The High Intensity Stable Ion Beams Working Group

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The High Intensity Stable Ion Beams Working
Group HISIB-WG
Marie-Helene Moscatello (GANIL) Annamaria
Porcellato (Legnaro) Uli Ratzinger (GSI) Faical
Azaiez (IPN-Orsay) Giacomo DeAngelis
(Legnaro) Sigurd Hofmann (GSI) Rolf-Dietmar
Herzberg (Liverpool) Rauno Julin (JYFL)
ECOS European COnsortium of Stable (beams)
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1st meeting (Paris, june 2004) discussion of
the group tasks and of the Work distribution
--The Science with high intensity stable ion
beams --Beam intensity limitations and technical
developments for various types of research
lines!
NZ nuclei (inbeam
spectroscopy and decay studies) G.
DeAngelis SHE search S. Hofmann Super heavy
nuclei (in-beam spectroscopy and decay studies)
R. D. Herzberg Neutron-deficient nuclei (in-beam
spectroscopy and decay studies) R.
Julin Exotic shapes and decay modes in nuclei
F. Azaiez Neutron rich nuclei using DIC
reactions F. Azaiez G. DeAngelis --Status
and future developments of existing facilities
LEGNARO A. Porcellato GANIL M. H.
Moscatello GSI S. HofmannU. Ratzinger
JYVASKYLA R. Julin
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Report to NuPECC at the Frascati meeting
-In-beam studies -Production ground state
properties and decay studies
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identified two categories of experiments Categori
es 1 Studies at the target Beam intensity
limitations due to electronics and data
acquisition up to 100pnA Categories 2 Studies
at the focal plan (of a spectrometer) Beam
intensity limitations due to target technology
up to 10 to 100pmA
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2nd meeting (Legnaro, Oct 2004) Discussion of
the work progress
-Report and discussions on the physics and the
experimental issues
-Discussion on the specifications of a dedicated
facility
-Report and discussions on the status and future
developments of existing facilities
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• The performance and requirements for the proposed
  
• high intensity stable beam facility
• The stable beam facility will be designed to meet
  the science needs and
• have capabilities beyond those presently
  available in Europe.
• -It should be able to accelerate all stable
  elements with a maximum energy ranging
• from 50MeV protons to 10MeV uranium and with beam
• intensities of more than 100pmA for the heaviest
  beams.
• -The accelerator should provide CW operation,
  excellent energy resolution,
• low transverse emittance,and flexible beam
  timing.
• A super-conducting linear accelerator in
  conjunction with a high performance ECR
• source is a good solution that meets all
  requirements for the needed high intensity
• stable beam facility.

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Existing facilities and their future upgrade
(in Europe)
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• JYFL-Jyväskylä
• Beams - E gt 5 MeV /nucleon
• Heavy and light ions available
• gt1pµA p, He, B, C, N, O, Ar
• gt100 pnA F, Ne, Mg, Al, Si, S, Cl, Ca, Fe, Cr,
  Ni,Cu, Zn, Kr
• gt10 pnA Ti, Mn, Ge, Sr, Zr, Ru, Xe

ECR developments for intensity upgrade A second
cyclotron will be built and installed
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Near future switching from a Tandem to a q
injector (PIAVE)
LEGNARO

• MORE CURRENT
• HEAVIER MASSES

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GANIL
Available stable beams
CSS1 beams from 12C (4 to 13.5 A.MeV) to 238U
(4 to 8 A.MeV) intensities several p?A for light
ions and lt 1 p?A for A gt 40 possibility of
simultaneous beams from SME and HE(using a
stripper) CIME beams from He to Xe (2 to 25
A.MeV depending on q/A) Intensities up to 80pnA
(safety limitation!) with a direct
beam line (DBL) from CIME to the G1 and G2
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GANIL
LINAG the driver of Spiral2
Spiral2 q/A1/3 ions 1mA (Ar) from 0.75 to 14.5
A.MeV able to accelerate 5mA D
beam up to 20 A.MeV lower
intensities avalaible (Cr, Ni,)
2nd step q/A1/6 ions 1mA (Xe) from 0.75 to
6.5 MeV/A
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GSI
Particle Current in the GSI-Unilac (routine
operation)
Ion Source
Transport line
HLI
Alvarez
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The UNILAC-upgrade at GSI

• New RFQ-structure
• gain of the duty factor
• higher injection energy
• increased acceptance
• Additional 28 GHz-ion-source
• intensity gain of factor two
• higher charge states for increased duty factor

intensity-gain factor x10
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3rd meeting (Jyvaskyla, march 2004)
-discussion of the first draft document

-discussion of the conclusions and recommendations
Today - report and discussions on the first
draft (mainly the conclusions) of the
working group!
Guide lines for the document -Certainly
shorter! -Nuclear astrophysics? -The case of
Dubna? -The conclusions!
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For the 1st category
The in-beam studies are envisaged to take
advantage of the existing stable beam facilities
at Jyväskylä and Legnaro. JYFL is currently
capable of providing up to 100pnA of several of
the stable beam species and is actively pushing
the necessary ion source RD to extend the list
of available beams. LNL is soon expected to
reach this level of beam intensities also for
very heavy nuclear beams (up tp U) once PIAVE
will routinely replace the tandem as the
injector for the ALPI linear accelerator The
recommendation of the committee is to ensure a
strong support from both the nuclear physics
community and the funding agencies for these two
facilities not only for their accelerator system
development but also for the instrumentation and
experimental infrastructure that are needed to
host dedicated research programs.
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An important recommendation is the development
of appropriate instrumentation that needs to keep
step with the increasing beam currents. The
in-beam spectroscopy (at the target) presents its
own set of challenges Cope with one to two order
of magnitude counting rates and data acquisition
(higher detector segmentation, digital
electronics, time stamping and Triggerless data
acquisition)
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For the 2nd category
The UNILAC upgrade will provide one order of
magnitude greater beam intensities than today.
This is a major improvement which will greatly
enhance the program to search and study super
heavy elements. The realisation of this up-grade
is considered highly important and the committee
lends it its full support.
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LINAG, the SPIRAL2 driver is another attractive
possibility as it fully matches the
specification of the needed high intensity
stable ion beam facility, a significant amount
of beam time is foreseen to be used for
the production of high intensity light and medium
mass stable ion beams This project is
recommended as a first step to the desired
facility. It is an important proof of
feasibility and test bunch for all technical
issues related to very high intensity heavy ion
beams.
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It is clear that the use of the upgraded UNILAC
and the very intense light and medium beams from
LINAG is an attractive short-medium range
perspective for the community from the point of
view of the physics opportunities and also from
the point of view of the possibilities of testing
and improving instruments and methods. The
long term goal for a new dedicated high intensity
stable ions facility in Europe is considered to
be one of the important issues to be discussed
and considered in the next Long Range Plan of
the nuclear physics community.
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In order to be ready for this new project it is
also highly important that research and
development on the various related keys issues
such as target, spectrometers and ion sources,
are initiated and organised at the European in
synergy with future RNB projects.