1. IDS-NF Target Studies H. Kirk (BNL) July 8, 2009

2. Target Studies Progress Study2 vs Study2a Field Taper Analysis MARS15 Meson Production Analysis Target Cryostat Engineering

3. The Study2 Solenoid Layout

4. The Study2a Solenoid Layout

5. The Field Tapers

6. Study2 – Study2a Meson Production G. Prior PIDs-- 3:π + 4:π - 7:μ + 8:μ - PID

7. Study2a Solenoid Current Densities P. Loveridge Engineering Current Limits

8. Commentary No meson production advantage observed for Study 2a field taper Study2a Solenoid current densities out of practical range Study2 configuration preferred-But: Radiation limits for 4MW Study2 configuration must be reviewed Study2 field tapers to 1.25T (not 1.75T)

9. Optimized Meson Production Production of soft pions is most efficient for a Hg target at E p ~ 6-8 GeV, Confirmation of low-energy dropoff by FLUKA highly desirable. Radius Previous baseline 0.5cm Beam Angle Previous baseline 67 mrad Beam/Jet Crossing Angle Previous baseline 33mrad X. Ding, UCLA

10. Meson Production Efficiency Before/After Optimization Normalized to Peak effienciecy MARS15 at 50m; ICOOL at end Of cooling channel X. Ding

11. 6/23/201511 Path Length of Proton Beam inside the Mercury Jet

12. The Required Position of Beam to Jet at z=-75cm to Keep Same Crossing Angle and 24 0 Roll Angle Apart at z=-37.5cm p0 p8 p4 p12 jet Possible multiple proton beam entry points

13. Iron Plug Proton Beam Nozzle Tube SC-1 SC-2 SC-3SC-4 SC-5 Window Mercury Drains Mercury Pool Water-cooled Tungsten Shield Mercury Jet Resistive Magnets Neutrino Factory Study 2 Target Concept ORNL/VG Mar2009 Splash Mitigator The Study 2 Target System Van Graves, ORNL

14. Front Drain Views Investigated possibility of having the Hg drain from the nozzle end of the cryostat Based on Study 2 cryostat layout Hg Outlet

15. Cross Section View Mercury Chamber extends forward under resistive magnets Allows the mercury exiting the vessel to flow out the front of the cryostat

16. The Jet/Beam Dump Interaction T. Davonne, RAL

17. Fluka Simulation - Energy deposition in mercury pool with 24GeV beam T. Davonne, RAL

18. Splash Mitigation Study 2 assumed a particle bed of tungsten balls to minimize effects of jet entering pool Many other feasible concepts to accomplish this function Pool circulation and drainage locations also need to be studied Prototypic testing needed for comparison & final determination