3 assembly allowing switching between | |
| |Cassegrain and any of the Nasmyth focal station during | |
| |normal telescope operation. M3 is fabricated from the | |
| |material similar to the primary. Its assembly must not | |
| |give additional light obscuration or vignetting when | |
| |passing light to Cassegrain station. Switching should | |
| |take not more than 2 minutes and must provide the | |
| |pointing repeatability not worse than 2 arcsec rms (max | |
| |deviation 6 arcsec) for any Nasmyth station. | |
|1007 |All telescope mirrors must be coated high reflecting Al | |
| |(R>88%) with a protecting SiO2 layer. Work range of the | |
| |telescope is optical and near-infrared (0.3 - 2.2 mu). | |
|1008 |A wide field corrector assembly at the Cassegrain focal | |
| |station C1 must provide an unvignetted corrected FOV 40 | |
| |arc minutes diameter with optimal image quality (better | |
| |than 80% encircled energy in 0.3 arc seconds diameter). | |
| |The corrector must be fabricated from fused quartz and | |
| |optical surfaces must be AR coated optimized for blue | |
| |spectral region. Corrector must be engineer-mode | |
| |(day-time) installable/removable. | |
|1009 |The wide field corrector similar to that for Cassegrain | |
| |station must fit the wide-field Nasmyth station N1 and | |
| |must be engineer-mode removable. | |
|1010 |The removable automatic Atmospheric Dispersion Corrector |option|
| |with FOV not less than 12 arcmin is provided in station | |
| |N2 for needs of long-slit spectroscopy. | |
| |Instrument stations and interfaces: | |
|1020 |The Cassegrain focal station is equipped with an | |
| |instrument adaptor containing the mechanical field | |
| |derotator, rotating instrument interface (flange), and | |
| |acquisition/guidance unit (AGU). Field derotator must | |
| |provide the unguided rotation tracking accuracy 0.15 | |
| |arcsec rms at a distance 20 arcmin from the center of FOV| |
| |(0.4 arcmin of position angle) during 1 hour integration | |
| |at any allowed azimuth and elevation. AGU must be capable| |
| |of selecting the guide star in the distance range from 5 | |
| |arcmin from center of the FOV to its boundary. | |
|1021 |The wide-field Nasmyth station N1 is equipped with the | |
| |instrument adaptor (derotator, instrument interface, AGU)| |
| |similar or identical to the adaptor of Cassegrain | |
| |station. | |
|1022 |The narrow-field Nasmyth station N2 is equipped with the | |
| |optical field derotator compatible with the ADC unit. It | |
| |must be engineer-mode removable | |
|1023 |Additional Nasmyth stations N3 and N4 represent openings | |
| |in the central section of the tube with 4 instrument | |
| |fixing holes (thread M10) and closed with lids when not | |
| |in use. | |
|1024 |Wide field corrector(s) (when installed) must not extend | |
| |beyond the instrument flange. Backfocus distance is 300 | |
| |to 500 mm in C1 and not less than 200 mm in N1, N2. | |
| |Maximal load for C1 station is 250 kg, for N1, N2 | |
| |stations is 400 kg and for N3, N4 is 25 kg. | |
| |C1 clearance is not less than 1.5 m; N1, N2 must provide | |
| |space 1 m from instrument flange along light beam and +/-| |
| |75 cm across beam horizontal and 1 m down to the | |
| |platform. | |
| |Tube | |
|1030 |The tube is assumed made of Serrurier trusses. Mirrors M1| |
| |and M3 must have remotely driven covers. The M2 and | |
| |near-M1 baffles should be designed to prevent the stray | |
| |light in detector area in Nasmyth and Cassegrain | |
| |stations. | |
|1031 |The M2 unit must provide the fine focussing with a | |
| |provision of the automatic focus correction using the | |
| |temperature data from the distributed sensors and/or from| |
| |the AGU image data. | |
|1032 |M1, M2 and M3 cells must allow easy removal/installation | |
| |of mirrors for reflective layer re-coating. Corresponding| |
| |means (damped protection cases, covers etc.) for their | |
| |safe transportation to another observatory coating plant | |
| |must be provided. | |
| |Mount | |
|1100 |The telescope mount is alt-azimuth. The azimuth axis | |
| |will have hydrostatic bearings and will provide the | |
| |azimuth range -270 degrees to +270 degrees. The elevation| |
| |axis on roller (or hydrostatic) bearings must provide | |
| |smooth non-sticking tracking and least problematic | |
| |maintenance; the elevation range must be 0 to +90 | |
| |degrees. The first eigenfrequency of at least 7Hz must be| |
| |provided by the rigid mount structure. | |
|1101 |The zenith blind spot will be no larger than 2 degrees | |
| |around zenith. | |
|1102 |The pointing of at least 3 degree per second must be | |
| |provided. The pointing accuracy of the telescope must be | |
| |better than 3 arcsec rms (max deviation 5 arcsec). | |
|1103 |Unguided tracking accuracy over a period of 600 seconds | |
| |must be 0.2 arc seconds rms (max deviation 0.4 arcsec); | |
| |guided tracking accuracy over a period of 3 hours must be| |
