Bunch evolution study in optimization of MeV ultrafastelectron diffraction

LU Xian-Hai; DU Ying-Chao; HUANG Wen-Hui; TANG Chuan-Xiang

doi:10.1088/1674-1137/38/12/128201

Chinese Physics C> 2014, Vol. 38> Issue(12) : 128201 DOI: 10.1088/1674-1137/38/12/128201

Bunch evolution study in optimization of MeV ultrafastelectron diffraction

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Megaelectronvolt ultrafast electron diffraction (UED) is a promising detection tool for ultrafast processes. The quality of diffraction image is determined by the transverse evolution of the probe bunch. In this paper, we study the contributing terms of the emittance and space charge effects to the bunch evolution in the MeV UED scheme, employing a mean-field model with an ellipsoidal distribution as well as particle tracking simulation. The small transverse dimension of the drive laser is found to be critical to improve the reciprocal resolution, exploiting both smaller emittance and larger transverse bunch size before the solenoid. The degradation of the reciprocal spatial resolution caused by the space charge effects should be carefully controlled.

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LU Xian-Hai, DU Ying-Chao, HUANG Wen-Hui and TANG Chuan-Xiang. Bunch evolution study in optimization of MeV ultrafastelectron diffraction[J]. Chinese Physics C, 2014, 38(12): 128201. doi: 10.1088/1674-1137/38/12/128201

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Received: 2014-01-02
Revised: 2014-01-02

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沈阳化工大学材料科学与工程学院沈阳 110142

Bunch evolution study in optimization of MeV ultrafastelectron diffraction

Corresponding author: TANG Chuan-Xiang,

Received Date: 2014-01-02
Accepted Date: 2014-01-02
Available Online: 2014-12-05

Abstract: Megaelectronvolt ultrafast electron diffraction (UED) is a promising detection tool for ultrafast processes. The quality of diffraction image is determined by the transverse evolution of the probe bunch. In this paper, we study the contributing terms of the emittance and space charge effects to the bunch evolution in the MeV UED scheme, employing a mean-field model with an ellipsoidal distribution as well as particle tracking simulation. The small transverse dimension of the drive laser is found to be critical to improve the reciprocal resolution, exploiting both smaller emittance and larger transverse bunch size before the solenoid. The degradation of the reciprocal spatial resolution caused by the space charge effects should be carefully controlled.