PuMa-II: A Wide Band Pulsar Machine for the Westerbork Synthesis Radio Telescope
PuMa-II: A Wide Band Pulsar Machine for the Westerbork Synthesis Radio Telescope
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PuMa-II：用于 Westerbork 合成射电望远镜的宽带脉冲星机器
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
W. van Straten
中科院分区：
文献类型：
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作者：
R. Karuppusamy;B. Stappers;W. van Straten
脉冲星机器II(PUMA-II)是韦斯特堡综合射电望远镜(WSRT)的新的灵活脉冲星处理后端系统，专门设计来利用升级后的WSRT。该仪器基于运行Linux操作系统的计算机集群，具有最少的定制硬件。最大160 MHz模拟带宽采样为8×20 MHz子带，分辨率为8位，可记录在连接到独立计算机节点的磁盘上。数据的处理是在另外的32个节点中完成的，从而允许在WSRT观测到的大多数脉冲星的近乎实时的相干消散。这使脉冲星观测的带宽总体上翻了一番，并使相干消色散的使用带宽比WSRT以前可能的带宽大了8倍。彪马-II是目前使用的带宽最宽的相干消色散机之一，最大时间分辨率为50 ns。该系统现在经常用于高精度脉冲星计时研究、偏振研究、单脉冲工作和各种其他观测工作。
The Pulsar Machine II (PuMa-II) is the new flexible pulsar processing back-end system at the Westerbork Synthesis Radio Telescope (WSRT), specifically designed to take advantage of the upgraded WSRT. The instrument is based on a computer cluster running the Linux operating system, with minimal custom hardware. A maximum of 160 MHz analog bandwidth sampled as 8 × 20 MHz subbands with 8-bit resolution can be recorded on disks attached to separate computer nodes. Processing of the data is done in the additional 32 nodes allowing near real time coherent dedispersion for most pulsars observed at the WSRT. This has doubled the bandwidth for pulsar observations in general, and has enabled the use of coherent dedispersion over a bandwidth 8 times larger than was previously possible at the WSRT. PuMa-II is one of the widest bandwidth coherent dedispersion machines currently in use and has a maximum time resolution of 50 ns. The system is now routinely used for high-precision pulsar timing studies, polarization studies, single pulse work, and a variety of other observational work.