CW operation of the fmit RFQ accelerator

Cornelius, W. D.

doi:10.1016/0168-583x(85)90126-0

Cited by 16 publications

(6 citation statements)

References 2 publications

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“…Radiation damage due to neutron-induced transmutations can be as important as displacement damage to determine the suitability of a given material. In fusion reactors, the hard neutron spectrum at the first wall will lead to a helium production ratio of around 12 appm/dpa, mainly through 56 Fe(n, α) 53 Cr reactions (in fission reactors, this ratio is 0.3 appm/dpa, owing to the 3.7 MeV threshold of the reaction) [4]. The accumulation of He has a significant impact on mechanical properties even with low concentrations; He-induced embrittlement, already a concern for fission materials, becomes even more critical for fusion materials.…”

Section: Fusion-relevant Neutron Sources: the Essential Missing Step ...mentioning

confidence: 99%

“…The underlying technology was not ready in early phases of the program. This was learnt in FMIT in the early 80s when insurmountable difficulties were faced in terms of operating an accelerator as initially specified [53] (deuterons at 100 mA in CW at 35 MeV) to reach the suitable 14 MeV neutrons fluence in testing specimens within a reasonable testing time. It has only been 25 years later, during the ongoing IFMIF/EVEDA project, that successful efforts to demonstrate the feasibility of a Li(d, xn) have been developed with the construction of hardware validating the nominal operational conditions.…”

Section: The Technological Maturity Of a Li(d Xn) Concept Being Asses...mentioning

confidence: 99%

“…The first world attempt for a CW low-β high current H accelerator in FMIT, framed by fusion materials research, taught us the difficulty of the challenge [53]; our technology was not ready. The operation was strongly affected by the cathode-based poorly performing ion sources with two crucial shortcomings: (a) the availability of the cathode and (b) the quality of the beam from its source.…”

Section: Feasibility Of a 125 Ma Cw Deuteron Beams At 40 Mevmentioning

confidence: 99%

“…A deuteron beam was not used to avoid activation problems under the wrong assumption that + H 2 would behave similarly, however stripping and dissociation of + H 2 led to large neutral and H + beam halos which damaged output beamline components. In 1984, the project was canceled due to escalating costs [56], driven by the impossibility of reaching the target of 100 mA CW + H 2 at 2 MeV [53]. After FMIT's accelerator failing lessons, it was perceived by accelerators experts as impossible operational conditions those required by a Li(d, xn) fusion-relevant neutron source.…”

Section: Feasibility Of a 125 Ma Cw Deuteron Beams At 40 Mevmentioning

confidence: 99%

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Overview of the IFMIF/EVEDA project

Knaster¹,

Garin

Matsumoto

et al. 2017

Nucl. Fusion

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IFMIF, the International Fusion Materials Irradiation Facility, is presently in its engineering validation and engineering design activities (EVEDA) phase under the Broader Approach Agreement. The engineering design activity (EDA) phase was successfully accomplished within the allocated time. The engineering validation activity (EVA) phase has focused on validating the Accelerator Facility (AF), the Target Facility and the Test Facility (TF) by constructing prototypes. The ELTL at JAEA, Oarai successfully demonstrated the long-term stability of a Li flow under the IFMIF’s nominal operational conditions keeping the specified free-surface fluctuations below ±1 mm in a continuous manner for 25 d. A full-scale prototype of the high flux test module (HFTM) was successfully tested in the HELOKA loop (KIT, Karlsruhe), where it was demonstrated that the irradiation temperature can be set individually and kept uniform. LIPAc, designed and constructed in European labs under the coordination of F4E, presently under installation and commissioning in the Rokkasho Fusion Institute, aims at validating the concept of IFMIF accelerators with a D+ beam of 125 mA continuous wave (CW) and 9 MeV. The commissioning phases of the H+/D+ beams at 100 keV are progressing and should be concluded in 2017; in turn, the commissioning of the 5 MeV beam is due to start during 2017. The D+ beam through the superconducting cavities is expected to be achieved within the Broader Approach Agreement time frame with the superconducting cryomodule being assembled in Rokkasho. The realisation of a fusion-relevant neutron source is a necessary step for the successful development of fusion. The ongoing success of the IFMIF/EVEDA involves ruling out concerns about potential technical showstoppers which were raised in the past. Thus, a situation has emerged where soon steps towards constructing a Li(d,xn) fusion-relevant neutron source could be taken, which is also justified in the light of costs which are marginal to those of a fusion plant.

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Section: Fusion-relevant Neutron Sources: the Essential Missing Step ...mentioning

confidence: 99%

Section: The Technological Maturity Of a Li(d Xn) Concept Being Asses...mentioning

confidence: 99%

Section: Feasibility Of a 125 Ma Cw Deuteron Beams At 40 Mevmentioning

confidence: 99%

Section: Feasibility Of a 125 Ma Cw Deuteron Beams At 40 Mevmentioning

confidence: 99%

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Overview of the IFMIF/EVEDA project

Knaster¹,

Garin

Matsumoto

et al. 2017

Nucl. Fusion

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“…The treatment procedure uses a hot, current-carrying titanium-alloy wire (75% tantalum, 25% titanium) in a nitrogen-rich atmosphere. 1 To assure a high probability of nitride formation, an ammonia atmosphere (NH 3 ) at a pressure of about 1-um is used, while the thickness of the nitride coating is monitored by observing surface resistance on a glass slide in the same cavity. The TiN surface layer has good properties, cannot be easily scrubbed off, and leaves a slight golden color on the surfaces treated.…”

Section: Design Featuresmentioning

confidence: 99%

Design of high-power radio-frequency drive loops for operation into 425-MHz linear accelerators

Liska¹,

Dauelsberg²

1988

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Recent designs for ultra high-frequency (UHF) band accelerators have prompted the need for high-powered drive loops compatible with the peak and average power needs of the accelerator tanks. Two such loops have been developed in the Accelerator Technology (AT) Division at Los Alamos and are now part of the general accelerator inventory. One loop is of small size, appropriate for radio-frequency quadrupole (RFQ) injector-accelerators, and is rated at 500-kW peak, 2-ms pulse length and 5% duty factor. The other loop is a 1-MW design, physically larger, also rated at 2-ms pulse length and 5% duty factor. The 1-MW drive loop uses a flat-disk ceramic window. The 500-kW loop as developed can use either a flatdisk window or a special A/2 window module available from Oak Ridge National Laboratory (ORNL).The purpose of this note is to describe the design of these loops and the tests performed on them so that they might be used by design engineers with appropriate applications.

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