The PAMS/GDP Process for Production of ICF Target Mandrels

McQuillan, B.W.; Nikroo, A.; Steinman, David A.; Elsner, Fred; Czechowicz, D. G.; Hoppe, M.; Sixtus, M.; Miller, W.J.

doi:10.13182/fst31-381

Cited by 103 publications

(30 citation statements)

References 2 publications

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“…Basically the capsules are produced by sputtering Be and as needed co-sputtering Cu onto CH mandrels (McQuillan et al, 1997;Nikroo et al, 2004) in a bounce pan. Variation in the power to the Cu-sputter-gun allows one to precisely control the radial Cu concentration in the deposited material, and meeting the specification outlined in the previous section has not been a problem.…”

Section: Capsule Fabricationmentioning

confidence: 99%

National Ignition Facility target design and fabrication

et al. 2008

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The current capsule target design for the first ignition experiments at the NIF Facility beginning in 2009 will be a copper-doped beryllium capsule, roughly 2 mm in diameter with 160-µm walls. The capsule will have a 75-µm layer of solid DT on the inside surface, and the capsule will driven with x-rays generated from a gold/uranium cocktail hohlraum. The design specifications are extremely rigorous, particularly with respect to interfaces, which must be very smooth to inhibit Rayleigh-Taylor instability growth. This paper outlines the current design, and focuses on the challenges and advances in capsule fabrication and characterization; hohlraum fabrication, and D-T layering and characterization.2

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Section: Capsule Fabricationmentioning

confidence: 99%

National Ignition Facility target design and fabrication

et al. 2008

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“…Thus, more flexible adjustment of the tracer (Cl in this case) deposition becomes possible compared to the case (iii). Recently the prototype of multilayered TESPEL has been realized by modifying the microencapsulation method [5] originally developed for the inertial-fusion-energy fuel pellet. The TESPEL consists of the outer layer of (C 8 H 8 ) n with a diameter of 0.64 mm, and the inner layer of (C 8 H 6 Cl 2 ) n with a diameter of 0.39 mm.…”

Section: Development Of Tespel Configurations For Plasma Diagnosticsmentioning

confidence: 99%

Development of TESPEL Configurations for Plasma Diagnostics

Sudo

Tamura

Suzuki

et al. 2014

Plasma and Fusion Research

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A Tracer-encapsulated Solid Pellet (TESPEL) injection method has been shown to be useful for many fields of plasma diagnostics. In order to provide more flexibility for such plasma diagnostics, we are developing various types of TESPELs. Here we report a new type TESPEL with a thin shell made of poly-dichlorostyrene useful for the impurity transport study. The new multilayer TESPEL configuration is also discussed. This type of TESPEL is not only useful for impurity transport study but also for the neutron observation due to the transient increase of the deuterium in the local position in the plasma for the upcoming LHD D-D experiment. A Tracer-encapsulated Solid Pellet (TESPEL) injection method has contributed so far to the various fields of plasma diagnostics as reported [1]. However, we noticed that more detailed control of the tracer deposition location is necessary in particular for promoting the impurity transport study. Thus, we are developing new TESPEL configurations for aiming at more flexible tracer deposition with a multilayer concept. From the technical viewpoint, regarding the production of the conventional TESPEL, we need to first drill a polystyrene ball, then insert relevant tracers, and, finally, cover the hole with a tiny polystyrene ball as a lid. Making TESPELs thus requires much time. Moreover, the tracer material is often in an irregular form, so it is difficult to estimate the precise amount of the tracer, although it is possible to estimate the amount roughly from the visually observed volume. In order to solve these problems, a new type TESPEL with mixing tracers as a compound or as a colloidal dispersion in the base polystyrene becomes a candidate.Recently we reported two types of TESPEL configurations [1], namely, (i) thick-shell-type and (ii) thin-shelltype [2] for the accurate impurity transport diagnostics. In particular, it was shown that the impurity transport feature depends on the source location of the impurity and also on the collisionality (between impurities and bulk ions).Regarding (i), the polystyrene ball (polymer in the form of (C 8 H 8 ) n ) with a diameter of up to 0.9 mm is drilled with a typical diameter of 0.2 mm, and the tracers are put inside the polystyrene ball, and then the hole is covered with a tiny polystyrene ball (a typical diameter of 0.2 mm) as a lid. In case (ii), the polystyrene shell with a typical shell thickness of ∼75 µm is produced for the shallower

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“…A typical plastic mandrel 6 is ~2 mm in diameter with a wall thickness of ~14 µm, and is composed of glow discharge polymer (GDP) whose density is 1.05 g/cm 3 and whose empirical formula is CH 1.3 . Thus the mass of a typical mandrel is ~0.18 mg, which is 1.4 x 10 -5 moles of CH 1.3 .…”

Section: Modelmentioning

confidence: 99%

Pyrolytic Removal of the Plastic Mandrel from Sputtered Beryllium Shells

Cook

Letts

Buckley

et al. 2006

Fusion Science and Technology

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An engineering model is presented for the removal of the plastic mandrel from the inside of a sputtered Be shell. The removal is accomplished by forcing heated air in and out of the 4 to 5 µm laser drilled fill hole in the capsule wall by cycling the external pressure between 2 and 5 atm. The plastic is combusted to CO 2 and H 2 O by this exposure, thus removing the mandrel. Calculations are presented to evaluate the various parameters in the approach. Experimental confirmation of the effectiveness of the removal is shown.

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The PAMS/GDP Process for Production of ICF Target Mandrels

Cited by 103 publications

References 2 publications

National Ignition Facility target design and fabrication

National Ignition Facility target design and fabrication

Development of TESPEL Configurations for Plasma Diagnostics

Pyrolytic Removal of the Plastic Mandrel from Sputtered Beryllium Shells

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