The high-energy photon source(HEPS)is the first fourth-generation synchrotron light source facility in China.The HEPS injector consists of a linear accelerator(Linac)and a full energy booster.The booster captures the ...The high-energy photon source(HEPS)is the first fourth-generation synchrotron light source facility in China.The HEPS injector consists of a linear accelerator(Linac)and a full energy booster.The booster captures the electron beam from the Linac and increases its energy to the value required for the storage ring.The full-energy beam could be injected to the storage ring directly or after“high-energy accumulation.”On November 17,2023,the key booster parameters successfully reached their corresponding target values.These milestone results were achieved based on numerous contributions,including nearly a decade of physical design,years of equipment development and installation,and months of beam commissioning.As measured at the extraction energy of 6 GeV,the averaged beam current and emittance reached 8.57 mA with 5 bunches and 30.37 nm rad with a single-bunch charge of 5.58 nC,compared with the corresponding target values of 6.6 mA and 35 nm rad,respectively.This paper presents the physical design,equipment development,installation,and commissioning process of the HEPS booster.展开更多
Purpose The physics design of the High Energy Photon Source(HEPS)was finished after many times of iteration.Hereby,the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation ...Purpose The physics design of the High Energy Photon Source(HEPS)was finished after many times of iteration.Hereby,the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation modes in the baseline design of HEPS are presented.Methods To compute the equilibrium parameters of the electron beam,the lattice parameters,RF parameters,and the parameters of the insertion devices(IDs)were determined first.Furthermore,it is more precise to use the full-current electron beam parameters in the estimations of the performance of the synchrotron light.Therefore,not only the single-particle dynamics but also the current-dependent collective effects need to be considered in the computations of the full-current,equilibrium parameters of the electron beam.Both analytic computations and multi-particle tracking simulations were carried out.Results The full-current,equilibrium parameters of the electron beams in the HEPS storage ring are presented in this paper.Moreover,the main beam parameters in the injector(the booster and the LINAC),corresponding to the two baseline operation modes of the storage ring,are also presented.Conclusion The typical electron beam parameters corresponding to the two baseline operation modes are given in detail in this paper.展开更多
The paper introduces the synchrotron radiation system for Hefei Light Source (HLS),which includes the streak camera system,the bunch length system using photoelectric method,the beam profile measurement system,and the...The paper introduces the synchrotron radiation system for Hefei Light Source (HLS),which includes the streak camera system,the bunch length system using photoelectric method,the beam profile measurement system,and the photon beam position measurement system.The bunch length and bunch lengthening were measured using the streak camera system and the photoelectric method.The beam profile measurement system was used to observe the suppression effects of sextupole on beam transverse instability and the feedback effects of the transverse bunch-by-bunch feedback system.The photon beam position measurement system used two wire-type monitors and the logarithmic signal processor,which was used to detect the beam motions.展开更多
We try to design the lattice with 2 super periods and 4-DBA structure in order to provide more drifts for the future development of the TTX source. Due to the space limitation in the lab, the 4-DBA lattice is suitable...We try to design the lattice with 2 super periods and 4-DBA structure in order to provide more drifts for the future development of the TTX source. Due to the space limitation in the lab, the 4-DBA lattice is suitable.In the paper,we present the lattice design with a 4-DBA structure mainly for the pulse mode of the compact laser-electron storage ring （LESR）. Element parameters of the lattice are optimized with the help of the professional software and beam dynamics such as intra-beam scattering （IBS） and Compton scattering （CS） are calculated. Besides, the fringe field effect is analyzed with the numerical method.展开更多
This paper discusses the well-known delayed choice Quantum Eraser experiment performed by Kim <em>et al.</em> in 2000 and analyzes it from a Classical Physics perspective. I have included a diagram of the ...This paper discusses the well-known delayed choice Quantum Eraser experiment performed by Kim <em>et al.</em> in 2000 and analyzes it from a Classical Physics perspective. I have included a diagram of the setup used in the experiment. I show that the result of the experiment can be explained by Classical Physics and does not require “Spooky action at a distance” due to entangled particles, as Einstein famously once put it, nor events modifying the past due to the delayed choice aspect of the experiment.展开更多
Aim: Electron, photon or proton beams are used in radiotherapy for cancer treatment while each one may be used depending on depth and the location of tumor and normal tissues around the treatment target as well as eco...Aim: Electron, photon or proton beams are used in radiotherapy for cancer treatment while each one may be used depending on depth and the location of tumor and normal tissues around the treatment target as well as economic issues. Materials and Methods: In this research, dose distribution by proton was measured by film dosimetry in nasal cavity Plexiglas phantom and Monte Carlo simulation. Then the DVH of treatment target and the posterior of treatment target of different beams were compared. The energies of electron, photon and proton were 9 MeV, 6 MV, and maximum 65 MeV, respectively. Due to a depth of 3.5 cm of CTV (Clinical Target Volume), Modulation Range was between 0 - 3.5 cm and SOBP (Spread-out Bragg Peak) was between 0 - 65 MeV. Results: Comparing the obtained DVH values, 95% dose coverage of target volume for electron, photon, proton and Photon-Electron beams were 88%, 98%, 98%, and 95%, respectively. However, doses above 40% that reached outside the target were 50%, 82%, 5%, and 44%, respectively. Conclusions: The results demonstrate the superiority of proton therapy in nasal cancer due to its better target volume coverage and the less amount of the dose reaching outside the target that is because of dose discharge in a small area and significant dose fall-off after Bragg peak.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.12005239).