| |0.2 arc seconds rms. | |
| |Telescope control system and environment conditions | |
|1201 |The control system hardware (power electronic units) must| |
| |be located in racks which are assembled in a separate | |
| |control room (some 10 meters from the dome). All the | |
| |heat sources which cannot be detached from the mount must| |
| |be carefully isolated and/or cooled to prevent heat | |
| |fluxes from surfaces. | |
|1202 |Cable channels in the mount must provide the space for | |
| |the control lines of the attached instrumentation | |
| |(optical fibre lines, twisted pairs etc.) from the | |
| |instrument stations to the control room. | |
|1203 |The specialized computers must be provided for the | |
| |telescope control needs having the high reliability level| |
| |(industrial standards) which will be located in the | |
| |control room. | |
|1204 |It is assumed that the telescope must operate to | |
| |specification within the operating conditions: -20 | |
| |degrees centigrade to +25 degrees centigrade; relative | |
| |humidity 5% to 90%; wind speed to 60 km/hour; maximal | |
| |snow layer not more than 1 meter. The telescope | |
| |installation is supposed near the Kislovodsk Solar | |
| |Station, 25 km from Kislovodsk, at an altitude of 2100m | |
| |(N 43o44', E 42o 32'). | |
|1300 |Telescope spares and consumables for two years, tooling |1 |
| |for maintenance | |
|1400 |Technical service contract for the telescope for an |1 |
| |initial five year period with yearly visits. | |
|1401 |Education of the russian personnel (3-5 persons) during 2| |
| |weeks on a telescope assembly stage. | |
| | | |
| |Instrumentation | |
|2000 |Scientific CCD camera 4Kx4K with shutter and filters |1 |
|2001 |Based on 2 back-illuminated buttable 15mu pixel devices | |
| |(e.g. CCD44-82bi) with astronomy broad band AR coating. | |
| |Readout noise not more than 3e. | |
|2002 |The camera controller electronics delivers a | |
| |digitisation depth of 16 bits, programmable readout rate,| |
| |providing readout noise less than 3e at 200 Ks/s, | |
| |programmable camera gain. Cable between camera and PC | |
| |must be not less than 50 meter long. | |
|2003 |High-reliability low-maintenance cryostat with closed | |
| |cycle cooler of CRYOTIGER type (cools down to 140K). | |
|2004 |Two computers under Linux OS must provide data | |
| |acquisition and data storage in FITS format. | |
|2005 |Camera shutter must provide unvignetted CCD field, | |
| |minimal exposure 100 ms and equality of exposures in any| |
| |field point with 2 ms precision. | |
|2006 |A filter wheel assembly mechanism must contain a double | |
| |wheel, each capable of independent operation, and each | |
| |with 5 (or 6) positions, capable of accommodating filters| |
| |100 mm in diameter. Set of U,B,V,R, I, H-alpha (fwhm 5nm | |
| |@ 656 nm) filters must be supplied. Filters are operated | |
| |remotely. Change between adjacent filters must take 1-3 | |
| |seconds. Filter setting precision must provide | |
| |repeatability of not worse than 10 mu. | |
|2100 |Long-slit spectrograph |1 |
|2101 |A provision of a long-slit low-resolution high-throughput|option|
| |spectrograph is to be considered. Spectrograph must | |
| |provide several resolutions of 1500 to 10000 with help of| |
| |a holographic grating dispersion element. Collimator is a| |
| |parabolic f/8 mirror, camera lens must provide the | |
| |R=10000 resolution in spectral region 300 - 11000 nm on | |
| |backside illuminated CCD 2K x 4K (e.g. CCD44-82bi) | |
| |cooled by CRYOTIGER. Additional CCD slit-viewing camera | |
| |must provide guiding and centring the target. Several | |
| |slits of different width and with a beam | |
| |splitter/condenser option are installed on a motorized | |
| |wheel and are inclined to let the reflected light in a | |
| |CCD camera via a suitable re-imaging lens. The pre-slit | |
| |unit must reserve the beam escaping (using insertable 45 | |
| |degree mirror) into the future high resolution | |
| |spectrograph installed nearby and contains also the | |
| |calibration lamps set. Detailed specifications will | |
| |follow later. | |
|2200 |Near-infrared camera |1 |
|2201 |Camera 1K x 1K with a J,H,K-filters wheel (1.2,1.6,2.2 |option|
| |mu) with a cryostat and controller to be installed in C1 | |
| |port. | |
|2300 |Observations support automatic telescope with cameras |1 |
|2301 |Reflecting telescope on an automatic fast equatorial |option|
| |mount (pointing 10 degree/sec with 10 arcsec rms | |
| |precision) with D=500mm and f/3.8. Will be used for | |
| |photometric support of 2.5m observations (extinction | |
| |monitoring, synchronized multi-channel photometry etc.) | |
| |and installed outside its enclosure. | |
|2302 |Peltier cooled front-illuminated CCD cameras 4Kx4K |option|
| |Alta16U grade 2. | |
| | |4 |
| | | |
|3000 |Enclosure |1 |
|3001 |The dome of an appropriate size must be provided. The | |
