Detector Controller User Requirements
Contents
1. Nordic Optical Telescope Detector Controller User Requirements Thomas Augusteijn Graham Cox NOT Observatory Detector Controller User Requirements November 2007 1 1 Introduction This document describes the user requirements for a new detector controller to be used at the Nordic Optical Telescope NOT The requirements are specifically defined based on the current suit of detectors in use at the NOT but this is also expected to cover the requirements for possible future detectors The requirements are split in two part In the first part we define the general requirements for the detector control system while in the second part we detail specific requirements Beyond these basic requirements we also define some capabilities which are not essential but we consider desirable 2 NOT Observatory Detector Controller User Requirements November 2007 2 General requirements Here we define the general requirements for the detector control system They mostly refer to necessary properties of the system 1 Detectors The controller should be capable to control both CCDs and IR arrays Specifically it is should be able to control E2V CCD42 40 2k x 2k 2x2 mosaic of 4 Loral Lesser 2k x 2k Hawaii 1 1k x 1k SITe TK1024A 1k x 1k desirable E2V L3CCD desirable 2 Read out modes The following read out modes are required to be available Shuttered exposure Single window Same size multi window desirable External GPS s2. oned as for e Read out speed e Read out noise e Non linearity e Charge transfer efficiency 2 Read out performance The baseline requirements for the read out of the detectors are the following e Hawaii 1 array 1k x 1k Full frame read out in 1 sec 4 psec pixel channel with 10e7 read out noise e E2V CCD42 40 or Loral Lesser 2k x 2k Full frame single channel read out in 25 sec 6 pusec pixel channel with 3 5e7 read out noise e Cross talk between channels lt 10000 1 3 Detector parameters The following parameters for the detectors are required to be se lectable in software Bias voltages Gain at least 2 settings only for CCDs Binning at least 1 2 and 3 in either axis only for CCDs Ability to implement an artificial over scan only for CCDs Fast read out mode Full frame single channel read out in lt 10 sec with corresponding increase in read out noise only for CCDs desirable e Detector temperature desirable
3. ynchronisation of exposures desirable Reset read read Hawaii 1 array Ramp sampling Hawaii 1 array 3 Image acquisition software With the controller an image acquisition software program should be provided that can acquire images from both CCD and IR detector systems It should e Run on a Linux platform and be configurable e Provide the images in standard FITS format e Be capable of scientific image acquisition similar capabilities as the present BIAS versions are highly desirable 4 Environment The controller will be mounted on the instrument attached to the telescope in a dome and it should be able to operate e At temperatures in the range 10 30 C and humidity up to 90 5 Operation and maintenance To be able to operate and maintain the controllers after delivery we require e Documentation including a User manual Maintenance manual Technical manual e Customer support for troubleshooting software upgrades spare parts and supply of ad ditional units for a number of years NOT Observatory Detector Controller User Requirements November 2007 3 3 Specific requirements Here we define the specific requirements for the detector control system They mostly refer to necessary capabilities of the system 1 Detector limited performance The controller and its connection to the data acquisition computer should not significantly affect the manufactures specification for the detectors men ti
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