Virtual Accelerator at J-PARC 3 GeV Rapid Cycling Synchrotron
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Virtual Accelerator at J-PARC 3 GeV Rapid Cycling Synchrotron Virtual Accelerator at J-PARC 3 GeV Rapid Cycling Synchrotron H. Harada*, K. Shigaki (Hiroshima University in Japan), H. Hotchi, F. Noda, H. Sak o, H. Suzuki, Y. Irie (JAEA in Japan), K. Furukawa (KEK in Japan), S. Machida (CCLRC RAL in UK) * 1 st Author : Hiroyuki Harada, Email : [email protected] J-PARC Facility J-PARC Facility ☆ Accelerators at J-PARC ▼ 400 MeV (181 MeV at phase-1) LINAC ▼ 3 GeV 25 Hz Rapid Cycling Synchrotron (RC S) ▼ 50 GeV Main Ring Synchrotron (MR) ☆ Facility at J-PARC ▼ Materials and Life Science Facility (from 3 GeV RCS) ▼ Nuclear and Particle Physics Experimental Hall (from 50 GeV MR) ▼ Neutrino Facility (from 50 GeV MR) 3 GeV RCS 3 GeV RCS ☆ 1MW @ 3 GeV RCS 6 times at ISIS as Neutron S ource ☆ 0.75 MW @ 50 GeV MR 5 times at AGS as Proton/Se cond Particle Source Increasing attention to MR fr om region of Nuclear-Particle Physics J-PARC RCS J-PARC MR BNL AGS Injection Energy [Ge V] 0.4 (0.181) 3.0 1.2 Extraction Energy [Ge V] 3.0 50 (30) 24 Particle per Pulse [10^13] 8.3 (5.0) 33 (20) 6.0 Repetition Rate [Hz] 25 0.2 – 0.3 0.5 Average Current [μA] 333 (200) 15 (9) 6 Beam Power [MW] 1.0 (0.6) 0.75 (0.27) 0.14 Table. Parameters of J-PARC Rings and BNL AGS Frontier of High Frontier of High Intensity Intensity Major Sources of beam loss • Betatron tune shift from space cha rge effect • Increasing nonlinear field compone nts from large aperture magnets • Interference of fringe fields bet ween magnets The total acceptable beam loss rate at RCS is less than 10 -3 (1kW) and RCS has many sources of beam loss caused by high intensity. If total beam loss exceeds 1W/m except for the collimator region, it is impossible to do maintenance of activated elements in the ring. Therefore, we need to a void excess beam loss with 1MW high intensity beam. However, we cannot justify a suitable parameter set of all elements with only experience beca use we must consider the sources of beam loss with nonlinear components. So, it is very important to have a tool with a complex calculation. The tool based on beam dynamics and simulation should be used to find inputting error of the setting value and to judge whether the setting value of magnets is justified or not. Abstract : Abstract : We have developed a Virtual Accelerator at 3 GeV Rapid Cycling Synchrotron (RCS) in J-PARC. It has a simulator of beam in the complicated acceler ator and is put out under the control server as well as a real machine. It is possible to do a dry run without beam, and consequently gives a stro ng feedback for the RCS operation as a commissioning tool. Therefore, we can examine the control system for the real machine and practice the comm issioning of the real machine by using the Virtual Accelerator. It is important to have the tool based on beam dynamics for the performance gain o f an accelerator. Consequently, it will lead a physics run for experiments of the science at the J-PARC to success or a better run. We present the concept of the control system including the Virtual Accelerator and construction of itself. Presented by Nagamiya Director at ATAC’06 J-PARC Modeling of Virtual Modeling of Virtual Accelerator Accelerator We have implemented the elements into VA, for modeling of a real machine. * Magnets This is the element for deflecting, focusing, defocusing and correction etc. Beam is given a kick by main component field, higher order nonlinear fields and fringe field. * RF Cavity This is the element for increasing and decreasing energy. Beam is given an energy by gap voltage. * Exciter This is the element for excitation of the beam transverse oscillation. * Beam Position Monitor (BPM) This is the monitor for getting the transverse beam position and have a finite resolution σ. A dry run on Virtual A dry run on Virtual Accelerator Accelerator We have created the preliminary OPI to measure the basic parameters an d have virtually measured