Author: Schempp, A.
Paper Title Page
MOPC006 A Coupled RFQ-IH Combination for the Neutron Source FRANZ 74
 
  • M. Heilmann, O. Meusel, D. Mäder, U. Ratzinger, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  Funding: HIC for FAIR
The Frank­furt Neu­tron Source at the Stern-Ger­lach-Zen­trum is driv­en by a 2 MeV pro­ton linac con­sist­ing of a 4-rod-ra­dio-fre­quen­cy-quadrupol (RFQ) and an 8 gap IH-DTL struc­ture. RFQ and IH cav­i­ty will be pow­ered by only one radio fre­quen­cy (RF) am­pli­fi­er to re­duce costs. The RF-am­pli­fi­er of the RFQ-IH com­bi­na­tion is cou­pled into the RFQ. In­ter­nal in­duc­tive cou­pling along the axis con­nects the RFQ with the IH cav­i­ty en­sur­ing the re­quired power tran­si­tion as well as a fixed phase re­la­tion be­tween the two struc­tures. The main ac­cel­er­a­tion of 120 keV up to 2.03 MeV will be reached by the RFQ-IH com­bi­na­tion with 175 MHz and at a total length of 2.3 m. The loss­es in the RFQ-IH com­bi­na­tion are about 200 kW. 		 
 
MOPC028 Beam Acceleration of DPIS RFQ at IMP 128
 
  • Z.L. Zhang, X.H. Guo, Y. He, Y. Liu, S. Sha, A. Shi, L.P. Sun, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  • R.A. Jameson, A. Schempp
    IAP, Frankfurt am Main, Germany
  • M. Okamura
    BNL, Upton, Long Island, New York, USA
  
  Beam test of the di­rect plas­ma in­jec­tion scheme (DPIS) is car­ried out suc­cess­ful­ly for the first time in China, by set­ting up a com­pre­hen­sive test and re­search plat­form of RFQ and laser ion source. The C6+ beam is ac­cel­er­at­ed suc­cess­ful­ly, and the peak beam cur­rent reach­es more than 6mA which is mea­sured by a Fara­day cup of unique struc­ture. The RF power cou­pled into the RFQ cav­i­ty is also ex­am­ined, and re­sults re­veal that it is the RF power of about 195kW that can pro­duce the peak beam cur­rent.  
 
WEPS034 A CW RFQ Prototype 2559
 
  • U. Bartz, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  A short RFQ pro­to­type was built for RF-tests of high power RFQ struc­tures. We will study ther­mal ef­fects and de­ter­mine crit­i­cal points of the de­sign. HF-sim­u­la­tions with CST Mi­crowave Stu­dio and mea­sure­ments were done. The cw-tests with 20 kW/m RF-pow­er and sim­u­la­tions of ther­mal ef­fects with ALGOR were fin­ished suc­cess­ful­ly. The op­ti­miza­tion of some de­tails of the HF de­sign is on focus now. First re­sults and the sta­tus of the pro­ject will be pre­sent­ed.  
 
WEPS035 Beam Measurements with the New RFQ Beam Matching Section at the Frankfurt Funneling Experiment 2562
 
  • M. Baschke, A. Schempp, J.S. Schmidt
    IAP, Frankfurt am Main, Germany
  • H. Zimmermann
    Accelerator Services, Oberursel, Germany
  
  Funding: BMBF
Fun­nel­ing is a method to in­crease low en­er­gy beam cur­rents in mul­ti­ple stages. The Frank­furt Fun­nel­ing Ex­per­i­ment is a model of such a stage. The ex­per­i­ment is built up of two ion sources with elec­tro­stat­ic lens sys­tems, a Two-Beam-RFQ ac­cel­er­a­tor, a fun­nel­ing de­flec­tor and a beam di­ag­nos­tic sys­tem. The two beams are bunched and ac­cel­er­at­ed in a Two-Beam RFQ. A fun­nel­ing de­flec­tor com­bines the bunch­es to a com­mon beam axis. A new beam trans­port sys­tem be­tween RFQ ac­cel­er­a­tor and de­flec­tor has been con­struct­ed and mount­ed. With these ex­tend­ed RFQ-elec­trodes the drift be­tween the Two-Beam-RFQ and the rf-de­flec­tor will be min­i­mized and there­fore un­want­ed emit­tance growth re­duced. After first rf mea­sure­ments cur­rent work are beam tests with the im­proved Two-Beam-RFQ. First re­sults will be pre­sent­ed. 		 
 
