We propose the Allan Variance method to identify spurious signals with sensitive detectability. With this method, detection level of -56 dB with respect to the system noise can be achieved within the integration time less than 10 min. Detected spurious signals can be mitigated by masking these channels before spectral bunching to required spectral resolution. We will present the principle of the method and the performance taken through the ALMA system verification activity. This method can be applied for universal single-dish spectroscopy.
The Atacama Large Millimeter/submillimeter Array (ALMA) Band 10 receiver covering 787 to 950 GHz is the highest frequency receiver of the ten bands envisioned for the ALMA Front End system. The Band 10 receivers have been undergoing installation and commissioning since 2012. After the Band 10 receiver tuning scripts (Josephson currents suppression, LO power optimization) and operation procedures had been developed and implemented, astronomical verification procedures (radio pointing, focus, beam squint, and end-to-end spectroscopic verification) were established in single dish mode at the ALMA Operations Support Facility (OSF; 2900 m elevation). Subsequently, the first Band 10 astronomical fringes were achieved at the Array Operations Site in October 2013 (AOS; 5000 m elevation). This is the highest frequency ever achieved by a radio interferometer and opens up a new window into submillimeter astrophysics.
The Atacama Large Millimeter/submillimeter Array (ALMA) will consist of at least 54 twelve-meter antennas and 12
seven-meter antennas operating as an aperture synthesis array in the (sub)millimeter wavelength range. The ALMA
System Integration Science Team (SIST) is a group of scientists and data analysts whose primary task is to verify and
characterize the astronomical performance of array elements as single dish and interferometric systems. The full set of
tasks is required for the initial construction phase verification of every array element, and these can be divided roughly
into fundamental antenna performance tests (verification of antenna surface accuracy, basic tracking, switching, and on-the-fly rastering) and astronomical radio verification tasks (radio pointing, focus, basic interferometry, and end-to-end
spectroscopic verification). These activities occur both at the Operations Support Facility (just below 3000 m elevation)
and at the Array Operations Site at 5000 m.
The Verification Model (VM) of MIRI has recently completed an extensive programme of cryogenic testing, with the
Flight Model (FM) now being assembled and made ready to begin performance testing in the next few months. By
combining those VM test results which relate to MIRI's scientific performance with measurements made on FM
components and sub-assemblies, we have been able to refine and develop the existing model of the instrument's
throughput and sensitivity.
We present the main components of the model, its correlation with the existing test results and its predictions for
MIRI's performance on orbit.
The Mid-Infrared Instrument (MIRI) is one of the three scientific instruments to fly on the James Webb Space
Telescope (JWST), which is due for launch in 2013. MIRI contains two sub-instruments, an imager, which has low
resolution spectroscopy and coronagraphic capabilities in addition to imaging, and a medium resolution IFU
spectrometer. A verification model of MIRI was assembled in 2007 and a cold test campaign was conducted between
November 2007 and February 2008. This model was the first scientifically representative model, allowing a first
assessment to be made of the performance. This paper describes the test facility and testing done. It also reports on the
first results from this test campaign.