Multipactor in Accelerating Cavities: Particle Acceleration and Detection
Autor Valery D. Shemelin, Sergey A. Belomestnykhen Limba Engleză Paperback – 2 sep 2021
This
book
is
written
by
two
world-recognized
experts
in
radio
frequency
(RF)
systems
for
particle
accelerators
and
is
based
on
many
years
of
experience
in
dealing
with
the
multipactor
phenomenon.
The
authors
introduce
and
review
multipactor
in
RF
cavities
for
scientists
and
engineers
working
in
the
field
of
accelerator
physics
and
technology.
The
multipactor
phenomenon
of
unintended
electron
avalanches
occurs
in
the
RF
cavities
commonly
and
quite
often
is
a
performance-limiting
factor.
The
book
starts
with
an
Introductory
Overview
which
contains
historical
observations
and
brief
description
of
most
common
aspects
of
the
phenomenon.
Part
I
deals
with
the
multipactor
in
a
flat
gap.
It
starts
with
description
of
the
dynamics
of
electrons,
derivation
of
the
stability
condition
and
analyzing
influence
of
several
factors
on
the
multipactor.
Then,
the
initial
considerations
are
extended
to
derive
a
generalized
phase
stability
and
finally
a
particular
case,
called
ping-pong
multipacting,
is
considered.
The
part
one
is
concluded
with
a
brief
review
of
computer
codes
used
in
multipactor
simulations.
Part
II
is
dedicated
to
the
multipactor
in
crossed
RF
fields,
the
typical
situation
in
accelerating
cavities.
Two
cases
of
MP
are
considered:
a
two-point
multipactor
near
the
cavity
equator
in
elliptical
cavities
and
a
one-point
multipactor.
Part
III
describes
optimization
of
the
cavity
shapes
geared
toward
designing
multipactor-free
structures.
The
book
will
serve
as
an
importance
reference
on
multipactor
for
those
involved
in
developing
and
operating
radio
frequency
cavities
for
particle
accelerators.
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Specificații
ISBN-13: 9783030481971
ISBN-10: 3030481972
Dimensiuni: 155 x 235 mm
Ediția:1st ed. 2020
Editura: Springer
Colecția Springer
Seria Particle Acceleration and Detection
Locul publicării:Cham, Switzerland
ISBN-10: 3030481972
Dimensiuni: 155 x 235 mm
Ediția:1st ed. 2020
Editura: Springer
Colecția Springer
Seria Particle Acceleration and Detection
Locul publicării:Cham, Switzerland
Cuprins
Preface.-
Introductory
Overview.-
Part
I:
Multipactor
in
a
planar
gap.-
Existence
zones
for
a
multipactor
discharge.-
Introduction.-
Distribution
of
the
normal
velocity
components.-
Analysis
of
the
equation
of
motion.-
Stability
condition.-
Returning
electrons.-
Energy
constraints.-
Conclusion.-
Generalized
phase
stability
in
multipacting.-
Introduction.-
Distribution
of
initial
velocities
and
the
SEY
=
1
boundary.-
Stability
condition
for
different
points
of
the
multipacting
zone.-
Other
approaches
to
the
phase
stability
in
a
flat
gap.-
Conclusion.-
Ping-pong
modes.-
Introduction.-
Boundaries
of
the
ping-pong
modes.-
Stability
boundaries.-
Cutoff
boundaries.-
Lines
of
equal
impact
energy.-
Boundaries
of
the
two-surface
MP
and
overlapping
with
the
ping-pong
MP.-
Conclusion.-
Simulation
of
multipactor
in
a
planar
gap.-
General
codes.-
Codes
ad
hoc.-
Part
II:
Multipactor
in
crossed
RF
fields.-
Effect
of
the
RF
cavity
magnetic
field
on
multipactor
in
a
gap.-
Experimental
cavity
for
430
MHz.-
Inclusion
of
magnetic
field
into
equations
of
motion.-
Multipactor
near
the
cavity
equator.-
Introduction.-
Fields
near
equator.-
Dependence
of
the
upper
arc
fields
on
the
lower
arc
geometry.-
Equations
of
motion.-
Condition
of
stability.-
Multipacting
maps.-
Deviations
from
the
elliptic
geometry.-
Comparison
with
experiment.-
Conclusion.-
Belomestnykh.-
One-point
multipactor
in
crossed
fields
of
RF
cavities.-
Introduction.-
Fields
and
equations
of
motion
in
a
known
geometry
with
one-point
MP.-
Comparison
of
analytical
calculations
with
simulations
and
experiment.-
Influence
of
change
of
the
surface
electric
field.
Multipactor
map.-
Phase
and
space
stability.
Traveling
multipactor.-
Comparison
of
the
equations
of
motion
for
MP1
and
MP2.-
Discussion
and
conclusions.-
Part
III:
Multipacting-free
cavities
and
transitions
between
cavities
and
beampipes.-
Optimized
shape
cavities
free
of
MP.-
Introduction.-
Elliptic
geometry
and
surface
fields.-
Some
definitions.-
Method
of
optimization.-
More
constraints
to
the
shape
of
the
elliptic
cavity.-
An
example
of
optimization
for
the
TESLA
cavity.-
An
example
of
optimization
for
the
SNS
elliptic
cavity
with
bgeo
=
0.81.-
Multipactor
consideration.-
Conclusion.-
Multipacting-free
transitions
between
cavities
and
beam-pipes.
