Beam measurements at the GSI high current injector

Barth, W.; Dahl, L.; Glatz, J.; Forck, P.; Klabunde, J.

doi:10.1109/pac.2001.988084

Cited by 8 publications

(9 citation statements)

References 3 publications

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“…Universal Linear Accelerator (UNILAC) serves as the injector for the heavy-ion accelerator facility at GSI [104]. It can accelerate beams of any stable isotope from protons to uranium to a maximum energy of about 20 MeV/u.…”

Section: Sis-frs-esr Radioactive Beam Facility At Gsi Thementioning

confidence: 99%

Beta decay of highly charged ions

2010

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Beta decay of highly charged ions has attracted much attention in recent years. An obvious motivation for this research is that stellar nucleosynthesis proceeds at high temperatures where the involved atoms are highly ionized. Another important reason is addressing decays of well-defined quantum-mechanical systems, such as one-electron ions where all interactions with other electrons are excluded. The largest modifications of nuclear half-lives with respect to neutral atoms have been observed in beta decay of highly charged ions. These studies can be performed solely at ion storage rings and ion traps, because there high atomic charge states can be preserved for extended periods of time (up to several hours). Currently, all experimental results available in this field originate from experiments at the heavy-ion complex GSI in Darmstadt. There, the fragment separator facility FRS allows the production and separation of exotic, highly charged nuclides, which can then be stored and investigated in the storage ring facility ESR. In this review, we present and discuss in particular two-body beta decays, namely bound-state beta decay and orbital electron capture. Although we focus on experiments conducted at GSI, we will also attempt to provide general requirements common to any other experiment in this context. Finally, we address challenging but not yet performed experiments and we give prospects for the new radioactive beam facilities, such as FAIR in Darmstadt, IMP in Lanzhou and RIKEN in Wako.

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Section: Sis-frs-esr Radioactive Beam Facility At Gsi Thementioning

confidence: 99%

Beta decay of highly charged ions

2010

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“…In the High Current Injector (HSI) [3] comprising an IH-RFQ and an IH-DTL, the beam is accelerated up to 1.4 MeV/u. The gas stripper section [4] provides for a higher charge state. During standard operation the U 28+ -beam is matched to the Alvarez DTL.…”

Section: Overview -Injector Linacs For Fair and The Unilac-user Programmentioning

confidence: 99%

LINAC developments for heavy ion operation at GSI and FAIR

Barth¹,

Hollinger²,

Adonin³

et al. 2020

J. Inst.

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The first cavity of a standalone superconducting (sc) continuous wave (cw) heavy ion Linac as a demonstration of the capability of 217 MHz multi gap Crossbar H-mode structures (CH) has been already commissioned at high acceleration gain. The worldwide first beam test with a superconducting multi gap CH-cavity was a milestone of the R&D work of HIM and GSI in collaboration with Goethe University Frankfurt (GUF) in preparation of the sc cw heavy ion Linac project, substituting GSI-UNILAC as a heavy ion high duty factor Linac. Recently the first two of four fully equipped cw-Linac cryomodules are in procurement. To meet the future FAIR science requirements higher beam intensity has to be achieved in the present GSI-accelerator complex. In the last years ion source developments, in particular for the high current Vacuum Arc Ion Sources (VARIS), were concentrated on heavy elements, as Bi and Pb, aiming for stable routine ion source operation at a sufficient rep. rate and high production efficiency. Stripping is a key technology for all heavy ion accelerators. After upgrade of the supersonic N 2 -gas jet implementation of high current foil stripping, recently a new H 2 gas cell, using a pulsed gas regime synchronized with arrival of the beam pulse has been developed. An enhanced stripper gas density as well as a simultaneously reduced gas load results in an increased stripping efficiency, while the beam emittance remains the same. A new record beam intensity (11.1 emA) for 238 U 28+ beams at 1.4 MeV/u has been achieved, applying the pulsed high density H 2 -stripper target to a high intensity 238 U 4+ beam from the VARIS ion source. Further ion source developments have been accomplished recently providing for sufficient heavy ion beam intensities at the High Current Injector Linac. A machine investigation program has been performed in 2020. The focus was to optimize the entire FAIR injector chain for high intensity heavy ion beam after the successful implementation of different upgrade measures. Besides a dedicated operation mode applying UNILAC, as a heavy ion Linac, at a synchronous phase significantly lower than 30 degrees for high intensity proton beam, could be established. Thus, UNILAC is able to deliver a sufficient proton beam intensity for the FAIR commissioning phase, when the FAIR-proton Linac is not yet available.

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“…TL and optically stimulated luminescence dosimeters have many advantages over currently used dosimeters in radiotherapy and space dosimetry (9) with heavy charged particles. Heavy ion beams have been used for diagnostic and therapeutic purposes (10). The treatment with highly energetic ion beams has several advantages in comparison with conventional irradiation with photons.…”

Section: Introductionmentioning

confidence: 99%

Effect of 100 MeV swift Si⁸⁺ions on structural and thermoluminescence properties of Y₂O₃:Dy³⁺nanophosphor

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Radiation Effects and Defects in Solids

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Nanoparticles of Y 2 O 3 :Dy 3+ were prepared by the solution combustion method. The X-ray diffraction pattern of the 900°C annealed sample shows a cubic structure and the average crystallite size was found to be 31.49 nm. The field emission scanning electron microscopy image of the 900°C annealed sample shows wellseparated spherical shape particles and the average particle size is found to be in a range 40 nm. Pellets of Y 2 O 3 :Dy 3+ were irradiated with 100 MeV swift Si 8+ ions for the fluence range of 3 × 10 11_ 3 × 10 13 ions cm −2 . Pristine Y 2 O 3 :Dy 3+ shows seven Raman modes with peaks at 129, 160, 330, 376, 434, 467 and 590 cm −1 . The intensity of these modes decreases with an increase in ion fluence. A well-resolved thermoluminescence glow with peaks at ∼ 414 K (T m1 ) and ∼ 614 K (T m2 ) were observed in Si 8+ ion-irradiated samples. It is found that glow peak intensity at 414 K increases with an increase in the dopant concentration up to 0.6 mol% and then decreases with an increase in dopant concentration. The high-temperature glow peak (614 K) intensity linearly increases with an increase in ion fluence. The broad TL glow curves were deconvoluted using the glow curve deconvoluted method and kinetic parameters were calculated using the general order kinetic equation. ARTICLE HISTORY

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Beam measurements at the GSI high current injector

Cited by 8 publications

References 3 publications

Beta decay of highly charged ions

Beta decay of highly charged ions

LINAC developments for heavy ion operation at GSI and FAIR

Effect of 100 MeV swift Si⁸⁺ions on structural and thermoluminescence properties of Y₂O₃:Dy³⁺nanophosphor

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Beam measurements at the GSI high current injector

Cited by 8 publications

References 3 publications

Beta decay of highly charged ions

Beta decay of highly charged ions

LINAC developments for heavy ion operation at GSI and FAIR

Effect of 100 MeV swift Si8+ions on structural and thermoluminescence properties of Y2O3:Dy3+nanophosphor

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Effect of 100 MeV swift Si⁸⁺ions on structural and thermoluminescence properties of Y₂O₃:Dy³⁺nanophosphor