Optimization of Kα bursts for photon energies between 1.7 and 7 keV produced by femtosecond-laser-produced plasmas of different scale length

Ziener, C.; Uschmann, I.; Stobrawa, G.; Reich, Ch.; Gibbon, Paul; Feurer, Thomas; Morak, A.; Düsterer, S.; Schwoerer, H.; Förster, E.; Sauerbrey, R.

doi:10.1103/physreve.65.066411

Cited by 39 publications

(5 citation statements)

References 28 publications

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“…In our study, the x-ray spectrum was recorded with a time integrated x-ray spectrograph. The observed x-ray spectrum corresponds to the time and space averaged values of density and temperature of the plasma undergoing rapid hydrodynamic evolution [40,41]. Modelling the x-ray spectrum at each distinct condition of temperature and density, in space and time, would require sophisticated computer simulations coupled to plasma hydrodynamic codes including radiation transport.…”

Section: Discussion Of the Observed X-ray Spectrummentioning

confidence: 99%

A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma

Arora¹,

Naik²,

Chakravarty³

et al. 2014

Phys. Scr.

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The inner-shell radiation (K-α) and the ionic line radiation (He-α) from magnesium plasma, generated by the interaction of a 3 TW, 45 fs laser, have been studied simultaneously using an x-ray crystal spectrograph. The effect of the variation of the laser intensity and its offset from the best focus position has been studied. He-α and K-α x-ray yields are found to scale with the laser intensity as IL1.5 and IL0.6 respectively. The K-α x-ray conversion shows a maximum at the best focus and reduces symmetrically on either side of the best focus position, whereas the He-α conversion peaks when the target is placed before the focused laser beam. The angular distribution for the He-α as well as the K-α emissions shows a maximum in the forward direction and the intensity reduces with the increase in angle θ with respect to the target normal as cosα θ. The value of α is 0.7 and 3 for He-α and K-α respectively. The experimentally observed variation of the He-α line conversion for different laser parameters has been explained by considering the change in preformed plasma conditions, and the variation in the K-α emission has been explained by considering hot electron generation and their propagation in the bulk solid target. The plasma conditions prevalent during the emission of the x-ray spectrum were identified by comparing the experimental spectra with the synthetic spectra generated using the spectroscopic analysis code PrismSPECT. The results will be useful in designing laser-produced plasma x-ray line radiation sources of photon energy in the range of 1–2 keV, for its potential use as a probe pulse in x-ray backlighting, or time-resolved x-ray diffraction studies.

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Section: Discussion Of the Observed X-ray Spectrummentioning

confidence: 99%

A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma

Arora¹,

Naik²,

Chakravarty³

et al. 2014

Phys. Scr.

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“…Reports of previous experiments on the pre-pulse effects on X-ray generation show that 20-to 30-fold enhancement in Al K-shell (~ 1 keV) emissions was achieved with a longer delay time of > 1 ns [Nakano and Liesugi, 2001]. With delay times of tens to hundreds of picoseconds, less than a 10-time enhancement of the K-shell emission was observed with different targets (Si, Ti, Co, and Cu) [Ziener et al, 2002; Eder et al, 2000]. For the Cu K-α emission, a one-order enhancement was predicted in simulations; however, in experiments only four-to five-order enhancements were found [Gibbon et al, 2009].…”

Section: Impact Of Artificial Prepulse On X-ray Yield From Cu Targetmentioning

confidence: 99%

“…Dependence of total and Kα X-ray yields on the delay time ((a) [Ziener et al, 2002;Eder et al, 2000]. For the Cu K-α emission, a one-order enhancement was predicted in simulations; however, in experiments only four-to five-order enhancements were found [Gibbon et al, 2009].…”

