2006 Vol. 30, No. S1
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Abstract:
A survey and critique of the many different “Advanced Particle Acceleration Concepts”is presented in this paper.
A survey and critique of the many different “Advanced Particle Acceleration Concepts”is presented in this paper.
Abstract:
Gravitational instability of the distribution of stars in a galaxy is a well-known phenomenon in astrophysics. This work is a preliminary attempt to analyze this phenomenon using the standard tools developed in accelerator physics. By applying this analysis, it is found that a stable nonrotating galaxy would become unstable if its size exceeds a certain limit that depends on its mass density.
Gravitational instability of the distribution of stars in a galaxy is a well-known phenomenon in astrophysics. This work is a preliminary attempt to analyze this phenomenon using the standard tools developed in accelerator physics. By applying this analysis, it is found that a stable nonrotating galaxy would become unstable if its size exceeds a certain limit that depends on its mass density.
Abstract:
The research activities for accelerator structures at SLAC are reviewed including the achievement via the main linac design for the Next Linear Collider (NLC), the program adjustment after the decision of the International Linear Collider (ILC) to be based on superconducting technology, and the work progress for the ILC, photon science at SLAC and basic accelerator structure studies.
The research activities for accelerator structures at SLAC are reviewed including the achievement via the main linac design for the Next Linear Collider (NLC), the program adjustment after the decision of the International Linear Collider (ILC) to be based on superconducting technology, and the work progress for the ILC, photon science at SLAC and basic accelerator structure studies.
Abstract:
A new Separated Function RFQ (SFRFQ) accelerating structure has been proposed and studied. The paper summarizes the study results, concerning the accelerating efficiency, reversed field, cavity and ion beam performance.
A new Separated Function RFQ (SFRFQ) accelerating structure has been proposed and studied. The paper summarizes the study results, concerning the accelerating efficiency, reversed field, cavity and ion beam performance.
Abstract:
As the beam envelope mismatch is the major source of the halo formation and the related emittance growth in high intensity linac, some extensions based on the four-step method are developed, and the causes of beam mismatch in RFQ are analyzed and a matching dynamics method is proposed to minimize the emittance growth and the related beam loss. A dynamics example is given to prove this design method.
As the beam envelope mismatch is the major source of the halo formation and the related emittance growth in high intensity linac, some extensions based on the four-step method are developed, and the causes of beam mismatch in RFQ are analyzed and a matching dynamics method is proposed to minimize the emittance growth and the related beam loss. A dynamics example is given to prove this design method.
Abstract:
The longitudinal coupling impedance of the injection section for the SSRF is analyzed in this paper. The main contributions are coated ceramic chambers and the injection tapers. They are treated with the analysis method and numerical method,respectively. The broad band impedance as well as the narrow band impedance of the cavity like structure, which is formed by the two adjacent tapers is calculated. No trapped mode has been found.The broad band impedance is expressed in terms of effective broad band impedance, which is more convenient for microwave instability analysis.
The longitudinal coupling impedance of the injection section for the SSRF is analyzed in this paper. The main contributions are coated ceramic chambers and the injection tapers. They are treated with the analysis method and numerical method,respectively. The broad band impedance as well as the narrow band impedance of the cavity like structure, which is formed by the two adjacent tapers is calculated. No trapped mode has been found.The broad band impedance is expressed in terms of effective broad band impedance, which is more convenient for microwave instability analysis.
Abstract:
To calculate the beam transport in the ion optical systems accurately, a beam dynamics computer program of the third order approximation has been developed. Many conventional optical elements have been incorporated in the program. Particle distributions of uniform type or Gaussian type in the 3D dimensional ellipses can be selected by the users. The optimization procedures are provided to make the calculations reasonable and fast. The calculated results can be graphically displayed.
To calculate the beam transport in the ion optical systems accurately, a beam dynamics computer program of the third order approximation has been developed. Many conventional optical elements have been incorporated in the program. Particle distributions of uniform type or Gaussian type in the 3D dimensional ellipses can be selected by the users. The optimization procedures are provided to make the calculations reasonable and fast. The calculated results can be graphically displayed.
Abstract:
This paper investigates long wavelength radiation from the electron beams passing through Optic Klystron. First, a set of formulas is given to compute the long wavelength radiation by Optic Klystron. Next, the quantities of the formulas are testified by a program based on the basic electron dynamic theory. At the end of the paper, the flux per unit solid angle and the flux of long wavelength radiation, which are from bending magnet and Optic Klystron, respectively,are compared. The result shows that for the radiation in the infrared region, Optic Klystron is superior to bending magnet. This paper shows that the Optic Klystron in the National Synchrotron Radiation Laboratory, which is used for the coherent harmonic generation FEL, can be used as a high brilliance infrared source as well.
This paper investigates long wavelength radiation from the electron beams passing through Optic Klystron. First, a set of formulas is given to compute the long wavelength radiation by Optic Klystron. Next, the quantities of the formulas are testified by a program based on the basic electron dynamic theory. At the end of the paper, the flux per unit solid angle and the flux of long wavelength radiation, which are from bending magnet and Optic Klystron, respectively,are compared. The result shows that for the radiation in the infrared region, Optic Klystron is superior to bending magnet. This paper shows that the Optic Klystron in the National Synchrotron Radiation Laboratory, which is used for the coherent harmonic generation FEL, can be used as a high brilliance infrared source as well.
Abstract:
With the Monte Carlo method, the performance of X-ray source of a flash X-ray radiographic machine is simulated. It is not true that the smaller the beam radius and the emittance, the better the performance of radiographic image. The results indicate that there is a joint restriction on the beam radius and the beam emittance. If the beam radius on the target is 0.12cm and the exposure inhomogeneity within the azimuthal angle of 2°is not lager than five percentage, the normalized emittance of the beam should not be less than 550cm.mrad.
With the Monte Carlo method, the performance of X-ray source of a flash X-ray radiographic machine is simulated. It is not true that the smaller the beam radius and the emittance, the better the performance of radiographic image. The results indicate that there is a joint restriction on the beam radius and the beam emittance. If the beam radius on the target is 0.12cm and the exposure inhomogeneity within the azimuthal angle of 2°is not lager than five percentage, the normalized emittance of the beam should not be less than 550cm.mrad.
2006, 30(S1): 34-36.