Simulating the MICE target M. Apollonio, A. Dobbs - IC 27/11/20081MICE Target Workshop - IC.

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Presentation transcript:

Simulating the MICE target M. Apollonio, A. Dobbs - IC 27/11/20081MICE Target Workshop - IC

Motivations: Optimise secondary production minimising dangerous losses in ISIS Assess better orientation/shape of the shaft for secondary production A work at “four hands”: –A. Dobbs, ORBIT simulation of ISIS ring/interaction with target/comparison with taken data from MICE shifts, –MA, G4Beamline simulation of secondary production with a set of shafts. 27/11/20082MICE Target Workshop - IC

G4Beamline Studies 27/11/20083MICE Target Workshop - IC

10 mm X Z 25 deg Q1-TGT axis 25 deg lost to Q1 secondaries production 20<theta<30 propagation to plane A acos(Pz/Ptot)>20 && acos(Pz/Ptot)<30 rotation & propagation to plane B A A B C shift & align with Q1-TGT axis LONG SLIM 4

25 deg FAT SHORT TILTED TGT 10o / 25o 27/11/20085MICE Target Workshop - IC

25 deg Cylinder: OD=6mm/ID=4.7 mm Materials: Ti Be Al 27/11/20086MICE Target Workshop - IC

Tgt_long_slim_rot0: y:x Nprimaries=100M 27/11/20087MICE Target Workshop - IC A

Tgt_long_slim: y:x rotation 25 deg + shift /11/20088MICE Target Workshop - IC B

27/11/20089MICE Target Workshop - IC at Q1 plane in Q1 bore C

Tgt_tilt25_rot0: y:x Nprimaries=10M 27/11/200810MICE Target Workshop - IC A

At Q1 plane Q1 bore 27/11/200811MICE Target Workshop - IC C

Tgt_short_fat_rot0: y:x 27/11/200812MICE Target Workshop - IC

Tgt_cyl_rot0: y:x 27/11/200813MICE Target Workshop - IC

27/11/200814MICE Target Workshop - IC

27/11/200815MICE Target Workshop - IC

config N-POT Dx(mm) H(mm) Barea(mm2) V(mm3) Q1 resc to 1e8 A-imp(mm2) sc-f resc to A-imp pn pi+ pi- mu+ mu- gam e+/e- A rho A/rho pi+ exptd cyl_Ti5.0E cyl_Ti2.5E cyl_Be1.0E cyl_Al1.0E long slim1.0E A/rho primaries ref-impact area 1.E /11/200816MICE Target Workshop - IC

ORBIT Results Summary Adam Dobbs1 st Nov /11/200817MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs18 Abstract An overview is presented of the results obtained from simulating beam loss in the ISIS synchrotron, using the ORBIT programme. Particluar reference is made to loss caused by the MICE target. Results for three target orientations are presented (“Long-Thin”, “Short-Fat” and parallel to the MICE beamline). Two target sizes are used, 10mm by 1mm and 1mm by 1mm. Dip depths ranging from 27mm to 24mm above beam axis are shown. 27/11/200818MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs19 Target setups: Target Orientations “Short-Fat” – 1mm along z – axis, 10mm along x - axis “Long-Thin” – 10mm along z – axis, 1mm along x – axis (true orientation) “Reduced” – 1mm along z – axis, 1mm along x - axis 27/11/200819MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs20 Model The MICE target is modelled as a block of iron inserted into the ISIS beam 2ms before extraction, sitting at a position of ~115m around the synchrotron ring. The target is also currently modelled as being static. Work is being done about the possibility of improving the model to make the target titanium and dynamic. 27/11/200820MICE Target Workshop - IC ORBIT phys.models Elastic/inelastic/nuclear

27/11/2008MICE Target Workshop - IC21 TGT

25/11/08ORBIT Results, Adam Dobbs22 Results The simulation results are represented as a series of 2D histograms. They show the number of particles lost from the beam as a function of the time in an ISIS spill and the position in the synchrotron in which they were lost. Further a table is also presented for each target configuration, showing the number of “hits” (intersections of the volume) in the MICE target, for the last 2ms of the ISIS spill. The tables also give the number of particles “absorbed” by the target i.e. turned into lost particles by their interaction with the target. 27/11/200822MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs23 Injection losses MICE target losses Short-Fat: 27mm above axis, -1 to 10ms 27/11/200823MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs24 Short-Fat: 27mm above axis, 8 to 10ms 27/11/200824MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs25 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200825MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs26 Long-Thin: 27mm above axis, -1 to 10ms (NB: present config) 27/11/200826MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs27 Long-Thin: 27mm above axis, 8 to 10ms 27/11/200827MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs28 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200828MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs29 Long-Thin: 26mm above axis, -1 to 10ms 27/11/200829MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs30 Long-Thin: 26mm above axis, 8 to 10ms 27/11/200830MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs31 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200831MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs32 Long-Thin: 27mm above axis, 25 0 rotation, -1 to 10ms 27/11/200832MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs33 Long-Thin: 27mm above axis, 25 0 rotation, 8 to 10ms NB At present there remains an ambiguity in the direction of the rotation, clockwise or anti-clockwise. If / when this is resolved it will be published in an updated version of this document. 27/11/200833MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs34 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200834MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs35 Reduced: 27mm above axis, -1 to 10ms 27/11/200835MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs36 Reduced (1mm^2): 27mm above axis, 8 to 10ms 27/11/200836MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs37 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200837MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs38 Reduced: 26mm above axis, 8 to 10ms 27/11/200838MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs39 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200839MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs40 Reduced: 25mm above axis, 8 to 10ms 27/11/200840MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs41 NameIndexPosition [m]# Hits# AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200841MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs42 Reduced: 24mm above axis, 8 to 10ms 27/11/200842MICE Target Workshop - IC

25/11/08ORBIT Results, Adam Dobbs43 NameIndexPosition [m]# Hits#AbsorbedEfficiency Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200843MICE Target Workshop - IC

Circular-solid 6mm radius: 27mm above axis, 8 to 10ms 27/11/200844MICE Target Workshop - IC

NameIndex Position [m] # Hits # Absorbed Efficienc y Mice Mice Mice Mice Mice Mice Mice Mice Mice Mice /11/200845MICE Target Workshop - IC

27/11/2008MICE Target Workshop - IC46 SUMMARY of the SUMMARIES ORBIT Results Summary TargetRunDepth above axis (mm)LP end of spillMICE Collimator HitsMICE Collimator Absorber% Efficiency Short Fat Long Thin Reduced Rotated 25deg Circular 6mm rad Long Thin Reduced Reduced Reduced