HESR2

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HESR2 Electron Cooling (EC) Dag
Reistad Uppsala University
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High Energy
Ensure feasibility of 8 MV cooler prototyping of
critical components
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The Budker Institute in Novosibirsk (BINP) has
performed a study. They propose a 30 m long
electron-cooling section with a 0.5 T
longitudinal magnetic field with straightness
10-5 radians (rms). They propose to produce the
high voltage (up to 8 MV) with an H- cyclotron,
which charges the high-voltage terminal.
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We are looking at alternatives, especially to use
more conventional means to achieve the high
voltage van de Graaff accelerators (Pelletrons)
as in Fermilab
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or (cascade generators (Dynamitrons)
manufactured by HVEE in Amersfoort, the
Netherlands, and IBA-RDI on Long Island, N.Y.
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First step needs to be to define fundamental
parameters of electron-cooling system, including
its maximum energy. It is under investigation,
whether stochastic cooling would do the job at
the high energies in HESR (gt 8 GeV, corresponding
to 4.5 MeV electrons)
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we want to build an electron-beam test station,
using parts from the CELSIUS electron cooler.
This will be used for testing of electron-beam
diagnostics and also electron gun and electron
collector.
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We (Uppsala University) are supposed to
contribute 233 person-months to HESR2 (HESR-EC)
and 42 person-months to HESR4 (HESR-BD). The
exact borderline between these is difficult to
draw, and we have chosen to regard them together.
Thus, we have to deliver 275 person-months to
HESR(24). This work will be performed by
Torsten Bergmark, Carl-Johan Fridén, Björn
Gålnander, Tomas Johnson, Tor Lofnes, Gunnar
Norman, Dag Reistad, Roger Ruber, Volker
Ziemann and temporary technicians and designers.
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