the small isochronous ring project at michigan state university
DESCRIPTION
THE SMALL ISOCHRONOUS RING PROJECT AT MICHIGAN STATE UNIVERSITY. J. Alberto Rodriguez. OUTLINE:. Introduction Injection and Extraction Lines of SIR Simulations & Experimental Results Conclusions. Several authors have proposed using high power cyclotrons for different applications. - PowerPoint PPT PresentationTRANSCRIPT
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THE SMALL ISOCHRONOUS RING PROJECT AT MICHIGAN STATE UNIVERSITY
J. Alberto Rodriguez
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• Introduction
• Injection and Extraction Lines of SIR
• Simulations & Experimental Results
• Conclusions
OUTLINE:
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INTRODUCTION
• Several authors have proposed using high power cyclotrons for different applications.
• The space charge forces at these current levels (~ 10 mA) become very important and must be considered when such a machine is designed.
• Some understanding about space charge effects in the isochronous regime exists, although this knowledge is not yet complete.
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Turn separation
R
RINJ
REXT
ExtractionDeflector
Effects of the longitudinal space charge electric field:
• Energy spread within the bunch.
• Increase effective radial size.
• Destroys turn separation.
• Losses in extraction deflector.
v
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• Preliminary simulations showed a break up of the bunch.
y (cm)
x (c
m)
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Space charge forces scale with:
35
hm
Iqk AV
AV
BUNCHPEAKAV R
LhII
2
PSI Injector II (first turn)
SIR PSI Main Cyclotron
(first turn)
SIR
Ion H+ H2+ H+ H2
+
E 870 keV 20 keV 72 MeV 20 keV
IPEAK 34 mA 13 μA 290 mA 9 μA
Same k Same k
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Advantages of SIR:
• Time resolution of the diagnostics is much less demanding.
• Beam power is much lower.
• Availability is not an issue.
• Larger space charge forces than in PSI Injector II.
• Possibility of studying turn by turn evolution.
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Ion Source
Einzel Lens
Mass Separator
Emittance Measurement
System
Quadrupole Triplet
Chopper
Inflector Plates
Faraday Cup
Fast Faraday Cup
Deflector Plates
Injection Diagnostics
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Ion Source
Einzel Lens
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Quadrupole Triplet
Chopper
Inflector Plates
Faraday Cup
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Fast Faraday Cup
Deflector Plates
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• Methodology used in the analysis
• Scaling with bunch length, peak current and energy
• Impact of the beam emittance
• Energy spread within a bunch
• Repeatability of experimental measurements
• Experiments vs. Simulations
SIMULATIONS & EXPERIMENTAL RESULTS
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Methodology used in the analysis
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Scaling with bunch peak current
)( AITTEQ
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Impact of the beam emittance
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Energy spread within a bunch
)( AITTEQ
)(keVE
TTEQ
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Repeatability of experimental measurements
To = 0
To = 1 ms
To = 2 ms
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I = 5 μAI = 9.9 μA
I = 19.9 μA
Scaling with bunch peak current
)( AITTEQ
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Experiments vs. Simulations
Simulations
Experiments
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• The Small Isochronous Ring (SIR) has been completed.
• The control and data acquisition system of SIR has been finalized.
• Extensive simulations have been performed to characterize the impact of bunch length, current, energy and emittance on the bunch dynamics.
• The scaling laws of space charge effects with energy and current have been validated numerically and experimentally.
• Good agreement between experiments and simulations performed with CYCO has been shown.
CONCLUSIONS