The MERIT High-Power Target Experiment

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1 The MERIT High-Power Target Experiment 3 rd High-Power Target Workshop Bad Zurzach, Switzerland September 11, 2007 Brookhaven National Laboratory

2 The Neutrino Factory Target Concept Maximize Pion/Muon Production Soft-pion Production High-Z materials High Magnetic Field dn/dke (1/GeV/interacting proton) Meson Production - 16 GeV p + W π π Pion Kinetic Energy, GeV

3 Optimizing Soft-pion Production Courtesy: N. Mokhov GeV on Hg R T = 2.5σ x,y GeV on Hg R T = 2.5σ x,y = 5 mm π +μ π + +μ + Yield at 9 m , 50 mrad, 50 mrad +, 100 mrad, 100 mrad +, 150 mrad, 150 mrad Yield at 9 m Target radius (mm) Tilt angle (mrad)

4 The MERIT (ntof11) Experiment MERcury Intense Target

5 Sectional view of the MERIT Experiment Secondary Containment Syringe Pump Solenoid Jet Chamber Proton Beam Hg Jet Beam Window

6 MERIT Scientific Goals Milestone towards demonstration of a 4MW target concept Study MHD effects of pion capture scheme with Hg-jet and 15T solenoid B = 0T B = 2T B = 4T B = 6T Study jet disruption and cavitation by varying the PS spill structure MERIT: 180 J/g 30TP@24GeV protons 1cm diam. 20m/s Hg-jet mm 2 beam size rms B = 10T m Pump-Probe with Particle Detectors

7 Goals of the MERIT Experiment Study single beam pulses with intensities up to 30TP Study influence of solenoid field strength on Hg jet dispersal (B o from 0 to 15T) Study 50 Hz operations scenario Study cavitation effects in the Hg jet by varying PS spill structure Pump/Probe Confirm Neutrino Factory targetry concept

8 Profile of the Experiment 14 and 24 GeV proton beam Up to >30 x protons (TP) per 2μs spill Proton beam spot with r 1.5 mm rms 1cm diameter Hg Jet Hg Jet/proton beam off solenoid axis Hg Jet 33 mrad Proton beam 67 mrad Test 50 Hz operations 20 m/s Hg Jet

9 Key Experimental Sub-systems 15T Pulsed Solenoid 5 MVA Power Supply LN 2 Cryo-system Hg Jet Delivery System Proton beam (24 and 14 GeV) Diagnostics Optical Particle Detection

10 The Pulsed Solenoid 15T at MIT March 30, 2006 CVIP December 2005

11 The Hg Injection System Syringe pump Hydraulic power unit w/control system Optical diagnostic system Baseplate support structures

12 The Mated Systems at MIT

13 Optical Diagnostics in Secondary Containment One set of optics per viewport T.Tsang, BNL

14 Hg jet runs with pulsed solenoid March 3, MIT FastVision 1 SMD FastVision 2 video camera 20 m/s Hg jet, 7 Tesla field 0.1 ms/frame 2 ms/frame

15 Images of Mercury Jet vs. Magnetic Field (V=15m/s) Viewport 1 Viewport 2 Viewport 3 0 T 15 T H.Park, BNL

16 Site of experiment at CERN

17 The Tunnel Complex Hyd Pump & Controls in TT2 TT10 MERIT ISR (Control Room Location) TT2A TT2

18 Installed in the CERN TT2a Line Before Mating After Mating and Tilting

19 Proton Beam Characteristics PS will run in a harmonic 8 mode We can fill any of the 8 rf buckets with sub-bunches at our discretion. Each microbunch can contain up to 5 TP. Fast extraction can accommodate entire 2μs PS fill. Single turn extraction at 24 GeV Partial/multiple extraction possible at 14 GeV Beam on target October 2007

20 Run plan for the CERN PS beam The PS Beam Profile allows for: Varying beam charge intensity from 5 TP to > 30 TP. Studying influence of solenoid field strength on beam dispersal (vary B o from 0 to 15T). Study possible cavitation effects by varying PS spill structure (Pump/Probe)

21 Summary The MERIT experiment is designed to confirm the Neutrino Factory/Muon Collider targetry concept. It will: validate a target solution for a 4MW primary proton beam facility demonstrate operational rep rates up to 50Hz determine acceptable micro-bunch spacing within the primary proton beam pulse provide a solution for an intense secondary muon beam

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