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Target/Beam Interaction

Target/Beam Interaction. M. Apollonio, A. Dobbs - IC. 27/11/2008. MICE Target Workshop - IC. 1. Motivations:. optimise secondary production minimising dangerous losses in ISIS assess better orientation/shape of the shaft for secondary production a work at “four hands”:

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Target/Beam Interaction

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  1. Target/Beam Interaction M. Apollonio, A. Dobbs - IC 27/11/2008 MICE Target Workshop - IC 1

  2. Motivations: • optimise secondary production minimising dangerous losses in ISIS • assess better orientation/shape of the shaft for secondary production • a work at “four hands”: • A. Dobbs, ORBIT simulation of ISIS ring / interaction with target / comparison with data taken from MICE shifts, • MA, G4Beamline simulation of secondary production with a set of shafts 27/11/2008 MICE Target Workshop - IC 2

  3. ORBIT Results A. Dobbs 27/11/2008 MICE Target Workshop - IC 3

  4. Target Orientations (variable depths) • “Long-Thin” – 10mm along z – axis, 1mm along x – axis (true orientation) y s x • “Short-Fat” – 1mm along z – axis, 10mm along x - axis • “Reduced” – 1mm along z – axis, 1mm along x - axis 27/11/2008 MICE Target Workshop - IC 4 25/11/08 ORBIT Results, Adam Dobbs 4

  5. Short-Fat: 27mm above axis, -1 to 10ms Injection losses MICE target losses MICE target losses zoom last 2 ms 27/11/2008 MICE Target Workshop - IC 5 25/11/08 ORBIT Results, Adam Dobbs 5

  6. Long-Thin: 27mm above axis, -1 to 10ms (NB: present config) 27/11/2008 MICE Target Workshop - IC 6 25/11/08 ORBIT Results, Adam Dobbs 6

  7. Short-Fat: 27mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 7 25/11/08 ORBIT Results, Adam Dobbs 7

  8. Long-Thin: 27mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 8 25/11/08 ORBIT Results, Adam Dobbs 8

  9. Long-Thin: 26mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 9 25/11/08 ORBIT Results, Adam Dobbs 9

  10. Long-Thin: 27mm above axis, 250 rotation, 8 to 10ms NB At present there remains an ambiguity in the direction of the rotation, clockwise or anti-clockwise. If / when this is resolved it will be published in an updated version of this document. 27/11/2008 MICE Target Workshop - IC 10 25/11/08 ORBIT Results, Adam Dobbs 10

  11. Reduced (1mm^2): 27mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 11 25/11/08 ORBIT Results, Adam Dobbs 11

  12. Reduced: 26mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 12 25/11/08 ORBIT Results, Adam Dobbs 12

  13. Reduced: 25mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 13 25/11/08 ORBIT Results, Adam Dobbs 13

  14. Reduced: 24mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 14 25/11/08 ORBIT Results, Adam Dobbs 14

  15. Circular-solid6mm radius: 27mm above axis, 8 to 10ms 27/11/2008 MICE Target Workshop - IC 15

  16. G4Beamline Studies M. Apollonio 27/11/2008 MICE Target Workshop - IC 16

  17. is there a better shape for the target or orientation? • how many secondaries (pi) do we get at the Q1 bore (per impinging proton?) • what about materials? Q1-2-3 ISIS p trajectory 25o MICE TGT 27/11/2008 MICE Target Workshop - IC 17

  18. Q1-TGT axis Z X 25 deg 10 mm 10 mm B A A 25 deg rotation & propagation to plane B LONG SLIM secondaries production 20<theta<30 propagation to plane A acos(Pz/Ptot)>20 && acos(Pz/Ptot)<30 to Q1 lost C shift & align with Q1-TGT axis 18

  19. 25 deg 25 deg FAT SHORT TILTED TGT 10o / 25o 27/11/2008 MICE Target Workshop - IC 19

  20. Materials: Ti Be Al 25 deg Cylinder: OD=6mm/ID=4.7 mm 27/11/2008 MICE Target Workshop - IC 20

  21. Tgt_long_slim_rot0: y:x Nprimaries=100M A 27/11/2008 MICE Target Workshop - IC 21

  22. Tgt_long_slim: y:x rotation 25 deg + shift 4.226 B NB: this particles (ROOT file) are shooting towards Q1and can be used as an input beam for further simulations 27/11/2008 MICE Target Workshop - IC 22

  23. at Q1 planein Q1 bore C 27/11/2008 MICE Target Workshop - IC 23

  24. 27/11/2008 MICE Target Workshop - IC 24

  25. 27/11/2008 MICE Target Workshop - IC 25

  26. MICE Target Workshop - IC

  27. CONCLUSIONS - neither the shape nor the orientation of a target seem to alter significantly the production of secondaries to Q1 • the overall material volume intercepted by the beam is the main parameter (reasonable) • material other than Ti (lower A/rho) generate less secondaries (in particular pions) • a good balance should be found between weight / mechanical stiffness / and pion production • a hollow cylinder is a good solution, certainly does not worsen the performances of the present configuration 27/11/2008 MICE Target Workshop - IC 27

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