Theorem
on
minimal
electric
field.-
Introduction.-
Cavity
with
transition
from
iris
to
a
larger
diameter
beam-pipe.-
Cavity
with
a
tapered
end
port.-
Mechanism
of
the
motion.-
Conclusion.
Notă biografică
Dr.
Valery
Shemelinreceived
his
M.S.
degree
from
Novosibirsk
State
Technical
University
and
his
Ph.D.
degree
from
Budker
Institute
of
Nuclear
Physics
(Novosibirsk,
Russia)
where
he
worked
for
many
years
on
accelerator
projects.
Dr.
Shemelin
joined
Cornell
University’s
Laboratory
for
Elementary
Particle
Physics
in
2000
where
he
stayed
until
retirement
in
2014.
His
research
interests
are
concentrated
mainly
around
designing
accelerating
structures
and
cavities,
optimization
of
their
geometries,
studying
multipactor
discharge,
along
with
simulations
and
measurements
of
RF
properties
of
various
material
at
room
and
cryogenic
temperatures.
In
particular,
he
made
significant
contributions
to
developing
superconducting
radio
frequency
cavities
and
higher
order
mode
absorbers
for
Energy
Recovery
Linac
(ERL)
project
at
Cornell.
Dr.
Sergey
Belomestnykhis
a
Senior
Scientist,
Chief
Technology
Officer
and
Head
of
Applied
Physics
and
Superconducting
Technology
Division
at
Fermi
National
Accelerator
Laboratory
(Fermilab).
He
received
his
M.S.
degree
from
Novosibirsk
State
Technical
University
and
his
Ph.D.
degree
from
Budker
Institute
of
Nuclear
Physics
(Novosibirsk,
Russia)
where
he
worked
for
many
years
and
was
involved
in
several
accelerator
projects
developing
radio
frequency
(RF)
systems.
He
joined
Cornell
University’s
Laboratory
for
Elementary
Particle
Physics
in
1994,
working
on
developing
superconducting
RF
(SRF)
systems
for
Cornell
Electron
Storage
Ring
(CESR)
and
Cornell
ERL
as
a
CESR
RF
group
leader.
In
2010,
he
joined
Brookhaven
National
Laboratory.
In
his
capacity
as
a
Scientists
and
Superconducting
RF
group
leader,
Dr.
Belomestnykh
led
development
of
SRF
and
RF
systems
for
several
projects.
Since
2015,
he
is
with
Fermilab
overseeing
research
and
operations
of
a
large
Division
and
coordination
technology
development
throughout
the
laboratory.
He
is
an
Adjunct
Professor
at
the
Department
of
Physics
and
Astronomy,
Stony
Brook
University.
Dr.
Belomestnykh
is
a
Fellow
of
the
American
Physical
Society
and
a
recipient
of
the
2015
IEEE
NPSS
Particle
Accelerator
Science
and
Technology
Award
“for
achievements
in
the
science
and
technology
of
RF
and
SRF
for
particle
accelerators.
Textul de pe ultima copertă
This
book
is
written
by
two
world-recognized
experts
in
radio
frequency
(RF)
systems
for
particle
accelerators
and
is
based
on
many
years
of
experience
in
dealing
with
the
multipactor
phenomenon.
The
authors
introduce
and
review
multipactor
in
RF
cavities
for
scientists
and
engineers
working
in
the
field
of
accelerator
physics
and
technology.
The
multipactor
phenomenon
of
unintended
electron
avalanches
occurs
in
the
RF
cavities
commonly
and
quite
often
is
a
performance-limiting
factor.
The
book
starts
with
an
Introductory
Overview
which
contains
historical
observations
and
brief
description
of
most
common
aspects
of
the
phenomenon.
Part
I
deals
with
the
multipactor
in
a
flat
gap.
It
starts
with
description
of
the
dynamics
of
electrons,
derivation
of
the
stability
condition
and
analyzing
influence
of
several
factors
on
the
multipactor.
Then,
the
initial
considerations
are
extended
to
derive
a
generalized
phase
stability
and
finally
a
particular
case,
called
ping-pong
multipacting,
is
considered.
The
part
one
is
concluded
with
a
brief
review
of
computer
codes
used
in
multipactor
simulations.
Part
II
is
dedicated
to
the
multipactor
in
crossed
RF
fields,
the
typical
situation
in
accelerating
cavities.
Two
cases
of
MP
are
considered:
a
two-point
multipactor
near
the
cavity
equator
in
elliptical
cavities
and
a
one-point
multipactor.
Part
III
describes
optimization
of
the
cavity
shapes
geared
toward
designing
multipactor-free
structures.
The
book
will
serve
as
an
importance
reference
on
multipactor
for
those
involved
in
developing
and
operating
radio
frequency
cavities
for
particle
accelerators.
Caracteristici
Offers
a
comprehensive
description
of
multipactor
in
accelerating
cavities
for
scientists
and
engineers
Provides
theoretical
treatment
of
the
phenomenon,
ties
it
up
with
experimental
results,
and
provides
insights
on
developing
multipactor-free
accelerating
cavities
Includes
historical
overview
of
advances
in
understanding
multipactor