| |fixed part maintains the suitable support of the rotating| |
| |part and will be installed on a concrete walls of the | |
| |observatory building designed according to the telescope | |
| |and dome specifications. | |
| |Rotation with speeds 0.01 to 4 deg/sec; slit open/close | |
| |time 2 minutes or less. | |
|3002 |Dome walls are clad with 10cm foam-like insulation to | |
| |lower the power consumption of the climatic system of the| |
| |dome interior. External surface has a high reflection and| |
| |durability coating. Dome and telescope structure and | |
| |power systems must be optimized for preventing the | |
| |significant dome seeing with help of the remote | |
| |controllable louvers and/or ventilation system. The | |
| |ventilation system must provide continuous air extracting| |
| |from the dome during observations. Climate-control system| |
| |must provide the interior temperature stabilized with the| |
| |next night expected temperature. | |
|3003 |The crane for mirrors removal/installation and telescope | |
| |maintenance must be provided, as well as the carriages | |
| |and tooling for mirrors and instruments transportation. | |
| |All the technological process of the mirrors | |
| |(de)installation for the surfaces recoating must be | |
| |supported in details. | |
|3004 |Dome must withstand wind gusts of up to 30m/s when open | |
| |and 50m/s when closed. Rain-proof for storms up to 20m/s.| |
|3005 |The maximal detected earthquake load during last century | |
| |in the 100km neighborhood is M=6.5 magnitude (Richter | |
| |scale); the Maximal likelihood earthquake (probability of| |
| |exceeding during 50yr is 10%) is about M=7 with the peak | |
| |ground acceleration of 3.2-4m/s^2. | |
|3006 |Mechanical interfaces of the enclosure and telescope with| |
| |the dome building must be provided. The specifications, | |
| |drawings and all the relevant information must be | |
| |provided during first 6 months of the contract to enable | |
| |the development of the construction documentation for the| |
| |dome building and concrete telescope pier. | |
| | | |
| |Auxiliary components | |
|4000 |Hardware for remote and fully robotic operation of the |1 |
| |telescope. Engineering panel for driving the telescope | |
| |and enclosure. | |
|4010 |Reference time system providing high accuracy UT (better |1 |
| |than 0.1 ms, e.g. based on a GPS receiver) | |
|4020 |Automatic meteostation must be provided and installed |1 |
| |outside the enclosure at a 20m distance from telescope | |
| |and 5m elevation and connected to the Environment Control| |
| |System. | |
|4030 |Complete cabling set for the telescope and dome control |1 |
| |and scientific equipment | |
| | | |
| |Software | |
|5000 |Telescope Control System (TCS) software and firmware. |1 |
| |Realtime part must provide correct, fast and robust | |
| |management of axes encoders and motors and other less | |
| |response-demanding system components. Safety system must | |
| |provide protection against collisions and proper | |
| |interlocks. Upper level user interface software must work| |
| |under OS Linux. | |
|5010 |Dome Control System (DCS) for managing the rotation |1 |
| |(synchronized with telescope), slit opening/closing, | |
| |ventilation, air conditioning (maintaining the thermal | |
| |equilibrium of the telescope mount and mirrors with the | |
| |next observing night expected temperature) and mirror | |
| |covers. | |
|5020 |Autoguider Control System (ACS) for selection of a |1 |
| |guiding star near the science field, driving the AGU | |
| |sliding mechanism to it and guiding during all the | |
| |scientific observations | |
|5030 |Instrument Control System (ICS) prototypes for the |1 |
| |supplied instrumentation (imaging camera with a shutter | |
| |and filters assembly and others) as examples of the | |
| |integration of the instrument software in the single | |
| |system driven by OCS. | |
|5040 |Meteostation and weather forecast interface for handling |1 |
| |the observing conditions (ECS - environment control | |
| |system) | |
|5050 |Observatory Control System (OCS) which is the highest |1 |
| |level software integrating the TCS, DCS, ACS, ECS and ICS| |
| |components which allows the fully remote (via Internet) | |
| |controllable system functioning and provides the user | |
| |with convenient interface for observations management. | |
|5099 |The upper logical level software must be provided with | |
| |open sources. | |
| | | |
|6000 |Full site installation of the 2.5 m telescope and |1 |
| |enclosure. | |
|6001 |Transport to Kislovodsk (railroad) and further to the | |
| |Kislovodsk Solar Station, 25 km from Kislovodsk, by auto | |
| |road at an altitude of 2100m, last 5 km are unpaved. | |
|6002 |Final alignment, testing, commissioning | |
| |Documentation | |
|7000 |Complete technical documentation with drawings for | |
| |telescope, enclosure and related hard- and software; the | |
| |maintenance manual and schedule. | |