simulating the mice target
DESCRIPTION
Simulating the MICE target. M. Apollonio, A. Dobbs - 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”: - PowerPoint PPT PresentationTRANSCRIPT
Simulating the MICE target
M. Apollonio, A. Dobbs - IC
27/11/2008 1MICE 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.
27/11/2008 2MICE Target Workshop - IC
G4Beamline Studies
27/11/2008 3MICE Target Workshop - IC
10 mm
10 mm
XZ
25 deg
Q1-TGTaxis
25 deg
lostto Q1
secondariesproduction20<theta<30propagation toplane Aacos(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
25 deg
FAT SHORT
TILTED TGT10o / 25o
27/11/2008 5MICE Target Workshop - IC
25 deg
Cylinder: OD=6mm/ID=4.7 mm
Materials:Ti Be Al
27/11/2008 6MICE Target Workshop - IC
Tgt_long_slim_rot0: y:x Nprimaries=100M
27/11/2008 7MICE Target Workshop - IC
A
Tgt_long_slim: y:x rotation 25 deg + shift 4.226
27/11/2008 8MICE Target Workshop - IC
B
27/11/2008 9MICE Target Workshop - IC
at Q1 plane in Q1 bore
C
Tgt_tilt25_rot0: y:x Nprimaries=10M
27/11/2008 10MICE Target Workshop - IC
A
At Q1 plane Q1 bore
27/11/2008 11MICE Target Workshop - IC
C
Tgt_short_fat_rot0: y:x
27/11/2008 12MICE Target Workshop - IC
Tgt_cyl_rot0: y:x
27/11/2008 13MICE Target Workshop - IC
27/11/2008 14MICE Target Workshop - IC
27/11/2008 15MICE Target Workshop - IC
27/11/2008 16MICE Target Workshop - IC
ORBIT Results Summary
Adam Dobbs 1st Nov 200827/11/2008 17MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 18
AbstractAn 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.
27/11/2008 18MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 19
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
27/11/2008 19MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 20
ModelThe 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.
27/11/2008 20MICE Target Workshop - IC
ORBIT phys.models Elastic/inelastic/nuclear
27/11/2008 MICE Target Workshop - IC 21
TGT
25/11/08 ORBIT Results, Adam Dobbs 22
ResultsThe 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.
27/11/2008 22MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 23
Injection losses MICE target losses MICE target losses
Short-Fat: 27mm above axis, -1 to 10ms
27/11/2008 23MICE Target Workshop - IC
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Short-Fat: 27mm above axis, 8 to 10ms
27/11/2008 24MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 25
Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 1986 14 0.00704935
Mice2 11110 115.226 0 0 0
Mice3 11120 115.227 0 0 0
Mice4 11130 115.228 0 0 0
Mice5 11140 115.229 0 0 0
Mice6 11150 115.23 0 0 0
Mice7 11160 115.231 0 0 0
Mice8 11170 115.232 0 0 0
Mice9 11180 115.233 0 0 0
Mice10 11190 115.234 0 0 0
27/11/2008 25MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 26
Long-Thin: 27mm above axis, -1 to 10ms(NB: present config)
27/11/2008 26MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 27
Long-Thin: 27mm above axis, 8 to 10ms
27/11/2008 27MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 28
Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 613 3 0.00489396
Mice2 11110 115.226 615 0 0
Mice3 11120 115.227 617 0 0
Mice4 11130 115.228 617 0 0
Mice5 11140 115.229 614 1 0.00162866
Mice6 11150 115.23 609 0 0
Mice7 11160 115.231 601 0 0
Mice8 11170 115.232 592 1 0.00168919
Mice9 11180 115.233 581 0 0
Mice10 11190 115.234 568 0 0
27/11/2008 28MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 29
Long-Thin: 26mm above axis, -1 to 10ms
27/11/2008 29MICE Target Workshop - IC
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Long-Thin: 26mm above axis, 8 to 10ms
27/11/2008 30MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 31
Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 1045 6 0.00574163
Mice2 11110 115.226 1043 2 0.00191755
Mice3 11120 115.227 1051 0 0
Mice4 11130 115.228 1042 0 0
Mice5 11140 115.229 1038 0 0
Mice6 11150 115.23 1020 0 0
Mice7 11160 115.231 1003 0 0
Mice8 11170 115.232 995 0 0
Mice9 11180 115.233 990 0 0
Mice10 11190 115.234 966 1 0.0010352
27/11/2008 31MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 32
Long-Thin: 27mm above axis, 250 rotation, -1 to 10ms
27/11/2008 32MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 33
Long-Thin: 27mm above axis, 250 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.
