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Topic Name: Protect the detector electronics of the proposed ILC
Category: Electronics
Research persons: Gary Bower and Nick Sinev
Location: Stanford Linear Accelerator Center, Menlo Park, CA, United States
Details
By placing electronics from the retired SLAC Large Detector (SLD) next to a
test beam in End Station A, a small group of experimenters is learning how to
protect the detector electronics of the proposed International Linear Collider (ILC).
Electromagnetic interference is a real concern for the ILC, where very short
particle bunches will emit electromagnetic radiation as they travel through beam
pipes toward the center of the detector.
In the world's first linear collider—the SLC—the detector electronics close
to the beam pipe failed, probably due to electromagnetic interference.
Physicists worked around the problem by instructing the electronics to wait to
read out until after each bunch of particles had passed by. At the ILC, however,
the time between particle collisions will be vastly shorter, once every 300
nanoseconds, rather than every eight million nanoseconds. The ILC electronics
must read out constantly.
Researchers Gary Bower and Nick Sinev are using the test beam to test the
effectiveness of shielding, which can be as simple as aluminum foil wrapped
around the beam pipe. For three weeks this month, the test beam mimics the ILC
beam in bunch length and charge, allowing multiple R&D groups from around the
world to develop ways to monitor, characterize, and improve the ILC beam.
The beam pipes have holes through them that contain beam position monitors
and other instruments to measure beam characteristics just before a collision.
Each short bunch of particles generates an electric field that can escape
through these gaps in the beam pipe and generate short, intense radio waves and
microwaves. The researchers have reproduced the failure of the SLD electronics,
used antennas to measure the amount of electromagnetic interference, and
determined that the signals propagate through the air and wash over the
electronics.
If researchers can isolate which particular frequency of waves causes
interference, it may help with electronics design. Even if the problem can't be
isolated, results from earlier test beam runs show that shielding is a possible
solution
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