Author: Meng, C.
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MOPRI090 Beam Distribution Transformation with SFMs at 3MeV C-ADS Beamline 824
 
  • H. Geng, P. Cheng, C. Meng, S. Pei, B. Sun, H.J. Wang, B. Xu, F. Yan, Y.L. Zhao
    IHEP, Beijing, People's Republic of China
 
  The C-ADS project is building a test facility at the Institute of High Energy Physics. The design goal of the test facility is 10MeV beam energy with a continuous beam current of 10mA. To sustain the 100kW CW beam power at the beam dump, a beam distribution transform system is designed. The Step Field Magnets (SFMs) are used to transform the beam distribution from Gaussian to uniform. In this test stand, two sets of SFMs will be employed to manipulate the beam distribution. At the first commissioning stage, the bump dump line will be connected to the Medium Energy Beam Transport-1 (MEBT1) to test the beam manipulation scheme. The design and error analysis of this 3MeV beam dump line will be discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRI090  
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THPRO112 Beam Dynamics Analysis in the Beam Halo Experiments at IHEP 3159
 
  • H. Jiang, S. Fu, C. Meng, J. Peng, Y. Zou
    IHEP, Beijing, People's Republic of China
 
  We have measured the beam parameters properly, and also found the RMS matched beam. Now we simulate the matched beam and the mismatched beam using the IMPACT and TraceWin code. We find the simulations can succeed to reproduce the beam profiles without halo for both matched and mismatched beam, but there are some differences for the beam with halo.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRO112  
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THPME020 Local Compensation-rematch for the C-ADS Accelerator Element Failures with Space Charge 3259
SUSPSNE040   use link to see paper's listing under its alternate paper code  
 
  • B. Sun, C. Meng, J.Y. Tang, F. Yan
    IHEP, Beijing, People's Republic of China
 
  In order to achieve the required reliability and availability for the C-ADS accelerator, a fault tolerance design is pursued. The effects of cavity and solenoid failure in different locations have been studied and the schemes of compensation by means of local compensation have been investigated. After one cavity failure, by adjusting the settings of the neighbouring cavities and the focusing elements we can make sure that the Twiss parameters and energy are approximately recovered to that of the nominal ones at the matching point. However, the compensation work above is based on the TraceWin code, which has not considered the phase compensation, a code based on MATLAB is under developing to compensate the arrival time at the matching point that the linear space charge effect has also considered.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME020  
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THPME021 Designs of High-intensity Proton Linacs with Non-equipartitioning 3262
 
  • C. Meng, Z. Li, S. Pei, B. Sun, J.Y. Tang, F. Yan
    IHEP, Beijing, People's Republic of China
  • R. Garoby, F. Gerigk, A.M. Lombardi
    CERN, Geneva, Switzerland
 
  Superconducting technology is playing more and more important roles in high-power proton linacs. Periodic phase advance less than 90 degrees and equipartitioning design are considered very important principles in linac design. Due to the very high construction and operation costs, it is very important in optimizing the design to lower the costs. In usual, the longitudinal emittance is larger from the front-end, thus the transverse phase advance is designed to have a larger value. However, with the technical advancement, higher accelerating field can be obtained. In order to take this advantage, it is of much interest in increasing the longitudinal phase advance to shorten the linac or reduce the cost. In this paper, we present the design method that keeping the longitudinal phase advance as large as possible but smaller than 90 degree to maximize the use of the available accelerating gradient. Even though this method does not observe the equipartitioning condition, we can also obtain very good beam dynamics results by placing the tunes in resonant-free regions. In this paper, the design and simulation results by applying this method to the SPL and China-ADS linac will be present.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME021  
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THPME138 Dynamic Comparison With XAL and Tracewin Based on the Injector-I of China ADS Test Stand 3572
 
  • Y.L. Zhao, P. Cheng, H. Geng, C. Meng, S. Pei, B. Sun, H.J. Wang, B. Xu, F. Yan
    IHEP, Beijing, People's Republic of China
 
  The injector scheme I (injector-I) of China ADS test stand is a superconducting Linac which accelerates 10mA beam to 3.2MeV, 5MeV, 10MeV, and then transports it to the dump. The dump line is designed to meet the requirement of beam expansion at the three different energies. The XAL from SNS was selected for the commissioning of China ADS. Because the beam current is so high, the nonlinear space charge force cannot be omitted. As we know, XAL calculates the space charge force with linear resolver. So, whether it could display the beam exactly enough is an important issue to consider. As a preparation for beam commissioning, the virtual accelerator in XAL frame was built and tested. Here in this paper, the envelopes of the 5MeV and 10MeV lattices from general XAL mpx application are shown and compared with the multiparticle tracking code TraceWin.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME138  
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THPME139 Emittance Measurement with Wire Scanners at CADS MEBT1 3575
 
  • H. Geng, P. Cheng, C. Meng, S. Pei, B. Sun, H.J. Wang, B. Xu, F. Yan, Y.L. Zhao
    IHEP, Beijing, People's Republic of China
 
  The C-ADS project has started beam commissioning. The ion source and LEBT has been commissioned successfully, while the RFQ is under conditioning. The Medium Energy Beam Transport line-1 (MEBT) is the place where extensive beam parameter measurement will be carried out. Beam emittance is one of the most critical parameters which have to characterized. In the C-ADS injector-I, the MEBT-1 has installed three wire scanners to measure the beam sizes. The transverse emittance measurement method using the wire scanners will be discussed in detail in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME139  
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