Report from: the High Intensity Stable Beam Working Group

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Report from the High Intensity Stable Beam
Working Group HISB-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 june 2004 in Paris Work
distribution Beam intensity limitations and
technical developments for various types of
research lines!
NZ nuclei (inbeam
spectroscopy and decay studies) DeAngelis SHE
search Hofmann Super heavy nuclei (in-beam
spectroscopy and decay studies)
Herzberg Neutron-deficient nuclei (in-beam
spectroscopy and decay studies) Julin Exotic
shapes and decay modes in nuclei Azaiez Neutron
rich nuclei using DIC reactions Azaiez
DeAngelis Status and future developments of
existing facilities LEGNARO Porcellato GANIL
Moscatello GSI HofmannRatzinger JYVASKYLA
Julin
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2nd meeting Oct 2004 in Legnaro Discussion
of the work progress
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Report on physics and Experiment
issues identified two categories of
experiments Categories 1 Studies at the
target Beam intensity limitations due to
electronics and data acquisition
up to 100pnA Categories
2 Studies at the focal plan Beam intensity
limitations due to target technology
up to 10pmA
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Report on the status and future developments of
existing facilities -JYVASKYLA Julin
-LEGNARO Porcellato -GANIL Moscatello -GSI
HofmannRatzinger
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JYFL-Jyväskylä K130 AVF Cyclotron
JYFL Ion Sources
14 GHz ECR
6.4 GHz ECR
Multicusp H- source
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JYFL-Jyväskylä
A relatively new machine
Mainly for nuclear structure physics
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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 -Collabora
tion with ANL Argonne, EURONS JRA- ISIBHI -New
MIVOC compound for Titanium, Two-frequency ECR
ion source -New magnetic multipole structure for
better confinement of the ECR plasma
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TandemALPI and the PIAVE-Injector
LEGNARO
SC Booster ALPI
Upgraded
EX. Hall 3
Positive Ion Injector PIAVE
Under Commissioning
ECRIS Alice
350kV platform
Reliable
XTU-Tandem
EX. Halls 1 and 2
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Present ALPI output energy Tandem injector
LEGNARO
Tandem 15 MV F,F 1998 11 Pb/Cu cryostats 2003
13 Nb/Cu cryostats
ALPI
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Near future switching from a Tandem to a q
injector (PIAVE)
LEGNARO

• MORE CURRENT
• HEAVIER MASSES
• MORE BEAM TIME AVAILABLE (TWO INJECTORS)

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Energy output PIAVE injection, 2004 ALPI
LEGNARO
PIAVE - 2 SRFQs at the design accelerating
fields - 8 low b resonators at 5
MV/m
ALPI - 12 low b resonators operating at 4.4
MV/m - 44 medium b resonators
operating at 4.4 MV/m - 8 high b
resonators operating at 5.5 MV/m
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LEGNARO

• Present authorization limits
• -For ions from Si to Pb E lt 20 MeV/u , I lt
  -30 pnA on target
• -For ions from C to Al Elt 26 MeV/u , Ilt2
  pnA on target

Future With ion sources delivering 5 mA for
typical beams, the 100pnA Intensity will be
achieved for most of the accelerated ions!

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GANIL
Available stable beams at Ganil
DBL
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 in
SME and HE experimental areas
(using a stripper) CIME beams from He to Xe
a few pnA between 2 and 25 A.MeV
depending on q/A with a direct beam line
(DBL) from CIME to the G1 and G2
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GANIL
Ongoing RD
Ion production methods development of Ni, Ca,
Ge
Needed RD If necessary, possibility of
increasing the intensity of light ions, by adding
a rebuncher at the entrance of the C01 injector
cyclotron (the light ion intensity limitation is
due to space charge effects near the cyclotron
injection)
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GANIL
Spiral2 project
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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GANIL
Spiral2 project

• Associated RD
• The accelerator is based on almost known
  technology (normal conducting
• RFQ, quarter-wave SC cavities for the SC linac,
  the couplers have to be
• developed for 10 to 20 kW/cavity (under design).
• The challenge is mainly the high intensity to be
  accelerated, without
• any losses
• during the construction phase, development of
  high intensity q/A1/3
• beams like Cr, Ni with the GTS source (ex.
  SBT/CEA source) at Ganil
• during the APD and construction phase,
  development of a new source
• (APHOENIX) that will produce 1mA beams with A as
  high as possible

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GSI
Particle Current in the GSI-Unilac (routine
operation)
Isotope Ion SourcepµA Experiment pµA
40Ca7 3.6 0.5
48Ca7 2.0 0.5
54Cr7 1.7 0.9
58Fe8 1.1 0.5
70Zn10 1.6 0.6
Ion Source
Transport line
HLI
Alvarez
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3 versions of the UNILAC-upgrade at
GSI GSI(I) GSI(II) GSI(III) (recently
submitted to an expert committee for evaluation)
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New Front-end for the High Charge State Injector
50 duty factor ? intensity-gain factor x2
GSI (I)

• 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
• LEBT Laminated magnets
• redundance for ion sources
• preparation for future pulse to pulse operation
  with different ion-species

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GSI (II)
U. Ratzinger CW Linac Room Temperature Part
HLI-RFQ
HLI-IH
Rebuilt of the HLI with small modifications
Improved mechanical design with respect to
cooling, especially Cooling of the IH drift
tubes. Cooling of the RFQ mini vanes.
Improvement of longitudinal beam dynamics.
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Project for a Superconducting CW-linacU.
Ratzinger et al. University of Frankfurt

• Intensity gain
• Duty cycle 30?100 3.5
• 28 GHz ECR-source (sc) 2-10(?)
• increased stability (65 ? 85) 1.3
• shorter shutdowns (107 d/y ? 47 d/y) 1.2
• Total gain 11-55(?)

• dc beam
• 1 lt A/q lt 7
• Ebeam 4-7.5 MeV/u
• ?Ebeam lt ? 3keV/u

GSI (III)
normal conducting
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Next ECOS meeting will be held in Jyvaskyla on
the 28 February and 1 of March 2005. Discussion
of conclusions and recommendations A written
report will be hopefully ready for the next
NuPECC meeting ( March in Debrecen)!