Beam Dump for Carbon Target with IDS120h Configuration at 6.75 GeV (Updated) X. Ding, UCLA Target Studies Jan. 24, 2014 11/24/14.

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Beam Dump for Carbon Target with IDS120h Configuration at 6.75 GeV (Updated) X. Ding, UCLA Target Studies Jan. 24, /24/14

IDS120h Geometry 1/24/142 Target + Beam Dump

Fieldmap (IDS120h: peak at 20 T) 1/24/143

Target and Beam Dump Setting IDS120h Configuration (initial beam pipe radius of 7.5 cm) and Fieldmap (20T  1.5T); Code: MARS15(2014) ICEM 4=1; Proton beam: 6.75 GeV (KE) and launched at z = -100 cm, Simple Gaussian Beam (σx=σy=0.145cm), Focal beam with waist (σx=σy=0.145cm) at z=-37.5 cm (beam size at z=0 is 0.145*sqrt(1+L 2 /βx 2 )=0.194 cm) and emittance (σx*σx/βx, βx=42.05 cm) of 5μm; Optimized Target Parameters: target from z = -75 cm to z = 0 cm with center at z = cm, target radius of 0.58 cm, beam radius of cm, same beam and target angle (to SC axis) of 59 mrad. 1/24/144

Target and Beam Dump Setting (cont’d) Production Collection: (50 m downstream, 40 MeV < KE < 180 MeV). Beam dump (except carbon pool) is located immediately downstream the target and co-linear with each other. Case 1: Carbon Pool Case 2: Rod from z = 0 cm to z = 75 cm, tilt angle of 59 mrad to SC axis and radius of 0.58 cm. Case 3: Rod from z = 0 cm to z = 75 cm, tilt angle of 59 mrad to SC axis and radius of 2*0.58 cm. 1/24/145

Target and Beam Dump Setting (cont’d) Case 4: Rod from z = 0 cm to z = 75 cm, tilt angle of 59 mrad to SC axis and radius of 3* 0.58 cm. Case 5: Rod from z = 0 cm to z = 75 cm, tilt angle of 59 mrad to SC axis in the yz plane and tilt angle of *59= 30.9 mrad in the xz plane and radius of 0.58 cm. Case 6: Rod from z = 0 cm to z = 75 cm, tilt angle of 59 mrad to SC axis in the yz plane and tilt angle of *59= 30.9 mrad in the xz plane and radius of 2*0.58 cm. Case 7: Rod from z = 0 cm to z = 75 cm, zero tilt angle to SC axis and radius of 6*0.58 cm. 1/24/146

Dump Configuration (Case1:left, Case 2: right) 1/24/147

Dump Configuration (Case3:left, Case 4: right) 1/24/148

Dump Configuration (Case7) 1/24/149

Single Proton Tracking (KE=6.75 GeV) 1/24/1410 Dump Range (z=0 to z=75cm) Y=-(z+37.5)*tan(0.059) Dump Range (z=0 to z=75cm) x=-(z+37.5)*tan(0.059)*

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=7 2=0.02 3=0.3 4=0.01 5=0.05 6=0.01 7=0.01 1/24/1411

Particle Production and Protons ( events, focal beam of 5 μm) Z (m)Yield (pos)Yield (neg)Yield (sum)Protons (all KE) Protons (KE>=6 GeV) Case Case Case Case /24/1412

Particle Production and Protons ( events, focal beam of 5 μm) Z (m)Yield (pos) Yield (neg)Yield (sum)Protons (all KE) Protons (>= 6 GeV) Case Case Case /24/1413

Energy Spectra of Protons ( events, focal beam of 5 μm) 1/24/1414 Case1 at z=0, 5.5, 50mCase1-7 at z=0m

Energy Spectra of Protons (Cont’d) ( events, focal beam of 5 μm) 1/24/1415 Case1-7 at end of dumpCase1-7 at z=50m

Proton Distribution (z=0m) (Case1-case8, events, focal beam of 5 μm) 1/24/1416 All KE KE = 6 GeV

Proton Distribution (z=0.75m) (Case3, events, focal beam of 5 μm) 1/24/1417 All KE KE = 6 GeV

Proton Distribution (z=0.75m) (Case6, events, focal beam of 5 μm) 1/24/1418 All KE KE = 6 GeV

Proton Distribution (z=50m) (Case3, events, focal beam of 5 μm) 1/24/1419 All KE KE = 6 GeV

Proton Distribution (z=50m) (Case6, events, focal beam of 5 μm) 1/24/1420 All KE KE = 6 GeV