Particle Production of Carbon Target with 20Tto2T5m Configuration at 6.75 GeV

(Updated)

X. Ding, UCLA

Target StudiesMarch 27, 2014

13/27/14

Target Setting

• 20Tto2T5m Configuration (initial beam pipe radius of 13 cm) and Fieldmap (20T2T);

• Code: MARS15(2014) with ICEM 4 = 1; • Proton beam: 6.75 GeV (KE) and launched at z = -100 cm, Focal beam with waist at z= 0 m and emittance of 5 μm;• Production Collection: (5 m, 10 m, 16 m and 50 m

downstream, 40 MeV < KE < 180 MeV).• Graphite density = 1.8

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Configuration

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Energy Card Setting

• ENRG E0 EM EPSTAM EMCHR EMNEU EMIGA EMIEL E0: The incident particle kinetic energy; EM: The hadron threshold energy (Default:0.0145 GeV); EPSTAM: The star production threshold kinetic energy (Default:0.03 GeV); EMCHR: The threshold energy applied collectively to muons, heavy ions

and charged hadrons (Default: 0.001 GeV); EMNEU: The threshold energy for neutrons (Default:10-4 GeV) EMIGA: The threshold energy for γ (Default:10-4 GeV); EMIEL: The threshold energy for e± (Default: 5*10-4 GeV)

Use non-default setting: ENRG 1=6.75 2=0.02 3=0.3 4=0.01 5=0.05 6=0.01 7=0.01

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Particle Production vs. Target Length(106 events, no beam dump)

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Co-linear target and beam. TR/BR=4

With beam angle = 130 mrad, the dump rod may conflict with the target containment vessel, so compare with beam angle = 65 mard.

z = 5 mSmaller tilt angle favored

Particle Production vs. Target Length(106 events, no beam dump)

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Co-linear target and beam. TR/BR=4

With beam angle = 130 mrad, the dump rod may conflict with the target containment vessel, so compare with beam angle = 65 mard.

z = 10 mSmaller tilt angle favored

z = 16 mSmaller tilt angle favored

Particle Production vs. Target Radius(106 events, no beam dump)

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Co-linear target and beam. TR/BR=4

Particle Production vs. Target Radius(106 events, no beam dump)

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Co-linear target and beam. TR/BR=4

Particle Production vs. Beam Angle(106 events, no beam dump)

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Co-linear target and beam. TR/BR=4

Particle Production vs. Beam Angle(106 events, no beam dump)

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Co-linear target and beam. TR/BR=4

z = 16 m and z = 50 mTilt angle 40-60 mrad favored

Energy Spectra of , K, (105 events, no beam dump)

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Target length: 80 cmTarget radius: 0.72 cmBeam angle: 65 mradCo-linear target and beamTR/BR=4

Remaining Protons(105 events, no beam dump)

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Target length: 80 cm Target radius: 0.72 cm Beam angle: 65 mrad Co-linear target and beam TR/BR=4

Single Particle Tracking in XZ/YZ plane (no target and beam dump)

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Target length: 80 cm, Target radius: 0.72 cm, Beam angle: 65 mradCo-linear target and beam, TR/BR=4Z=40 cm, x=-0.4 cm, y=-2.562 cm; Z=120 cm, x=-3.097 cm, y=-6.909 cm X=-tan(0.0337)*(z-40)-0.4; Y=-tan(0.05428)*(z-40)-2.562

Remaining Protons with Beam Dump

(105 events)

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Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.72 cmBeam angle: 65 mrad Co-linear target and beam TR/BR=4Beam dump is 120 cm long (z=40 cm to z=160 cm)Beam dump and target have same radius

Remaining Protons with Beam Dump

(105 events)

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Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.72 cmBeam angle: 65 mrad Co-linear target and beam TR/BR=4Beam dump is 120 cm long (z=40 cm to z=160 cm)The radius of beam dump is twice that of the target

Remaining Protons with Beam Dump

(105 events)

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Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.72 cmBeam angle: 65 mrad Co-linear target and beam TR/BR=4Beam dump is 120 cm long (z=40 cm to z=160 cm)The radius of beam dump is triple that of the target

Yield Comparison at z=5 m(105 events)

No beam dump

Beam dump (same as target radius)

