Hai-En Tsai

All Publications

• Reduced bandwidth Compton photons from a laser-plasma accelerator using tailored plasma channels PHYSICS OF PLASMAS Grote, D. P., Friedman, A., Geddes, C. R., Lehe, R., Benedetti, C., Ostermayr, T. M., Tsai, H., Vay, J., Schroeder, C. B., Esarey, E. 2021; 28 (12)

  View details for DOI 10.1063/5.0073622

  View details for Web of Science ID 000730516400002

• High-power non-perturbative laser delivery diagnostics at the final focus of 100-TW-class laser pulses HIGH POWER LASER SCIENCE AND ENGINEERING Isono, F., van Tilborg, J., Barber, S. K., Natal, J., Berger, C., Tsai, H., Ostermayr, T., Gonsalves, A., Geddes, C., Esarey, E. 2021; 9

  View details for DOI 10.1017/hpl.2021.12

  View details for Web of Science ID 000656379900001

• Gas density structure of supersonic flows impinged on by thin blades for laser-plasma accelerator targets PHYSICS OF FLUIDS Fan-Chiang, L., Mao, H., Tsai, H., Ostermayr, T., Swanson, K. K., Barber, S. K., Steinke, S., van Tilborg, J., Geddes, C. R., Leemans, W. P. 2020; 32 (6)

  View details for DOI 10.1063/5.0005888

  View details for Web of Science ID 000546939300001

• Parametric emittance measurements of electron beams produced by a laser plasma accelerator PLASMA PHYSICS AND CONTROLLED FUSION Barber, S. K., van Tilborg, J., Schroeder, C. B., Lehe, R., Tsai, H., Swanson, K. K., Steinke, S., Nakamura, K., Geddes, C. R., Benedetti, C., Esarey, E., Leemans, W. P. 2018; 60 (5)

  View details for DOI 10.1088/1361-6587/aab6cd

  View details for Web of Science ID 000429209400002

• Comparative study of active plasma lenses in high-quality electron accelerator transport lines van Tilborg, J., Barber, S. K., Benedetti, C., Schroeder, C. B., Isono, F., Tsai, H., Geddes, C. R., Leemans, W. P. AMER INST PHYSICS. 2018

  View details for DOI 10.1063/1.5018001

  View details for Web of Science ID 000433961800153

• Control of quasi-monoenergetic electron beams from laser-plasma accelerators with adjustable shock density profile PHYSICS OF PLASMAS Tsai, H., Swanson, K. K., Barber, S. K., Lehe, R., Mao, H., Mittelberger, D. E., Steinke, S., Nakamura, K., van Tilborg, J., Schroeder, C., Esarey, E., Geddes, C. R., Leemans, W. 2018; 25 (4)

  View details for DOI 10.1063/1.5023694

  View details for Web of Science ID 000431142200053

• A tabletop, ultrashort pulse photoneutron source driven by electrons from laser wakefield acceleration MATTER AND RADIATION AT EXTREMES Jiao, X. J., Shaw, J. M., Wang, T., Wang, X. M., Tsai, H., Poth, P., Pomerantz, I., Labun, L. A., Toncian, T., Downer, M. C., Hegelich, B. M. 2017; 2 (6): 296-302

  View details for DOI 10.1016/j.mre.2017.10.003

  View details for Web of Science ID 000447471100004

• Measured Emittance Dependence on the Injection Method in Laser Plasma Accelerators PHYSICAL REVIEW LETTERS Barber, S. K., van Tilborg, J., Schroeder, C. B., Lehe, R., Tsai, H., Swanson, K. K., Steinke, S., Nakamura, K., Geddes, C. R., Benedetti, C., Esarey, E., Leemans, W. P. 2017; 119 (10): 104801

  Abstract

  Single-shot, charge-dependent emittance measurements of electron beams generated by a laser plasma accelerator (LPA) reveal that shock-induced density down-ramp injection produces beams with normalized emittances a factor of 2 smaller than beams produced via ionization injection. Such a comparison is made possible by the tunable LPA setup, which allows electron beams with nearly identical central energy and peak spectral charge density to be produced using the two distinct injection mechanisms. Parametric measurements of this type are essential for the development of LPA-based applications which ultimately require high charge density and low emittance.

