COOL2015 - List of Authors (Wu, J.X.)

Paper

Title

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Signals from a Beam Performing Betatron Oscillations Using an Electrostatic Electrode Model with Rectangular Boundaries

51

F. Nolden
GSI, Darmstadt, Germany
J.X. Wu
IMP/CAS, Lanzhou, People's Republic of China

We present a novel electrostatic electrode model with rectangular boundaries. The fields are calculated using a conformal mapping. These fields are used to calculate the signal due to a relativistic beam. The response at harmonics of the revolution frequency and at the corresponding horizontal and vertical sidebands is given. The underlying nonlinear formalism is due to Bisognano and Leeman. The electrode geometry of the new stochastic cooling system at the CSRe ring at the IMP in Lanzhou is taken to derive the responses in the sum mode, the horizontal difference mode, and the vertical difference mode.

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TUPF03

Test Experiment of Laser Cooling of Relativistic Li-Like C³⁺ Ion Beams With a Pulsed UV-Laser System at the CSRE*

W.Q. Wen, X. Chuai, B. Hai, Z. Huang, J. Li, X. Ma, L.J. Mao, R.S. Mao, H. Wang, J.X. Wu, J.W. Xia, J.C. Yang, J. Yang, Y.J. Yuan, D. Zhang, D. Zhao, X. Zhu
IMP/CAS, Lanzhou, People's Republic of China
G. Birkl, B. Rein, T. Walther
TU Darmstadt, Darmstadt, Germany
O. Boine-Frankenheim, L. Eidam, D.F.A. Winters
GSI, Darmstadt, Germany
M.H. Bussmann, M. Löser
HZDR, Dresden, Germany
U. Schramm, M. Siebold
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany
U. Schramm
TU Dresden, Dresden, Germany

Funding: * Work supported by NSFC No.11221064, GJHZ1305 and BMBF
A test experiment was performed with 12C³⁺ ion beams at an energy of 122 MeV/u on the CSRe in September 2014. A pulsed UV laser system from HZDR was employed for this test laser cooling experiment. The closed 2s1/2―2p1/2 optical transition at a wavelength of 155.07 nm of the Li-like carbon ions was Doppler-shifted to be resonant with the UV-laser at the wavelength of 257.5 nm in the experiment. The injected number of C³⁺ ~5×10⁸,which was sufficient for testing laser cooling. Stable operation of the CSRe was observed over several days, including rf-bunching and diagnostic systems. The dynamics of the electron-cooled and RF-bunched ion beams were investigated systematically. However, first results did not yet indicate a strong interaction of the laser with the ions. Further data analysis is currently in progress. We will present the experimental results on this workshop, including Schottky spectra of electron-cooled and rf-bunched ion beams, fluorescence signals observed by the UV-sensitive PMT and CPM, and the planning of the upcoming laser cooling experiment at the CSRe.
# x.ma@impcas.ac.cn

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THXCR04

Status and Upgrade of HIRFL Accelerator Complex at IMP

Y.J. Yuan, X.J. Hu, X.N. Li, X. Ma, L.J. Mao, J.X. Wu, J.W. Xia, J.C. Yang, W.Q. Yang, X.D. Yang, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China

The Heavy Ion Research Facility at Lanzhou (HIRFL) is the only one large scale heavy ion accelerator complex that uses cyclotron(SFC and SSC) as injector, synchrotron(CSRm) for accumulation and post acceleration, storage ring(CSRe) for in ring experiments in China. To reach the increasing requirements from nuclear physics, atomic physics, interdisciplinary science and their applications, many upgrading plans were launched or scheduled. The present status and recent upgrading plans of HIRFL will be introduced in this paper. The operation of the electron coolers and related cooling experimental results are presented. For the upgrading plans, the development of new Linac injector for HIRFL and the new high voltage system of 300keV electron cooler will be discussed in details.

