CEDAR email: Fwd: [asapmembers] REMINDER: Thurs., July 7th 12 pm ET: ASAP Lecture/Discussion "A Preliminary Plan to Quickly Restore Utility to the Arecibo 305m Telescope"

Eliana Nossa eliana.nossa at gmail.com
Wed Jul 6 14:42:50 MDT 2022


Dear Colleagues,
Lecture/Discussion: Thurs., 7th July, 12 noon ET
Title: *A Preliminary Plan to Quickly Restore Utility to the Arecibo 305m
Telescope*
Dr. Dale Ferguson — US AFRL and Spaceforce
(A fuller biography is given below)
Host:  Dr. Eliana Nossa
Zoom Link: See below


*Abstract:*
Since the collapse of the Arecibo 305m telescope platform on Dec. 1, 2020,
there has been much discussion of building a new Arecibo telescope or
rebuilding
the facility that was destroyed. In the collapse, the tops of the three
platform support
towers were sheared off, and the feed arm fell free from the
swinging platform and
destroyed 25% of the dish. Fortunately, the Control Building, with the
computers,
spectrometers, masers, atomic clocks, 430 MHz Klystrons, etc., was spared.
By replacing the main dish support cables and resurfacing with coarse mesh,
the main dish can be repaired as a reflector for < HF operation.  By
replacing the
damaged aluminum panels to make the dish whole again, RF operations at up
to
500 MHz can be resumed. In this presentation, we outline the steps that can
be
taken to restore HF (High Frequency, 3-30 MHz) ionospheric heating, 430 MHz
ionospheric incoherent scattering radar, passive radio observations of
satellite
arcing and pulsars, and to extend the field of view to 47 degrees from the
zenith.
This would restore and improve much of the utility of the Arecibo dish.
Part of this
plan involves supporting, positioning and pointing novel point feeds from
lightweight
football-camera-like cables, strung from the rebuilt tower tops. It
is believed that
the dish may thus become broadly useful long before replacement facilities
can be
engineered and constructed.

This event is a further in the series of ASAP “lunchtime” talks/discussions
exploring
issues and proposals pertinent to Arecibo’s future.  Recordings of the
earlier talks can
be found on the areciboscience.org website.

Please reserve the date, and look for the zoom link just below.

Best regards and wishes,
ASAP Secretary



ASAP Lunch Talk – Dale Ferguson

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Dale C. Ferguson received the Ph.D. degree from The University of Arizona,
Tucson, in 1974.
He is currently the Lead for Spacecraft Charging Science and Technology
with the Space Vehicles
Division, Air Force Research Laboratory (AFRL), Kirtland Air Force Base,
Albuquerque, NM.
>From 1978 TO 1981 Dale was a pulsar staff member at Arecibo. Since 1982, he
has been
addressing spacecraft charging problems.  In 2018-2019, he spent six
months in the Arecibo
Observatory developing and deploying an instrument to measure spacecraft
charging known
as the AFRL DAGGER Project.  The broadband 327 MHz "Point Feed" was located
at the focal
surface of the Arecibo dish.



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