US 10,368,428 B2
Source for intra-pulse multi-energy X-ray cargo inspection
Aleksandr Saverskiy, North Andover, MA (US)
Assigned to American Science and Engineering, Inc., Billerica, MA (US)
Filed by American Science and Engineering, Inc., Billerica, MA (US)
Filed on Dec. 5, 2017, as Appl. No. 15/832,369.
Application 15/832,369 is a continuation of application No. 15/307,463, granted, now 9,867,271, previously published as PCT/US2015/030716, filed on May 14, 2015.
Claims priority of provisional application 61/994,484, filed on May 16, 2014.
Prior Publication US 2018/0368248 A1, Dec. 20, 2018
This patent is subject to a terminal disclaimer.
Int. Cl. H05G 2/00 (2006.01); H05H 9/04 (2006.01); H05H 7/02 (2006.01); H01J 35/14 (2006.01); H05H 7/08 (2006.01); H01J 35/00 (2006.01); G01V 5/00 (2006.01)
CPC H05H 7/02 (2013.01) [H01J 35/14 (2013.01); H05H 7/08 (2013.01); H05H 9/04 (2013.01); G01V 5/0041 (2013.01); H01J 35/00 (2013.01); H05G 2/00 (2013.01); H05H 2007/025 (2013.01); H05H 2007/084 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for generating a multiple-energy X-ray pulse, the method comprising:
generating a beam of electrons with an electron gun;
modulating the beam of electrons prior to injection into an accelerating structure to achieve at least a first pulse of electrons having a first specified beam current amplitude and a first specified beam current temporal profile, and a second pulse of electrons having a second specified beam current amplitude and a second specified beam current temporal profile, wherein the first pulse of electrons and the second pulse of electrons are each characterized by an electron beam pulse duration;
applying to the accelerating structure a radio frequency field with a specified RF field amplitude and a specified RF temporal profile characterized by an RF pulse duration;
injecting the beam of electrons at the first specified beam current amplitude and then at the second specified beam current amplitude after a specified delay in such a manner as to achieve at least two distinct endpoint energies of electrons accelerated within the accelerating structure during a course of a single RF-pulse, wherein the first specified beam current amplitude is different from the second specified beam current amplitude and wherein the specified delay is a function of a decay time of the accelerating structure;
optimizing a coupling coefficient between an RF source and the accelerating structure so as to achieve zero RF power reflection at a specified beam current;
accelerating the beam of electrons with the radio frequency field within the accelerating structure to produce accelerated electrons; and
impinging the accelerated electrons upon a target for generating X-rays by Bremsstrahlung.