the parameters on VA for the storage mode in the commissioning phase at 3 GeV RCS. We introduce the OPI and the resu lt of measurement of betatron tune by a dry run, for example. OPI for measurement of betatron tune A common method to measure betat ron tune 1.Excite transverse beam motion by exciter 2.Detect the transverse beam pos ition 3.Do frequency analysis by FFT operate the Exciter To log the Tune X & Y plot the result FFT and search the tune peak Summary : Summary : We have developed a Virtual Accelerator based on EPICS at 3 GeV Rapid Cycli ng Synchrotron (RCS) in J-PARC. This is expected as a tool to give a strong feedback to a real machine and avoid beam loss over the acceptable one. It i s important to have the tool in high intensity proton machine such as RCS. T he Virtual Accelerator built into the same control system with a real machin e is possible to do a dry run without a beam and examine the operation or co mmissioning algorithm before it is actually executed in a real machine. We have implemented some elements into Virtual Accelerator, for modeling of a real machine. Additionally, we have been successful to build it into contr ol system. We have had a virtually operation and measure basic parameters on Virtual Accelerator for the storage mode in the commissioning stage at the 3 GeV RCS. In the future, we have tasks to be improved in order to conform to a real m achine and operate it in a real time. It is to add an space charge effect an d acceleration process to Virtual Accelerator, and to speed up the calculat The total acceptable beam loss rate < 10 -3 (1kW) → extremely lower than that of usual accelerators Operation Interface (OPI) Control server with runtime database (EPICS IOCs) Real Accelerator Magnets RF Monitors Errors Virtual Accelerator Magnets RF Monitors Errors OPI (Operation Interface) : • The control terminal to control the elemen ts, such as Magnets, RF cavity and Monitors EPICS (Experimental Physics and Indu strial Control System) : •A set of Open Source software tools, librar ies and applications •Creation of distributed soft real-time cont rol systems for scientific instruments such as a particle accelerators etc • Use of Client/Server and Publish/Subscribe techniques to communicate between various co mputers • The control server called IOCs including r untime database •Input and Output to IOCs using the Cannel A ccess (CA) network protocol. We develop the control system for an accelerator added Virtual Acce lerator (VA) at 3 GeV RCS in J-PARC. The VA is a simulator of beam i n the complicated accelerator based on beam dynamics, for simulation of the beam behavior in the ring. The targeted control system is sho wn in the flow chart. Flow chart of the control system for an accelerator based on Virtual Accelerator Concept of Virtual Concept of Virtual Accelerator Accelerator We put VA modeled a real machine out under the IOCs based on EPICS and o perate VA like a real machine. This is a originality control model. It is shown advantage of this model in the following below. Advantage of the control model with VA : ＊ Give a strong online feedback based on beam dynamics ＊ Judge whether setting parameters are justified or not ＊ Examine the control system of the machine ＊ Practice commissioning of the machine Construction of Control System including Virtual Construction of Control System including Virtual Accelerator Accelerator OPI IOCs VA Input setting value to magnets etc Get beam position from monitors A basic control system for Virtual Accelerator We have constructed the control sy stem of VA through control server. It is possible to operate VA like a real machine from OPI through IOCs. OPI → SAD TkInter developed by KEK IOCs → EPICS toolkit developed by c ollaboration VA → Virtual Accelerator Input setting value to magnets etc Get beam position from monitors The VA is input setting value of elements through IOCs and run a simu lation with particles tracking calculation. As the result, OPI gets be am position on monitors through IOCs. ● ： Existing ▲ ： Under commissioning or construction ▲ ▲ ▲ SNS This Project 3GeV This Project 50GeV Powe r Materials- Life Sciences Nuclear- Particle Physics 1 MW 0.1 MW
