{"id":122,"date":"2016-11-12T15:53:56","date_gmt":"2016-11-12T14:53:56","guid":{"rendered":"https:\/\/escience.aip.de\/robo\/?page_id=122"},"modified":"2019-12-06T09:57:15","modified_gmt":"2019-12-06T08:57:15","slug":"spectrograph","status":"publish","type":"page","link":"https:\/\/pepsi.aip.de\/?page_id=122","title":{"rendered":"Spectrograph"},"content":{"rendered":"

The spectrograph is located on a 2m x 6m optical table in the telescope pier, inside a pressure- and temperature-stabilized chamber. It receives light from the polarimeters and permanent focus stations via 44m long fibres, coupled with image slicers. The polarimetric mode provides a resolution of 130.000, while resolutions of 50.000, 130.000 and 250.000 can be obtained with the permanent focus stations through a choice of different fibres. A white-pupil two-arm design with a 200mm main beam diameter, utilizing the largest available monolithic echelle grating and VPH grisms for cross dispersion, is employed. The collimators are nominally off-axis Maksutov systems, allowing for a beam diameter reduction to 125mm in the blue and red transfer collimator arms. The two spectrograph cameras are equipped with a single monolithic 10k x 10k CCD from STA (STA 1600LN). For each spectral order, four spectra are recorded, i.e. two polarization states or object\/sky for each telescope. The entire spectral range from 383 to 912 nm can be covered in three exposures.<\/p>\n

Overall spectrograph characteristics<\/h2>\n\n\n\n\n\t\n\n\t\n\t\n\t
Fibre Diam. (\u03bcm)<\/th>Sky Diam. (arcsec) <\/th># of slices (n)<\/th>Slicer Width (\u03bcm)<\/th>Slicer Width (arcsec)<\/th>R = \u03bb\/\u0394\u03bb<\/th>R Sampl. (pix)<\/th>\n<\/tr>\n<\/thead>\n
100<\/td>0.74<\/td>7<\/td>70<\/td>0.11<\/td>250,000<\/td>2.0<\/td>\n<\/tr>\n
200<\/td>1.5<\/td>5<\/td>175<\/td>0.30<\/td>130,000<\/td>4.2<\/td>\n<\/tr>\n
300<\/td>2.3<\/td>3<\/td>500<\/td>0.77<\/td>50,000<\/td>12.1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n
\"Spectrograph<\/a>
Spectrograph optical design.<\/figcaption><\/figure>\n

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The spectrograph is located on a 2m x 6m optical table in the telescope pier, inside a pressure- and temperature-stabilized chamber. It receives light from the polarimeters and permanent focus stations via 44m long fibres, coupled with image slicers. The polarimetric mode provides a resolution of 130.000, while resolutions of 50.000, 130.000 and 250.000 can … Continue reading Spectrograph<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-122","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/122","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=122"}],"version-history":[{"count":14,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/122\/revisions"}],"predecessor-version":[{"id":1377,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/122\/revisions\/1377"}],"wp:attachment":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}