CXT is located within the High Energy Astrophysics Division of the
CfA, with laboratories at Cambridge Discovery Park. The CXT goals are
to provide a focus for the efforts of individual scientists working on
optics, sensors, or future facility or mission concepts, primarily
(but not exclusively) related to X-ray astronomy. The CXT will
provide critical strategic leadership in new optics and detectors for
the nation?s space astrophysics program.
The CXT enlists participation from the staff scientists at CfA -
federal and trust. Using SAO IR&D/REF funding for equipment,
materials, and limited engineering support, several projects have been
started - these include Active Pixel Sensors (a follow up to X-ray
CCDs), Active X-ray Optics (examining how to modify an X-ray optic in
a controlled manner), High Energy Reflectivity (how to improve X-ray
reflectivity above about 10 keV, to make hard X-ray optics), Magnetic
MicroCalorimeter X-ray Absorber (how to make arrays of Bi absorbers to
be used with mag-cal readouts), Slumped X-ray Optics (how to make
light weight optics by slumping thin glass on a figured mandrel), and
High Speed Optical Imaging Detectors (how to monitor 1000?s of stars
for occulations by small bodies).
Potential applications include instruments for new missions that span
all time frames. For example Active Pixel Sensors could be used for
Con-X's grating readout, or in the focal plane of a possible X-ray
Cluster Survey Mission in support of dark energy studies. The Active
Optics are targeted to more distant missions such as Generation-X
which is a NASA VIsion Mission slated for the 2025 and beyond time
frame. High speed optical detectors could be use to carry out a census
of the objects in the Kuiper Belt and Oort cloud.
In the CXT, long term goals are identified, for example the need
for a higher angular resolution, larger area successor to Chandra. To
address this goal, several technologies are selected that work on
different scales of approximation to making an ideal optic. Slumping
may achieve a 5 arc second figure, selective deposition could improve
this performance to 1 arc second, and finally active control could
tune mirrors to the desired 0.1 arc second level. Each technology has
an identified PI responsible for the work. The CXT provides some
common infrastructure - lab space (currently the HRC lab), tools,
equipment (e.g., our optical interferometer metrology station), and
management oversight. For each technology, the first goal is to
understand the basic physical processes governing performance rather
than trying to meet a specific specification. This approach emphasizes
a strategic approach to technology rather than a more immediate
tactical approach. Initial studies are designed to see what can be
accomplished and find out where the technology is heading.
CXT should ultimately reach a size of 15 FTEs consisting of a mix of
staff scientists, postdocs, graduate and undergraduate students,
engineers and technicians. Funds for equipment, supplies and
materials, etc. are also needed, leading to an overall operating
budget of about $2.5M/year. To obtain this funding, the CXT "business
plan" is to have a mix of core funding in the SI Federal base, contract
and grant funding from NASA, NSF, DOE etc., and private funds through
endowments, foundations and gifts.
For further information please contact CXT Director Dr. Stephen Murray
|