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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

  • 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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    [1] . Herman G T.Image Reconstruction from Projections:Implementation and Applications.Germany:Springer Vcrlag,1992.17—302. McKee C B,O'Shea P G et al.Nucl.Instr. Meth.InPhys.Res.,1995,A358:264—267 3. SHI Yi-Jin.High Power Laser and Particle Beams,2000,12(2):231—234(in Chinese)(施义晋.强激光与粒子束,2000,12(2):231—234)4. Geitz M,Schmidt G,Schmuscr P.Phase Space Tomography at the TES-LA Test Facility LINAC ,Proccedings of the 1999 Particle Accelerator Conference,New York,19995. GU An-Jia,DING Yuan-Tao,ZHAO Kui et al.HEP NP ,2003,27(2):163(in Chinese)(谷安佳,丁原涛,赵夔等.高能物理与核物理,2003,27(2):163)

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