IPAC2013 - List of Authors (Kang, L.)

Paper	Title	Page
WEPME023	Study of the Vibration of the AC Dipole and Magnetic Measurement Girder for CSNS/RCS	2980
	R.H. Liu, L. Kang, H. Qu, G.Y. Wang, H.J. Wang, J. S. Zhang IHEP, Beijing, People's Republic of China
	The dipole magnet of the China Spallation Neutron Source Rapid-cycling Synchrotron (RCS) will be operated at a 25Hz sinusoidal alternating current which causes severe vibration. The vibration will influence the long-term safety and reliable operation of the magnet. By taking the magnet and magnetic measurement girder as a specific model system, a method for analyzing and studying the dynamic characteristic of the system is put forward by combining theoretical calculation with experimental testing. And the ctive vibration of magnet is different with passive vibration which was causes by ground vibration, so a new isolator was designed to decrease the vibratory force and avoid the resonance phenomenon.

THPFI024	Application of Electropolishing in CSNS/RCS Primary Collimator Scrapers	3348
	L. Kang, Z.X. He, H. Qu, J.B. Yu, Y.Q. Zou IHEP, Beijing, People's Republic of China
	According to the requirements for the beam collimation system physical design of the rapid cycling synchrotron (RCS) of China Spallation Neutron Source (CSNS) , the primary collimator scrapers are made of 0.17±0.005mm thickness tungsten sheets. The machining of the tungsten sheet is very difficult because of high hardness and characteristics of the intrinsic brittleness of tungsten. In this paper, electropolishing processing methods is used for tungsten sheets processing. A special electropolishing device is designed according to the principle and process of electropolishing. The processing of tungsten sheets are finally completed after a series of experiments. And the rules of electropolishing for tungsten sheet processing are obtained according to the experimental results.

THPFI026	DESIGN OF CSNS R DUMP WINDOW	3354
	L. Liu, L. Kang, X.J. Nie, H. Qu IHEP, Beijing, People's Republic of China
	The China Spallation Neutron Source (CSNS) accelerator systems will provide a 1.6 Gev proton beam to a target for neutron production. The extraction dump is used to incept the waste beam in the Ring-Target transport line. At the end of the beam pipe, we adopt a thin window to ensure the accelerator vacuum. When beam gets across the window, temperature of the window will be elevator because of the energy deposit. So, the study on structure and thermal stress analysis is necessary. This article expatiates the way on calculating the energy deposit and thermal stress analyses.

THPFI027	STUDY ON STRUCTURE AND THERMAL ANALYSIS OF CSNS R BEAM DUMP	3356
	L. Liu, L. Kang, X.J. Nie, H. Qu IHEP, Beijing, People's Republic of China
	The China Spallation Neutron Source (CSNS) accelerator systems will provide a 1.6 Gev proton beam to a target for neutron production. Beam dump system is an important part of CSNS, and it is used to incept the waste beam. The beam dump system is composed with vacuum part and shielding part. For the design of shielding part, the material is steel at the centre and concrete outside, we must control the temperature of steel and concrete not too high, and it will be a serious problem that the concrete crazes because of the high temperature. So the thermal analyses must be done to ensure safety. Taking CSNS R dump for example, we use software to make model and analyze the thermal, then optimizing the result. According to the result, we control the work time and dimension of the beam to control the temperature of the iron and concrete. This article expatiate the study on the structure design and thermal analyses.

THPFI028	Anti-earthquake Structural Design for CSNS Beam Dump	3358
	X.J. Nie, L. Kang, L. Liu, H. Qu IHEP, Beijing, People's Republic of China
	To ensure the beam dump shield iron can resist the damage of earthquake and maintain the normal protective capability, anti-earthquake design was carried out in this paper. The parts for seismic resistance were designed according to the feature of foundation building. The force model was reached through the analysis of seismic load. The structure dimension was decided on the basis of the theory of strength. A pre-buried plate with hooks was achieved and the force model was simplified as fixed end. The minimal diameter of hook showed 30mm. The fixing device with plate decreases the precision requirement of foundation building and can be used to fix the shield iron to resist the earthquake.

