1. Front End Technologies Harold Kirk Brookhaven National Laboratory February 19, 2014

2. The Front End Technology Challenges Target Chicane RF for Buncher/Rotator Ionization cooling (MICE/Cooling talks to follow) Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 2

3. Technology Challenges Target and Capture –3 GJ (15T, 2.4m ID ) superconducting solenoid –Shielding for SC coils surrounding the target –Replaceable Target Module (Solid or Liquid) –Beam dump (splash mitigation if liquid target) Chicane –Field requirements (B ≥ 2T) –Shielding for SC coils RF for Buncher/Rotator –325 MHz with 20 MV/m in B ≥ 2T field Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 3

4. Liquid Target System Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 4 4MW Candidate materials: Hg, Ga, PbBi Use of Ga results in ~15% loss in muon production

5. A Solid Target System February 19, 2014 Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)5 He-cooled W-balls shielding Target Module

6. Solid Target Module February 19, 2014 Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)6 75 cm Carbon Rod 75 cm Carbon Beam Dump 1 MW Candidate material: Carbon 4 Interaction Lengths 1% unspent primary proton beam

7. Drive Beam Energy Budget The primary beam energy goes to: ~10% into the Target Module ~15% conduced downstream ~ 75 % into the volume immediately surrounding the target module February 19, 2014 Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014)7

8. He Cooled Shielding 75% of beam power absorbed in target shield Shielding concept: 97% pure Tungsten balls 60% packing fraction He gas flow cooled –W and H 2 O are incompatible –Reduce activation products (e.g., tritium) Thermal engineering required to establish feasibility Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 8

9. Liquid Target Issues Jet delivery (Nozzle Design) Splash Mitigation –20 m/s could cause significant disruption of the liquid in the collection system –Potential to disrupt particle production –Chosen solution will need to be bench tested Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 9

10. Chicane Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) Push toward higher decay channel B fields (≥2T) will require SC coils A credible shielding solution will be needed P. Snopok, IIT,FNAL C. Rogers, RAL February 19, 2014 10

11. Buncher/Phase Rotator Require 325MHz, 20 MV/m, B ≥ 2T Gradient corresponds to: – 201MHz: 16 MV/m – 805 MHz : 32 MV/m MTA rso far: 805 MHZ, 20 MV/m, B=5T Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 11

12. Summary Front End technical challenges include: Shielding for the target and capture solenoids Shielding solution for the chicane. The liquid delivery system –An improved jet stream –Splash mitigation of the 20-m/s jet in the liquid collector Operation of high-gradient 325 MHz cavities in fields B ≥ 2T Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 12

13. Backup Slides Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 13

14. 15T Liquid Target Solution Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 14

15. Utility Connections for 15T System Shielding Helium Remote Handling Features Nozzle Supply Beam Entrance Vent Mercury Drains Mercury Vessel Helium Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 15

16. Liquid Target System Core Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) He-cooled W-balls shielding Splash mitigation Hg delivery system February 19, 2014 16

17. MERIT Beam Pipe Simulations Y. Zhan, Stony Brook Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) February 19, 2014 17

18. Free Jet Simulations Harold Kirk, BNL | DOE Review of MAP (FNAL, February 19-20, 2014) T = 16 ms T = 111 ms T = 180 ms 20 m/s Hg Jet in air Results encouraging, but: Nozzle is simple circular orifice 2D simulation—need 3D February 19, 2014 18