Author: Rathsman, K.
Paper Title Page
MOPC136 The RF Power Source for the High Beta Elliptical Cavities of the ESS Linac 397
 
  • K. Rathsman, H. Danared, R. Zeng
    ESS, Lund, Sweden
  • A.J. Johansson
    Lund University, Lund, Sweden
  • C. Lingwood
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • R.J.M.Y. Ruber
    Uppsala University, Uppsala, Sweden
  • C. de Almeida Martins
    IST-UTL, Lisbon, Portugal
  
  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 120 high beta el­lip­ti­cal cav­i­ties, which op­er­ate at a fre­quen­cy of 704 MHz and ac­cel­er­ate pro­tons from 600 MeV to 2.5 GeV, ac­count for more than half of the total num­ber of rf cav­i­ties in the ESS linac and three quar­ter of the total beam power need­ed. Be­cause of the large num­ber of rf power sources and the high power level need­ed, all the de­sign and de­vel­op­ment ef­forts for the rf power source have so far been fo­cused on this part of the ac­cel­er­a­tor. The de­sign and de­vel­op­ment sta­tus of the rf power source is re­port­ed in this paper with em­pha­sis on re­li­a­bil­i­ty, main­tain­abil­i­ty, safe­ty, power ef­fi­cien­cy, in­vest­ment cost and pro­duc­tion ca­pac­i­ty.  
 
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.  
 
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.