THPFI029	The Structure Design and Analysis of Proton Beam Window for CSNS	3361
	H.J. Wang, L. Kang, R.H. Liu, H. Qu, D.H. Zhu IHEP, Beijing, People's Republic of China
	The proton beam window (PBW) is one of the key devices of China Spallation Neutron Source (CSNS). In this paper, a new designed PBW structure called single-double layer structure is discussed. The new structure will be used in CSNS, and it is designed based on the beam characteristic of CSNS, which power is 100 kW. The structure design and thermal-analysis are presented, and the convective coefficient of cooling water is calculated. Besides, the radiation damage is discussed to assure there is no danger of radiation lifetime of PBW.

THPFI031	Development of Beam Collimators for the 1.6 GeV Rapid Cycling Synchrotron of CSNS	3364
	J.B. Yu, pf.He. He, L. Kang, H. Qu, Y.Q. Zou IHEP, Beijing, People's Republic of China
	In order to reduce the uncontrolled losses in the localized station, the beam collimation system has been performed for the 1.6GeV synchrotron of CSNS. The CSNS/RCS transverse collimation system is designed to be a two-stage system which consists of one primary collimator and four secondary collimators. Much work about machinery design and manufacture of the collimation system has been done till now. This paper will show the exterior frame of collimation system by considering the physical demands and spatial position. Then the progress which contains design and machining of collimators will also be introduced. Finally some problems which are mainly about the design of secondary collimators will be mentioned.

THPFI032	The Design and Analysis of Proton Beam Window for CSNSIII	3367
	H.J. Wang, L. Kang, R.H. Liu, H. Qu, D.H. Zhu IHEP, Beijing, People's Republic of China
	The proton beam window (PBW) is one of the key devices of China Spallation Neutron Source (CSNS). When the beam power of CSNS upgrades from 100kw to 500kw (CSNSIII), the present single-double layer structure of PBW cannot meet the demands. The PBW will be changed to other structure. This paper discusses sandwiched structure and multiple pipe structure, and the later one is chosen as the PBW of CSNSIII. An appropriate convective coefficient of cooling water is chosen, based on which the detailed thermal-stress analysis is presented. Besides, the lifetime is estimated. All these analyses show the designed PBW can work well in CSNSIII.

Paper

Title

Page

Study of the Vibration of the AC Dipole and Magnetic Measurement Girder for CSNS/RCS

2980

R.H. Liu, L. Kang, H. Qu, G.Y. Wang, H.J. Wang, J. S. Zhang
IHEP, Beijing, People's Republic of China

The dipole magnet of the China Spallation Neutron Source Rapid-cycling Synchrotron (RCS) will be operated at a 25Hz sinusoidal alternating current which causes severe vibration. The vibration will influence the long-term safety and reliable operation of the magnet. By taking the magnet and magnetic measurement girder as a specific model system, a method for analyzing and studying the dynamic characteristic of the system is put forward by combining theoretical calculation with experimental testing. And the ctive vibration of magnet is different with passive vibration which was causes by ground vibration, so a new isolator was designed to decrease the vibratory force and avoid the resonance phenomenon.

THPFI024

Application of Electropolishing in CSNS/RCS Primary Collimator Scrapers

3348

L. Kang, Z.X. He, H. Qu, J.B. Yu, Y.Q. Zou
IHEP, Beijing, People's Republic of China

According to the requirements for the beam collimation system physical design of the rapid cycling synchrotron (RCS) of China Spallation Neutron Source (CSNS) , the primary collimator scrapers are made of 0.17±0.005mm thickness tungsten sheets. The machining of the tungsten sheet is very difficult because of high hardness and characteristics of the intrinsic brittleness of tungsten. In this paper, electropolishing processing methods is used for tungsten sheets processing. A special electropolishing device is designed according to the principle and process of electropolishing. The processing of tungsten sheets are finally completed after a series of experiments. And the rules of electropolishing for tungsten sheet processing are obtained according to the experimental results.

THPFI026

DESIGN OF CSNS R DUMP WINDOW

3354

L. Liu, L. Kang, X.J. Nie, H. Qu
IHEP, Beijing, People's Republic of China

The China Spallation Neutron Source (CSNS) accelerator systems will provide a 1.6 Gev proton beam to a target for neutron production. The extraction dump is used to incept the waste beam in the Ring-Target transport line. At the end of the beam pipe, we adopt a thin window to ensure the accelerator vacuum. When beam gets across the window, temperature of the window will be elevator because of the energy deposit. So, the study on structure and thermal stress analysis is necessary. This article expatiates the way on calculating the energy deposit and thermal stress analyses.

