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2701. ARC Projects
Larry Fiscelli and Shu-i Wang (UC), plus Mark Klaene and Jon Davis (APO) installed the echelle mount this morning. ... Prior to the start of installation, hatch covers are removed, pieces are unpacked, and the telescope mount is readied. The main truss (there are two) which help support the instrument. ... Larry finds the main truss supports are obstructed by the floor hatch angle. ... Pictured is the x/y motion gimbels installed on the main trusses. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/ARCprogress/Echelle1022/ech22.html -- 2.7 Кб -- 23.10.1998
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2702. Scale adjustment
... With this adjustment, the largest three-month range occurs in February-April and is 71 њF. The range for all year, still removing the January 1962 record low, is 88 њF. The expansion coefficient for aluminum alloy 6061 is 24.3 microns/m-њC while that for borosilicate glass E6 is 2.8 microns/m-њC. The expansion coefficient difference is 21.5 microns/m-њC. Combining this number with the scale factor equation from the previous section gives a coefficient of 0.207 mm/њC for primary motion. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19971020_PlugPlateScale/19971020.html -- 11.2 Кб -- 16.10.1998
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2703. SDSS Projects
Ron Miksa, Carl Lindenmeyer, and John Korienek, as well as Steve Bastian (all from FNL), were on site to install the new manipulator arm in the 2.5m support building. Not to break tradition, these photos are of the completed installation and those hard working folks are not pictured. Captions above photo . ... Note that the bay door is open. ... The arm swings out from the body of the manipulator, and the assembly is moved along the metal runners to position it in front of the plate cartridge. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19981010arm/arm.html -- 2.3 Кб -- 16.10.1998
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2704. SDSS Telescope Controls and Interlocks Commissioning
... Paul Czarapata, Glen Federwitz, John Anderson, and eventually Claudio Rivetta (all FNAL) were on site to commission the telescope's control and interlock systems. Angie Prosapio and Steve Bastian were also able to assist in this effort. Glen reviewed the newly printed wiring sheets and then compared and tested them to the interlock and control rack on the lower level. ... Despite the poor weather, the word is that commissioning of the interlock and controls system went as planned. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980721contcomm/contcomm.html -- 2.4 Кб -- 14.09.1998
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2705. SDSS Projects
These few pictures are an update on the progress/completion of selected SDSS projects. ... The collimating telescope (aluminum box on the left) will go back in the clean room for spectrographic work after the camera is back on the telescope. On the small workbench, Jon Brinkmann/APO is testing a power supply from the mosaic camera. A view of the paved and improved access road for the 3.5m enclosure. A view of the paved and improved road for the 2.5m enclosure. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980911update/update.html -- 2.2 Кб -- 11.09.1998
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2706. Optics Cleaning
... This document summarizes the cleaning guidelines to be followed during the maintenance of these optics. ... Never return unused cleaning fluid to the bottle and cap the bottle when not in use. Distilled water . ... NEVER STORE OR TRANSPORT CO2 TANKS IN DIRECT SUNLIGHT OR A WARM CONFINED SPACE SUCH AS THE TRUNK OF A CAR. ... 6) Occasionally CO2 tanks are badly contaminated with oils, so test the system on a test object (such as a clean microscope slide) first before each new gas tank is used. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980908_OpticsCleaning/19980908.html -- 15.9 Кб -- 09.09.1998
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2707. Sloan Digital Sky Survey 2.5-meter telescope: optics
Sloan Digital Sky Survey Telescope Technical Note 19980416 . ... The common corrector . ... The Sloan Digital Sky Survey (SDSS) 2.5-meter telescope optical design is optimized for wide field (3њ), broadband (300 nm to 1060 nm) CCD imaging and multi-fiber spectroscopy. ... The second corrector element figure is in the negative of the usual form and placed closer to the focal plane. ... Grind and figure flat silica corrector for the Sloan Digital Sky Survey Telescope - Corrector Final Report", (1997). ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980416_Optics/19980416.html -- 42.5 Кб -- 08.09.1998
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2708. Stray light
... BAFFLE DESIGN . ... To avoid excessive central obstruction of the entrance pupil, a conical baffle is necessary in addition to the usual primary and secondary baffles. ... Scattered light as a function of source angle was calculated and the dominant scattering surfaces were identified. ... Part of these illuminated surfaces are visible from the focal surface as reflected by the secondary mirror. b. The primary and secondary baffles consist of stacks of annuli supported by small struts (not shown). ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980215_StrayLight/19980215.html -- 35.7 Кб -- 05.09.1998
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2709. Night Side of Venus
The GSFC acousto-optic tunable filter (AOTF) camera was used at the Apache Point Observatory 3.5 meter telescope in Sunspot, NM, to image the night side of Venus. In the near-infrared, there are several spectral regions that are relatively clear in the Venus atmosphere. ... By imaging the Venus night side, an AOTF camera can determine spatial variations of trace molecular species in the Venusian atmosphere, and even study the dynamics of the zonal winds on Venus. ... APO Home Page . ...
