20
Electron Cloud Diagnostic for
Quadrupole Magnets—TechSource, Inc.,
Dr. Robert J. Macek,
Dr.
DOE Grant No. DE-FG02-04ER84105
Amount: $650,000
Electron cloud effects, including
electron cloud induced instabilities, are a critical technical risk for the
next generation of high intensity, accelerator-based research facilities. In particular, new diagnostics are required
to observe electron cloud formation and trapping in quadrupole magnets, in
order to test theories and simulations of cloud buildup and beam dynamics
effects induced by electron clouds. To
date, no diagnostics have been developed that can measure the electrons trapped
in accelerator quadrupole magnets. This
project will develop a diagnostic instrument that can measure electron cloud
formation and trapping in quadrupole magnets used in high intensity rings or
beam transport. In Phase I, extensive
simulations of electron cloud formation and trapping in were made to determine
the expected characteristics (including trapping) of the electron cloud in
quadrupole magnets. The simulations
revealed the unexpected result that numerous electrons were ejected from the
quadrupole when the long bunch beam pulse was present. Based on these simulations, an optimized
physics design for a diagnostic was developed.
Phase II will involve the design, fabrication, and installation of a
prototype diagnostic assembly. Tests of
the prototype will evaluate the effectiveness of the diagnostic, and data on
the electron cloud formation and trapping in quadrupoles will be collected.
Commercial
Applications and Other Benefits as described by the awardee: The results of
this project should benefit the high intensity proton and positron rings now being
upgraded, under construction, or under active consideration at such facilities
as the Spallation Neutron Source, the International Linear Collider, the
Relativistic Heavy Ion Collider,