LINAC2012 - List of Keywords (electromagnetic-fields)

Paper	Title	Other Keywords	Page
SUPB031	The Nonresonant Perturbation Theory Based Field Measurement and Tuning of a Linac Accelerating Structure	linac, RF-structure, pick-up, feedback	80
	W. Fang, Q. Gu, Z.T. Zhao SINAP, Shanghai, People's Republic of China D.C. Tong TUB, Beijing, People's Republic of China
	Assisted by the bead pull technique, the nonresonant perturbation theory is applied for measuring and tuning the field of the linac accelerating structure. The method is capable of making non-touch measurement, amplitude and phase diagnostics, real time mismatch feedback and field tuning. Main considerations on measurement system and of C-band traveling-wave structure are described, the bead pull measurement and the tuning of the C-band traveling-wave linac accelerating structure are presented.

MOPB022	RF Characteristic Studies on the Whole Accelerating Structure for the BEPCII Linear Accelerator	linac, simulation, vacuum, impedance	219
	S. Pei, M. Hou, X. Li, J.R. Zhang IHEP, Beijing, People's Republic of China B.L. Wang SINAP, Shanghai, People's Republic of China
	An accelerating structure is one device to boost the particle energy. 2856 MHz 3 m long travelling wave disk-loaded accelerating structure is applied in BEPCII linac, its RF characteristics are mainly determined by the 84 regular cells located between the input and output couplers. Input and output couplers need to be included when the whole structure RF characteristics are simulated before fabrication; otherwise it would be difficult to obtain the travelling wave fields excited in the whole structure. If the real 3D couplers are modelled during the design process, a large amount of computer resources and time need to be used. However, if the redesigned azimuth symmetric coupler is used to replace the real 3D one during the simulation process, much less computer resources and time are required. With this method proposed here, the simulation results agree well with the theoretically calculated and experimentally measured ones. *peisl@ihep.ac.cn

MOPB086	The Nonresonant Perturbation Theory Based Field Measurement and Tuning of a Linac Accelerating Structure	linac, RF-structure, pick-up, feedback	375
	W. Fang, Q. Gu, Z.T. Zhao SINAP, Shanghai, People's Republic of China D.C. Tong TUB, Beijing, People's Republic of China
	Assisted by the bead pull technique, the nonresonant perturbation theory is applied for measuring and tuning the field of the linac accelerating structure. The method is capable of making non-touch measurement, amplitude and phase diagnostics, real time mismatch feedback and field tuning. Main considerations on measurement system and of C-band traveling-wave structure are described, the bead pull measurement and the tuning of the C-band traveling-wave linac accelerating structure are presented.

TUPLB02	Deflecting Structures with Minimized Level of Aberrations	controls, emittance, diagnostics, RF-structure	445
	V.V. Paramonov RAS/INR, Moscow, Russia
	Funding: in part RBFR N 12-02-00654a Deflecting structures are now widely used for bunch phase space manipulations either in bunch rotation for special bunch diagnostic or in emittance exchange experiments. As a tool for manipulation, the structure itself should provide the minimal phase space perturbations due to non linear additives in the field distribution. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide significant non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Criterion of the field quality estimation is developed and deflecting structures are considered for minimization of non linear additives. Examples with almost aberration free total field distributions are presented.
	Slides TUPLB02 [0.727 MB]

TUPB002	Deflecting Structures with Minimized Level of Aberrations	controls, emittance, diagnostics, RF-structure	476
	V.V. Paramonov RAS/INR, Moscow, Russia
	Funding: in part RBFR N 12-02-00654a Deflecting structures are now widely used for bunch phase space manipulations either in bunch rotation for special bunch diagnostic or in emittance exchange experiments. As a tool for manipulation, the structure itself should provide the minimal phase space perturbations due to non linear additives in the field distribution. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide significant non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Criterion of the field quality estimation is developed and deflecting structures are considered for minimization of non linear additives. Examples with almost aberration free total field distributions are presented.

