O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012 FAIR accelerator R&D Oliver Kester GSI...
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Transcript of O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012 FAIR accelerator R&D Oliver Kester GSI...
![Page 1: O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012 FAIR accelerator R&D Oliver Kester GSI Helmholtzzentrum für Schwerionenforschung Darmstadt and.](https://reader034.fdocuments.net/reader034/viewer/2022052310/5514a7ab55034640138b4c4c/html5/thumbnails/1.jpg)
O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
FAIR accelerator R&D
Oliver KesterGSI Helmholtzzentrum für Schwerionenforschung
Darmstadt and
IAP Goethe-Universität Frankfurt
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Outline
Introduction Challenges FAIR heavy ion accelerators Preparation of the injectors at GSI
Accelerator challenges and R&D High current ion sources Beam dynamics and cavities Injection / Extraction Cryomodules SIS100
Outlook
Introduction Challenges FAIR heavy ion accelerators Preparation of the injectors at GSI
Accelerator challenges and R&D High current ion sources Beam dynamics and cavities Injection / Extraction Cryomodules SIS100
Outlook
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
FAIR accelerator challenges
FLAIR
Superconducting magnets
Rf-cavities
Beam cooling
Diagnostic and XHV at highest intensities
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
UNILAC upgradeHigh power (high intensity),
short pulses Increase of beam brilliance (Beam
current / emittance) Increase of transported beam currents Improvements of high current beam
diagnostics / operation
SIS 18 upgradeFast ramping, enhanced intensity
per pulse Increase of injection acceptance Improvement of lifetime for low-
charged U-ions Increase of beam-intensity per time
due to reduction of SIS18- cycle time
Exchange of 35 years old Alverez accelerator
With modern interdigital H-type structures
Higher intensities 28 GHz ECRIS
Preparation of the injector chain
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Filament driven Vacuum Arc driven
MUCIS, MUCIS New,
CHORDIS
MEVVA, VARIS
Working material:
Gases Metalls and Gases
High Duty factor
PIG
Metalls and Gases
GSI high current sources
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
VARIS (Vacuum Arc Ion Source)Optimized for Uranium (67% of 238U4+)
Emission current density
170 mA/cm2
156 mA @ 32 kV
55 mA @ 131 kV
20 mA in front of the RFQ
9 mA behind the RFQ
Vacuum Arc Driven Sources
Improving the beam quality at plasma extraction
Improvement of beam transport Lifetime of cathodes 3 Hz operation
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
UNILAC modifications and the HE-linac
Ion source and beam transport upgrade 4 Alvarez tanks, almost 40 years old exchange by modern IH-structures Charge state stripper technology higher charge states (high intensities) High intensity beam diagnostics
HLI
Stripper und Separator 1.4 MeV/u
ALVAREZ
MUCIS,
MEVVA
PIG
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
H-Mode Resonators for LINACs
E-Field
B-Field B-Field
E-Field
IH-Structure(interdigital H-type)
4-vane RFQIH-RFQ
CH-Structure(cross bar H-type)
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
The FAIR Proton Injector
Beam Energy
Beam Current (design/oper.)
Beam Pulse
Repetition Rate
Frequency
Norm. Emittance at output
Momentum Spread
Beam Loading (peak)
RF Power (peak)
Klystron (3 MW Peak Power)
Solid State Amplifier (50 kW)
Total Length (RFQ + CH)
70 MeV
70 / 35 mA
36 µs
4 Hz
325.224 MHz
2.1 / 4.2 µm
≤ ± 10-3
4.9 MW
2.5 MW
7
3
≈ 27 m
CH-DTL
Klystron
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Charge state stripper for intense heavy ion beams
C-foil stripper
- short lifetime at highest intensities, but
highest charge states
gas stripper- High intensity capabilities, but lower
charge states
- Equilibrium charge state (efficiency)
10 m
mEdge of the foil before irradiation
Unused foil
Beam inBeam out Beam inBeam out
MIT Plasma window in a test setup at BNL
MIT Plasma window in a test setup at BNL
Plasma stripper- Need to increase the gas density – plasma
window for differential pumping
- Or dense plasma channel separated by
plasma windows
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Emittance transferT
K3
QS
5
Co
il P
air
TK
3Q
D6
Ver. Chicane skewed triplet
• pepper pottriplet
H3+ 3p
Fo
il S
trip
pe
r
→
0.0
0.4
0.8
1.2
1.6
2.0
2002 2003 2004 2005 2006 2007 2008 2009
Year
Bea
m B
rilli
anz
[em
A /
µm]
hor. achieved (Ar) unstripped
hor. FAIR Design (U73+)ver. achieved (Ar) unstripped
ver. FAIR Design (U73+)
Future
Ex*Ey = const
Reminder:
Bx/y:= (q/A)*Current / Emittancex/y
emittance transfer from horizontalto vertical plane should help to increase the injection efficiency
transfer should preserve xy
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
The Synchrotron
QuadrupoleQuadrupole
Sextupole
bending
correction
focusing
Magnetic field and rf-frequency areramped synchronousto the particle energy.
Magnetic field and rf-frequency areramped synchronousto the particle energy.
MagnetsMagnets
Dipole
qvBr
mv
2
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
SIS100 169 high current (> 4 kA) quadrupolesSIS100 Injection/Extraction 4 low current (< 1 kA) quadrupoles
Main Characteristics of the SIS100 quadrupole:B‘ = 27 T/m, Effective length = 1,3 m
A modules comprises:
• two quadrupoles,• multipole corrector, steerer,
chromaticity sextupole• cryocollimator• beam position monitor (BPM)
Complex system concerning:• Girders, bus bars• helium headers• thermal shield, cryostat• vacuum chamber
SIS100 Quadrupole modules
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Cold beam position monitorsIn SIS100 quadrupole modules
Signal transfer from 4 K levelto room temperature level
Cold BPMs
QDQD BPMBPM STST QDQD
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Cryocatcher in Quadrupole Module
SIS100 Qaudrupole Cryostat L. Bozyk
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Dynamic Vacuum effect and collimation
P. PuppelDipole
Target-Ionisation
Projectile-Ionisation
Coulomb-Scattering,Intra-Beam-Scattering
Desorption
adsorbed residual gas
U29+
Solid Body
Adsorbed Residual Gas
Desorbed Gas
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
0 10 20 30 40 50 60 70 80 90 1000.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I E
SR
/
I SIS
t (s)
ptrans
t
circulating, cooled beam
rf-Barriers
Creation of a gap for injection of additional particles
New injected bunch
Cooling
Circulation time
Stacking of particles in the FAIR storage rings
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Fast bunch rotation in the CR
Challenges:• Short bunch from SIS100 (50 ns)
• For stochastic cooling de-bunching required
• High voltage (200 kV) required for fast rotation and reduction of momentum spread after production target
Gap voltage 40 kV
Length 1 m
Rotation time ~ 100 s
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O. Kester, Jahrestagung des KHuK, Bad Honnef, 30.11.2012
Summary FAIR accelerator developments
High current ion sources and optimized beam transport
Cavity development for LINACS – H-type cavities
p-Linac and HE-Linac
Charge state stripper technologies
Emittance transfer – injection into synchrotrons
Cryogenic SIS100 modules and dynamic vacuum effect Accumulation of secondary particles via barrier
bucket injection
High current ion sources and optimized beam transport
Cavity development for LINACS – H-type cavities
p-Linac and HE-Linac
Charge state stripper technologies
Emittance transfer – injection into synchrotrons
Cryogenic SIS100 modules and dynamic vacuum effect Accumulation of secondary particles via barrier
bucket injection