Beam dump (twice target radius)

Beam dump (triple target radius)

14941 15688 14850 13550

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Target length: 80 cm, Target radius: 0.72 cm, Beam angle: 65 mradCo-linear target and beam, TR/BR=4

Target parameters(Beam angle = 40 mrad)

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Optimized target length is 93 mm and target radius is 0.68 cm when beam angle is fixed at 40 mrad. Co-linear target and beam. TR/BR=4

Single Particle Tracking in XZ/YZ plane (no target and beam dump)

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Target length: 93 cm, Target radius: 0.68 cm, Beam angle: 40 mradCo-linear target and beam, TR/BR=4Z=46.5 cm, x=-0.268 cm, y=-1.628 cm; Z=166.5 cm, x=-3.273 cm, y=-5.242 cm X=-tan(0.025)*(z-46.5)-0.268; Y=-tan(0.0301)*(z-46.5)-1.628

Target parameters(Beam angle = 0 mrad)

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Optimized target length is 80 mm and target radius is 0.64 cm when beam angle is fixed at 0 mrad. Co-linear target and beam. TR/BR=4

Remaining Protons104 events, no beam dump

Beam angle = 0 mrad

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Remaining Protons104 events, no beam dump

Beam angle = 0 mrad

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Remaining Protons (KE>6 GeV)104 events, Beam angle = 0 mrad

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No beam dumpBeam dump:120cm long,Triple of target radius

Remaining Protons with Beam Dump

(104 events, Beam angle = 0 mrad)

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Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.64 cmBeam angle: 0 mrad Co-linear target and beam TR/BR=4Beam dump is 120 cm long (z=40 cm to z=160 cm)The radius of beam dump is triple that of the target

Comparison of remaining protons104 events, Beam angle = 0 mrad

Z KE>6 KE>4.5

No beam dump 0.4m 2326 4183

1.8m 2288 3262

2.8m 2288 3051

4.2m 2285 2861

5m 2130 2342

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Z KE>6 KE>4.5

beam dump rod(120 cm long, triple of the target radius)

0.4m 2256 4209

1.8m 655 1962

2.8m 655 1676

4.2m 649 1283

5m 524 1740

Comparison of remaining protons104 events, Beam angle = 0 mrad

Z KE>6 KE>4.5

beam dump rod(120 cm long, twice of the target radius)

0.4m 2319 4223

1.8m 1027 2281

2.8m 1027 2022

4.2m 1022 1675

5m 893 1088

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Z KE>6 KE>4.5

beam dump rod(120 cm long, same to the target radius)

0.4m 2208 4097

1.8m 1501 2719

2.8m 1501 2448

4.2m 1492 2153

5m 1348 1584

Comparison of remaining protons104 events, Beam angle = 0 mrad

Z KE>6 KE>4.5

beam dump(80 cm long, triple of the target radius)

0.4m 2308 4192

1.8m 767 2091

2.8m 767 1757

4.2m 762 1393

5m 639 846

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Z KE>6 KE>4.5

beam dump(80 cm long, twice of the target radius)

0.4m 2275 4169

1.8m 1030 2320

2.8m 1030 2014

4.2m 1025 1686

5m 886 1099

Comparison of remaining protons104 events, Beam angle = 0 mrad

Z KE>6 KE>4.5

beam dump rod(40 cm long, triple of the target radius)

0.4m 2342 4115

1.8m 1145 2298

2.8m 1145 2048

4.2m 1142 1753

5m 997 11853/27/14 28

Z KE>6 KE>4.5

beam dump rod(80 cm long, same to the target radius)

0.4m 2218 4102

1.8m 1559 2683

2.8m 1559 2424

4.2m 1553 2120

5m 1410 1626

Comparison of remaining protons104 events, Beam angle = 0 mrad

Z KE>6 KE>4.5

beam dump rod(40 cm long, twice of the target radius)

0.4m 2282 4154

1.8m 1381 2564

2.8m 1381 2290

4.2m 1369 1981

5m 1225 1439

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Z KE>6 KE>4.5

beam dump rod(40 cm long, same to the target radius)

0.4m 2329 4126

1.8m 1751 2820

2.8m 1751 2576

4.2m 1747 2333

5m 1596 1817