description
▲. SNS. Operation Interface (OPI). Control server with runtime database (EPICS IOCs). Real Accelerator Magnets RF Monitors Errors. Virtual Accelerator Magnets RF Monitors Errors. Virtual Accelerator at J-PARC 3 GeV Rapid Cycling Synchrotron. - PowerPoint PPT Presentation
Transcript of Virtual Accelerator at J-PARC 3 GeV Rapid Cycling Synchrotron
Virtual Accelerator at J-PARC 3 GeV Rapid Cycling SynchrotronVirtual Accelerator at J-PARC 3 GeV Rapid Cycling SynchrotronH. Harada*, K. Shigaki (Hiroshima University in Japan), H. Hotchi, F. Noda, H. Sako, H. Suzuki, Y. Irie (JAEA in Japan),
K. Furukawa (KEK in Japan), S. Machida (CCLRC RAL in UK)
* 1st Author : Hiroyuki Harada, Email : [email protected]
J-PARC FacilityJ-PARC Facility
☆ Accelerators at J-PARC
▼ 400 MeV (181 MeV at phase-1) LINAC
▼ 3 GeV 25 Hz Rapid Cycling Synchrotron (RCS)
▼ 50 GeV Main Ring Synchrotron (MR)
☆ Facility at J-PARC
▼ Materials and Life Science Facility (from 3 GeV RCS)
▼ Nuclear and Particle Physics Experimental Hall (from 50 GeV MR)
▼ Neutrino Facility (from 50 GeV MR)
3 GeV RCS3 GeV RCS
☆ 1MW @ 3 GeV RCS
6 times at ISIS as Neutron Source
☆ 0.75 MW @ 50 GeV MR
5 times at AGS as Proton/Second Particle Source
Increasing attention to MR from region of Nuclear-Particle Physics
J-PARC RCS J-PARC MR BNL AGS
Injection Energy [GeV] 0.4 (0.181) 3.0 1.2
Extraction Energy [GeV] 3.0 50 (30) 24
Particle per Pulse [10^13] 8.3 (5.0) 33 (20) 6.0
Repetition Rate [Hz] 25 0.2 – 0.3 0.5
Average Current [μA] 333 (200) 15 (9) 6
Beam Power [MW] 1.0 (0.6) 0.75 (0.27) 0.14
Table. Parameters of J-PARC Rings and BNL AGS
Frontier of High IntensityFrontier of High Intensity
Major Sources of beam loss
• Betatron tune shift from space charge effect
• Increasing nonlinear field components from large aperture magnets
• Interference of fringe fields between magnets
The total acceptable beam loss rate at RCS is less than 10-3 (1kW) and RCS has many sources of beam loss caused by high intensity. If total beam loss exceeds 1W/m except for the collimator region, it is impossible to do maintenance of activated elements in the ring. Therefore, we need to avoid excess beam loss with 1MW high intensity beam. However, we cannot justify a suitable parameter set of all elements with only experience because we must consider the sources of beam loss with nonlinear components. So, it is very important to have a tool with a complex calculation. The tool based on beam dynamics and simulation should be used to find inputting error of the setting value and to judge whether the setting value of magnets is justified or not.
Abstract :Abstract : We have developed a Virtual Accelerator at 3 GeV Rapid Cycling Synchrotron (RCS) in J-PARC. It has a simulator of beam in the complicated accelerator and is put out under the control server as well as a real machine. It is possible to do a dry run without beam, and consequently gives a strong feedback for the RCS operation as a commissioning tool. Therefore, we can examine the control system for the real machine and practice the commissioning of the real machine by using the Virtual Accelerator. It is important to have the tool based on beam dynamics for the performance gain of an accelerator. Consequently, it will lead a physics run for experiments of the science at the J-PARC to success or a better run. We present the concept of the control system including the Virtual Accelerator and construction of itself.
Presented by Nagamiya Director at ATAC’06
J-PARC
Modeling of Virtual AcceleratorModeling of Virtual Accelerator
We have implemented the elements into VA, for modeling of a real machine.
* Magnets
This is the element for deflecting, focusing, defocusing and correction etc. Beam is given a kick by main component field, higher order nonlinear fields and fringe field.
* RF Cavity
This is the element for increasing and decreasing energy. Beam is given an energy by gap voltage.
