# The effect of load thickness on Rayleigh-Taylor mitigation in high velocity, annular z pinch implosion

## Abstract

Numerical calculations have been performed to investigate the role that load thickness may play in the performance of fast annular z pinch implosions. In particular, the effects of load thickness on the mitigation of the magnetically-driven Rayleigh-Taylor (RT) instability and energy coupling between the load and generator are addressed. using parameters representative of the Z accelerator [R.B.Spielman et al., Phys.Plasmas, 5, 2105 (1998)] at Sandia National Laboratories, two dimensional magnetohydrodynamic (MHD) simulations show that increased shell thickness results in lower amplitude, slightly longer wavelength RT modes. In addition, there appears to be an optimum in load velocity which is directly associated with the thickness of the sheath and subsequent RT growth. Thin, annular loads, which should couple efficiently to the accelerator, show a large reduction in implosion velocity due to extreme RT development and increased load inductance. As a consequence, thicker loads on the order of 5 mm, couple almost as efficiently to the generator since the RT growth is reduced. This suggests that z-pinch loads can be tailored for different applications, depending on the need for uniformity or high powers.

- Authors:

- Publication Date:

- Research Org.:
- Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)

- Sponsoring Org.:
- US Department of Energy (US)

- OSTI Identifier:
- 755609

- Report Number(s):
- SAND2000-1227J

TRN: US0003775

- DOE Contract Number:
- AC04-94AL85000

- Resource Type:
- Journal Article

- Journal Name:
- Physics of Plasmas

- Additional Journal Information:
- Other Information: Submitted to Physics of Plasmas; PBD: 16 May 2000

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA SIMULATION; RAYLEIGH-TAYLOR INSTABILITY; LONGITUDINAL PINCH; IMPLOSIONS; THICKNESS; INSTABILITY GROWTH RATES

### Citation Formats

```
DOUGLAS,MELISSA R., DEENEY,CHRISTOPHER, and RODERICK,NORMAN F.
```*The effect of load thickness on Rayleigh-Taylor mitigation in high velocity, annular z pinch implosion*. United States: N. p., 2000.
Web.

```
DOUGLAS,MELISSA R., DEENEY,CHRISTOPHER, & RODERICK,NORMAN F.
```*The effect of load thickness on Rayleigh-Taylor mitigation in high velocity, annular z pinch implosion*. United States.

```
DOUGLAS,MELISSA R., DEENEY,CHRISTOPHER, and RODERICK,NORMAN F. Tue .
"The effect of load thickness on Rayleigh-Taylor mitigation in high velocity, annular z pinch implosion". United States. https://www.osti.gov/servlets/purl/755609.
```

```
@article{osti_755609,
```

title = {The effect of load thickness on Rayleigh-Taylor mitigation in high velocity, annular z pinch implosion},

author = {DOUGLAS,MELISSA R. and DEENEY,CHRISTOPHER and RODERICK,NORMAN F.},

abstractNote = {Numerical calculations have been performed to investigate the role that load thickness may play in the performance of fast annular z pinch implosions. In particular, the effects of load thickness on the mitigation of the magnetically-driven Rayleigh-Taylor (RT) instability and energy coupling between the load and generator are addressed. using parameters representative of the Z accelerator [R.B.Spielman et al., Phys.Plasmas, 5, 2105 (1998)] at Sandia National Laboratories, two dimensional magnetohydrodynamic (MHD) simulations show that increased shell thickness results in lower amplitude, slightly longer wavelength RT modes. In addition, there appears to be an optimum in load velocity which is directly associated with the thickness of the sheath and subsequent RT growth. Thin, annular loads, which should couple efficiently to the accelerator, show a large reduction in implosion velocity due to extreme RT development and increased load inductance. As a consequence, thicker loads on the order of 5 mm, couple almost as efficiently to the generator since the RT growth is reduced. This suggests that z-pinch loads can be tailored for different applications, depending on the need for uniformity or high powers.},

doi = {},

journal = {Physics of Plasmas},

number = ,

volume = ,

place = {United States},

year = {2000},

month = {5}

}