1 SETI Spectrometer Development for ALFALaura Spitler CASPER Workshop II 3 August 2008

2 Collaboration UC Berkeley Cornell University / NAIC Dan WerthimerAndrew Siemion CASPER group SSL SETI group Cornell University / NAIC Laura Spitler Jim Cordes

3 Arecibo Observatory

4 ALFA receiver system 1.4 GHz 7 feeds 300 MHz BW Surveys PALFA ALFALPHA

5 SETI ALFA Survey Bandwidth: 200 MHz (300 MHz)Number of channels: 128 Mchannels  ~ 1.5 Hz Data rate: ~1 Mbyte/sec (more later?)

6 SETI spectrometer

7 SETI spectrometer hardwareFirst generation iADC + iBOB + BEE2 Multiplex beams and polarization Second generation 7 ROACH boards

8 ADC + DDC + XAUI (iBOB)

9 4k PFB (BEE2)

10 Corner Turner & FFT (BEE2)32k x 4k matrix transpose FFT 32k

11 Thresholder and Data RecorderRecord events to Shared FIFO accessible via BORPH Read out as UDP packets via 10 Mb Ethernet Transfer data to Cornell / Berkeley via internet

12 SERENDIP pipeline Cleans raw data Prepares for database RFI extractionCandidate generation

13 Post processing