A Free Jet Hg Target Operating in a High Magnetic Field Intersecting a High Power Proton Beam Van Graves, ORNL P. Spampinato,T. Gabriel, ORNL H. Kirk,

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Presentation transcript:

A Free Jet Hg Target Operating in a High Magnetic Field Intersecting a High Power Proton Beam Van Graves, ORNL P. Spampinato,T. Gabriel, ORNL H. Kirk, N. Simos, T. Tsang, BNL K. McDonald, Princeton P. Titus, MIT A. Fabich, H. Haseroth, J. Lettry, CERN International Conference on Accelerator Applications 2005 Venice, Italy August 29 – Sept 1, 2005

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 2 AccApp05 Background  Proof-of-principle experiment to investigate the interaction of a proton beam with a high-Z target (Hg) inside a high-strength magnetic field  Primary diagnostic for the beam-jet interaction is optical  Similar to a high-power production target needed for a neutrino factory or muon collider  Experiment approved by CERN Research Board  CERN designation nToF11  Collaboration designation MErcury Intense Target (MERIT)  Scheduled for April 2007

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 3 AccApp05 Participants  BNL, Princeton – project oversight, nozzle development, beam window design, optical diagnostics  MIT – magnet design & fabrication  ORNL – Hg target system design & fabrication  RAL – magnet cryogenics  CERN – proton beam & facility interfaces

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 4 AccApp05 Prior Work  E951 Tests (H.Kirk - BNL)  1cm dia, 2.5m/s Hg jet  24 GeV 4TP beam  No magnetic field  Jet dispersal observed  CERN/Grenoble Tests (A.Fabich,J.Lettry - NuFACT’02)  4cm dia, 12m/s Hg jet  0,10,20T magnetic field  No proton beam  Jet stabilization with increasing field

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 5 AccApp05 Experiment Profile  Hg Jet  1-cm diameter, 20 m/s, delivered to coincide with magnet peak field  Required flow rate of 1.57 liter/s  Magnet  15 Tesla magnetic field  Peak field duration ~1 sec  Magnet cool-down time ~30 minutes  Environment  24 GeV proton beam, up to 28x10 12 (TP) per 2μs spill  1-atm air environment inside target delivery system primary containment  Total integrated dose 10 4 rads  Geometry  Hg jet 100 mrad off magnet axis  Proton beam 67 mrad off magnet axis  Jet intersects beam at magnet Z=0  Up to 100 beam pulses for the CERN test delivered in a pulse-on-demand mode

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 6 AccApp05 Experiment Layout  Hg target is a self- contained module inserted into the magnet bore  Two containment barriers between the Hg and the tunnel environment

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 7 AccApp05 Hg System Schematic

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 8 AccApp05 Mercury Delivery System  Hydraulically-actuated piston pump delivers Hg to the nozzle  Hg cylinder 25-cm (10-inch) bore, 38-cm (15-inch) stroke  Q = 1.5 liter/s (25 gal/min), piston Vel = 3.0 cm/s (1.2 inch/s)  Provides jet duration up to 12s, requires approx 23 liters Hg  Two drive cylinders 15-cm (6-in) bore, powered by 45 liter/min (12 gal/min), 2.1 MPa (3000psi) pump  Primary containment SS304L/316L  Gravity fed from sump tank Hg Supply Tube (rigid) Flex Hoses Check Valve Shut-off Valve Sump Tank Tie-beam Ti 6 AlV 4 Beam Window

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 9 AccApp05 Target Module Primary Containment Weldment ¼-inch SS Plate Flared Outside Magnet O/A Length 1.6m Optical Diagnostics Hg Plenum Hg Supply Jet Exit Reflector Assemblies Beam Windows Hg Jet Path

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 10 AccApp05 Primary Containment Xsec Deflector Hg Jet Hg Plenum Hg Exit Beam Windows Z=0 Viewport Proton Beam Beam Tube w/Window

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 11 AccApp05 Primary Containment Cross Section

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 12 AccApp05 Secondary Containment  SS and Lexan enclosure around entire primary system  Contains Hg vapors/leaks, provides access to monitor Hg vapors  Provides access to optical diagnostics, hydraulics, and sensors  Incorporates beam windows Hydraulic, Sensor, Optic Ports Beam Windows

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 13 AccApp05 Nozzle Tests at Princeton  R&D setup to test various nozzle configurations with mercury  Water testing initiated

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 14 AccApp05 Magnet Description  15-T pulsed solenoid  3-segment, layer-wound fabrication  Conductor: ½-inch square, cold worked OFHC copper  15-cm warm bore  1-m beam pipe  LN 2 cooled (80K) between pulses  For detailed information  ple/titus/#BNL%20Memos

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 15 AccApp05 Equipment Decommissioning/Disposal  The target equipment (and the solenoid) will have neutron- induced activation  Based on (H. Kirk 9/01/04)  200 pulses  16 x protons/pulse (avg.)  30 days of operation  Contact dose rate on the iron exterior will be:  after 1 hr 40 mrad/hr  after 1 day 21 mrad/hr  after 1 week 13 mrad/hr  after 1 mo. 5 mrad/hr  after 1 year 1 mrad/hr  Move experiment out of beam line several days after conclusion  Extract Hg & prepare for shipment after several month cool- down  ORNL will take back the Hg target system and the activated Hg and components

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 16 AccApp05 Test Plan Magnet testing at MITOct - Dec 2005 Hg nozzle tests at Princeton  Iterate nozzle design as needed Oct - Dec 2005 Hg target system testing at ORNL  Includes optical diagnostics  Initially test with water to develop syringe control system  Incorporate Princeton nozzle design, iterate if necessary  Practice Hg fill and extraction  Hg jet characterized April - June 2006 Integrated test at MIT  Practice CERN installation sequence  Hg jet in magnetic field characterized Aug - Sept 2006 Ship system to CERNNov 2006 Experiment scheduled at CERNApril 2007 Prepare Hg system for shipment to ORNL for decommissioning Fall 2007

O AK R IDGE N ATIONAL L ABORATORY U. S. D EPARTMENT OF E NERGY 17 AccApp05 Status  Magnet  Assembly nearing completion  Hg target system  Syringe procurement specification completed  Expect to award fabrication contract in Oct 2005  Estimate delivery to ORNL Feb 2006  Remainder of system design complete Oct 2005  Fabrication & delivery to coincide with syringe scheduled delivery  Optical diagnostics  Most components have been selected  Investigating rad-hard fiber bundles  CERN  Facility interfaces being defined  Preparations being made for magnet power supply installation