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NAIC/AO Newsletter No. 19

NAIC Instrumentation Categories


Paul Goldsmith


The National Astronomy and Ionosphere Center and the Arecibo Observatory have a long history of encouraging users to develop and refine equipment to carry out the wide variety of scientific projects that take place at the Observatory. Over the years a unique synthesis has developed between the extraordinary sensitivity provided by the Arecibo telescope and the ingenious and effective signal processing equipment developed by the users. In addition, NAIC has developed facility instrumentation that is available to users. Facility instruments tend to fulfill a broad range of scientific needs and have been used to extremely good effect by scientists who do not need, or who are not in a position, to develop their own instrumentation.

The following paragraphs summarize the three different categories of NAIC instrumentation that we expect to see at the Observatory in the years ahead. Most of the effort in the area of user-owned equipment and user-owned-public-access equipment has been in the area of pulsar research, but this need not be entirely the case. For example, there may be people who wish to bring acousto-optic spectrometers for different broad-band spectroscopic projects. In any case, we will be working to develop a suite of facility instruments with which we will try to satisfy the needs of as many users as possible in the areas of spectroscopy, continuum measurements and polarimetry, and also pulsar astronomy. We have already developed a new generation of instruments for atmospheric science around the 430-MHz radar. A system tailored to the S-band solar system radar is currently nearing completion. A powerful 32,768-channel spectral line correlator with four separately tunable inputs per polarization should be available by firs

Instrumentation Categories


Facility Equipment


NAIC is committed to providing facility equipment that meets the needs of as many users as possible. The Observatory is open to suggestions on specifications as well as improvements to widely used facility instrumentation. User-oriented documentation will be provided on-line in HTML form. Technical documentation will be available as well.

User-Owned Equipment


In addition to the facility equipment provided by NAIC, many observers bring their own special-purpose equipment that they use for specific projects. Such equipment is referred to as user-owned equipment. NAIC encourages such initiatives by providing space, power, and access to the IF signal. In addition, the equipment can be locked to the Observatory time and frequency standards, and linked to the Internet. Following the completion of the upgrade project, telescope position and other monitor data will be available. Advance arrangement should be made with the Arecibo Observatory Director (Daniel Altschuler, daniel@naic.edu) to guarantee a smooth installation.

User-Owned-Public-Access Equipment


If you are willing to permit unrestricted access to your equipment, converting it to public access status, this can be of significant benefit to all parties. Such equipment is called user-owned-public-access equipment. The Observatory may take over routine maintenance, and assist in providing both technical and user-oriented documentation. Such arrangements are handled on a case-by-case basis. The technical specifications will be circulated via the Newsletter and other means, and the equipment becomes available to all who wish to use it. No co-authorship or other obligations are incurred, though professional courtesy warrants acknowledgment in publications resulting from use of the equipment. Arrangements of this sort are normally set up for a minimum of three years, renewable by mutual consent. In other instances, temporary availability of unique equipment may merit special arrangements. Contact the NAIC Director (Paul Goldsmith, goldsmit@astrosun.tn.cornell.edu) for further information.

I am happy to inform you that the Pennsylvania State Pulsar Machine (PSPM) developed by Alex Wolszczan and collaborators has been the first instrument to enter the "user-owned-public-access" category. Also, the Princeton Mk III Timing Machine and Clock Calibrators have been added to this category just as this article goes to press--let's hear it for the Tigers!

Progress has recently been reported by Don Backer on the construction of the Arecibo-Berkeley Pulsar Processor (see http://astro.berkeley.edu/~mpulsar/bpp/bpp.htm). His current plan is to commission this processor by fall here at AO and it will become generally available afterwards. I hope and expect that several other existing and soon-to-be-completed systems will follow. This should be beneficial to all concerned.

It is also appropriate to mention some other instrumentation that have recently arrived at Arecibo thanks to support from a number of other institutions. We have received from JPL a hydrogen maser on long-term loan, which should significantly improve our ability to participate in VLBI experiments (see next article). We are negotiating for a loan of a tape recorder system also to be used for this purpose. Furthermore, we have received components for several key receivers from JPL, ex-SETI program, that have greatly assisted our instrumentation efforts. NRAO has been very helpful in this regard as well. Overall, it is really impressive to me how much support NAIC has received from a wide variety of users and other institutions--and I want to emphasize that in the present financially constricted times this makes a real difference.

In the post-upgrade era, NAIC very much wishes to continue making Arecibo a telescope for which users can develop custom instrumentation. We also feel it is very important that we allow the widest possible variety of users to carry out their scientific projects at Arecibo. A result of this is the necessity to balance facility equipment with that supplied by users. Both for success in science and for training graduate students, we want to make Arecibo available to anyone whose proposals get approved for time on the telescope, but also want to encourage the development of specialized instrumentation.

Paul Goldsmith
Instrumentation Categories
Facility Equipment
User-Owned Equipment
User-Owned-Public-Access Equipment


NAIC/AO Newsletter No. 19 - 1 JUL 1996

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