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The produced protons are characterized by high-energies (with a broad spectrum), are emitted in a very directional manner, and the process is associated to relaxed laser (no need for high-contrast) and target (no need for ultra-thin or expensive targets) constraints. As such, this process appears quite effective compared to the standard and commonly used Target Normal Sheath Acceleration technique (TNSA), or more exploratory mechanisms like Radiation Pressure Acceleration (RPA). The data are underpinned by 3D numerical simulations which suggest that in these conditions a Low Density Collisionless Shock Acceleration (LDCSA) mechanism is at play, which combines an initial Collisionless Shock Acceleration (CSA) to a boost procured by a TNSA-like sheath field in the downward density ramp of the target, leading to an overall broad spectrum. Experiments performed at a laser intensity of 10<jats:sup>20<\/jats:sup>\u2009W\/cm<jats:sup>2<\/jats:sup> show that LDCSA can accelerate, from ~1% critical density, mm-scale targets, up to 5\u2009\u00d7\u200910<jats:sup>9<\/jats:sup> protons\/MeV\/sr\/J with energies up to 45(\u00b15) MeV in a collimated (~6\u00b0 half-angle) manner.<\/jats:p>","DOI":"10.1038\/s41598-017-15449-8","type":"journal-article","created":{"date-parts":[[2017,11,22]],"date-time":"2017-11-22T10:32:05Z","timestamp":1511346725000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Acceleration of collimated 45\u2009MeV protons by collisionless shocks driven in low-density, large-scale gradient plasmas by a 1020\u2009W\/cm2, 1\u2009\u00b5m laser"],"prefix":"10.1038","volume":"7","author":[{"given":"P.","family":"Antici","sequence":"first","affiliation":[]},{"given":"E.","family":"Boella","sequence":"additional","affiliation":[]},{"given":"S. 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