  View details for DOI 10.1103/PhysRevLett.119.104801

  View details for Web of Science ID 000409265000004

  View details for PubMedID 28949165

• Control of tunable, monoenergetic laser-plasma-accelerated electron beams using a shock-induced density downramp injector PHYSICAL REVIEW ACCELERATORS AND BEAMS Swanson, K. K., Tsai, H., Barber, S. K., Lehe, R., Mao, H., Steinke, S., van Tilborg, J., Nakamura, K., Geddes, C. R., Schroeder, C. B., Esarey, E., Leemans, W. P. 2017; 20 (5)

  View details for DOI 10.1103/PhysRevAccelBeams.20.051301

  View details for Web of Science ID 000440464800001

• Self-aligning concave relativistic plasma mirror with adjustable focus PHYSICS OF PLASMAS Tsai, H., Arefiev, A. V., Shaw, J. M., Stark, D. J., Wang, X., Zgadzaj, R., Downer, M. C. 2017; 24 (1)

  View details for DOI 10.1063/1.4973432

  View details for Web of Science ID 000395395100055

• Generation of Tens-of-MeV Photons by Compton Backscatter from Laser-Plasma-Accelerated GeV Electrons Shaw, J. M., Bernstein, A. C., Hannasch, A., LaBerge, M., Chang, Y., Weichman, K., Welch, J., Zgadzaj, R., Henderson, W., Tsai, H., Fazel, N., Wang, X., Wagner, C., Donovan, M., Dyer, G., Gaul, E., Gordon, J., Martinez, M., Spinks, M., Toncian, T., Ditmire, T., Downer, M. C., AIP, Gold, S. H., Nusinovich, G. S., Wootton, K. P. AMER INST PHYSICS. 2017

  View details for DOI 10.1063/1.4975910

  View details for Web of Science ID 000403065000074

• Compact Tunable Compton X-ray Source from Laser Wakefield Accelerator and Plasma Mirror Tsai, H., Wang, X., Shaw, J., Arefiev, A. V., Li, Z., Zhang, X., Zgadzaj, R., Henderson, W., Khudik, V., Shvets, G., Downer, M. C., Hogan, M. J. AMER INST PHYSICS. 2016

  View details for DOI 10.1063/1.4965663

  View details for Web of Science ID 000389510300074

• Single-Shot Visualization of Evolving Plasma Wakefields Li, Z., Tsai, H., Zhang, X., Pai, C., Chang, Y., Zgadzaj, R., Wang, X., Khudik, V., Shvets, G., Downer, M. C., Hogan, M. J. AMER INST PHYSICS. 2016

  View details for DOI 10.1063/1.4965612

  View details for Web of Science ID 000389510300023

• Compact tunable Compton x-ray source from laser-plasma accelerator and plasma mirror PHYSICS OF PLASMAS Tsai, H., Wang, X., Shaw, J. M., Li, Z., Arefiev, A. V., Zhang, X., Zgadzaj, R., Henderson, W., Khudik, V., Shvets, G., Downer, M. C. 2015; 22 (2)

  View details for DOI 10.1063/1.4907655

  View details for Web of Science ID 000350552000100

• Single-Shot Visualization of Evolving Laser Wakefields Using an All-Optical Streak Camera PHYSICAL REVIEW LETTERS Li, Z., Tsai, H., Zhang, X., Pai, C., Chang, Y., Zgadzaj, R., Wang, X., Khudik, V., Shvets, G., Downer, M. C. 2014; 113 (8): 085001

  Abstract

  We visualize ps-time-scale evolution of an electron density bubble--a wake structure created in atmospheric density plasma by an intense ultrashort laser pulse--from the phase "streak" that the bubble imprints onto a probe pulse that crosses its path obliquely. Phase streaks, recovered in one shot using frequency-domain interferometric techniques, reveal the formation, propagation, and coalescence of the bubble within a 3 mm long ionized helium gas target. 3D particle-in-cell simulations validate the observed density-dependent bubble evolution, and correlate it with the generation of a quasimonoenergetic ∼ 100 MeV electron beam. The results provide a basis for understanding optimized electron acceleration at a plasma density n(e) ≈ 2 × 10(19) cm(-3), inefficient acceleration at lower density, and dephasing limits at higher density.

  View details for DOI 10.1103/PhysRevLett.113.085001

  View details for Web of Science ID 000341247600005

  View details for PubMedID 25192102

• Quasi-monoenergetic laser-plasma acceleration of electrons to 2 GeV NATURE COMMUNICATIONS Wang, X., Zgadzaj, R., Fazel, N., Li, Z., Yi, S. A., Zhang, X., Henderson, W., Chang, Y., Korzekwa, R., Tsai, H., Pai, C., Quevedo, H., Dyer, G., Gaul, E., Martinez, M., Bernstein, A. C., Borger, T., Spinks, M., Donovan, M., Khudik, V., Shvets, G., Ditmire, T., Downer, M. C. 2013; 4: 1988

  Abstract

  Laser-plasma accelerators of only a centimetre's length have produced nearly monoenergetic electron bunches with energy as high as 1 GeV. Scaling these compact accelerators to multi-gigaelectronvolt energy would open the prospect of building X-ray free-electron lasers and linear colliders hundreds of times smaller than conventional facilities, but the 1 GeV barrier has so far proven insurmountable. Here, by applying new petawatt laser technology, we produce electron bunches with a spectrum prominently peaked at 2 GeV with only a few per cent energy spread and unprecedented sub-milliradian divergence. Petawatt pulses inject ambient plasma electrons into the laser-driven accelerator at much lower density than was previously possible, thereby overcoming the principal physical barriers to multi-gigaelectronvolt acceleration: dephasing between laser-driven wake and accelerating electrons and laser pulse erosion. Simulations indicate that with improvements in the laser-pulse focus quality, acceleration to nearly 10 GeV should be possible with the available pulse energy.

