We propose a photon-photon collider based on synchrotron gamma sources driven by relativistic electron beams in hollow plasma channels.The collimated(with a divergence angle of~1 mrad)and ultrabrilliant(>10^(28)pho...We propose a photon-photon collider based on synchrotron gamma sources driven by relativistic electron beams in hollow plasma channels.The collimated(with a divergence angle of~1 mrad)and ultrabrilliant(>10^(28)photons s^(-1)·mrad^(-2)·mm^(-2)per 0.1% bandwidth at 0.6 MeV)photon beams are generated by strong electromagnetic fields induced by current filamentation instability,and up to~10^(6) Breit-Wheeler(BW)pairs can be created per shot.Notably,the usage of hollow plasma channels not only enhances synchrotron radiation,but also allows flexible control of the produced photon beams,ensuring the alignment of the two colliding beams and maximizing the two-photon BW process.This setup has the advantage of a clean background by eliminating the yield from the nonlinear BW process,and the signal-to-noise ratio is higher than 10^(2).展开更多
Direct laser acceleration is one of the mechanisms for producing electron bunches carrying up to μC charge,which has attracted much attention in recent decades.Currently,one major challenge for its applications to hi...Direct laser acceleration is one of the mechanisms for producing electron bunches carrying up to μC charge,which has attracted much attention in recent decades.Currently,one major challenge for its applications to high-flux x-ray beams and Comptonγ-ray sources is the relatively large divergence angle(hundreds of mrad).In this work,a scheme to guide and focus the incident laser and the accelerated electrons is proposed and tested through two-dimensional(2D)particle-in-cell(PIC)simulations.The scheme is based on a hollow cone target(made of aluminum or gold)filled with near-critical-density(NCD)plasmas(pre-ionized polymer foams).Instead of separating the acceleration and focusing processes,it is convenient to simultaneously realize both requirements in such an NCD plasma-filled cone target.PIC simulations reveal that the laser,electrons,and emitted photons can be well-guided along the cone axis in the NCD plasma-filled cone target,preserving the characteristic of high beam charge.Detailed PIC simulations are also performed to show the dependence of the electron energy and charge on the plasma density for a given laser.展开更多
基金supported by the Fund of the National Key Laboratory of Plasma Physics(Grant No.6142A04230204)the National Natural Science Foundation of China(Project No.12075046).
文摘We propose a photon-photon collider based on synchrotron gamma sources driven by relativistic electron beams in hollow plasma channels.The collimated(with a divergence angle of~1 mrad)and ultrabrilliant(>10^(28)photons s^(-1)·mrad^(-2)·mm^(-2)per 0.1% bandwidth at 0.6 MeV)photon beams are generated by strong electromagnetic fields induced by current filamentation instability,and up to~10^(6) Breit-Wheeler(BW)pairs can be created per shot.Notably,the usage of hollow plasma channels not only enhances synchrotron radiation,but also allows flexible control of the produced photon beams,ensuring the alignment of the two colliding beams and maximizing the two-photon BW process.This setup has the advantage of a clean background by eliminating the yield from the nonlinear BW process,and the signal-to-noise ratio is higher than 10^(2).
基金supported by the Fund of the National Key Laboratory of Plasma Physics(Grant No.6142A04230204)the National Natural Science Foundation of China(Grant No.12075046)。
文摘Direct laser acceleration is one of the mechanisms for producing electron bunches carrying up to μC charge,which has attracted much attention in recent decades.Currently,one major challenge for its applications to high-flux x-ray beams and Comptonγ-ray sources is the relatively large divergence angle(hundreds of mrad).In this work,a scheme to guide and focus the incident laser and the accelerated electrons is proposed and tested through two-dimensional(2D)particle-in-cell(PIC)simulations.The scheme is based on a hollow cone target(made of aluminum or gold)filled with near-critical-density(NCD)plasmas(pre-ionized polymer foams).Instead of separating the acceleration and focusing processes,it is convenient to simultaneously realize both requirements in such an NCD plasma-filled cone target.PIC simulations reveal that the laser,electrons,and emitted photons can be well-guided along the cone axis in the NCD plasma-filled cone target,preserving the characteristic of high beam charge.Detailed PIC simulations are also performed to show the dependence of the electron energy and charge on the plasma density for a given laser.