WEPS037 RF Design of a 325 MHz 4-ROD RFQ 2568
 
  • B. Koubek, A. Schempp, J.S. Schmidt
    IAP, Frankfurt am Main, Germany
  • L. Groening
    GSI, Darmstadt, Germany
  
  Usu­al­ly 4-ROD Radio Fre­quen­cy Quadrupoles (RFQ) are built for fre­quen­cies up to 216 MHz. For high­er fre­quen­cies 4-VANE struc­tures are more com­mon. The ad­van­tages of 4-Rod struc­tures, the greater flex­i­bil­i­ty for tun­ing and being more com­fort­able for main­te­nance, are mo­ti­vat­ing the de­vel­op­ment of a 4-Rod RFQ for high­er fre­quen­cies than 216 MHz. In par­tic­u­lar a 325 MHz RFQ with an out­put en­er­gy of 3 MeV is need­ed for the pro­ton linac for the FAIR pro­ject of GSI. This paper re­ports about the de­sign stud­ies and the lat­est de­vel­op­ments of this RFQ.  
 
WEPS039 General Layout of the 17 MeV Injector for MYRRHA 2574
 
  • H. Podlech, M. Busch, F.D. Dziuba, H. Klein, D. Mäder, U. Ratzinger, A. Schempp, R. Tiede, C. Zhang
    IAP, Frankfurt am Main, Germany
  • M. Amberg
    HIM, Mainz, Germany
  
  Funding: European Union FP7 MAX Contract Number 269565
The MYRRHA Pro­ject (Multi Pur­pose Hy­brid Re­ac­tor for High Tech Ap­pli­ca­tions) at Mol/bel­gium will be a user fa­cil­i­ty with em­pha­sis on re­search with neu­tron gen­er­at­ed by a spal­la­tion source. One main as­pect is the demon­stra­tion of nu­cle­ar waste tech­nol­o­gy using an ac­cel­er­a­tor driv­en sys­tem. A su­per­con­duct­ing linac de­liv­ers a 4 mA, 600 MeV pro­ton beam. The first ac­cel­er­at­ing sec­tion is cov­ered by the 17 MeV in­jec­tor. It con­sists of a pro­ton source, an RFQ, two room tem­per­a­ture CH cav­i­ties and 4 su­per­con­duct­ing CH-cav­i­ties. The ini­tial de­sign has used an RF fre­quen­cy of 352 MHz. Re­cent­ly the fre­quen­cy of the in­jec­tor has been set to 176 MHz. The main rea­son is the pos­si­ble use of a 4-rod-RFQ with re­duced power dis­si­pa­tion and en­er­gy, re­spec­tive­ly. The sta­tus of the over­all in­jec­tor lay­out in­clud­ing cav­i­ty de­sign is pre­sent­ed. 		 
poster icon Poster WEPS039 [2.281 MB]  
 
WEPS041 Tuning of the New 4-Rod RFQ for FNAL 2580
 
  • J.S. Schmidt, B. Koubek, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  For the in­jec­tor up­grade at FNAL a 4-rod Radio Fre­quen­cy Quadrupole (RFQ) with a res­o­nance fre­quen­cy of 200 MHz has been build. With this short struc­ture of only 1.3 m a very com­pact in­jec­tor de­sign has been re­al­ized. Sim­u­la­tions with CST Mi­crowave Stu­dio® were per­formed for the de­sign. Their re­sults lead­ing to the RF char­ac­ter­i­za­tions of the RFQ and the final RF setup which has been ac­com­plished at IAP of the Goethe-Uni­ver­si­ty Frank­furt are pre­sent­ed in this paper.  
 
