##### Above: Comparison plot demonstrating the shorter integration times.

The EVN MkIV Data Processor at JIVE has achieved quarter-second integrations using the whole correlator. The previous limit was 1s. The equivalent output (user) data rate is 3000 kB/s. These shorter integration times will reduce time-smearing for wide-field applications. This improvement is the first step along the way to the Post-Correlator Integrator (which aims to provide integration times for the whole correlator down to 1/64 s) and recirculation (which would increase spectral resolution attainable per IF/polarization).

Note that this present reduction in integration times does not affect the spectral resolution of the correlator; but the same configurations that previously worked with 1s would now work with 0.25s. Some examples of configurations that use the whole correlator include:

#sta | #if | #pol | #frq points (per IF/pol) |
---|---|---|---|

4 | 1 | 4 | 2048 |

8 | 1 | 1 | 2048 |

8 | 2 | 1 | 1024 |

16 | 8 | 4 | 16 |

Proposals for experiments that require integration times down to 0.25s are now welcome. For **current** information about system limits on the EVN Data Processor follow the links on the JIVE home page or contact Bob Campbell at the Science Operations & Support Group.