title: Macroscopic transport of mega-ampere electron currents in aligned carbon-nanotube arrays.
abstract: We demonstrate that aligned carbon-nanotube arrays are efficient transporters of laser-generated mega-ampere electron currents over distances as large as a millimeter. A direct polarimetric measurement of the temporal and the spatial evolution of the megagauss magnetic fields (as high as 120 MG) at the target rear at an intensity of (10(18)-10(19))  W/cm2 was corroborated by the rear-side hot electron spectra. Simulations show that such high magnetic flux densities can only be generated by a very well collimated fast electron bunch.
authors.affiliation: Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India.
authors.forename: Gourab
authors.initials: G
authors.lastname: Chatterjee
authors.forename: Prashant Kumar
authors.initials: PK
authors.lastname: Singh
authors.forename: Saima
authors.initials: S
authors.lastname: Ahmed
authors.forename: A P L
authors.initials: AP
authors.lastname: Robinson
authors.forename: Amit D
authors.initials: AD
authors.lastname: Lad
authors.forename: Sudipta
authors.initials: S
authors.lastname: Mondal
authors.forename: V
authors.initials: V
authors.lastname: Narayanan
authors.forename: Iti
authors.initials: I
authors.lastname: Srivastava
authors.forename: Nikhil
authors.initials: N
authors.lastname: Koratkar
authors.forename: John
authors.initials: J
authors.lastname: Pasley
authors.forename: A K
authors.initials: AK
authors.lastname: Sood
authors.forename: G Ravindra
authors.initials: GR
authors.lastname: Kumar