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update on STEP III

update on STEP III. M. Apollonio University of Oxford. the case for STAGE III. first demonstration of cooling with solid absorber(s) ?. Chosen configuration must comply with coil/physics constraints : 1- max current 2- temp. margin 3- b (min)  minimise m.s. Matching Coils currents.

brennan-jensen
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update on STEP III

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  1. update on STEP III M. Apollonio University of Oxford am041207

  2. the case for STAGE III first demonstration of cooling with solid absorber(s) ? am041207

  3. Chosen configuration must comply with coil/physics constraints:1- max current2- temp. margin3- b(min)  minimise m.s. Matching Coils currents Set up a procedure to find the right MC currents for a matched beam:a) b (trk1-2)=1/k, a=0b) fix b(min) B (T) b(m) Z (m) am041207

  4. 800 mm am041207

  5. (b) (a) 800 mm (a) (b) emi=10 mm rad T=98.4 % T=97.9 % am041207

  6. NB: beta_min = 49 cm (was 60cm at CM14) means M1 1.4x, M2 0.7x main issues • current increase: is it within tolereances? • magnet forces? • MC distance = 800 mm. Can it be changed? 300 A! am041207

  7. emittance growth in vacuum DeT/eT=2.8% eT (final)/eT (initial) ei=1.0 cm rad 0 1 2 3 4 5 6 Z (m) DeT/eT 2.8 % Z (m) am041207 eT (cm rad)

  8. : emittance evolution in a cylindrical symmetric channel non uniform Bz can cause e growth (e.g. flip region) ecalc9 eT (m rad) MUC-NOTE 0071 prediction Most of the effect explained am041207 Z (m)

  9. (a) 13 cm LiH absorber in the middle am041207

  10. emi vs Z Pz vs Z Beta= 70cm -3% -7.3% Beta= 50 cm -3% am041207

  11. (b) 13 cm LiH absorber in the II solenoid am041207

  12. vacuum (no absorbers) LiH absorber LiH absorber - vacuum am041207

  13. emi. % variation vacuum growth subtracted equilibrium am041207

  14. am041207

  15. Conclusion • Slow B flip  emi growth. Has to be minimized • a single absorber seems to work better • the middle point cannot have a low beta  cooling effect reduced • reduce beta_centre  increase M1 currents  forces • better to place abs inside the II solenoid  uneasy 6) transmission: large radius spool piece doesn’t seem to create dramatic effects am041207

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