Harold G. Kirk Brookhaven National Laboratory The High-Power Target Experiment at CERN Report to MUTAC LBNL April 25, 2005.

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Presentation transcript:

Harold G. Kirk Brookhaven National Laboratory The High-Power Target Experiment at CERN Report to MUTAC LBNL April 25, 2005

Harold G. Kirk The Goal: Intense Secondary Beams World-wide interest in exploring new physics opportunities via intense new beams l Kaons l Kopio—BNL l CKM—FNAL l LOI’s 4,5,16,19,28 – JPARC l Neutrons l SNS l JAERI/JPARC l Neutrinos n Numi—FNAL n BNL to Homestake n T2K -- JPARC l Muons l g-2 – BNL l Meco – BNL l Sindrum--PSI l Prism- JPARC l Neutrino Factory/Muon Collider

Harold G. Kirk Achieving Intense Muon Beams Maximize Pion/Muon Production l Soft-pion Production l High Z materials l High Magnetic Field

Harold G. Kirk Neutrino Factory Feasibility Study 2 AGS 1.2 GeV  24 GeV 0.4 s cycle time (2.5 Hz) 116 MeV Drift Tube Linac (first sections of 200 MeV Linac) BOOSTER High Intensity Source plus RFQ Superconducting Linacs To RHIC 400 MeV 800 MeV 1.2 GeV 0.15 s0.1 s0.15 s To Target Station Six 17 TP pulses at an effective 50 Hz rate AGS Proton Driver 1 MW Scenario

Harold G. Kirk The SPL Neutrino Horn Protons I = 300 kA  B  1/R B = 0 Hg Jet 2.2 GeV at 4MW 50 Hz operation

Harold G. Kirk Proposal to Isolde and nToF Committee Participating Institutions 1)RAL 2)CERN 3)KEK 4)BNL 5)ORNL 6)Princeton University Proposal submitted April 26, 2004

Harold G. Kirk Approval --- April 5, 2005

Harold G. Kirk Profile of the Experiment l 24 GeV Proton beam l Up to 28 x Protons (TP) per 2  s spill l Proton beam spot with r ≤ 1.5 mm rms l 1cm diameter Hg Jet l Hg Jet/Proton beam off solenoid axis l Hg Jet 100 mrad l Proton beam 67 mrad l Test 50 Hz operations l 20 m/s Hg Jet l 2 spills separated by 20 ms

Harold G. Kirk PS Beam Characteristics l PS will run in a harmonic 8 mode l We can fill any of the 8 rf buckets with 4 bunches at our discretion. l Each microbunch can contain up to 7 TP. l Fast extraction can accommodate entire 2  s PS fill. l Fast kicker capacitor bank recharges in 11 ms l Extraction at 24 GeV l Beam on target April 2007

Harold G. Kirk PS Extracted Beam Profile

Harold G. Kirk Peak Energy Deposition Neutrino Factories Hg target; 1 MW 24 GeV proton beam; 15 Hz 1cm diameter Hg jet ; 1.5mm x 1.5mm beam spot 100 J/g Hg target; 4 MW 2.2 GeV proton beam; 50 Hz 2cm diameter Hg jet; 3mm x 3mm beam spot 180 J/g E951 Hg target; 4 TP 24 GeV proton beam; σ y =0.3mm x σ x =0.9mm rms beam spot 80 J/g CERN PS (projected) Hg target; 28 TP 24 GeV proton beam 1.2mm x 1.2 mm rms beam spot 180 J/g

Harold G. Kirk Run plan for PS beam spills The PS Beam Profile allows for: l Varying beam charge intensity from 7 TP to 28 TP. l Studying influence of solenoid field strength on beam dispersal (vary B o from 0 to 15T). l Study possible cavitation effects by varying PS spill structure (Pump/Probe) l Study 50 Hz operation.

