Author: Peggs, S.
Paper Title Page
MOODB02 RF Modeling Plans for the European Spallation Source 56
 
  • S. Molloy, M. Lindroos, S. Peggs
    ESS, Lund, Sweden
  • R. Ainsworth
    Royal Holloway, University of London, Surrey, United Kingdom
  • R.J.M.Y. Ruber
    Uppsala University, Uppsala, Sweden
  
  The Eu­ro­pean Spal­la­tion Source (ESS) will be the world's most pow­er­ful next gen­er­a­tion neu­tron source. The ESS linac is de­signed to ac­cel­er­ate high­ly charged bunch­es of pro­tons to a final en­er­gy of 2.5 GeV, with a de­sign beam power of 5 MW, for col­li­sion with a tar­get used to pro­duce the high neu­tron flux. In order to achieve this sev­er­al stages of RF ac­cel­er­a­tion are re­quired, each using a dif­fer­ent tech­nol­o­gy. The high beam cur­rent and power re­quire a high de­gree of con­trol of the ac­cel­er­at­ing RF, and the spec­i­fi­ca­tion that no more than 1 W/m of loss­es will be ex­pe­ri­enced means that the ex­ci­ta­tion and decay of the HOMs must be very well un­der­stood. Ex­pe­ri­ence at other high power ma­chines also im­plies that an un­der­stand­ing of the gen­er­a­tion and sub­se­quent tra­jec­to­ries of any field-emit­ted elec­trons should be un­der­stood. Ther­mal de­tun­ing of the HOM cou­plers due to mul­ti­pact­ing is a se­ri­ous con­cern here. This paper will out­line the RF mod­el­ing plans - in­clud­ing the con­struc­tion of math­e­mat­i­cal mod­els, sim­u­la­tions of HOMs, and mul­ti­pact­ing - dur­ing the cur­rent Ac­cel­er­a­tor De­sign Up­date phase, and will dis­cuss sev­er­al of the more im­por­tant is­sues for ESS.  
slides icon Slides MOODB02 [48.641 MB]  
 
TUPS096 ESS Parameter List Database and Web Interface Tools 1762
 
  • K. Rathsman, S. Peggs, P. Reinerfelt, G. Trahern
    ESS, Lund, Sweden
  • J. Bobnar
    Cosylab, Ljubljana, Slovenia
  
  The Eu­ro­pean Spal­la­tion Source is an in­ter­gov­ern­men­tal pro­ject build­ing a mul­ti­dis­ci­plinary re­search lab­o­ra­to­ry based upon the world's most pow­er­ful neu­tron source. The main fa­cil­i­ty will be built in Lund, Swe­den. Con­struc­tion is ex­pect­ed to start around 2013 and the first neu­trons will be pro­duced in 2019. The ESS linac de­liv­ers 5 MW of power to the tar­get at 2.5 GeV, with a nom­i­nal cur­rent of 50 mA. The Ac­cel­er­a­tor De­sign Up­date (ADU) col­lab­o­ra­tion of main­ly Eu­ro­pean in­sti­tu­tions will de­liv­er a Tech­ni­cal De­sign Re­port at the end of 2012. To en­sure con­sis­ten­cy of the in­for­ma­tion being used amongst all sub­groups through­out the pe­ri­od of ac­cel­er­a­tor de­sign and con­struc­tion, a pa­ram­e­ter list database and web in­ter­face have been pro­posed. The main ob­jec­tive is to pro­vide tools to iden­ti­fy in­con­sis­ten­cies among pa­ram­e­ters and to en­force groups as well as in­di­vid­u­als to work to­wards the same so­lu­tion. An­oth­er goal is to make the Pa­ram­e­ter Lists a live and cred­i­ble en­deav­or so that the data and sup­port­ing in­for­ma­tion shall be use­ful to a wider au­di­ence such as ex­ter­nal re­view­ers as well as being eas­i­ly ac­ces­si­ble.  
 
WEPS059 Layout of the ESS Linac 2631
 
  • H. Danared, M. Eshraqi, W. Hees, A. Jansson, M. Lindroos, S. Peggs, A. Ponton
    ESS, Lund, Sweden
  
  The Eu­ro­pean Spal­la­tion Source will use a 2.5 GeV, 50 mA pulsed pro­ton linac to pro­duce an av­er­age 5 MW of power on the spal­la­tion tar­get. It will con­sist of nor­mal-con­duct­ing part ac­cel­er­at­ing par­ti­cles to 50 MeV in an RFQ and a drift-tube linac and a su­per­con­duct­ing part with spoke res­onators and two fam­i­lies of el­lip­ti­cal cav­i­ties. A high-en­er­gy beam trans­port takes the par­ti­cles through an up­grade sec­tion and at least one bend and de­mag­ni­fies the beam on to the tar­get. The paper will pre­sent the cur­rent lay­out of the linac and dis­cuss pa­ram­e­ters that de­fine its length from source to tar­get.  
 
