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Beam Properties

Beam Properties. Beam energy. (Terminal voltage, TOF, Wien filter, calibration  ) Energy spread.  Energy stability. Purity. Example contaminated with = ?

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Beam Properties

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  1. Beam Properties • Beam energy. (Terminal voltage, TOF, Wien filter, calibration ) • Energy spread.  • Energy stability. • Purity. Example contaminated with • = ? • Charge state. Important for interpreting integrated charge measurement. Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  2. Beam Properties • B is measured using Hall or NMR probes. • Fringe effects. • Magnetic constant Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  3. Beam Properties Q + ER = Er Resonant Capture (selected energies with large X-section) Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  4. Beam Properties Compare SRIM Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  5. Beam Properties Infinite thickness…??? Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  6. Beam Properties Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  7. Beam Properties Compare SRIM Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  8. Beam Properties Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  9. Beam Properties • Low Q-value  low E • HPGe detector calibrated using standard sources. E = E + Q - Eex Non-resonant Capture (all energies) Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  10. Nuclear Reaction Energetics • Conservation Laws • Charge, Baryon number, total energy, linear momentum, angular momentum, parity, (isospin??)……. b pb  gs a pa X  +ve Q-value  exoergic reaction. -ve Q-value  endoergic reaction. pY Y Stationary X ?? +ve Q-value  reaction possible if Ta 0. -ve Q-value  reaction not possible if Ta 0. (Is Ta > |Q| sufficient?). Conservation of momentum …… Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  11. Nuclear Reaction Energetics HW 23 • Conservation of momentum. • We usually do not detect Y. • Show that: • The threshold energy (for Ta): (the condition occurs for  = 0º). • +ve Q-value  reaction possible if Ta 0. • -ve Q-value  reaction possible if Ta> TTh. • Coulomb and other barriers…….!!! • Neutrons vs. charged particles. double valued !? solve for Q Q < 0 Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  12. Nuclear Reaction Energetics HW 23(continued) • The double valued situation occurs between TTh and the upper limit Ta\. • Double-valued in a forward cone. Q < 0 Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  13. Nuclear Reaction Energetics HW 23(continued) • Discuss thoroughly the 7Li(p,n) reaction. • During the discussion emphasize on the case when the incident proton beam is 30 keV above the threshold. • Use your computing skills. • Discuss the elasticand inelastic scatteringof neutronsusing these relations. Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  14. Nuclear Reaction Energetics Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  15. Nuclear Reaction Energetics Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  16. Nuclear Reaction Energetics Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

  17. Nuclear Reaction Energetics Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).

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