WEPS043 From EUROTRANS to MAX: New Strategies and Approaches for the Injector Development 2583
 
  • C. Zhang, H. Klein, D. Mäder, H. Podlech, U. Ratzinger, A. Schempp, R. Tiede
    IAP, Frankfurt am Main, Germany
  
  Funding: The research leading to these results has received funding from the European Atomic Energy Community’s (Euratom) Seventh Framework Programme FP7/2007-2011 under grant agreement n° [269565].
As the suc­ces­sor of the EU­RO­TRANS pro­ject, the MAX pro­ject is aim­ing to con­tin­ue the R&D ef­fects for a Eu­ro­pean Ac­cel­er­a­tor-Driv­en Sys­tem and to bring the con­cep­tu­al de­sign to re­al­i­ty. The lay­out of the driv­er linac for MAX will fol­low the ref­er­ence de­sign made for the XT-ADS phase of the EU­RO­TRANS pro­ject. For the in­jec­tor part, new de­sign strate­gies and ap­proach­es, e.g. half res­o­nant fre­quen­cy, half tran­si­tion-en­er­gy be­tween the RFQ and the CH-DTL, and using the 4-rod RFQ struc­ture in­stead of the orig­i­nal­ly pro­posed 4-vane RFQ, have been con­ceived and stud­ied to reach a more re­li­able CW op­er­a­tion at re­duced costs. In this paper, the de­sign and sim­u­la­tion re­sults of the MAX in­jec­tor are pre­sent­ed. 		 
 
WEPS068 Progress towards an RFQ-based Front End for LANSCE 2658
 
  • R.W. Garnett, S.S. Kurennoy, J.F. O'Hara, L. Rybarcyk
    LANL, Los Alamos, New Mexico, USA
  • A. Schempp
    IAP, Frankfurt am Main, Germany
  
  Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
The LAN­SCE lin­ear ac­cel­er­a­tor at Los Alam­os Na­tion­al Lab­o­ra­to­ry pro­vides H− and H+ beams to sev­er­al user fa­cil­i­ties that sup­port Iso­tope Pro­duc­tion, NNSA Stock­pile Stew­ard­ship, and Basic En­er­gy Sci­ence pro­grams. These beams are ini­tial­ly ac­cel­er­at­ed to 750 keV using Cock­croft-Wal­ton (CW) based in­jec­tors that have been in op­er­a­tion for over 37 years. They have fail­ure modes which can re­sult in pro­longed op­er­a­tional down­time due to the un­avail­abil­i­ty of re­place­ment parts. To re­duce long-term op­er­a­tional risks and to re­al­ize fu­ture beam per­for­mance goals in sup­port of the Ma­te­ri­als Test Sta­tion (MTS) and the Mat­ter-Ra­di­a­tion In­ter­ac­tions in Ex­tremes (MaRIE) Fa­cil­i­ty, plans are un­der­way to de­vel­op a Ra­dio-Fre­quen­cy Quadrupole (RFQ) based front end as a mod­ern in­jec­tor re­place­ment for the ex­ist­ing CW in­jec­tors. Our progress to date will be dis­cussed. 		 
 
WEPS040 The Driver Linac of the Neutron Source FRANZ 2577
 
  • U. Ratzinger, B. Basten, L.P. Chau, H. Dinter, M. Droba, M. Heilmann, M. Lotz, O. Meusel, I. Müller, D. Mäder, Y.C. Nie, D. Noll, H. Podlech, A. Schempp, W. Schweizer, K. Volk, C. Wiesner, C. Zhang
    IAP, Frankfurt am Main, Germany
  
  FRANZ is under con­struc­tion at the Goethe Uni­ver­si­ty Frank­furt. A 2MeV ± 100 keV pro­ton beam will pro­duce 1 keV to 200 keV neu­trons on a Li7 tar­get. Ex­per­i­ments are planned in the field of nu­cle­ar as­tro­physics as well as in ap­plied physics. A dc op­er­at­ed pro­ton source with a max­i­mum beam cur­rent of 200 mA was suc­cess­ful­ly beam test­ed end of 2010. FRANZ will have two ex­per­i­men­tal areas: One for ac­ti­va­tion ex­per­i­ments with cw pro­ton beams of a few mA gen­er­at­ing a us­able neu­tron flux of some 10 bil­lion per square cm per sec­ond, the other one for 250 kHz, 1 ns short neu­tron bunch­es gen­er­at­ed by 1 ns pro­ton puls­es of a few Am­pere beam cur­rent. A spe­cial 2 MeV, 175 MHz high cur­rent cav­i­ty is re­al­ized at pre­sent as a RFQ-DTL com­bi­na­tion. Novel tech­niques have been in­vent­ed to reach the need­ed pulsed tar­get beam cur­rent by a bunch com­pres­sor sys­tem.
Work supported by HICforFAIR and GSI.