Author: Zhang, H.
Paper Title Page
MOPAB004 JSPEC - A Simulation Program for IBS and Electron Cooling 49
 
  • H. Zhang, S.V. Benson, M.W. Bruker, Y. Zhang
    JLab, Newport News, Virginia, USA
 
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
In­tra­beam scat­ter­ing is an im­por­tant col­lec­tive ef­fect that can de­te­ri­o­rate the prop­er­ties of a high-in­ten­sity beam, and elec­tron cool­ing is a method to mit­i­gate the IBS ef­fect. JSPEC (JLab Sim­u­la­tion Pack­age for Elec­tron Cool­ing) is an open-source pro­gram de­vel­oped at Jef­fer­son Lab, which sim­u­lates the evo­lu­tion of the ion beam under the IBS and/or the elec­tron cool­ing ef­fect. JSPEC has been bench­marked with BE­TA­COOL and ex­per­i­men­tal data. In this re­port, we will in­tro­duce the fea­tures of JSPEC, in­clud­ing the fric­tion force cal­cu­la­tion, the IBS ex­pan­sion rate and elec­tron cool­ing rate cal­cu­la­tion, and the beam-dy­namic sim­u­la­tions for the elec­tron cool­ing process; ex­plain how to set up the sim­u­la­tions in JSPEC; and demon­strate the bench­mark­ing re­sults.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB004  
About • paper received ※ 19 May 2021       paper accepted ※ 21 May 2021       issue date ※ 27 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPAB177 Simulating Magnetized Electron Cooling for EIC with JSPEC 1813
 
  • S.J. Coleman, D.L. Bruhwiler, B. Nash, I.V. Pogorelov
    RadiaSoft LLC, Boulder, Colorado, USA
  • H. Zhang
    JLab, Newport News, Virginia, USA
 
  We pre­sent a pos­si­ble elec­tron cool­ing con­fig­u­ra­tion for the pro­posed Elec­tron Ion Col­lider (EIC) fa­cil­ity, de­vel­oped using a Nelder-Mead Sim­plex op­ti­miza­tion pro­ce­dure built into JSPEC, an elec­tron cool­ing code de­vel­oped at Jef­fer­son Lab. We show the time evo­lu­tion of the emit­tance of the ion beam in the pres­ence of this cooler eval­u­ated as­sum­ing the ion dis­tri­b­u­tion re­mains Gauss­ian. We also show that bi-gauss­ian dis­tri­b­u­tions emerge in sim­u­la­tions of ion macro-par­ti­cles. We show how in­tra-beam scat­ter­ing can be treated with a core-tail model in sim­u­la­tions of ion macro-par­ti­cles. The Sirepo/JSPEC* and Sirepo/Jupyter** apps will be pre­sented, with in­struc­tions en­abling the com­mu­nity to re­pro­duce our sim­u­la­tions.
* https://www.sirepo.com/jspec
** https://www.sirepo.com/jupyter
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB177  
About • paper received ※ 19 May 2021       paper accepted ※ 15 June 2021       issue date ※ 16 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPAB181 Demonstration of Electron Cooling using a Pulsed Beam from an Electrostatic Electron Cooler 1827
 
  • M.W. Bruker, S.V. Benson, A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, T. Satogata, A.V. Sy, H. Wang, S. Wang, H. Zhang, Y. Zhang
    JLab, Newport News, Virginia, USA
  • J. Li, F. Ma, X.M. Ma, L.J. Mao, X.P. Sha, M.T. Tang, J.C. Yang, X.D. Yang, H.W. Zhao
    IMP/CAS, Lanzhou, People’s Republic of China
  • H. Zhao
    BNL, Upton, New York, USA
 
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
Elec­tron cool­ing con­tin­ues to be an in­valu­able tech­nique to re­duce and main­tain the emit­tance in hadron stor­age rings in cases where sto­chas­tic cool­ing is in­ef­fi­cient and ra­dia­tive cool­ing is neg­li­gi­ble. Ex­tend­ing the en­ergy range of elec­tron cool­ers be­yond what is fea­si­ble with the con­ven­tional, elec­tro­sta­tic ap­proach ne­ces­si­tates the use of RF fields for ac­cel­er­a­tion and, thus, a bunched elec­tron beam. To ex­per­i­men­tally in­ves­ti­gate how the rel­a­tive time struc­ture of the two beams af­fects the cool­ing prop­er­ties, we have set up a pulsed-beam cool­ing de­vice by adding a syn­chro­nized puls­ing cir­cuit to the con­ven­tional elec­tron source of the CSRm cooler at In­sti­tute of Mod­ern Physics *. We show the ef­fect of the elec­tron bunch length and lon­gi­tu­di­nal ion fo­cus­ing strength on the tem­po­ral evo­lu­tion of the lon­gi­tu­di­nal and trans­verse ion beam pro­file and demon­strate the detri­men­tal ef­fect of tim­ing jit­ter as pre­dicted by the­ory and sim­u­la­tions. Com­pared to ac­tual RF-based cool­ers, the sim­plic­ity and flex­i­bil­ity of our setup will fa­cil­i­tate fur­ther in­ves­ti­ga­tions of spe­cific as­pects of bunched cool­ing such as syn­chro-be­ta­tron cou­pling and phase dither­ing.
* M. W. Bruker et al., Phys. Rev. Accel. Beams 24, 012801 (2021)
 
poster icon Poster TUPAB181 [3.699 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB181  
About • paper received ※ 19 May 2021       paper accepted ※ 15 June 2021       issue date ※ 21 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)