M.apollonioam0412071 M. Apollonio University of Oxford update on STEP III.

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Presentation transcript:

m.apollonioam M. Apollonio University of Oxford update on STEP III

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

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

m.apollonioam mm

m.apollonioam mm T=97.9 % T=98.4 % emi=10 mm rad (a)(b) (a) (b)

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

m.apollonioam emittance growth in vacuum Z (m)  T (final)/  T (initial)  i =1.0 cm rad  T /  T =2.8% 2.8 %  T /  T Z (m)  T (cm rad)

m.apollonioam : emittance evolution in a cylindrical symmetric channel non uniform B z can cause  growth (e.g. flip region) Z (m)  T (m rad) ecalc9 MUC-NOTE 0071 prediction Most of the effect explained

m.apollonioam (a) 13 cm LiH absorber in the middle

m.apollonioam % -3% Pz vs Z emi vs Z Beta= 70cm Beta= 50 cm

m.apollonioam (b) 13 cm LiH absorber in the II solenoid

m.apollonioam vacuum (no absorbers) LiH absorber LiH absorber - vacuum

m.apollonioam equilibrium vacuum growth subtracted emi. % variation

m.apollonioam

m.apollonioam Conclusion 1)Slow B flip  emi growth. Has to be minimized 2)a single absorber seems to work better 3) the middle point cannot have a low beta  cooling effect reduced 4) reduce beta_centre  increase M1 currents  forces 5) better to place abs inside the II solenoid  uneasy 6) transmission: large radius spool piece doesn’t seem to create dramatic effects