1. MICE analysis meeting - (26/3/2006) 1 Update on MICE – step III M. Apollonio – University of Oxford

2. MICE analysis meeting - (26/3/2006) 2 Investigate emittance growth Optmize thickness for absorbers tested emittance growth for LiH (2 absorbers) with thinner absorbers

3. MICE analysis meeting - (26/3/2006) 3  parameters used in simulation  Pz=207 MeV/c with a spread of 10%  initial emittances ranging from 0.1 to 1.0 (cm rad)  10000 generated muons per point (i.e. initial emittance)  lost muons: worse cases at high initial  (=1.0 cm rad)  4% (LiH, C, non flip mode)  3% (C, flip mode)

4. MICE analysis meeting - (26/3/2006) 4 Flip mode: 2 absorbers LiH, Li, Be, CH, C 2x7cm absorbers = 13% pz reduction 0.22, 0.26, 0.39, 0.4, 0.57 (cm rad)

5. MICE analysis meeting - (26/3/2006) 5 net d  /  after the absorbers current optimization schemes: evbeta+MINUIT ICOOL+MINUIT with 2 absorbers equilibrium asymptotic cooling

6. MICE analysis meeting - (26/3/2006) 6 Flip mode: 2 absorbers of LiH Variable thickness (2x3cm, 2x4cm, … ) 2x4 cm 2x3 cm

7. MICE analysis meeting - (26/3/2006) 7 Flip mode: 2 absorbers of LiH Variable thickness (… 2x5cm, 2x6cm ) 2x3 cm 2x5 cm

8. MICE analysis meeting - (26/3/2006) 8 Flip mode: 2 absorbers of LiH Variable thickness (2x3cm, 2x4cm, 2x5cm, 2x6cm) EMI=1.0 2x3cm2x4 cm

9. MICE analysis meeting - (26/3/2006) 9 Flip mode: 2 absorbers of LiH Variable thickness (2x3cm, 2x4cm, 2x5cm, 2x6cm) EMI=0.5 2x3cm2x4 cm

10. MICE analysis meeting - (26/3/2006) 10 2x7cm =-13% 2x6cm =-11% 2x5cm =-9.2% 2x4cm=-7.2% 2x3cm=-5.4% Summary Plot

11. MICE analysis meeting - (26/3/2006) 11 Summary tried to reduce the thickness of the absorbers confirmed the behaviour already shown at dp/p=-13% great discrepancy with the simple model (see slide 5) emittance re-growth in the central region Side communication  started working on the G4MICE for stepIII thanks to Chris for his modifications of the code  The stepIII channel is available but currents are to be changed to the values I found in ICOOL optimization  Work in progress

12. MICE analysis meeting - (26/3/2006) 12 (%)  (cm rad) new set of data: more points (see next slides) Non Flip Mode +2.8 % +2.3 % Flip Mode