* Exciter
This is the element for excitation of the beam transverse oscillation.
* Beam Position Monitor (BPM)
This is the monitor for getting the transverse beam position and have a finite resolution σ.
A dry run on Virtual AcceleratorA dry run on Virtual Accelerator
We have created the preliminary OPI to measure the basic parameters and have virtually measured the parameters on VA for the storage mode in the commissioning phase at 3 GeV RCS. We introduce the OPI and the result of measurement of betatron tune by a dry run, for example.
OPI for measurement of betatron tune
A common method to measure betatron tune
1. Excite transverse beam motion by exciter
2. Detect the transverse beam position
3. Do frequency analysis by FFT
operate the Exciter
To log the Tune X & Y
plot the result FFT and search the tune peak
Summary :Summary :
We have developed a Virtual Accelerator based on EPICS at 3 GeV Rapid Cycling Synchrotron (RCS) in J-PARC. This is expected as a tool to give a strong feedback to a real machine and avoid beam loss over the acceptable one. It is important to have the tool in high intensity proton machine such as RCS. The Virtual Accelerator built into the same control system with a real machine is possible to do a dry run without a beam and examine the operation or commissioning algorithm before it is actually executed in a real machine.
We have implemented some elements into Virtual Accelerator, for modeling of a real machine. Additionally, we have been successful to build it into control system. We have had a virtually operation and measure basic parameters on Virtual Accelerator for the storage mode in the commissioning stage at the 3 GeV RCS.
In the future, we have tasks to be improved in order to conform to a real machine and operate it in a real time. It is to add an space charge effect and acceleration process to Virtual Accelerator, and to speed up the calculation.
The total acceptable beam loss rate < 10-3 (1kW)
→ extremely lower than that of usual accelerators
Operation Interface(OPI)
Control server with runtime database (EPICS IOCs)
Real AcceleratorMagnets
RFMonitors
Errors
Virtual AcceleratorMagnets
RFMonitors
Errors
OPI (Operation Interface) :
• The control terminal to control the elements, such as Magnets, RF cavity and Monitors
EPICS (Experimental Physics and Industrial Control System) :
•A set of Open Source software tools, libraries and applications
•Creation of distributed soft real-time control systems for scientific instruments such as a particle accelerators etc
• Use of Client/Server and Publish/Subscribe techniques to communicate between various computers
• The control server called IOCs including runtime database
•Input and Output to IOCs using the Cannel Access (CA) network protocol.
We develop the control system for an accelerator added Virtual Accelerator (VA) at 3 GeV RCS in J-PARC. The VA is a simulator of beam in the complicated accelerator based on beam dynamics, for simulation of the beam behavior in the ring. The targeted control system is shown in the flow chart.
Flow chart of the control system for an accelerator based on Virtual Accelerator
Concept of Virtual AcceleratorConcept of Virtual Accelerator
We put VA modeled a real machine out under the IOCs based on EPICS and operate VA like a real machine. This is a originality control model. It is shown advantage of this model in the following below.
Advantage of the control model with VA :
＊ Give a strong online feedback based on beam dynamics
＊ Judge whether setting parameters are justified or not
＊ Examine the control system of the machine
＊ Practice commissioning of the machine
Construction of Control System including Virtual AcceleratorConstruction of Control System including Virtual Accelerator
OPI
IOCs
VA
Input setting value to magnets etc
Get beam position from monitors
A basic control system for Virtual Accelerator
We have constructed the control system of VA through control server. It is possible to operate VA like a real machine from OPI through IOCs.
OPI → SAD TkInter developed by KEK
IOCs → EPICS toolkit developed by collaboration
VA → Virtual Accelerator
Input setting value to magnets etc
Get beam position from monitors
The VA is input setting value of elements through IOCs and run a simulation with particles tracking calculation. As the result, OPI gets beam position on monitors through IOCs.
● ： Existing ▲ ： Under commissioning or construction
▲
▲
▲ SNS
This Project 3GeV
This Project 50GeV
Power
Materials-Life Sciences
Nuclear-Particle Physics
1 MW
0.1 MW