Section: Impact Of Artificial Prepulse On X-ray Yield From Cu Targetmentioning

confidence: 99%

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Goss¹

2013

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2. REPORT TYPE 3. DATES COVERED (From -To) AFRL/RQTC SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RQ-WP-TR-2013-0189 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESReport contains color. PA Case Number: 88ABW-2013-5333; Clearance Date: 17 Dec 2013. On many of the papers, the U.S. Government is joint author and has the right to use, modify, reproduce, release, perform, display, or disclose the work. ABSTRACTThis report describes the results of experimental and numerical investigations on the development of extreme-light diagnostics. The purpose of this program was to develop extreme-light diagnostic tools that could be utilized in the future for exploring new frontiers of aerospace science and performing in-place nondestructive evaluation and inspections of newly manufactured and fielded weaponssystems components. The objectives of this research program were realized through an extensive experimental campaign that utilized ultrafast and ultraintense laser systems for the development of advanced sources of secondary emission for nondestructive evaluation. The secondary sources were to include X-rays, energetic electrons, neutrons, and protons. At the crux of the work was the fundamental interaction between an incident, ultrafast, ultraintense laser pulse and a material target. A variety of target materials was explored in this work, and much of the effort was spent on fundamental studies. The results of these studies will serve to guide engineering efforts in establishing these sources for future Air Force applications. Most of the effort was directed toward the development of hard X-ray sources using both metal and liquid targets.The following titles, which have been published in professional journals and conference proceedings or are unpublished reports/presentations, are provided in this report:  "Efficiency and scaling of an ultrashort-pulse high-repetition-rate laser-driven X-ray source"  "An Evaluation of fs/ns-LIBS for Measuring Total Particulate Emissions"  "Picosecond Laser Machining of Shaped Holes In Thermal Barrier Coated Turbine Blades"  "Doub...

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“…Due to collisionless interactions [29][30][31][32][33][34][35][36][37] (resonance absorption and/or vacuum heating) between the created plasma and the laser pulse, a fraction of the plasma electrons is accelerated to kinetic energies of several tens of keV, much higher than the thermal energy of the rest of the plasma electrons (several hundreds of eV) 38 . These "hot" electrons generate Bremsstrahlung and characteristic line emission very similar to a conventional X-ray tube by penetrating into the cold solid underneath the plasma layer.…”

Section: Introductionmentioning

confidence: 99%

“…due to imperfect stretching and recompression of the laser pulses in the typically used chirped-pulse-amplification -CPA -laser systems or due to pre-pulses and/or amplified spontaneous emission -ASE) plasma formation and expansion occur well before the pulse maximum. In some cases 35,36,51,52 "passive" optimization of X-ray production has been achieved through the inherent time structure of the given drive laser.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved diffraction with an optimized short pulse laser plasma X-ray source

Afshari

Krumey

Menn

et al. 2020

Structural Dynamics

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We present a set-up for time-resolved X-ray diffraction based on a short pulse, laser-driven plasma X-ray source. The employed modular design provides high flexibility to adapt the set-up to the specific requirements (e.g. X-ray optics, sample environment) of particular applications. The configuration discussed here has been optimized towards high angular/momentum resolution and uses K α -radiation (4.51 keV) from a Ti wire-target in combination with a toroidally bent crystal for collection, monochromatization and focusing of the emitted radiation. 2 × 10 5 Ti-K α1 photons per pulse with 10 −4 relative bandwidth are delivered to the sample at 10 Hz repetition rate. This allows for high dynamic range (10 4 ) measurements of transient changes of the rocking curves of materials as for example induced by laser-triggered strain waves. PACS numbers: 78.47.J-, 61.05.C, 63.30.dd a) Klaus.Sokolowski-Tinten@uni-due.de

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Optimization of Kα bursts for photon energies between 1.7 and 7 keV produced by femtosecond-laser-produced plasmas of different scale length

Cited by 39 publications

References 28 publications

A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma

A comparative study of the inner-shell and the ionic line radiation from ultra-short laser-produced magnesium plasma

Application of Advanced Laser Diagnostics to High-Impact Technologies: Science and Applications of Ultrafast, Ultraintense Lasers

Time-resolved diffraction with an optimized short pulse laser plasma X-ray source

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