3 May 2017
ISOLDE
Physics
Group
Meeting
03/05/2017
Technical
news
• HRS
– Vito
(35Ar)
were
the
main
users
(IS601)
with
1
shift
for
IDS
taking
(17N)
for
calibrations.
– There
was
a
mix
up
when
switching
beam
settings
between
IDS
and
VITO,
which
lead
to
lost
time
at
VITO.
– No
changes
had
been
made
to
target
parameters
when
switching
(as
agreed;
may
need
to
re-use
this
target
for
VITO
later
this
year).
– However,
overlapping
arrays
meant
parameters
were
overwritten/changed.
– In
addition
the
RFQ
settings
could
not
be
recovered
due
to
a
new
software
limit,
which
had
been
installed
earlier
that
day
– This
has
since
been
removed,
but
was
implemented
to
prevent
overheating
of
the
amplifier.
– Tim/Stuart
are
making
a
manual
to
prescribe
the
future
operation.
• GPS
– Proton
scan
took
6.5
hours
due
to
badly
setup
separator;
the
beam
was
poorly
set
up
on
the
horizontal
plane.
– It
was
noticed
that
an
element
had
drifted.
– Fixed/noticed
at
5pm
and
p+
scan
completed,
but
no
yield
measurements
were
possible
due
to
this
delay.
– Independent
HV
trips
on
both
the
target
and
the
line.
No
reason
found
e.g.
no
vacuum
spike,
but
this
has
been
seen
many
times
before.
– Drift
in
magnet
field/voltages
reported
by
IDS.
Tuning
appeared
to
not
be
optimum
and
transmission
drifted
to
10%;
recovered
to
65%.
– The
cause
could
not
be
identified,
but
Timber
will
be
used
to
look
at
the
data.
Data
from
scanners
etc.
not
possible
yet.
Elefteris
is
coding
this
into
the
system.
• REX/HIE
– Bake
out
of
REX
is
finished.
– Cooling
of
cryomodules
has
been
improved,
which
will
lead
to
fewer
trips
during
operation.
• RILIS
– Indium
setup
continuing
for
upcoming
runs
at
IDS
and
CRIS.
• Targets
– #595
worked
well
last
week.
– #597
being
installed
now.
– MEDICIS
monotrack
system
was
used,
meaning
that
the
time
to
change
the
target
was
reduced
from
2
hours
to
only
30
minutes,
and
no
access
was
required
in
the
zone.
Physics
news
• VITO
– β-asymmetry
studies
with
35Ar.
– Motivation
is
fundamental
physics
and
the
Vud
matrix
element.
– Preliminary
studies
searching
for
appropriate
crystal
that
can
operate
at
high
temperatures,
whilst
maintaining
the
polarization
for
a
long
time.
Relaxation
time
vs.
nuclear
lifetime.
– Avoid
low
temperatures
(<100K)
as
much
as
possible
to
prevent
freezing
dirt
onto
the
surface
of
the
crystal.
– Total
of
5
candidate
crystals,
2
measured
in
this
beam
time.
– 1st
crystal
showed
some
asymmetry
at
low
temperatures
(~10K).
– 2nd
crystal
(NaF)
maintained
reasonable
asymmetry
at
room
temperature.
Magnitude
is
10x
more
than
1st
crystal,
but
still
not
huge.
– Polarisation
of
lasers
should
also
be
checked.
• IDS
– 133Sn
being
studied
in
β-decay
of
133In.
Also
had
134In
β-n
decay.
– Motivation
is
the
single-particle
structure
with
one
neutron
outside
of
the
doubly-magic
132Sn
core.
– Chances
to
use
RILIS
lasers
to
make
isomer
selection,
enhancing
population
of
low-spin
or
high-spin
states
in
the
daughter
nucleus.
– Neutron
ToF
spectra
obtained
and
states
have
been
identified.
– Goal
to
make
coincidences
between
neutrons
and
gammas;
analysis
is
ongoing.
– A
lot
of
contamination
on
these
masses
for
Cs:
20
kBq
at
mass
A=133
and
65
kBq
at
mass
A=134
(in
only
8
hours).
T1/2
=
10
yrs
and
2
hrs,
respectively.
IDS
passed
on
this
advice
to
CRIS
for
the
following
run,
which
will
explore
a
similar
region.
• CRIS
– Laser
spectroscopy
of
n-rich
In
isotopes.
– Motivation
is
again
in
the
proximity
to
132Sn
and
shell-closures.
– Everything
beyond
128In
will
be
new
for
laser
spectroscopy.
– Aim
to
measure
charge
radii
and
moments
via
high-resolution
hyperfine
spectra.
A.O.B.
• European
Researcher
Night
– ISOLDE
would
like
to
be
involved,
or
at
least
CERN
would
like
ISOLDE
to
be
involved,
this
year.
It’s
in
September.
– Interest
from
French
speakers
would
be
good
as
much
of
the
audience
will
be
the
local
community
in
the
Meyrin
region.
– If
interested,
contact
Karl
to
discuss
as
the
promotional
material
is
expected
to
be
printed
and
advertised
a
long
time
in
advance.
• Safety
courses
– Nobody
signed
up
for
safety
courses
on
16th
May
yet.
Please
inform
Karl
or
it
will
be
cancelled.
• Operations
team
– New
operator
from
PS
who
will
take
over
piquet
duties
from
Pascal.
His
name
is
Simone
and
he
is
training
and
gathering
experience.
• Setups
– WITCH
will
start
up
in
the
week
of
June
12th.
The
magnet
will
be
ramped
up
for
a
couple
of
days
or
nights
and
should
be
communicated
with
accelerator
people.
– A
new
policy
of
oil-free
pumps
in
the
HIE-ISOLDE
extension
is
to
be
adopted
after
contamination
at
Miniball
last
year.
– Dirty
exhaust
lines
will
be
replaced
before
the
campaign.
• INTC
– LOIs
for
stable
and
long-lived
beams
are
requested
at
the
next
INTC
meeting
in
June.
Minutes
taken
by
LPG
Date
2017-05-03