文摘The high-energy photon source(HEPS)is the first fourth-generation synchrotron light source facility in China.The HEPS injector consists of a linear accelerator(Linac)and a full energy booster.The booster captures the electron beam from the Linac and increases its energy to the value required for the storage ring.The full-energy beam could be injected to the storage ring directly or after“high-energy accumulation.”On November 17,2023,the key booster parameters successfully reached their corresponding target values.These milestone results were achieved based on numerous contributions,including nearly a decade of physical design,years of equipment development and installation,and months of beam commissioning.As measured at the extraction energy of 6 GeV,the averaged beam current and emittance reached 8.57 mA with 5 bunches and 30.37 nm rad with a single-bunch charge of 5.58 nC,compared with the corresponding target values of 6.6 mA and 35 nm rad,respectively.This paper presents the physical design,equipment development,installation,and commissioning process of the HEPS booster.
基金supported by the High Energy Photon Source(HEPS),a major national science and technology infrastructurethe National Natural Science Foundation of China(No.11922512).
文摘Purpose The physics design of the High Energy Photon Source(HEPS)was finished after many times of iteration.Hereby,the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation modes in the baseline design of HEPS are presented.Methods To compute the equilibrium parameters of the electron beam,the lattice parameters,RF parameters,and the parameters of the insertion devices(IDs)were determined first.Furthermore,it is more precise to use the full-current electron beam parameters in the estimations of the performance of the synchrotron light.Therefore,not only the single-particle dynamics but also the current-dependent collective effects need to be considered in the computations of the full-current,equilibrium parameters of the electron beam.Both analytic computations and multi-particle tracking simulations were carried out.Results The full-current,equilibrium parameters of the electron beams in the HEPS storage ring are presented in this paper.Moreover,the main beam parameters in the injector(the booster and the LINAC),corresponding to the two baseline operation modes of the storage ring,are also presented.Conclusion The typical electron beam parameters corresponding to the two baseline operation modes are given in detail in this paper.
文摘The paper introduces the synchrotron radiation system for Hefei Light Source (HLS),which includes the streak camera system,the bunch length system using photoelectric method,the beam profile measurement system,and the photon beam position measurement system.The bunch length and bunch lengthening were measured using the streak camera system and the photoelectric method.The beam profile measurement system was used to observe the suppression effects of sextupole on beam transverse instability and the feedback effects of the transverse bunch-by-bunch feedback system.The photon beam position measurement system used two wire-type monitors and the logarithmic signal processor,which was used to detect the beam motions.
基金Supported by National Natural Science Foundation of China (10735050)National Basic Research Program of China (973 Program)(2007CB815102)
文摘We try to design the lattice with 2 super periods and 4-DBA structure in order to provide more drifts for the future development of the TTX source. Due to the space limitation in the lab, the 4-DBA lattice is suitable.In the paper,we present the lattice design with a 4-DBA structure mainly for the pulse mode of the compact laser-electron storage ring （LESR）. Element parameters of the lattice are optimized with the help of the professional software and beam dynamics such as intra-beam scattering （IBS） and Compton scattering （CS） are calculated. Besides, the fringe field effect is analyzed with the numerical method.
文摘This paper discusses the well-known delayed choice Quantum Eraser experiment performed by Kim <em>et al.</em> in 2000 and analyzes it from a Classical Physics perspective. I have included a diagram of the setup used in the experiment. I show that the result of the experiment can be explained by Classical Physics and does not require “Spooky action at a distance” due to entangled particles, as Einstein famously once put it, nor events modifying the past due to the delayed choice aspect of the experiment.
文摘Aim: Electron, photon or proton beams are used in radiotherapy for cancer treatment while each one may be used depending on depth and the location of tumor and normal tissues around the treatment target as well as economic issues. Materials and Methods: In this research, dose distribution by proton was measured by film dosimetry in nasal cavity Plexiglas phantom and Monte Carlo simulation. Then the DVH of treatment target and the posterior of treatment target of different beams were compared. The energies of electron, photon and proton were 9 MeV, 6 MV, and maximum 65 MeV, respectively. Due to a depth of 3.5 cm of CTV (Clinical Target Volume), Modulation Range was between 0 - 3.5 cm and SOBP (Spread-out Bragg Peak) was between 0 - 65 MeV. Results: Comparing the obtained DVH values, 95% dose coverage of target volume for electron, photon, proton and Photon-Electron beams were 88%, 98%, 98%, and 95%, respectively. However, doses above 40% that reached outside the target were 50%, 82%, 5%, and 44%, respectively. Conclusions: The results demonstrate the superiority of proton therapy in nasal cancer due to its better target volume coverage and the less amount of the dose reaching outside the target that is because of dose discharge in a small area and significant dose fall-off after Bragg peak.
