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SCUBA-2: Data Acquisition

SCUBA-2: Data Acquisition. Dennis Kelly (UKATC). Data Acquisition Summary. The frames are transferred from the FPGAs to the 8 RTLinux data acquisition computers. The data acquisition computers perform the DREAM least-squares solution or the SCANMAP sky baseline determination as necessary.

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SCUBA-2: Data Acquisition

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  1. SCUBA-2:Data Acquisition Dennis Kelly (UKATC)

  2. Data Acquisition Summary • The frames are transferred from the FPGAs to the 8 RTLinux data acquisition computers. • The data acquisition computers perform the DREAM least-squares solution or the SCANMAP sky baseline determination as necessary. • The raw and processed data are stored to local disk along with full header information. • The raw and processed data are collected from the 8 data acquisition computers and served both to the Quick-Look system and the data reduction pipeline. • The raw and processed data are stored (maximum 300Gbyte per night).

  3. FPGAs RTS Client Data capture commands Data capture replies data frames FPGA setup FPGA commands do I/O to FPGAs accept commands data available acquired frames data ready recalled frames process and store Local Disk storage shared memory data store raw and processed frames data for export exported data export data Data Pipeline RTLinux System

  4. OCS RT Linux systems (8) RTS client Gather subarray data FPGA systems (8) Generate Quick-Look Reduce Data EPICS Display Quick-Look Export Data JCMT Log Data Output Flow

  5. get SCANMAP data get DREAM data RTLinux acquisition machines per-bolometer sky baseline fit Solve least-squares problems subarray collating machine gather scanmap gather DREAM subtract sky baselines & apply prelim flux remove sky plane & apply prelim flux Quick-Look machine combine to (RA,Dec) map and display combine to (RA,Dec) map and display apply calibrations apply calibrations Pipeline machine combine to (RA,Dec) map combine to (RA,Dec) map Data Processing

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