Beam 2-D Phase-Space Measurement with CT and Cerenkov Radiation “Double Imaging Method”

GU An-Jia; ZHAO Kui; DING Yuan-Tao; ZHANG Bao-Cheng; QUAN Sheng-Wen; CHEN Jia-Er

Chinese Physics C> 2003, Vol. 27> Issue(5) : 455-459

Beam 2-D Phase-Space Measurement with CT and Cerenkov Radiation “Double Imaging Method”

Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

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Abstract：
This paper proposes a new method to measure the 2-D beam transverse phase space with computerized tomography (CT) technique and Cerenkov radiation "double imaging method". The usual method with CT technique entirely depends on the quadrupole-scanning and can not get a full π Radon rotation angle, which is essential to the Radon transform, the mathematic fundamental of CT technique. Therefore, it has to prior assume a certain kind of phase space distribution to extrapolate the vacancy of Radon rotation angle, which makes the reconstructed image imperfect and yields errors especially when the phase space distributions practically are not ideal. In this paper, by means of Cerenkov radiation double image method and mathematical analysis, we obtain a full rotation angle of the beam phase space precisely from 0 to π. Hence we can measure the actual 2-D transverse-phase-space density without making any prior assumptions about phase space distributions. The simulation results show that this new method is feasible and with much higher precision.

References

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GU An-Jia, ZHAO Kui, DING Yuan-Tao, ZHANG Bao-Cheng, QUAN Sheng-Wen and CHEN Jia-Er. Beam 2-D Phase-Space Measurement with CT and Cerenkov Radiation “Double Imaging Method”[J]. Chinese Physics C, 2003, 27(5): 455-459.

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Received: 2002-08-28
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Beam 2-D Phase-Space Measurement with CT and Cerenkov Radiation “Double Imaging Method”

Corresponding author: GU An-Jia,

Institute of Heavy Ion Physics, Peking University, Beijing 100871, China

Received Date: 2002-08-28

Accepted Date: 1900-01-01

Available Online: 2003-05-05

Abstract: This paper proposes a new method to measure the 2-D beam transverse phase space with computerized tomography (CT) technique and Cerenkov radiation "double imaging method". The usual method with CT technique entirely depends on the quadrupole-scanning and can not get a full π Radon rotation angle, which is essential to the Radon transform, the mathematic fundamental of CT technique. Therefore, it has to prior assume a certain kind of phase space distribution to extrapolate the vacancy of Radon rotation angle, which makes the reconstructed image imperfect and yields errors especially when the phase space distributions practically are not ideal. In this paper, by means of Cerenkov radiation double image method and mathematical analysis, we obtain a full rotation angle of the beam phase space precisely from 0 to π. Hence we can measure the actual 2-D transverse-phase-space density without making any prior assumptions about phase space distributions. The simulation results show that this new method is feasible and with much higher precision.

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Beam 2-D Phase-Space Measurement with CT and Cerenkov Radiation “Double Imaging Method”

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