Harold G. Kirk Target Test Site at CERN

Harold G. Kirk Location of the nTOF11 Experiment TT10 TT2 TT2A ISR (Control Room Location) TT2 Access Shield Blocks nTOF11 Floor Step

Harold G. Kirk Surface above the ISR 6000 l Dewar Access Route One 18kV Sub-station

Harold G. Kirk Power Converter (From SPPS Transfer Line) 8000 Adc, 1000 Vdc Global view Rectifier bridges Passive filter Passive filter capacitors self capacitors DC output Strategy: Refurbishment of the West Area Power Converter, making it compatible with the project requirements

Harold G. Kirk The Experimental Installation Point

Harold G. Kirk The Experimental Footprint 24 GeV Protons

Harold G. Kirk The Hg Jet System Double Containment System, with snout inserted into magnet. Mercury inventory ~ 20 liters. Hydraulic system can deliver up to 1000 psi, to propel mercury at > 20 m/s

Harold G. Kirk Primary Containment – Side View Jet Deflector Hg Jet Z=0 Viewport Secondary Containment Anti-vibration Mechanism Primary Containment Proton Beam

Harold G. Kirk Primary Containment Cross Section Hg Supply Hg Jet Primary Containment Sight Glass Cover Reflector Sight Glass Optics Secondary Containment OD=6.18" (157mm) Magnet Bore ID = 6.38" (162mm)

Harold G. Kirk Optical Diagnostics: Retroreflected Illumination Spherical mirror laser illumination image collection fiber bundle lens

Harold G. Kirk Princeton Nozzle R&D Replaceable Nozzle Head 20 HP Pump Lexan Viewing Channel

Harold G. Kirk The Target Test Facility (TTF) - Basis For ORNL’s Hg Handling Experience Full scale, prototype of SNS Hg flow loop 1400 liters of Hg Used to determine flow characteristics Develop hands on operating experience Assess key remote handling design issues

Harold G. Kirk High-field Pulsed Solenoid l LN 2 Operation l 15 T with 5.5 MW Pulsed Power l 15 cm warm bore l 1 m long beam pipe Peter Titus, MIT

Harold G. Kirk Pulsed Solenoid Performance 15T Peak Field with 5 MVA PS at 80 O K

Harold G. Kirk Fabrication of the Cryostat CVIP has been awarded the contract. The Cryostat pressure vessel Photo taken April 12, 2005

Harold G. Kirk Coil Fabrication The three coil sets Photo taken April 12, 2005 Everson Tesla, Inc has been sub-contracted to fabricate the coils

Harold G. Kirk Cryosytem Layout LN 2 and He gas stored on the surface. Cold valve box in the TT2 tunnel. Exhaust gas vented to surface through filtration system. ~ 150 liters of LN 2 per Magnet pulse. Magnet flushed with He prior to each pulse, to minimize activation of N 2.

Harold G. Kirk System Commissioning l Ship Pulsed Solenoid to MIT July 2005 l Test Solenoid to 15 T peak field August 2005 l Test Cryogenic valve box September 2005 l Integration of Solenoid/Hg Jet system Summer 2006

Harold G. Kirk High-Power Target Experiment Budget agreed to by the Collaboration Technical Board on Sept. 22, Subject to continued flat funding from US DOE. FY05FY06FY07Total Magnet Systems Solenoid Testing Cryogenics Power Supply340 PS Installation50 Decommission30 Hg Jet System Integration Nozzle R&D25 50 Optics25 Fabrication40 Decommission30 Project Management Simulations Experiment Operations50 Total

Harold G. Kirk Summary The CERN nTOF11 experiment is now approved to demonstrate a mercury jet target in a 15-T solenoid plus an intense 24-GeV pulsed proton beam. An international collaboration has completed the design of all major components: Mercury delivery system (ORNL, Princeton) Optical diagnostics (BNL) 15-T, LN2-cooled pulsed solenoid magnet (MIT) 5-8 MVA power supply (BNL,CERN) LN2 cryogenic system (CERN, RAL) The budget is in place to complete fabrication, commissioning and operation of the experiment over the next 2 years. Completion of this experiment in 2007 will bring a successful close to a major phase of R&D for a Neutrino Factory based on a muon storage ring.