ALMA Memo 563 Suggestions for SMA Connector Use on ALMA

ALMA Memo #303 Water Vapour Radiometers for ALMA

The JCMT-CSO single-baseline interferometer was the first to demonstrate phase correction using the 183 GHz line, using equipment built by Martina Wiedner, Richard Hills and colleagues. Only a limited quantity of data were gathered but the results (ALMA memo 252) were encouraging and suggested that even an uncooled system could provide effective phase calibration at submillimetre wavelengths. S...

ALMA Memo #588 Inference of Coefficients for Use in Phase Correction II: Using the Observed Correlation Between Phase and Sky Brightness Fluctuations

By observing bright and compact astronomical sources while also taking data with the 183 GHz Water Vapour Radiometers, ALMA will be able to measure the ‘empirical’ relationship between fluctuations in the phase of the astronomical signal and the fluctuations of sky brightness around 183 GHz. Simulations of such measurements assuming only thermal noise in the astronomical and WVR receivers are p...

ALMA Memo No. 324 Proposal for ALMA Front End Optics

Mma Memo No. 265 Cost-beneet Analysis of Alma Conngurations

A cost-beneet analysis for ALMA conngurations is conducted based on the previous analysis of the MMA conngurations by Holdaway (1998). In particular, the impacts of having a larger number of antennas and longer baselines on the overall array eeciency are addressed along with several practical concerns that may aaect the connguration plan.

ALMA Memo No. 335 Phase Drift Measurements of YIG-Tuned Oscillator Sources for the ALMA LO

In this memo, we present measured phase drift data of a YIG-tuned oscillator (YTO) multiplied to mmwave frequencies, a prototype of the baseline ALMA LO source. The test setup and analysis algorithms are described. We also discuss phase drift added by mmwave multipliers and power amplifiers, with the conclusion that their contribution is insignificant. Various components and system concepts are...