Array controller system with cryogenic pre-amplifiers for MIMIZUKU
Array controller system with cryogenic pre-amplifiers for MIMIZUKU
复制标题
MIMIZUKU 带有低温前置放大器的阵列控制器系统
DOI：
10.1117/12.2232532
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
K. et al.
中科院分区：
文献类型：
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作者：
Okada;K. et al.
MIMIZUKU是一个中红外成像仪和摄谱仪正在开发的东京大学阿塔卡马天文台（TAO）6.5米望远镜（PI：Y。Yoshii）。为了充分利用Chajnantor站点的高大气传输，MIMIZUKU覆盖了从2到38 μm的宽波长范围，具有三个阵列探测器：由Teledyne制造的具有5 μm截止的夏威夷-1 RG HgCdTe 1024 × 1024阵列，由Raytheon制造的Aquarius Si：As IBC 1024 × 1024阵列，以及由DRS制造的MF-128 Si：Sb BIB 128 × 128阵列。我们新开发了一个阵列控制器系统来操作这些多个阵列。在用MIMIZUKU进行宽带成像观测时，由于高的热背景通量，需要高于0.5 MHz的采样率，以防止其威尔斯饱和。这种高速信号在通过从阵列到读出电路的线路时变钝。为了克服这个问题，我们已经开发了高速低温缓冲前置放大器电路与商业GaAs MESFETs，而不是硅JFET，这是通常用于缓冲放大器在低温温度。低温缓冲电路安装在20 K的MIMIZUKU光具座的外壁上。我们已经测量了阵列控制器系统的读出噪声，包括测试低温恒温器和室温电路中的低温缓冲器，并确认系统的输入参考噪声低于Aquarius阵列读出噪声的规格值。
MIMIZUKU is a mid-infrared imager and spectrograph being developed for the University of Tokyo Atacama Observatory (TAO) 6.5-m telescope (PI: Y. Yoshii). To fully utilize a high atmospheric transmission of the Chajnantor site, MIMIZUKU covers a wide wavelength range from 2 to 38 μm with three array detectors: a HAWAII-1RG HgCdTe 1024 × 1024 array with a 5 μm cutoff manufactured by Teledyne, an Aquarius Si:As IBC 1024 × 1024 array by Raytheon, and a MF-128 Si:Sb BIB 128 × 128 array by DRS. We have newly developed an array controller system to operate these multiple arrays. A sampling rate higher than 0.5 MHz is required to prevent from saturation of their wells in broad-band imaging observations with MIMIZUKU due to high thermal background flux. Such high speed signals are dulled when passing through lines from the arrays to readout circuits. To overcome this problem, we have developed high-speed cryogenic buffer pre-amplifier circuits with commercial GaAs MESFETs, instead of Si JFETs, which are generally used in buffer amplifiers at cryogenic temperatures. The cryogenic buffer circuits are installed on an outer wall of the optical bench of MIMIZUKU at 20 K. We have measured readout noises of the array controller system including the cryogenic buffers in a test cryostat and room temperature circuits and confirmed that input referred noises of the system are lower than the specification value of the readout noise of the Aquarius array.