Author: Berg, J.S.
Paper Title Page
TUPAF09 Multi Pass Energy Recovery Linac Design With a Single Fixed Field Magnet Return Line 191
 
  • D. Trbojevic, J.S. Berg, S.J. Brooks, F. Méot, N. Tsoupas
    BNL, Upton, Long Island, New York, USA
  • W. Lou
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  We pre­sent a new ap­proach of the En­ergy Re­cov­ery Linac De­sign for the fu­ture pro­jects: PERLE (Pow­er­ful En­ergy Re­cov­ery Linac for Ex­per­i­ments), LHeC/FCCeH and eR- HIC. The con­cept uses su­per­con­duct­ing linacs and a sin­gle xed eld beam line with mul­ti­ple en­ergy passes of elec­tron beams. This rep­re­sents an up­date to the ex­ist­ing CBETA (Cor­nell Uni­ver­sity Brookhaven Na­tional Lab­o­ra­tory ERL Test Ac­cel­er­a­tor) where the su­per­con­duct­ing linac uses a sin­gle xed eld mag­net beam line with four en­ergy passes dur­ing ac­cel­er­a­tion and four passes dur­ing the en­ergy re­cov- ery. To match the sin­gle xed eld beam line to the linac the CBETA uses the spread­ers and com­bin­ers on both sides of the linac, while the new con­cept elim­i­nates them. The arc cells from the sin­gle xed eld beam line are con­nected to the linac with adi­a­batic tran­si­tion arcs wher cells in­crease in length. The or­bits of di erent en­er­gies merge into a sin- gle orbit through the in­ter­leaved linac within the straight sec­tions as in the CBETA pro­ject. The be­ta­tron func­tions from the arcs are matched to the linac. The time of ight of di erent elec­tron en­er­gies is cor­rected for the cen­tral or­bits by ad­di­tional cor­rec­tion mag­net con­trolled in­duced beam os­cil­la­tions.  
slides icon Slides TUPAF09 [3.935 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-TUPAF09  
About • paper received ※ 22 October 2018       paper accepted ※ 27 January 2019       issue date ※ 26 January 2019  
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TUPAF10 Experience With CBETA Online Modeling Tools 196
 
  • C.M. Gulliford, A.C. Bartnik, J. Dobbins, D. Sagan
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • J.S. Berg
    BNL, Upton, Long Island, New York, USA
  • A. Nunez-delPrado
    UCF, Orlando, USA
  
  Funding: NYSERDA, the New York StateEnergy Research and Development Agency
The Cor­nell-Brookhaven CBETA ma­chine is a four pass En­ergy Re­cov­ery Linac (ERL) with a Non-scal­ing Fixed-Field Al­ter­nat­ing gra­di­ent (NS-FFA) arc. For on­line mod­el­ing of sin­gle par­ti­cle dy­nam­ics in CBETA, a cus­tomized ver­sion of the Tao pro­gram, which is based upon the Bmad toolkit, has been de­vel­oped. This on­line pro­gram, called CBETA-V, is in­ter­faced to CBETA’s EPICS con­trol sys­tem. This paper de­scribes the on­line mod­el­ing sys­tem and ini­tial ex­pe­ri­ence dur­ing ma­chine run­ning. 		 
slides icon Slides TUPAF10 [4.227 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-TUPAF10  
About • paper received ※ 17 October 2018       paper accepted ※ 28 January 2019       issue date ※ 26 January 2019  
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TUPAF13 Calculation of the AGS Optics Based on 3D Fields Derived From Experimentally Measured Fields on Median Plane 209
 
  • N. Tsoupas, J.S. Berg, S.J. Brooks, F. Méot, V. Ptitsyn, D. Trbojevic
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by the US Department of Energy
Closed orbit cal­cu­la­tions of the AGS syn­chro­tron were per­formed and the beam pa­ra­me­ters at the ex­trac­tion point of the AGS [1] were cal­cu­lated using the RAY­TRACE com­puter code [2] which was mod­i­fied to gen­er­ate 3D fields from the ex­per­i­men­tally mea­sured field maps on the me­dian plane of the AGS com­bined func­tion mag­nets. The al­go­rithm which gen­er­ates 3D fields from field maps on a plane is de­scribed in ref­er­ence [3] which dis­cusses the de­tails of the math­e­mat­i­cal foun­da­tion of this ap­proach. In this pre­sen­ta­tion we will dis­cuss re­sults from stud­ies [1,4] that are based on the 3D fields gen­er­ated from the known field com­po­nents on a rec­tan­gu­lar grid of a plane. A brief overview of the al­go­rithm used will be given, and two meth­ods of cal­cu­lat­ing the re­quired field de­riv­a­tives on the plane will be pre­sented. The cal­cu­lated 3D fields of a mod­i­fied Hal­bach mag­net [5] of inner ra­dius of 4.4 cm will be cal­cu­lated using the two dif­fer­ent meth­ods of cal­cu­lat­ing the field de­riv­a­tives on the plane and the cal­cu­lated fields will be com­pared against the ’ideal’ fields as cal­cu­lated by the OPERA com­puter code [6]. [1] N. Tsoupas et. al. ’Closed orbit cal­cu­la­tions at AGS and Ex­trac­tion Beam Pa­ra­me­ters at H13 AD/RHIC/RD-75 Oct. 1994 [2] S.B. Kowal­ski and H.A. Enge ’The Ion-Op­ti­cal Pro­gram Ray­trace’ NIM A258 (1987) 407 [3] K. Makino, M. Berz, C. John­stone, Int. Jour­nal of Mod­ern Physics A 26 (2011) 1807-1821 [4] N. Tsoupas et. al. ’Ef­fects of Di­pole Mag­net In­ho­mo­gene­ity on the Beam El­lip­soid’ NIM A258 (1987) 421-425 [5] ’The CBETA pro­ject: arXiv.​org > physics > arXiv:1706.04245’’ [6] Vec­tor Fields Inc. https://​operafea.​com/​ 		 
slides icon Slides TUPAF13 [1.772 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICAP2018-TUPAF13  
About • paper received ※ 20 October 2018       paper accepted ※ 07 December 2018       issue date ※ 26 January 2019  
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