Development of High Quality Poly(α-Methylstyrene) Mandrels for NIF

Takagi, Masaru; Cook, Robert; McQuillan, B.W.; Elsner, Fred; Stephens, R. B.; Nikroo, A.; Gibson, Jane; Paguio, Sally

doi:10.13182/fst41-278

Cited by 28 publications

(13 citation statements)

References 10 publications

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“…The fabrication of DVB shells was a direct extension of the microencapsulation process of full‐density poly(α‐methylstyrene) (PAMS) shells 3, 4. The shell diameter and shell wall produced were controlled by producing shells with a triple orifice droplet generator 1–8. The shells could be made via the microencapsulation process because the shells were made using a typical water/oil/water microencapsulation system 3, 4.…”

Section: Methodsmentioning

confidence: 99%

“…The shell diameter and shell wall produced were controlled by producing shells with a triple orifice droplet generator 1–8. The shells could be made via the microencapsulation process because the shells were made using a typical water/oil/water microencapsulation system 3, 4. Because this process is similar to the process for producing PAMS shells, we did not make many changes to our current droplet generator design.…”

Section: Methodsmentioning

confidence: 99%

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Fabrication and overcoating of divinylbenzene foam shells using dual initiators

Paguio

Nikroo

Takagi

et al. 2006

J of Applied Polymer Sci

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Divinylbenzene (DVB) shells with a density of about 100 mg/cc were produced using a dual-thermal initiator system. New high-gain designs for direct-drive ignition at the National Ignition Facility and the OMEGA laser facility at the Laboratory for Laser Energetics require lowdensity foam shells such as these. Previous research using a single initiator system produced fragile DVB shells that cracked or imploded during the fabrication process. The dual-initiator DVB system used in the present study enabled the shells to be robust enough to produce a high yield of intact shells. The two thermal initiators used were azobisisobutyronitrile (AIBN) and another azo-type initiator, V-70. The DVB shells were 800 -3500 m in diameter, with shell wall thickness 7%-10% of the diameter. Because the foam shells were porous, a full-density permeation barrier of poly(vinyl phenol) was developed and deposited on the shells using two techniques to enable the shells to retain gas. The initial results show that the permeation barrier was pinhole free and could hold the gas in a gas-filled shell.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fabrication and overcoating of divinylbenzene foam shells using dual initiators

Paguio

Nikroo

Takagi

et al. 2006

J of Applied Polymer Sci

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“…In this case, the smaller TESPEL can contain the lesser amount of the tracer impurity; then we face the problem that the TESPEL for a shallow penetration results in a shortage of the tracer amount for the diagnostics. In order to improve this problem, we developed the TESPEL with the thinner outer shell based on the fabrication technology of a shell type polystyrene (C 8 H 8 ) n polymer [17]. In the case that the outer diameter of the outer shell is about 700 µm, the thickness of the outer shell is about 70 ∼ 80 µm, which is 70% thinner than that with the thick-shell type TESPEL.…”

Section: Various Types Of Tespelsmentioning

confidence: 99%

Creation of Impurity Source inside Plasmas with Various Types of Tracer-Encapsulated Solid Pellet

Tamura

Sudo

Suzuki

et al. 2015

Plasma and Fusion Research

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A Tracer-Encapsulated Solid Pellet (TESPEL) was developed for promoting an impurity transport study in a magnetically-confined plasma. One of the advantages of the TESPEL is that it can make a three-dimensionally localized impurity source in the plasma. This enables us to inject the tracer impurity inside or in the vicinity of the region of interest. Recently, a new-type TESPEL with a thinner outer shell has been developed in order to achieve a shallower deposition of the tracer impurity. With the TESPEL having the thinner shell, we have achieved about 4 cm shallower deposition of the tracer impurity, compared with the case of the conventional thick-shell type TESPEL with the same outer diameter of about 700 µm. Moreover, for the achievement of the further shallower deposition of the tracer impurity, we also developed the TESPEL with a tracer-impurity-doped thin shell. After the injection of the TESPEL with the tracer-impurity-doped thin shell, the line emissions from the highly-ionized doped impurity are clearly observed with a vacuum ultraviolet spectrometer, which clearly demonstrates its ability to carry the impurity as a new tool.

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“…Shigeru SUDO 1,2) , Naoki TAMURA 1) , Chihiro SUZUKI 1) , Hisamichi FUNABA 1,2) , Masaru TAKAGI 3) and Nakahiro SATOH 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.…”

Section: Development Of Tespel Configurations For Plasma Diagnosticsmentioning

confidence: 99%

“…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).…”

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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Development of High Quality Poly(α-Methylstyrene) Mandrels for NIF

Cited by 28 publications

References 10 publications

Fabrication and overcoating of divinylbenzene foam shells using dual initiators

Fabrication and overcoating of divinylbenzene foam shells using dual initiators

Creation of Impurity Source inside Plasmas with Various Types of Tracer-Encapsulated Solid Pellet

Development of TESPEL Configurations for Plasma Diagnostics

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