BBU Instability of ``Dragon-I'' LIA

DAI Zhi-Yong; ZHANG Kai-Zhi; ZHANG Wen-Wei; XIE Yu-Tong

Chinese Physics C> 2008, Vol. 32> Issue(S1) : 289-291

BBU Instability of ``Dragon-I'' LIA

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Abstract：
BBU (Beam breakup) instability once appeared in the early stage of ``Dragon-I'' LIA, which was excited by TM₁₁₀ mode stimulated when the eccentric beam passed through the multi-functional cavity(MFC). The radio frequency characteristics of MFC were analyzed with three methods such as analytic calculation, numerical computation, and measurement. The frequency of the TM₁₁₀ mode from these methods agreed with the experimental results, while the transverse coupling impedance was different from the experimental results by some times. The main BBU exciter was the big transverse coupling impedance of the MFC which could be concluded. A grid was designed to shield the gap of the MFC. The experiments show that the BBU was compressed and the high frequency oscillation disappeared.

References

[1]

. Neil V K, Hall L S, Cooper R K. Further Theoretical Studies of the Beam Breakup Instability. Particle Accelerators, 1979, 9: 213-2222. Chong Y P, Caporaso G J, Strue K W. IEEE Transactionon Nuclear Science, October 1985, NS-32(5)3. DAI Zhi-Yong et al. HEP NP, 2007, 31(4): 395-399(in Chinese)(代志勇等. 高能物理与核物理, 2007, 31(4): 395—399)4. DING Bo-Nan et al. HEP NP, 2005, 29(3): 119-223(in Chinese)(丁伯南等. 高能物理与核物理, 2005, 29(3): 119—223)5. WANG Hua-Cen et al. High Power Laser and Particle Beams, 1996, 8(3): 313-319(in Chinese)(王华岑等. 强激光与粒子束, 2004, 16(10): 1334—1336)6. DAI Zhi-Yong et al. High Power Laser and Particle Beams, 2004, 16(10): 1334-1336(in Chinese)(代志勇等. 强激光与粒子束, 2004, 16(10): 1334—1336)7. ZHANG Kai-Zhi et al. High Power Laser and Particle Beams, 2000, 12(2): 219-223(in Chinese)(张开志等. 强激光与粒子束, 2000, 12(2): 219—223)

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DAI Zhi-Yong, ZHANG Kai-Zhi, ZHANG Wen-Wei and XIE Yu-Tong. BBU Instability of ``Dragon-I'' LIA[J]. Chinese Physics C, 2008, 32(S1): 289-291.

DAI Zhi-Yong, ZHANG Kai-Zhi, ZHANG Wen-Wei and XIE Yu-Tong. BBU Instability of ``Dragon-I'' LIA[J]. Chinese Physics C, 2008, 32(S1): 289-291. shu

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Received: 2008-01-11
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

BBU Instability of ``Dragon-I'' LIA

Corresponding author: DAI Zhi-Yong,

Received Date: 2008-01-11
Accepted Date: 1900-01-01
Available Online: 2008-01-04

Abstract:

BBU (Beam breakup) instability once appeared in the early stage of ``Dragon-I'' LIA, which was excited by TM₁₁₀ mode stimulated when the eccentric beam passed through the multi-functional cavity(MFC). The radio frequency characteristics of MFC were analyzed with three methods such as analytic calculation, numerical computation, and measurement. The frequency of the TM₁₁₀ mode from these methods agreed with the experimental results, while the transverse coupling impedance was different from the experimental results by some times. The main BBU exciter was the big transverse coupling impedance of the MFC which could be concluded. A grid was designed to shield the gap of the MFC. The experiments show that the BBU was compressed and the high frequency oscillation disappeared.