Layout optimization for flash radiography with scatter

Jin, 刘进 Liu; Jun, 刘军 Liu; Linwen, 章林文 Zhang; Jiangjun, 施将君 Shi

doi:10.3788/hplpb20122401.0193

Cited by 3 publications

(2 citation statements)

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“…As mentioned in the last section, the RF gun structures adopted by Refs. [8][9][10] could generate short bunches with a low energy spread and low transverse emittance, but the effective bunch charge was too low to drive the FEL. To solve this issue, the grided electron gun with double anodes is preferred to provide the DC beam instead of the diode electron gun, standing-wave cavity dimensions are optimized and RF parameters are tuned independently as well.…”

Section: Performance-enhanced Ec-itc Rf Gunmentioning

confidence: 99%

“…[5][6][7] proposed a preliminary concept of an ITC RF gun with a much simpler structure, which has two independent cavities without α-magnets, while feed-in powers and phases could be adjusted independently. An improvement method using an external cath-ode instead of an embed one has been performed in the National Synchrotron Radiation Laboratory (NSRL), which almost eliminated the back bombardment effect by reducing the electric field influences on the cathode surface; the effective bunch charge has been increased from tens of pC to ∼130 pC within 4.5 ps FWHM (Full Width at Half Maximum) length, while the energy spread (FWHM) is only ∼0.2% [8][9][10]. However, the main performance of the EC-ITC RF gun, especially the effective bunch charge, are hard to increase due to the space charge effect of the high current electron beam.…”

Section: Introductionmentioning

confidence: 99%

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Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

Hu¹,

Chen²,

Pei³

et al. 2014

Chinese Phys. C

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Abstract:To meet requirements of high performance THz-FEL (Free Electron Laser), a compact scheme of FEL injector was proposed. Thermionic cathode was chosen to emit electrons instead of photo-cathode with complex structure and high cost. The effective bunch charge was improved to ~200pC by adopting enhanced EC-ITC (External Cathode Independently Tunable Cells) RF gun to extract micro-bunches, and back bombardment effects were almost eliminated as well. Constant gradient accelerator structures were designed to improve energy to ~14MeV, while focusing system was applied for emittance suppressing and bunch state maintenance. Physical design and beam dynamics of key components for FEL injector were analyzed. Furthermore, start-to-end simulations with multi-pulses were performed by using homemade MATLAB and Parmela. The results show that continual high brightness electron bunches with low energy spread and emittance could be obtained stably.

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Section: Performance-enhanced Ec-itc Rf Gunmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

Hu¹,

Chen²,

Pei³

et al. 2014

Chinese Phys. C

View full text Add to dashboard Cite

show abstract

Determination of the blur size of a radiographic system from density reconstruction

Jin

Jun

Yuefeng

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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Forward model with space-variant of source size for reconstruction on X-ray radiographic image

Jin

Yuefeng

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Forward imaging technique is the base of combined method on density reconstruction with the forward calculation and inverse problem solution. In the paper, we introduced the projection equation for the radiographic system with areal source blur and detector blur, gained the projecting matrix from any point source to any detector pixel with x-ray trace technique, proposed the ideal on gridding the areal source as many point sources with different weights, and used the blurring window as the effect of the detector blur. We used the forward projection equation to gain the same deviation information about the object edge as the experimental image. Our forward projection equation is combined with Constrained Conjugate Gradient method to form a new method for density reconstruction, XTRACE-CCG. The new method worked on the simulated image of French Test Object and experimental image. The same results have been concluded the affecting range of the blur is decreased and can be controlled to one or two pixels. The method is also suitable for reconstruction of density-variant object. The capability of our method to handle blur effect is useful for all radiographic systems with larger source size comparing to pixel size. *

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Layout optimization for flash radiography with scatter

Cited by 3 publications

References 0 publications

Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

Determination of the blur size of a radiographic system from density reconstruction

Forward model with space-variant of source size for reconstruction on X-ray radiographic image

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