  View details for DOI 10.1038/ncomms2988

  View details for Web of Science ID 000323624600011

  View details for PubMedID 23756359

  View details for PubMedCentralID PMC3709475

• Self-injected petawatt laser-driven plasma electron acceleration in 10(17) cm(-3) plasma JOURNAL OF PLASMA PHYSICS Wang, X., Zgadzaj, R., Yi, S. A., Khudik, V., Henderson, W., Fazel, N., Chang, Y., Korzekwa, R., Tsai, H., Pai, C., Li, Z., Gaul, E., Martinez, M., Dyer, G., Quevedo, H., Bernstein, A., Donovan, M., Shvets, G., Ditmire, T., Downer, M. C. 2012; 78: 413-419

  View details for DOI 10.1017/S002237781200030X

  View details for Web of Science ID 000308671900013

• Global Optimization of Quasi-Monoenergetic Electron Beams from Laser Wakefield Accelerators Tsai, H., Pai, C., Downer, M. C., Zgadzaj, R., Gaul, E., Downer, M. C. AMER INST PHYSICS. 2012: 330-335

  View details for DOI 10.1063/1.4773717

  View details for Web of Science ID 000315058700041

• Petawatt-laser-driven wakefield acceleration of electrons to 2 GeV in 10(17)cm(-3) plasma Wang, X., Zgadzaj, R., Fazel, N., Yi, S. A., Zhang, X., Henderson, W., Chang, Y., Korzekwa, R., Tsai, H., Pai, C., Li, Z., Quevedo, H., Dyer, G., Gaul, E., Martinez, M., Bernstein, A., Borger, T., Spinks, M., Donovan, M., Kalmykov, S. Y., Khudik, V., Shvets, G., Ditmire, T., Downer, M. C., Zgadzaj, R., Gaul, E., Downer, M. C. AMER INST PHYSICS. 2012: 341-344

  View details for DOI 10.1063/1.4773719

  View details for Web of Science ID 000315058700043

• Characterization and control of plasma density distribution for the development of solid-target x-ray lasers PHYSICAL REVIEW E Chou, M. C., Lin, P. H., Tsai, H. E., Chen, D. L., Lee, C. H., Lin, J. Y., Wang, J., Chen, S. Y. 2005; 72 (2): 026407

  Abstract

  By using deflectometry of a longitudinal probe pulse and reflective interferometry of a transverse probe pulse to resolve the spatiotemporal distribution of the preformed plasma, we characterize and control the plasma density distribution near the target surface for the development of solid-target x-ray lasers. We show that the use of prepulses in an ignitor-heater scheme can increase the scale length of the preformed plasma and how the effect varies with target materials. Many important issues crucial to x-ray lasing such as electron density distribution, electron temperature, and the optimal timing between pumping pulses can be resolved with these methods.

  View details for DOI 10.1103/PhysRevE.72.026407

  View details for Web of Science ID 000231564100095

  View details for PubMedID 16196718

• Collisional excitation soft x-ray laser pumped by optical field ionization in a cluster jet PHYSICAL REVIEW A Chu, H. H., Tsai, H. E., Chou, M. C., Yang, L. S., Lin, J. Y., Lee, C. H., Wang, J., Chen, S. Y. 2005; 71 (6)

  View details for DOI 10.1103/PhysRevA.71.061804

  View details for Web of Science ID 000230275200026

• Control of laser-beam propagation and absorption in a nanoplasma gas by programming of a transient complex refractive index with a prepulse PHYSICAL REVIEW E Chu, H. E., Tsai, H. E., Xiao, Y. F., Lee, C. H., Lin, J. Y., Wang, J., Chen, S. Y. 2004; 69 (3): 035403

  Abstract

  By utilizing the intensity- and duration-dependent heating and expansion rate of nanoplasma to generate a transient transverse gradient of the refractive index, prepulse controlled laser-beam propagation is demonstrated. The dynamical response of the macroscopic optical refractive index is traced back to the microscopic polarizability of nanoplasmas experimentally, in accordance with hydrodynamic nanoplasma models. In particular, the delay between the prepulse and the main pulse for maximum Rayleigh scattering is found to be longer than that for maximum x-ray emission, supporting the more refined one-dimensional self-consistent hydrodynamic nanoplasma model.

  View details for DOI 10.1103/PhysRevE.69.035403

  View details for Web of Science ID 000220729400009

  View details for PubMedID 15089352