27/11/2008 33MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 34
Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 205 0 0
Mice2 11110 115.226 202 0 0
Mice3 11120 115.227 181 1 0.00552486
Mice4 11130 115.228 191 0 0
Mice5 11140 115.229 197 1 0.00507614
Mice6 11150 115.23 215 2 0.00930233
Mice7 11160 115.231 227 1 0.00440529
Mice8 11170 115.232 214 0 0
Mice9 11180 115.233 203 0 0
Mice10 11190 115.234 0 0 0
27/11/2008 34MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 35
Reduced: 27mm above axis, -1 to 10ms
27/11/2008 35MICE Target Workshop - IC
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Reduced (1mm^2): 27mm above axis, 8 to 10ms
27/11/2008 36MICE Target Workshop - IC
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Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 1044 6 0.00574713
Mice2 11110 115.226 0 0 0
Mice3 11120 115.227 0 0 0
Mice4 11130 115.228 0 0 0
Mice5 11140 115.229 0 0 0
Mice6 11150 115.23 0 0 0
Mice7 11160 115.231 0 0 0
Mice8 11170 115.232 0 0 0
Mice9 11180 115.233 0 0 0
Mice10 11190 115.234 0 0 0
27/11/2008 37MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 38
Reduced: 26mm above axis, 8 to 10ms
27/11/2008 38MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 39
Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 1620 9 0.00555556
Mice2 11110 115.226 0 0 0
Mice3 11120 115.227 0 0 0
Mice4 11130 115.228 0 0 0
Mice5 11140 115.229 0 0 0
Mice6 11150 115.23 0 0 0
Mice7 11160 115.231 0 0 0
Mice8 11170 115.232 0 0 0
Mice9 11180 115.233 0 0 0
Mice10 11190 115.234 0 0 0
27/11/2008 39MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 40
Reduced: 25mm above axis, 8 to 10ms
27/11/2008 40MICE Target Workshop - IC
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Name Index Position [m] # Hits # Absorbed Efficiency
Mice1 11100 115.225 3286 22 0.00669507
Mice2 11110 115.226 0 0 0
Mice3 11120 115.227 0 0 0
Mice4 11130 115.228 0 0 0
Mice5 11140 115.229 0 0 0
Mice6 11150 115.23 0 0 0
Mice7 11160 115.231 0 0 0
Mice8 11170 115.232 0 0 0
Mice9 11180 115.233 0 0 0
Mice10 11190 115.234 0 0 0
27/11/2008 41MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 42
Reduced: 24mm above axis, 8 to 10ms
27/11/2008 42MICE Target Workshop - IC
25/11/08 ORBIT Results, Adam Dobbs 43
Name Index Position [m] # Hits #Absorbed Efficiency
Mice1 11100 115.225 6039 38 0.00629243
Mice2 11110 115.226 0 0 0
Mice3 11120 115.227 0 0 0
Mice4 11130 115.228 0 0 0
Mice5 11140 115.229 0 0 0
Mice6 11150 115.23 0 0 0
Mice7 11160 115.231 0 0 0
Mice8 11170 115.232 0 0 0
Mice9 11180 115.233 0 0 0
Mice10 11190 115.234 0 0 0
27/11/2008 43MICE Target Workshop - IC
Circular-solid 6mm radius: 27mm above axis, 8 to 10ms
27/11/2008 44MICE Target Workshop - IC
Name Index Position [m] # Hits #
Absorbed
Efficienc
y
Mice1 11100 115.23 671 5 0.01
Mice2 11110 115.23 820 0 0
Mice3 11120 115.23 953 1 0
Mice4 11130 115.23 1019 0 0
Mice5 11140 115.23 1058 2 0
Mice6 11150 115.23 1062 0 0
Mice7 11160 115.23 1036 0 0
Mice8 11170 115.23 982 0 0
Mice9 11180 115.23 863 0 0
Mice10 11190 115.23 706 0 0
27/11/2008 45MICE Target Workshop - IC
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SUMMARY of the SUMMARIES
ORBIT Results Summary
Target Run Depth above axis (mm) LP end of spill MICE Collimator Hits MICE Collimator Absorber % Efficiency
Short Fat 6.1 27 454 1986 14 0.70493454
Long Thin 6.2 27 636 6027 5 0.08296001
Reduced 6.5 27 211 1044 6 0.57471264
Rotated 25deg 7.1 27 483 1835 5 0.27247956
Circular 6mm rad 8.1 27 1047 9170 8 0.087241
Long Thin 6.4 26 1083 10193 9 0.08829589
Reduced 6.6 26 352 1620 9 0.55555556
Reduced 6.7 25 700 3286 22 0.669507
Reduced 6.8 24 1347 6039 38 0.62924325