Paper

Title

Other Keywords

Page

SUPB031

The Nonresonant Perturbation Theory Based Field Measurement and Tuning of a Linac Accelerating Structure

linac, RF-structure, pick-up, feedback

80

W. Fang, Q. Gu, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
D.C. Tong
TUB, Beijing, People's Republic of China

Assisted by the bead pull technique, the nonresonant perturbation theory is applied for measuring and tuning the field of the linac accelerating structure. The method is capable of making non-touch measurement, amplitude and phase diagnostics, real time mismatch feedback and field tuning. Main considerations on measurement system and of C-band traveling-wave structure are described, the bead pull measurement and the tuning of the C-band traveling-wave linac accelerating structure are presented.

MOPB022

RF Characteristic Studies on the Whole Accelerating Structure for the BEPCII Linear Accelerator

linac, simulation, vacuum, impedance

219

S. Pei, M. Hou, X. Li, J.R. Zhang
IHEP, Beijing, People's Republic of China
B.L. Wang
SINAP, Shanghai, People's Republic of China

An accelerating structure is one device to boost the particle energy. 2856 MHz 3 m long travelling wave disk-loaded accelerating structure is applied in BEPCII linac, its RF characteristics are mainly determined by the 84 regular cells located between the input and output couplers. Input and output couplers need to be included when the whole structure RF characteristics are simulated before fabrication; otherwise it would be difficult to obtain the travelling wave fields excited in the whole structure. If the real 3D couplers are modelled during the design process, a large amount of computer resources and time need to be used. However, if the redesigned azimuth symmetric coupler is used to replace the real 3D one during the simulation process, much less computer resources and time are required. With this method proposed here, the simulation results agree well with the theoretically calculated and experimentally measured ones.
*peisl@ihep.ac.cn

MOPB086

The Nonresonant Perturbation Theory Based Field Measurement and Tuning of a Linac Accelerating Structure

linac, RF-structure, pick-up, feedback

375

W. Fang, Q. Gu, Z.T. Zhao
SINAP, Shanghai, People's Republic of China
D.C. Tong
TUB, Beijing, People's Republic of China

Assisted by the bead pull technique, the nonresonant perturbation theory is applied for measuring and tuning the field of the linac accelerating structure. The method is capable of making non-touch measurement, amplitude and phase diagnostics, real time mismatch feedback and field tuning. Main considerations on measurement system and of C-band traveling-wave structure are described, the bead pull measurement and the tuning of the C-band traveling-wave linac accelerating structure are presented.

TUPLB02

Deflecting Structures with Minimized Level of Aberrations

controls, emittance, diagnostics, RF-structure

445

V.V. Paramonov
RAS/INR, Moscow, Russia

Funding: in part RBFR N 12-02-00654a
Deflecting structures are now widely used for bunch phase space manipulations either in bunch rotation for special bunch diagnostic or in emittance exchange experiments. As a tool for manipulation, the structure itself should provide the minimal phase space perturbations due to non linear additives in the field distribution. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide significant non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Criterion of the field quality estimation is developed and deflecting structures are considered for minimization of non linear additives. Examples with almost aberration free total field distributions are presented.

Slides TUPLB02 [0.727 MB]

TUPB002

Deflecting Structures with Minimized Level of Aberrations

controls, emittance, diagnostics, RF-structure

476

V.V. Paramonov
RAS/INR, Moscow, Russia

Funding: in part RBFR N 12-02-00654a
Deflecting structures are now widely used for bunch phase space manipulations either in bunch rotation for special bunch diagnostic or in emittance exchange experiments. As a tool for manipulation, the structure itself should provide the minimal phase space perturbations due to non linear additives in the field distribution. Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide significant non linear additives in the field distribution, leading to emittance growth during phase space manipulation. Criterion of the field quality estimation is developed and deflecting structures are considered for minimization of non linear additives. Examples with almost aberration free total field distributions are presented.