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DOE OSTI · 2523639

Angularly resolved spectral reconstruction of x rays via filter pack attenuation

Fitzgarrald, Rebecca [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000316338113)·Cardarelli, Jason A. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:000000022060494X)·Campbell, Paul T. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000271920221)·Fourmaux, Sylvain [Université du Québec (INRS-EMT) (Canada)]·Balcazar, Mario D. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000311510316)·Antoine, Andre F. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000308270219)·Beier, Nicholas F. [University of Alberta (Canada)] (ORCID:0000000227234056)·Qian, Qian [University of Michigan, Ann Arbor, MI (United States)] (ORCID:000000016955769X)·Hussein, Amina E. [University of Alberta (Canada)]·Kettle, Brendan [Imperial College London (United Kingdom)] (ORCID:0000000344244448)·Klein, Sallee R. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000337558617)·Krushelnick, Karl [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000191169511)·Li, Y. F. [Chinese Academy of Sciences (CAS), Beijing (China)]·Mangles, Stuart P. D. [Imperial College London (United Kingdom)] (ORCID:0000000324434201)·Sarri, Gianluca [Queen’s University Belfast (United Kingdom)] (ORCID:000000031800343X)·Seipt, Daniel [Helmholtz Institut Jena (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)] (ORCID:0000000336950051)·Senthilkumaran, Vigneshvar [University of Alberta (Canada)] (ORCID:0000000207833828)·Streeter, Matthew J. V. [Queen’s University Belfast (United Kingdom)] (ORCID:0000000190869831)·Thomas, Alexander G. R. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000332068512)·Ma, Yong [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000239194856)
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Abstract

We have designed a new filter pack array to measure angular variations in x-ray spectra during a single shot. The filter pack was composed of repeating identical columns of aluminum and copper filters of varying thicknesses. These columns were located at different positions to measure the spectrum at each corresponding angle. This array was utilized in an experiment to measure the energy evolution of betatron x rays in a laser wakefield accelerator by curving the wakefield with a transverse density gradient, streaking the x rays across the array in front of an x-ray charge-coupled device (CCD) camera. After subtracting the background and “flattening” the image to remove spatial nonuniformities, a critical energy was calculated for each position that produced the best agreement with the measured signal. There was a clear change in critical energy with angle, shedding light on the dynamics of the electrons that traveled through the accelerator. Furthermore, these angles correspond to distinct emission times, covering a timescale of tens of picoseconds. The filter pack was capable of recovering these angular details without the impact of errors introduced by shot-to-shot variability.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY73 NUCLEAR PHYSICS AND RADIATION PHYSICSBetatronCharge coupled devicesEnergy productionFilter packGas jetLaserPhoton absorptionPhoton spectraPlasma accelerationSynchrotronsTransmission and distributionWakefield accelerationX-ray diagnosticsX-ray spectraX-ray spectroscopyplasma

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Fitzgarrald, Rebecca [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000316338113), Cardarelli, Jason A. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:000000022060494X), Campbell, Paul T. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000271920221), Fourmaux, Sylvain [Université du Québec (INRS-EMT) (Canada)], Balcazar, Mario D. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000311510316), Antoine, Andre F. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000308270219), Beier, Nicholas F. [University of Alberta (Canada)] (ORCID:0000000227234056), Qian, Qian [University of Michigan, Ann Arbor, MI (United States)] (ORCID:000000016955769X), Hussein, Amina E. [University of Alberta (Canada)], Kettle, Brendan [Imperial College London (United Kingdom)] (ORCID:0000000344244448), Klein, Sallee R. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000337558617), Krushelnick, Karl [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000191169511), Li, Y. F. [Chinese Academy of Sciences (CAS), Beijing (China)], Mangles, Stuart P. D. [Imperial College London (United Kingdom)] (ORCID:0000000324434201), Sarri, Gianluca [Queen’s University Belfast (United Kingdom)] (ORCID:000000031800343X), Seipt, Daniel [Helmholtz Institut Jena (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)] (ORCID:0000000336950051), Senthilkumaran, Vigneshvar [University of Alberta (Canada)] (ORCID:0000000207833828), Streeter, Matthew J. V. [Queen’s University Belfast (United Kingdom)] (ORCID:0000000190869831), Thomas, Alexander G. R. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000332068512), Ma, Yong [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000239194856). 2025-02-26. Angularly resolved spectral reconstruction of x rays via filter pack attenuation. https://doi.org/10.1063/5.0248972

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