{"id":311,"date":"2017-02-21T16:48:35","date_gmt":"2017-02-21T15:48:35","guid":{"rendered":"https:\/\/bmk10k.aip.de\/?page_id=311"},"modified":"2018-03-13T12:35:49","modified_gmt":"2018-03-13T11:35:49","slug":"the-10k-ccd-system","status":"publish","type":"page","link":"https:\/\/bmk10k.aip.de\/?page_id=311","title":{"rendered":"The 10k CCD System"},"content":{"rendered":"

\"\"The CCD system foreseen for the BMK is the PEPSI<\/a> RED spare 10k\u00d710k device. The detector is\u00a0a monolithic STA1600LN device from STA<\/a>. It is a\u00a0thinned, backside illuminated 10560\u00d710560-pixel solid-state CCD with a transparent\u00a0poly-crystalline silicon gate structure for creating electron hole pairs. Its full frame is organized in\u00a0two halves each containing an array of 10560 horizontal by 5280 vertical photosites. Horizontal\u00a0transport registers along the top and bottom permit simultaneous readout of both halves. The\u00a0pixel spacing is 9 \u03bc \u00d7 9 \u03bc .<\/p>\n

For dark reference, each readout line is preceded by 8 dark pixels. This\u00a0architecture provides video information as a single sequential readout of 5280 lines containing\u00a01330 photosites. One output amplifier is located at the end of each horizontal register, thus, the\u00a0device has in total 16 amplifiers. They are dual FET floating diffusion amplifiers with a reset\u00a0MOSFET tied to the input gate. It was backside processed and characterized at ITL (Lesser 2012,\u00a0SPIE 8453).<\/p>\n

The device has been fully characterized (protocol serial number SN18043). Its flat field\u00a0uniformity is good in the red where the AR coating has been optimized. However, uniformity is\u00a0not very good below 500 nm due to features on the surface which appeared during backside\u00a0etching. There are a significant number of bad columns (faintly bright or dark) in the device\u00a0making it of lower grade than the PEPSI RED and BLUE CCDs.<\/p>\n

The electrical performance is\u00a0about the same as for the other devices. All 16 channels are operable. CTE appears excellent\u00a0from cosmic ray analysis. Dark current is \u2248 2 e\u2212 per pixel per hour at the operating temperature of\u00a0-90\u00b0C during testing. The median total system noise is about 4.5 e\u2212 rms (range 3.7\u20134.9 e\u2212) with\u00a0gain settings ranging between 0.48\u20130.60 e\u2212\/DN at 135 kHz read out. No significant glows are\u00a0seen when the OD voltages are turned off during integration. Full well is approximately at 65,000\u00a0e\u2212. Peak QE of 94% is reached at 670 nm and remains above 90% for 600\u2013750 nm but drops to\u00a085% at 550 nm and to 46% at 907 nm. Read-out time is 35s in the current DSP setting, frame\u00a0transfer time is 9s, and CCD cleaning time is 4s. With 2s overhead, the full cycle time is 50s.<\/p>\n

The large CCD size requires a special dewar. It was designed and manufactured at AIP.\u00a0A diode protection circuit was designed and fabricated at ITL<\/a> and installed in the dewar to reduce\u00a0the possibility of damage from voltage spikes. The dewar has four vacuum connectors. Two of\u00a0them are carrying the video signals (8 channels each). The third is connected to the clock signals\u00a0and the fourth is for the temperature control. Therefore, the dewar requires a three-cable\u00a0connection to the CCD controller (ARC-48C with two eight-port video-channel cards\u00a0and one cable connection to the temperature controller (CryoCon Model 24C, from Cryogenic\u00a0Control Systems<\/a>, Inc.).<\/p>\n

The CCD is run through software called AzCam. AzCam is a CCD image acquisition and\u00a0analysis system developed at ITL. The system consists of three main components:<\/p>\n

    \n
  1. the main\u00a0server named AzCamServer,<\/li>\n
  2. a camera server which interacts with the controller hardware\u00a0named ControllerServer, and<\/li>\n
  3. various client applications such as AzCamTool and\u00a0AzCamConsole.<\/li>\n<\/ol>\n

    AzCamServer is the core program which coordinates all AzCam activities. It\u00a0communicates over internet sockets with control clients, hardware servers, logging processes,\u00a0etc. AzCamServer processes commands and interacts with the various software components as\u00a0necessary, receiving image data, creating FITS image files, and sending image files to remote\u00a0data processes. AzCamServer is written in Python with C++ components. ControllerServer\u00a0communicates with AzCamServer over a socket and directly commands the controller hardware\u00a0(a PCI-Express card) via drivers. ControllerServer is written entirely in C++. For local testing\u00a0and debugging the user GUI is AzCamTool, which is a LabVIEW application. This client allows\u00a0users to select image file names, binning, DSP code, and many other parameters.<\/p>\n","protected":false},"excerpt":{"rendered":"

    The CCD system foreseen for the BMK is the PEPSI RED spare 10k\u00d710k device. The detector is\u00a0a monolithic STA1600LN device from STA. It is a\u00a0thinned, backside illuminated 10560\u00d710560-pixel solid-state CCD with a transparent\u00a0poly-crystalline silicon gate structure for creating electron hole pairs. Its full frame is organized in\u00a0two halves each containing an array of 10560 horizontal … Continue reading The 10k CCD System<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"parent":116,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-311","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/311","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=311"}],"version-history":[{"count":4,"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/311\/revisions"}],"predecessor-version":[{"id":435,"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/311\/revisions\/435"}],"up":[{"embeddable":true,"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=\/wp\/v2\/pages\/116"}],"wp:attachment":[{"href":"https:\/\/bmk10k.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}