Particle Production of Carbon Target with 20Tto2T5m Configuration at 6.75 GeV (Updated) X. Ding, UCLA Target Studies April 3, 2014 14/3/14.

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Presentation transcript:

Particle Production of Carbon Target with 20Tto2T5m Configuration at 6.75 GeV (Updated) X. Ding, UCLA Target Studies April 3, /3/14

Target Setting 20Tto2T5m Configuration (initial beam pipe radius of 13 cm) and Fieldmap (20T  2T); 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: (50 m downstream, 40 MeV < KE < 180 MeV). Graphite density = 1.8 4/3/142

Configuration 4/3/143

Energy Card Setting ENRG E0 EM EPSTAM EMCHR EMNEU EMIGA EMIEL E0: The incident particle kinetic energy; EM: The hadron threshold energy (Default: 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: 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 4/3/144

Particle Production vs. Target Length (10 6 events, no beam dump) 4/3/145 Target radius: 0.80 cm Beam angle to SC axis: 65 mrad Co-linear target and beam TR/BR=4

Particle Production vs. Target Radius (10 6 events, no beam dump) 4/3/146 Target length: 80 cm Beam angle to SC axis: 65 mrad Co-linear target and beam TR/BR=4

Particle Production vs. Beam Angle (10 6 events, no beam dump) 4/3/147 Target length: 80 cm Target radius: 0.80 cm Co-linear target and beam TR/BR=4

Energy Spectra of  , K ,   (10 6 events, no beam dump) 4/3/148 Best parameters: Target length: 80 cm Target radius: 0.80 cm Beam angle: 65 mrad Co-linear target and beam TR/BR=4

Remaining Protons (10 6 events, no beam dump) 4/3/149 Target length: 80 cm Target radius: 0.80 cm Beam angle: 65 mrad Co-linear target and beam TR/BR=4 Peak of protons(?) at 6.5 GeV gone at z = 16, 50 m. If true, no need for beam dump.

Remaining Protons with Beam Dump (10 6 events) 4/3/1410 Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.80 cm Beam angle: 65 mrad Co-linear target and beam TR/BR=4 Beam dump rod: (z=40 cm to z=160 cm, horizontal tilt: 33.7 mrad, vertical tilt: mrad) The radius of beam dump is same that of the target

Remaining Protons with Beam Dump (10 6 events) 4/3/1411 Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.80 cm Beam angle: 65 mrad Co-linear target and beam TR/BR=4 Beam dump rod (z=40 cm to z=160 cm, horizontal tilt: 33.7 mrad, vertical tilt: mrad) The radius of beam dump is twice that of the target

Remaining Protons with Beam Dump (10 6 events) 4/3/1412 Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.80 cm Beam angle: 65 mrad Co-linear target and beam TR/BR=4 Beam dump rod (z=40 cm to z=160 cm, horizontal tilt: 33.7 mrad, vertical tilt: mrad) The radius of beam dump is triple that of the target

Yield Comparison (no-tilt vs. tilt of proton beam to SC axis) 4/3/1413 Optimized target length is 80 cm and target radius is 0.64 cm when beam angle is fixed at 0 mrad. Co-linear target and beam. TR/BR=4 ~ 13% advantage to tilting the beam/target

Remaining Protons (KE > 0) 10 4 events, no beam dump, beam angle = 0 mrad 4/3/1414 z = 0.4 m z = 1.6 m

Remaining Protons (KE > 0) 10 4 events, no beam dump, beam angle = 0 mrad 4/3/1415 z = 5 m z = 50 m

Remaining Protons (KE > 6 GeV) 10 4 events, Beam angle = 0 mrad, target radius = 0.64 cm 4/3/1416 No beam dump Beam dump: 120cm long (z=40 to 160 cm), Triple of target radius z = 5 m

Remaining Protons with Beam Dump (10 6 events, Beam angle = 0 mrad) 4/3/1417 Target length: 80 cm (z=-40 cm to z=40 cm) Target radius: 0.64 cm Beam angle: 0 mrad Co-linear target and beam TR/BR=4 Beam dump rod is 120 cm long (z=40 cm to z=160 cm) The radius of beam dump is triple that of the target ? This plot shows a peak at GeV for z = 16, 50 m ??

Counting 10 4 events, 1MW beam, beam angle = 0 mrad L dump (cm) R dump / R target ZTotal KE (protons) ( r <23 cm) GeV Total KE (non-protons) GeV Protons KE>6 Protons KE>4.5 Yield at Z=50m 005m m m m m m m m m m /3/1418