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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.

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Update on step iii

update on STEP III

M. Apollonio

University of Oxford

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the case for STAGE III

first demonstration of cooling with solid absorber(s) ?

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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)

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800 mm

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(b)

(a)

800 mm

(a)

(b)

emi=10 mm rad

T=98.4 %

T=97.9 %

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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!

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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)

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eT (cm rad)


: 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

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Z (m)



emi vs Z

Pz vs Z

Beta= 70cm

-3%

-7.3%

Beta= 50 cm

-3%

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vacuum (no absorbers)

LiH absorber

LiH absorber - vacuum

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emi. % variation

vacuum growth subtracted

equilibrium

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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

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