Oxford Centre for High Energy Density Science (OxCHEDS)

Research group

Research theme

Sub department

About

Related research groups

Overview of X-ray laser research in the UK

INST PHYS CONF SER 159 (1999) 1-8

Authors:

CLS Lewis, R Keenan, AG MacPhee, RMN O'Rourke, GJ Tallents, G Eker, JY Lin, SJ Pestehe, R Smith, JS Wark, E Wolfrum, J Zhang, GJ Pert, SP McCabe, PA Simms, RE Burge, MT Browne, P Charalambous, D Neely, J Collier, CN Danson

Abstract:

Developments in collision-pumped X-ray lasers using a variety of pumping configurations made possible by the versatile VULCAN glass laser at the Central Laser Facility are described. Optimised pumping configurations for nickel-like ions in the QSS regime has lead to saturated outputs at wavelengths as low as 5.8 nm and CPA technology has enabled travelling wave pumping in the TCE regime to deliver saturated output at 12.0 nm, from nickel-like tin. New directions, stemming from availability of more intense pumps and brighter XRLs are discussed briefly.
More details

Simulations of femtosecond X-ray diffraction from unperturbed and rapidly heated single crystals

JOURNAL OF APPLIED CRYSTALLOGRAPHY 32 (1999) 692-703

Authors:

JS Wark, RW Lee
More details from the publisher

The Search for Extraterrestrial Intelligence (SETI)

The Irish Astronomical Journal 26 (1999) 87-90

Authors:

FP Keenan, ME Phillips, SJ Rose, DD Burgess

Vertical variant of a double channel-cut crystal spectrometer for investigation of laser-generated plasmas

REVIEW OF SCIENTIFIC INSTRUMENTS 70:7 (1999) 3025-3031

Authors:

O Renner, PK Patel, JS Wark, E Krousky, PE Young, RW Lee
More details from the publisher

X-ray laser radiography of hydrodynamic perturbations due to laser imprint

INST PHYS CONF SER 159 (1999) 657-663

Authors:

E Wolfrum, JS Wark, J Zhang, N O'Rourke, R Keenan, CLS Lewis, AG MacPhee, D Kalantar, MH Key, BA Remington, D Neely, A Djaoui, SJ Rose, G Eker, J Lin, R Smith, GJ Tallents

Abstract:

Extreme ultraviolet (XUV) laser radiography is a technique that allows the investigation of hydrodynamic perturbations with high spatial and temporal resolution. A Ne-like Ge XUV laser with wavelength lambda = 19.6 nm was used as a backlighter for 2 pm thick Al foils, and a Ni-like Sm XUV laser at lambda = 7.3 nm for 2 pm thick CH foils. The imprinted modulation and growth due to a low intensity (I = 5.0(12) to 1.5.10(13) W/cm(2)) 0.53 mu m drive beam incident on the thin foils has been determined. Smoothing techniques were used to minimise the optical perturbations, and the growth rates for the different smoothing schemes are compared. Moreover, single mode perturbation with I = 15, 30, 70 and 90 mu m wavelengths have been investigated to gain better insight into the physical processes of imprinting. XUV laser radiography is also suitable to determine the change in opacity for shock compressed materials. For the investigated conditions, the opacity of Al increases by a factor of 1.4 to 1.6, depending on the drive intensity.
More details