WEPS064 Upgrade Strategies for High Power Proton Linacs 2646
 
  • M. Lindroos, H. Danared, M. Eshraqi, D.P. McGinnis, S. Molloy, S. Peggs, K. Rathsman
    ESS, Lund, Sweden
  • R.D. Duperrier
    CEA/DSM/IRFU, France
  • J. Galambos
    ORNL, Oak Ridge, Tennessee, USA
  
  High power pro­ton linacs are used as drivers for spal­la­tion neu­tron sources, and are pro­posed as drivers for sub-crit­i­cal ac­cel­er­a­tor driv­en tho­ri­um re­ac­tors. A linac op­ti­mized for a spe­cif­ic av­er­age pulse cur­rent can be dif­fi­cult, or in­ef­fi­cient, to op­er­ate at high­er cur­rents, for ex­am­ple due to mis-match­ing be­tween the RF cou­pler and the beam load­ed cav­i­ty, and due to High­er Order Mode ef­fects. Hard­ware is in gen­er­al de­signed to meet spe­cif­ic en­gi­neer­ing val­ues, such as pulse length and rep­e­ti­tion rate, that can be cost­ly and dif­fi­cult to change, for ex­am­ple due to pre-ex­ist­ing space con­straints. We re­view the dif­fer­ent up­grade strate­gies that are avail­able to pro­ton driv­er de­sign­ers, both for linacs under de­sign, such as the Eu­ro­pean Spal­la­tion Source (ESS) in Lund, and also for ex­ist­ing linacs, such as the Spal­la­tion Neu­tron Source (SNS) in Oak Ridge. Po­ten­tial ESS up­grades to­wards a beam power high­er than 5 MW pre­serve the orig­i­nal time struc­ture, while the SNS up­grade is di­rect­ed to­wards the ad­di­tion of a sec­ond tar­get sta­tion.  
 
WEPS028 Lattice Design of a Rapid Cycling Medical Synchrotron for Carbon/Proton Therapy 2541
 
  • D. Trbojevic, J.G. Alessi, M. Blaskiewicz, C. Cullen, H. Hahn, D.I. Lowenstein, I. Marneris, W. Meng, J.-L. Mi, C. Pai, D. Raparia, A. Rusek, J. Sandberg, N. Tsoupas, J.E. Tuozzolo, A. Zaltsman, W. Zhang
    BNL, Upton, Long Island, New York, USA
  • N.M. Cook
    Stony Brook University, Stony Brook, USA
  • J.P. Lidestri
    HHMI, New York, USA
  • M. Okamura
    RBRC, Upton, Long Island, New York, USA
  • S. Peggs
    ESS, Lund, Sweden
  
  Funding: Work supported by Cooperative Research and Development Agreement (CRADA), No. BNL-C-10-03 between the Brookhaven National Laboratory and Best Medical International, Inc.
We pre­sent a de­sign of the ion Rapid Cy­cling Med­i­cal Syn­chrotron (iRCMS) for car­bon/pro­ton can­cer ther­a­py fa­cil­i­ty. The fa­cil­i­ty de­sign, pro­duced at Brookhaven Na­tion­al Ac­cel­er­a­tor (BNL) at the Col­lid­er Ac­cel­er­a­tor Di­vi­sion (CAD) for the BEST Med­i­cal In­ter­na­tion­al, Inc., will be able to treat the can­cer pa­tients with car­bon, lighter ions and pro­tons. The low en­er­gy part ac­cel­er­ates ions and pro­tons to the ki­net­ic en­er­gy of 8 MeV. It con­sists of two ion sources (one of fully stripped car­bon ions and one for pro­tons), a Ra­dio-Fre­quen­cy Quadrupole (RFQ) and linac. The 8 GeV beam is in­ject­ed into a fast cy­cling syn­chrotron (iRCMS). The lat­tice de­sign is a race­track, with zero dis­per­sion two par­al­lel straight sec­tions. There are 24 com­bined func­tion mag­nets in the two arcs with a ra­dius of ~5.6 me­ters with max­i­mum mag­net­ic field of less than 1.3 T. The ac­cel­er­a­tion is per­formed in 30 Hz up to the re­quired en­er­gy for the can­cer tumor treat­ment as­sum­ing the spot scan­ning tech­nique. The max­i­mum en­er­gy for car­bon ions is 400 MeV. Ions are ex­tract­ed in a sin­gle turn and fed to dif­fer­ent beam lines for pa­tient treat­ment. 		 
 
FRYBA01 The European Spallation Source 3789
 
  • S. Peggs
    ESS, Lund, Sweden
  
  The prin­ci­ples of the de­sign, and the tech­ni­cal and beam dy­nam­ics chal­lenges of the ESS are pre­sent­ed, as well as pos­si­ble fu­ture up­grade op­tions.  
slides icon Slides FRYBA01 [5.122 MB]