Realization of a locally-round beam in an ultimate storage ring using solenoids

XU Gang; JIAO Yi; TIAN Sai-Ke

doi:10.1088/1674-1137/37/6/067002

Chinese Physics C> 2013, Vol. 37> Issue(6) : 067002 DOI: 10.1088/1674-1137/37/6/067002

Realization of a locally-round beam in an ultimate storage ring using solenoids

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Abstract：
'Ultimate" storage rings (USRs), with electron emittance smaller than 100 pm·rad and on the scale of the diffraction limit for hard X-rays in both transverse planes, have the potential to deliver photons with much higher brightness and higher transverse coherence than that projected for the rings currently operational or under construction. Worldwide efforts have been made to design and to build light sources based on USRs. How to obtain a round beam, i.e., a beam with equivalent transverse emittances, is an important topic in USR studies. In this paper, we show that a locally-round beam can be achieved by using a pair of solenoid and anti-solenoid with a circularly polarized undulator located in between. Theoretical analysis and application of this novel method, particularly to one of the Beijing Advanced Photon Source storage ring design having natural emittance of 75 pm·rad, are presented.

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BEI M et al. Nucl. Instrum. Methods Phys. Res., Sect. A, 2010, 622: 518[2] Elleaume P, Ropert A. Nucl. Instrum. Methods Phys. Res., Sect. A, 2003, 500: 18[3] Tsumaki K, Kumagai N K. Nucl. Instrum. Methods Phys. Res., Sect. A, 2006, 565: 394[4] Borland M. Proc. of the SRI09. Melbourne: AIP, 2009. 911[5] JING Y, Lee S Y, Sokol P E. Proc. of the 2011 Particle Accelerator Conference. New York: IEEE, 2011. 781[6] CAI Y et al. Phys. Rev. ST Accel. Beams, 2012, 15: 054002[7] XU Gang, JIAO Yi. Towards the Ultimate Storage Ring: the Lattice Design for Beijing Advanced Photon Source. Chin. Phys. C (HEP NP), 2013, 37(5): 057003[8] YONG E M. Collisions of Round Beams at the Cornell Electron Storage Ring in Preparation for Mbius operation (Ph.D. Thesis). Ithaca, Cornell University, 1998[9] CHAO A W, Raimondi P. SLAC-PUB-14808[10] Borland M. APS Preprint, Advanced Photon Source LS-287, 2000[11] Courant E D, Snyder H S. Ann. Phys. (Paris), 1958, 3: 1[12] CHAO A W, Tigner M. Handbook of Accelerator Physics and Engineering. Third Edition. Singapore: World Scientific, 2006. 74[13] Deb K et al. IEEE Transactions on Evolutionary Computation, 2002, 6(efeq2): 182-197[14] Takaki H et al. Phys. Rev. ST Accel. Beams, 201, 13: 020705[15] ZHU Zi-An. Private communication

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XU Gang, JIAO Yi and TIAN Sai-Ke. Realization of a locally-round beam in an ultimate storage ring using solenoids[J]. Chinese Physics C, 2013, 37(6): 067002. doi: 10.1088/1674-1137/37/6/067002

XU Gang, JIAO Yi and TIAN Sai-Ke. Realization of a locally-round beam in an ultimate storage ring using solenoids[J]. Chinese Physics C, 2013, 37(6): 067002. doi: 10.1088/1674-1137/37/6/067002 shu

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Received: 2012-09-10
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

Realization of a locally-round beam in an ultimate storage ring using solenoids

Received Date: 2012-09-10
Accepted Date: 1900-01-01
Available Online: 2013-06-05

Abstract: 'Ultimate" storage rings (USRs), with electron emittance smaller than 100 pm·rad and on the scale of the diffraction limit for hard X-rays in both transverse planes, have the potential to deliver photons with much higher brightness and higher transverse coherence than that projected for the rings currently operational or under construction. Worldwide efforts have been made to design and to build light sources based on USRs. How to obtain a round beam, i.e., a beam with equivalent transverse emittances, is an important topic in USR studies. In this paper, we show that a locally-round beam can be achieved by using a pair of solenoid and anti-solenoid with a circularly polarized undulator located in between. Theoretical analysis and application of this novel method, particularly to one of the Beijing Advanced Photon Source storage ring design having natural emittance of 75 pm·rad, are presented.

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