THPFI027

STUDY ON STRUCTURE AND THERMAL ANALYSIS OF CSNS R BEAM DUMP

3356

L. Liu, L. Kang, X.J. Nie, H. Qu
IHEP, Beijing, People's Republic of China

The China Spallation Neutron Source (CSNS) accelerator systems will provide a 1.6 Gev proton beam to a target for neutron production. Beam dump system is an important part of CSNS, and it is used to incept the waste beam. The beam dump system is composed with vacuum part and shielding part. For the design of shielding part, the material is steel at the centre and concrete outside, we must control the temperature of steel and concrete not too high, and it will be a serious problem that the concrete crazes because of the high temperature. So the thermal analyses must be done to ensure safety. Taking CSNS R dump for example, we use software to make model and analyze the thermal, then optimizing the result. According to the result, we control the work time and dimension of the beam to control the temperature of the iron and concrete. This article expatiate the study on the structure design and thermal analyses.

THPFI028

Anti-earthquake Structural Design for CSNS Beam Dump

3358

X.J. Nie, L. Kang, L. Liu, H. Qu
IHEP, Beijing, People's Republic of China

To ensure the beam dump shield iron can resist the damage of earthquake and maintain the normal protective capability, anti-earthquake design was carried out in this paper. The parts for seismic resistance were designed according to the feature of foundation building. The force model was reached through the analysis of seismic load. The structure dimension was decided on the basis of the theory of strength. A pre-buried plate with hooks was achieved and the force model was simplified as fixed end. The minimal diameter of hook showed 30mm. The fixing device with plate decreases the precision requirement of foundation building and can be used to fix the shield iron to resist the earthquake.

THPFI029

The Structure Design and Analysis of Proton Beam Window for CSNS

3361

H.J. Wang, L. Kang, R.H. Liu, H. Qu, D.H. Zhu
IHEP, Beijing, People's Republic of China

The proton beam window (PBW) is one of the key devices of China Spallation Neutron Source (CSNS). In this paper, a new designed PBW structure called single-double layer structure is discussed. The new structure will be used in CSNS, and it is designed based on the beam characteristic of CSNS, which power is 100 kW. The structure design and thermal-analysis are presented, and the convective coefficient of cooling water is calculated. Besides, the radiation damage is discussed to assure there is no danger of radiation lifetime of PBW.

THPFI031

Development of Beam Collimators for the 1.6 GeV Rapid Cycling Synchrotron of CSNS

3364

J.B. Yu, pf.He. He, L. Kang, H. Qu, Y.Q. Zou
IHEP, Beijing, People's Republic of China

In order to reduce the uncontrolled losses in the localized station, the beam collimation system has been performed for the 1.6GeV synchrotron of CSNS. The CSNS/RCS transverse collimation system is designed to be a two-stage system which consists of one primary collimator and four secondary collimators. Much work about machinery design and manufacture of the collimation system has been done till now. This paper will show the exterior frame of collimation system by considering the physical demands and spatial position. Then the progress which contains design and machining of collimators will also be introduced. Finally some problems which are mainly about the design of secondary collimators will be mentioned.

THPFI032

The Design and Analysis of Proton Beam Window for CSNSIII

3367

H.J. Wang, L. Kang, R.H. Liu, H. Qu, D.H. Zhu
IHEP, Beijing, People's Republic of China

The proton beam window (PBW) is one of the key devices of China Spallation Neutron Source (CSNS). When the beam power of CSNS upgrades from 100kw to 500kw (CSNSIII), the present single-double layer structure of PBW cannot meet the demands. The PBW will be changed to other structure. This paper discusses sandwiched structure and multiple pipe structure, and the later one is chosen as the PBW of CSNSIII. An appropriate convective coefficient of cooling water is chosen, based on which the detailed thermal-stress analysis is presented. Besides, the lifetime is estimated. All these analyses show the designed PBW can work well in CSNSIII.