Slides THXCR04 [22.346 MB]

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Paper	Title	Page
MOPF09	Signals from a Beam Performing Betatron Oscillations Using an Electrostatic Electrode Model with Rectangular Boundaries	51
	F. Nolden GSI, Darmstadt, Germany J.X. Wu IMP/CAS, Lanzhou, People's Republic of China
	We present a novel electrostatic electrode model with rectangular boundaries. The fields are calculated using a conformal mapping. These fields are used to calculate the signal due to a relativistic beam. The response at harmonics of the revolution frequency and at the corresponding horizontal and vertical sidebands is given. The underlying nonlinear formalism is due to Bisognano and Leeman. The electrode geometry of the new stochastic cooling system at the CSRe ring at the IMP in Lanzhou is taken to derive the responses in the sum mode, the horizontal difference mode, and the vertical difference mode.
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TUPF03	Test Experiment of Laser Cooling of Relativistic Li-Like C³⁺ Ion Beams With a Pulsed UV-Laser System at the CSRE*
	W.Q. Wen, X. Chuai, B. Hai, Z. Huang, J. Li, X. Ma, L.J. Mao, R.S. Mao, H. Wang, J.X. Wu, J.W. Xia, J.C. Yang, J. Yang, Y.J. Yuan, D. Zhang, D. Zhao, X. Zhu IMP/CAS, Lanzhou, People's Republic of China G. Birkl, B. Rein, T. Walther TU Darmstadt, Darmstadt, Germany O. Boine-Frankenheim, L. Eidam, D.F.A. Winters GSI, Darmstadt, Germany M.H. Bussmann, M. Löser HZDR, Dresden, Germany U. Schramm, M. Siebold Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Radiation Physics, Dresden, Germany U. Schramm TU Dresden, Dresden, Germany
	Funding: * Work supported by NSFC No.11221064, GJHZ1305 and BMBF A test experiment was performed with 12C³⁺ ion beams at an energy of 122 MeV/u on the CSRe in September 2014. A pulsed UV laser system from HZDR was employed for this test laser cooling experiment. The closed 2s1/2―2p1/2 optical transition at a wavelength of 155.07 nm of the Li-like carbon ions was Doppler-shifted to be resonant with the UV-laser at the wavelength of 257.5 nm in the experiment. The injected number of C³⁺ ~5×10⁸,which was sufficient for testing laser cooling. Stable operation of the CSRe was observed over several days, including rf-bunching and diagnostic systems. The dynamics of the electron-cooled and RF-bunched ion beams were investigated systematically. However, first results did not yet indicate a strong interaction of the laser with the ions. Further data analysis is currently in progress. We will present the experimental results on this workshop, including Schottky spectra of electron-cooled and rf-bunched ion beams, fluorescence signals observed by the UV-sensitive PMT and CPM, and the planning of the upcoming laser cooling experiment at the CSRe. # x.ma@impcas.ac.cn
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THXCR04	Status and Upgrade of HIRFL Accelerator Complex at IMP
	Y.J. Yuan, X.J. Hu, X.N. Li, X. Ma, L.J. Mao, J.X. Wu, J.W. Xia, J.C. Yang, W.Q. Yang, X.D. Yang, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China
	The Heavy Ion Research Facility at Lanzhou (HIRFL) is the only one large scale heavy ion accelerator complex that uses cyclotron(SFC and SSC) as injector, synchrotron(CSRm) for accumulation and post acceleration, storage ring(CSRe) for in ring experiments in China. To reach the increasing requirements from nuclear physics, atomic physics, interdisciplinary science and their applications, many upgrading plans were launched or scheduled. The present status and recent upgrading plans of HIRFL will be introduced in this paper. The operation of the electron coolers and related cooling experimental results are presented. For the upgrading plans, the development of new Linac injector for HIRFL and the new high voltage system of 300keV electron cooler will be discussed in details.
	Slides THXCR04 [22.346 MB]
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