1 Virtual Accelerator plan and Virtual Accelerator plan and status at RCS status at RCS Hiroshima University, Graduate School of Science Experimental Quark Physics Lab ( & JAEA Accelerator Development Group ) Hiroyuki Harada MR/RCS beam commissioning meeting in KEK Oct. 25th (Tues), 2005 Web page of my work: http://nacci.tokai.jaeri.go.jp/~harada/index.html
Virtual Accelerator plan and status at RCS. Web page of my work: http://nacci.tokai.jaeri.go.jp/~harada/index.html. Hiroshima University, Graduate School of Science Experimental Quark Physics Lab ( & JAEA Accelerator Development Group ) Hiroyuki Harada - PowerPoint PPT Presentation
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Virtual Accelerator plan and status Virtual Accelerator plan and status at RCSat RCS
Hiroshima University, Graduate School of Science
Experimental Quark Physics Lab
(& JAEA Accelerator Development Group)Hiroyuki Harada
MR/RCS beam commissioning meeting in KEK
Oct. 25th (Tues), 2005
Web page of my work: http://nacci.tokai.jaeri.go.jp/~harada/index.html
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Plan for virtual accelerator
1. Estimation of the best K value of each magnet from matching by simulation code
2. Estimation of the measurement method of each parameter and the beam & elements condition from the monitor's signal by the tracking. → Reflection to real measurement.
Operation panel with GUIOperation panel with GUIThe signal of each monitor
Start virtual operation
Real Accelerator Virtual Accelerator
the signal of each monitor
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Plan 1 ~ operation and matching
• Matching will be carried out by SAD, but maybe switch to JAD in the future.
• Operation panel with GUI for commissioning will be created by JAD (script by java based SAD) until the comprehensive examination of RCS around Dec. 2006.
• The GUI operation panels for each operating mode and scenario will be created.
• This will carry out COD correction and search of the best K1 tune by tune, etc.
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Sample GUI by KBFrame
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Plan 2 ~ examination of measurement method of each
parameter by VA
• The measurement of the tune (now in progress)
• The measurement of the chromaticity (now in progress)
• The measurement of the dispersion function
• The measurement of the Beta function
• The measurement of all other parameters
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Plan 3 ~ estimation of beam loss
• The estimation of the beam loss will be calculated by MARS, using the results from the tracking by Simpsons.
• The other thing than those above is unknown yet.
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Status for VA• VA system via EPICS PCAS
- Preliminary system was created.
• System to create the input files for simulation code from DB
- Trace3D, SAD, MAD and XAL only QM and BM was created by Sako-san.
• Examination of measurement method for each parameter
- Measurement for tune and chromaticity is now in progress.
• Integration of simulation codes (SAD, Simpsons and MARS)
- The communication between EPICS and Simpsons is now in progress.
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The construction of system~ The control system of simulation code via EPICS PCAS
GUI Operation panel (by KBFrame)
EPICS PCAS
Simulator
K1 valueMonitor signal
K1 value
Figure. A created the sample operation panel with GUI
Monitor signal
EPICS : Experimental Physics and Industrial Control System
PCAS : Portable Channel Access Server
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Fourier transform
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Measurement of the tune• For the beam condition,
εx, y : 216 pi mmmrad Number of particles : 4800 Spread of the dp/p : 1% Length of the bunch : about 83 m Non space charge Non fluctuation of the BPMs
Side band by Synchrotron Oscillation
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The location of the exciters at RCS
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The exciter at RCS
d
ZPEx
Expc
eLrms
)1
1(
RCS
L (m) 0.81
p (GeV/c) 0.61 → 3.82
Z (Ω) 100
P (W) 1000
d (m) 0.509
1
]2cos[2
0
1
0 0
'
Nj
nN
x
j
N
jj
jrmsn
rad
rms
267.110267.1
509.0
1000100)
713.0
11(
10954.0
81.0
6
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Table. The parameters of RCS-Exciter
θrms is the kick-angle by the exciter, p is the beam momentum, β is Lorenz beta, c is the speed of light, P is the power supplied from the amp, d is the length of electrode plate, Ex is the electric field.
The exciter gives the beam the kick with Δx’ at a point in RCS ring turns by turns.
The frequency spectrum of the exciter is the band-limited white noise of the frequency width with ΔΩ, Ωj is the frequency, φj is the random initial phase, N is the number of the spectrum that the amplitude is constant.
Figure. The white noise of simulated RCS-Exciter
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Measurements of the Chromaticity
RF frequency Δf vs dp/p The right figure shows that a change of the RF frequency makes the dp/p of the beam a fluctuation. The chromaticity is gotten by the measurement of Δν for each dp/p (or the RF frequency).
Chromaticity :ξ = Δν/ Δp/p
It seems that the RF in SAD is not right when the RF frequency is changed. So, the RF is under examination. If the RF has a buggy behavior, I will simulate the RF by using the other code.
task
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The time schedule of VA at RCS
2006 2007
Submission of my thesis
now
the comprehensive examination at RCS
Start of the beam commissioning at RCS
the completion of the operation panel with GUI by JAD
The communication between EPICS and Simpsons will be done. The main code of the tracking replace SAD to Simpsons.
Start to create the operation panel with GUI by JAD
Start to create the scenario for the commissioning at RCS
The coordination of the connection between EPICS and the operation panel with GUI by JAD