Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

HUANG Xi-Yang; JIAO Yi; XU Gang; CUI Xiao-Hao

doi:10.1088/1674-1137/39/5/057001

Chinese Physics C> 2015, Vol. 39> Issue(5) : 057001 DOI: 10.1088/1674-1137/39/5/057001

Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

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Abstract：
The coherent synchrotron radiation (CSR) effect in a bending path plays an important role in transverse emittance dilution in high-brightness light sources and linear colliders, where the electron beams are of short bunch length and high peak current. Suppression of the emittance growth induced by CSR is critical to preserve the beam quality and help improve the machine performance. It has been shown that the CSR effect in a double-bend achromat (DBA) can be analyzed with the two-dimensional point-kick analysis method. In this paper, this method is applied to analyze the CSR effect in a triple-bend achromat (TBA) with symmetric layout, which is commonly used in the optics designs of energy recovery linacs (ERLs). A condition of cancelling the CSR linear effect in such a TBA is obtained, and is verified through numerical simulations. It is demonstrated that emittance preservation can be achieved with this condition, and to a large extent, has a high tolerance to the fluctuation of the initial transverse phase space distribution of the beam.

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HUANG Xi-Yang, JIAO Yi, XU Gang and CUI Xiao-Hao. Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats[J]. Chinese Physics C, 2015, 39(5): 057001. doi: 10.1088/1674-1137/39/5/057001

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Received: 2014-03-20
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沈阳化工大学材料科学与工程学院沈阳 110142

Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

Received Date: 2014-03-20

Accepted Date: 1900-01-01

Available Online: 2015-05-05

Abstract: The coherent synchrotron radiation (CSR) effect in a bending path plays an important role in transverse emittance dilution in high-brightness light sources and linear colliders, where the electron beams are of short bunch length and high peak current. Suppression of the emittance growth induced by CSR is critical to preserve the beam quality and help improve the machine performance. It has been shown that the CSR effect in a double-bend achromat (DBA) can be analyzed with the two-dimensional point-kick analysis method. In this paper, this method is applied to analyze the CSR effect in a triple-bend achromat (TBA) with symmetric layout, which is commonly used in the optics designs of energy recovery linacs (ERLs). A condition of cancelling the CSR linear effect in such a TBA is obtained, and is verified through numerical simulations. It is demonstrated that emittance preservation can be achieved with this condition, and to a large extent, has a high tolerance to the fluctuation of the initial transverse phase space distribution of the beam.

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Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

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Suppression of the emittance growth induced by coherent synchrotron radiation in triple-bend achromats

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