Online monitoring of beam phase and intensity using lock-in amplifiers

被引：6

作者：

Koyama, R. ^{[1
,2
]}

Sakamoto, N. ^{[1
]}

Fujimaki, M. ^{[1
]}

Fukunishi, N. ^{[1
]}

Goto, A. ^{[1
]}

Hemmi, M. ^{[1
]}

Kase, M. ^{[1
]}

Suda, K. ^{[1
]}

Watanabe, T. ^{[1
]}

Yamada, K. ^{[1
]}

Kamigaito, O. ^{[1
]}

机构：

[1] RIKEN, Nishina Ctr Accelerator Based Sci, Wako, Saitama 3510198, Japan

[2] SHI Accelerator Serv Ltd, Shinagawa, Tokyo 1410032, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2013年 / 729卷

关键词：

Beam phase monitor; Lock-in amplifier; Cyclotron; Isochronism;

D O I：

10.1016/j.nima.2013.08.056

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have developed a monitoring system dedicated for heavy-ion cyclotrons that incorporates lock-in amplifiers (LlAs) that can measure the beam phase of signals from phase probe with an amplitude of a few hundred nanovolts. We have compared the performance of the LlA system with that of a conventional system that incorporates oscilloscopes (OSCs). It was confirmed that the LlA system has a much higher precision than the OSC system by the measurement with a wide dynamic range of beam current. Isochronism measurements for a ring cyclotron with a low velocity gain (1.5) were made using both systems and excellent agreement was found between them. However there was a discrepancy between the beam phase measurements using the OSC system and the LlA system, for the case of a ring cyclotron with a high velocity gain of 4.0. It turned out due to a large radial variation of the phase width of circulating beam bunch according to a radial distribution of the acceleration voltage. It was also confirmed that the cable dispersion disturbs the beam-phase measurement using OSC system. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：788 / 799

页数：12

共 13 条

[1]

Goto A., 1989, P 12 INT C CYCL THEI, P51

[2] Development of the carbon foils as charge strippers for high-intensity uranium ion beams [J].

Hasebe, Hiroo ;

Kuboki, Hironori ;

Okuno, Hiroki ;

Fukunishi, Nobuhisa ;

Kamigaito, Osamu ;

Imao, Hiroshi ;

Goto, Akira ;

Kase, Masayuki .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2011, 655 (01) :57-60

[3]

Inabe N., 2004, CYCL 04 TOK OCT, P200

[4]

Kamitsubo H., 1986, P 11 INT C CYCL THEI, P17

[5]

Koyama R., 2008, P 11 EUR PART ACC C, P1173

[6]

Koyama R., 2009, RIKEN ACCELERATOR PR, V42, pxviii

[7]

Mitsumoto T., 2004, CYCL 04 TOK OCT, P384

[8] VARIABLE FREQUENCY HEAVY-ION LINAC, RILAC .1. DESIGN, CONSTRUCTION AND OPERATION OF ITS ACCELERATING STRUCTURE [J].

ODERA, M ;

CHIBA, Y ;

TONUMA, T ;

HEMMI, M ;

MIYAZAWA, Y ;

INOUE, T ;

KAMBARA, T ;

KASE, M ;

KUBO, T ;

YOSHIDA, F .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1984, 227 (02) :187-195

[9]

Ohnishi J., 2004, PROC 17 INT C CYCLOT, P197

[10] The superconducting ring cyclotron in RIKEN [J].

Okuno, H. ;

Ohnishi, J. ;

Yamada, K. ;

Fukunishi, N. ;

Ikegami, K. ;

Maie, T. ;

Hasebe, H. ;

Hamanaka, M. ;

Kase, M. ;

Goto, A. ;

Yano, Y. .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2007, 17 (02) :1063-1068

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