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Transverse broadband impedance reduction techniques in a heavy ion accelerator
/ Chen, X Q (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS ; Unlisted, CN) ; Zhu, G Y (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Caspers, F (CERN) ; Yang, J C (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Wu, J X (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Shen, G D (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Liu, J (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Xia, J W (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Zhang, Y (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) ; Ruan, S (Lanzhou, Inst. Modern Phys. ; Unlisted, CN) et al.
The transverse broadband impedances of major components in the BRing (booster ring) of HIAF (High Intensity Heavy-ion Accelerator Facility) are estimated using the analytical formulas or the wakefield solver in the CST Studio Suite. At low frequency, the transverse broadband impedance model of BRing is Z1H(ω)=-417.14i kΩ/m(horizontal) and Z1V(ω)=-530.19i kΩ/m(vertical), which are larger than the threshold impedance for the transverse mode-coupling instability. [...]
2020 - 9 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 034402
Fulltext: PDF;
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Stochastic cooling experiments for CSRe at IMP
/ Zhu, G.Y. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS ; Huizhou Research Center of Ion Sciences) ; Wu, J.X. (Lanzhou, Inst. Modern Phys.) ; Caspers, F. (CERN) ; e, F. Nolden ; Zhang, Y. ; Wei, Y. ; Hu, X.J. ; Du, Z. ; Xie, H.M. ; Jing, L. et al.
A novel type of perforated travelling wave pick-up/kicker structure was developed for CSRe stochastic cooling which was originally proposed by F.Caspers at CERN. The simulated and measured results of shunt impedance of the slotted travelling wave pickup electrode are in reasonable agreement. [...]
2019
- Published in : Nucl. Instrum. Meth. A 932 (2019) 83-89
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Performance of the resonant Schottky pickup at CSRe
/ Wua, J X (Lanzhou, Inst. Modern Phys.) ; Zang, Y.D. (Lanzhou, Inst. Modern Phys.) ; Nolden, F. (Darmstadt, GSI) ; Sanjari, M.S. (Darmstadt, GSI) ; Hülsmann, P. (Darmstadt, GSI) ; Caspers, F. (CERN) ; Zhao, T.C. (Lanzhou, Inst. Modern Phys.) ; Li, M. (Lanzhou, Inst. Modern Phys.) ; Zhang, J.Z. (Lanzhou, Inst. Modern Phys.) ; Li, J. (Lanzhou, Inst. Modern Phys.) et al.
For a bunched beam, the signals on pickups are coherent, providing a signal power proportional to the square of the number of particles. For a coasting beam the individual particle signals have a random phase; therefore, the overall signal is proportional to the particle number N. [...]
CERN-ACC-2014-0040.-
Geneva : CERN, 2013 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 317 (2013) 623-628
Preprint: PDF;
In : 16th International Conference on Electromagnetic Isotope Separators and Techniques Related to their Applications, Matsue, Japan, 2 - 7 Dec 2012, pp.623-628
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A Novel Type of Forward Coupler Slotted Stripline Pickup Electrode for CSRE Stochastic Cooling
/ Wu, J X (IMP, Lanzhou) ; Zhang, Y (IMP, Lanzhou) ; Zhu, G Y (IMP, Lanzhou) ; Li, M (IMP, Lanzhou) ; Hu, X J (IMP, Lanzhou) ; Xia, J X (IMP, Lanzhou) ; Yang, J C (IMP, Lanzhou) ; Caspers, F (CERN)
A novel type of 2.76 m long slotted, or perforated, strip-line pick-up, or kicker electrode structure, for CSRe stochastic cooling of non-relativistic particle beams with β~ 0.7 is presented. It is installed inside a bending vacuum chamber with the output signal taken from the downstream end. [...]
CERN-ACC-2013-0183.-
Geneva : CERN, 2013 - 3 p.
Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.571
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Electroweak Measurements in Electron-Positron Collisions at W-Boson-Pair Energies at LEP
/ ALEPH Collaboration
Electroweak measurements performed with data taken at the electron-positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3~fb$^{-1}$ collected by the four LEP experiments ALEPH, DELPHI, L3 and OPAL, at centre-of-mass energies ranging from $130~GeV$ to $209~GeV$ [...]
arXiv:1302.3415; CERN-PH-EP-2013-022; CERN-PH-EP-2013-022.-
Geneva : CERN, 2013 - 126 p.
- Published in : Phys. Rep. 532 (2013) 119-244
Draft (restricted): PDF; Fulltext: CERN-PH-EP-2013-022 - PDF; arXiv:1302.3415 - PDF; External link: Preprint
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Search for Charged Higgs bosons: Combined Results Using LEP data
/ ALEPH, DELPHI, L3 and OPAL Collaborations
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for pair-produced charged Higgs bosons in the framework of Two Higgs Doublet Models (2HDMs). The data of the four experiments are statistically combined. [...]
arXiv:1301.6065; CERN-PH-EP-2012-369; CERN-PH-EP-2012-369; LHWG-Note-2012-01; ALEPH-2012-001-PHYSICS-2012-001; DELPHI-2012-001-PHYS-953; L3-Note-2835; OPAL-PR433.-
Geneva : CERN, 2013 - 18 p.
- Published in : Eur. Phys. J. C 73 (2013) 2463
Draft (restricted): PDF; Fulltext: CERN-PH-EP-2012-369 - PDF; arXiv:1301.6065 - PDF; External link: Preprint
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Isotopic Composition of Light Nuclei in Cosmic Rays: Results from AMS-01
/ AMS-01 Collaboration
The variety of isotopes in cosmic rays allows us to study different aspects of the processes that cosmic rays undergo between the time they are produced and the time of their arrival in the heliosphere. In this paper, we present measurements of the isotopic ratios $^2$H/$^4$He, $^3$He/$^4$He, $^6$Li/$7$Li, $7$Be/($^9$Be+$^{10}$Be), and $^{10}$B/$^{11}$B in the range 0.2-1.4 GeV of kinetic energy per nucleon. [...]
arXiv:1106.2269.-
2011 - 12 p.
- Published in : Astrophys. J. 736 (2011) 105
Fulltext: PDF; External link: Preprint
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