• A. Afanasev, R.J. Abrams, C.M. Ankenbrandt, K.B. Beard, R.P. Johnson, T.J. Roberts, C. Y. Yoshikawa
  Muons, Inc, Batavia
• M. Popovic
  Fermilab, Batavia

We study elec­tron-positron in-flight an­ni­hi­la­tion as a po­ten­tial source of quasi-mo­noen­er­get­ic pho­ton (or gam­ma-ray) beams. A high-in­ten­si­ty tun­able-en­er­gy (1.5 MeV to 15 MeV) gamma source has many po­ten­tial uses in med­i­cal, in­dus­tri­al and se­cu­ri­ty ap­pli­ca­tions. Sev­er­al elec­tron-positron col­li­sion ge­ome­tries are con­sid­ered: a) head-on; b) collinear; and c) positron beam in­ci­dent on a fixed elec­tron tar­get. We an­a­lyze ad­van­tages of each of the ge­ome­tries in order to op­ti­mize pa­ram­e­ters of the gen­er­at­ed gam­ma-ray beams.

• C. Y. Yoshikawa, R.J. Abrams, A. Afanasev, C.M. Ankenbrandt, K.B. Beard
  Muons, Inc, Batavia
• D.V. Neuffer
  Fermilab, Batavia

A com­pact tun­able gamma ray source has many po­ten­tial uses in med­i­cal and in­dus­tri­al ap­pli­ca­tions. One novel scheme to pro­duce an in­tense beam of gam­mas re­lies on the abil­i­ty to cre­ate a high flux of positrons. We pre­sent var­i­ous positron pro­duc­tion meth­ods that are com­pat­i­ble with this ap­proach for pro­duc­ing the in­tense beam of gam­mas.

• T.J. Roberts, K.B. Beard
  Muons, Inc, Batavia
• S. Ahmed, D. Huang, D.M. Kaplan, L.K. Spentzouris
  Illinois Institute of Technology, Chicago, Illinois

The G4beam­line pro­gram* is a use­ful and steadi­ly im­prov­ing tool to quick­ly and eas­i­ly model beam lines and ex­per­i­men­tal equip­ment with­out user pro­gram­ming. It has both graph­i­cal and com­mand-line user in­ter­faces. Un­like most ac­cel­er­a­tor physics codes, it eas­i­ly han­dles a wide range of ma­te­ri­als and fields, being par­tic­u­lar­ly well suit­ed for the study of muon and neu­tri­no fa­cil­i­ties. As it is based on the Gean­t4 toolk­it**, G4beam­line in­cludes most of what is known about the in­ter­ac­tions of par­ti­cles with mat­ter. We are con­tin­u­ing the de­vel­op­ment of G4beam­line to fa­cil­i­tate its use by a larg­er set of beam line and ac­cel­er­a­tor de­vel­op­ers. A major new fea­ture is the cal­cu­la­tion of space-charge ef­fects. G4beam­line is open source and freely avail­able at: http://​g4beamline.​muonsinc.​com

* http://g4beamline.muonsinc.com
** http://geant4.cern.ch

• S.A. Bogacz
  JLAB, Newport News, Virginia
• K.B. Beard, R.P. Johnson
  Muons, Inc, Batavia

Neu­tri­no Fac­to­ries and Muon Col­lid­ers re­quire rapid ac­cel­er­a­tion of short-lived muons to mul­ti-GeV and TeV en­er­gies. A Re­cir­cu­lat­ing Lin­ear Ac­cel­er­a­tor (RLA) that uses su­per­con­duct­ing RF struc­tures can pro­vide ex­cep­tion­al­ly fast and eco­nom­i­cal ac­cel­er­a­tion to the ex­tent that the fo­cus­ing range of the RLA quadrupoles al­lows each muon to pass sev­er­al times through each high-gra­di­ent cav­i­ty. A new con­cept of rapid­ly chang­ing the strength of the RLA fo­cus­ing quadrupoles as the muons gain en­er­gy is being de­vel­oped to in­crease the num­ber of pass­es that each muon will make in the RF cav­i­ties, lead­ing to greater cost ef­fec­tive­ness. We dis­cuss the op­tics and tech­ni­cal re­quire­ments for RLA de­signs, using RF cav­i­ties ca­pa­ble of si­mul­ta­ne­ous ac­cel­er­a­tion of both μ+ and μ- species, with pulsed Linac quadrupoles and arc mag­nets to allow the max­i­mum num­ber of pass­es. The de­sign will in­clude the op­tics for the mul­ti-pass linac and droplet-shaped re­turn arcs.

Slides