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Ссылки http://www.apo.nmsu.edu/Site/Venus/venus.html -- 3.8 Кб -- 26.08.1998
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2710. 3.5-m Telescope Images
... The wind baffle fits closely about the telescope. It is supported by the building and protects the telescope from the wind and stray light. With the wind baffle removed, the secondary truss and interior light baffles are visible. The interior light baffles consist of the secondary, conical and primary baffles (top to bottom). ... The conical baffle (center) blocks stray light paths that would otherwise have to be intercepted by the primary and secondary baffles. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS_Images/SDSS_Images.html -- 3.9 Кб -- 26.08.1998
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2711. Astigmatism II
... The SDSS 2.5-m primary mirror is supported in a manner similar to the Apache Point Observatory 3.5-m telescope primary. ... The axial support is provided by 48 air pistons. The pistons have the same diameter thereby applying equal forces with the same air pressure. ... Each group supports a 120њ sector of the mirror. ... Figure 1: CAD drawing showing the 2.5-m primary mirror and the locations of actuators (green circles) These actuators apply forces (10*cos2 N) to correct astigmatism. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980823_1ryAstigII/19980823.html -- 10.1 Кб -- 25.08.1998
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2712. Primary mirror support
... The axial support is provided by 78 air pistons. ... The transverse support is provided by 38 air pistons, supported by cantilevers from the mirror cell, that act on the mirror local center of gravity surface. ... The locations where the transverse mirror support forces should be applied to the mirror are listed in Table 1 and illustrated in Figure 1. ... Figure 1: CAD drawing showing the 2.5-m primary mirror and the locations of the transverse support posts (black) and axial pneumatic pistons (blue...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980713_1rySupportIII/19980713.html -- 9.9 Кб -- 25.08.1998
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2713. SDSS Paving Project
Star Paving arrived to begin the paving project on the access road to the Sloan telescope, as well as working on the 3.5m enclosure access road. They were able to survey and begin grading the 2.5m road and pad area but will return on 8/17-18 to continue and begin laying asphalt. ... A view of the improved road from the upper parking lot. A view of the road from the support building and MT stairs. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980813road/road.html -- 1.8 Кб -- 14.08.1998
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2714. SDSS Lightning Protection
We're winding down our summer-long upgrade of APO's lightning protection system. Much hard work has been done by Mark, Ron, Dave, Southwestern Electrical, and Rentschler Electric. Work was accomplished on all buildings. These pictures represent work on the down-conductors to the Ops. building and dormitories. ... The down-conductors installed by Southwestern Electrical come off the roofs and are directed into the ground. This is a close-up of how the tranfer is made into the ground. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980813litpro/litpro.html -- 2.4 Кб -- 14.08.1998
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2715. DFM/JHU Telescope
Luckily, the poor weather stayed at bay and the DFM/JHU telescope was installed in the MT dome. ... A 136' crane arrived early in the morning and the telescope plate, fork, and mount were prepared to be lifted into the MT dome. The mounting plate and forks are lifted into the dome. The DFM/JHU telescope is assembled in the dome. Back view of the telescope. More interior shots . ... Exterior shots taken by Mark Klaene/APO; interior shots taken by Gretchen Van Doren/APO. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980812dfm/dfm.html -- 1.9 Кб -- 14.08.1998
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2716. Cartridge & corrector procedures
... Exchanging spectrographic cartridges . ... The spectrographic corrector is transported between the telescope and the cat house using the cartridge cart. ... With the telescope secured, the cool observer moves the cartridge cart under the telescope and positions the used cartridge position over the instrument lift at the proper mechanical detent. ... The cool observer rolls the cartridge cart under the telescope and positions the new cartridge over the instrument lift at the proper mechanical detent....
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970730_CartridgeCorrXchg/19970730.html -- 48.9 Кб -- 14.08.1998
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2717. MT Demolition
With not much fanfare, the Monitor Telescope was disassembled and removed from the enclosure by Alan Uomoto/JH, John Briggs/UC, and APO staff Jon Brinkmann and Ron Yarger. Caption precedes pictures . ... Another shot of the support axis. John Briggs removes the axis. ... Work continues on the MT pier and enclosure preparing for modifications for new telescope. Pictures taken by Alan Uomoto/Johns Hopkins. These are limited pictures of the demolition's aftermath. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980723pier/pier.html -- 2.3 Кб -- 24.07.1998
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2718. SDSS Misc. Activities
Several site activities have occured between 7/20-24 which may be of interest. Dan Long/APO, Craig Loomis/APO, with help from Larry Fiscelli and John Anderson/FNAL, moved the plate cartridge to the telescope enclosure to provide a direct data hookup. The struggle was mighty and accomplished! Mark Klaene/APO explaing the installation of a testing apparatus to the compressed air line in the lower level. ... These pictures will remain on this site until 7/30/98 and then stored. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980722hookup/hookup.html -- 1.9 Кб -- 24.07.1998
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2719. Paint and Roller Work
Two projects are depicted here: painting the secondary supports and installing the rollers under the telescope. Caption precedes pictures . Angie Prosapio, with the help of Bill Boroski, Terry Sager, Chuck Wilson, and Steve Bastian, installed the rollers under the telescope. ... Another successful installation! Steve from CVE struggles with the breeze (and a day of rain) to paint the support structure in time for reassembly. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980610roller/roller.html -- 1.8 Кб -- 16.06.1998
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2720. Telescope/Windscreen Alignment
Bill Boroski, Terry Sager, Chuck Wilson, Angie Prosapio, and Steve Bastian worked their tails off to accomplish the alignment work needed for the next dark run. ... Terry and Chuck set lines for sighting from the windscreen, across the mirror cell. ... Bill and Angie zero out the telescope position. Chuck and Terry begin taking measurements. And more measurements.. ... Staying the extra day and putting in the extra effort made for a successful trip. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980609align/align.html -- 2.2 Кб -- 13.06.1998
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