The High-Power Target Experiment at CERN Report to

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

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 T 2 K -- 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 Proton Driver 1 MW Scenario To RHIC High Intensity Source plus RFQ To Target Station 116 Me. V Drift Tube Linac (first sections of 200 Me. V Linac) BOOSTER AGS 1. 2 Ge. V 24 Ge. V 0. 4 s cycle time (2. 5 Hz) 400 Me. V Superconducting Linacs 800 Me. V 1. 2 Ge. V Six 17 TP pulses at an effective 50 Hz rate 0. 15 s Harold G. Kirk

The SPL Neutrino Horn 2. 2 Ge. V at 4 MW 50 Hz operation I = 300 k. A p Protons B=0 B 1/R Hg Jet Harold G. Kirk

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

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

Profile of the Experiment 24 Ge. V Proton beam l Up to 28 x 1012 Protons (TP) per 2 s spill l Proton beam spot with r ≤ 1. 5 mm rms l 1 cm 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 l Harold G. Kirk

PS Beam Characteristics 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 Ge. V l Beam on target April 2007 l Harold G. Kirk

PS Extracted Beam Profile Harold G. Kirk

Peak Energy Deposition Neutrino Factories Hg target; 1 MW 24 Ge. V proton beam; 15 Hz 1 cm diameter Hg jet ; 1. 5 mm x 1. 5 mm beam spot Hg target; 4 MW 2. 2 Ge. V proton beam; 50 Hz 2 cm diameter Hg jet; 3 mm x 3 mm beam spot E 951 Hg target; 4 TP 24 Ge. V proton beam; σy=0. 3 mm x σx=0. 9 mm rms beam spot CERN PS (projected) Hg target; 28 TP 24 Ge. V proton beam 1. 2 mm x 1. 2 mm rms beam spot 100 J/g 180 J/g Harold G. Kirk

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

Target Test Site at CERN Harold G. Kirk

Location of the n. TOF 11 Experiment TT 10 TT 2 Access Floor Step n. TOF 11 Shield Blocks ISR (Control Room Location) TT 2 A TT 2 Harold G. Kirk

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

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

The Experimental Installation Point Harold G. Kirk

The Experimental Footprint 24 Ge. V 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 Proton Beam Primary Containment Hg Jet Z=0 Viewport Anti-vibration Mechanism Secondary Containment Harold G. Kirk

Primary Containment Cross Section Sight Glass Primary Containment Sight Glass Cover Hg Jet Reflector Hg Supply Optics Secondary Containment OD=6. 18" (157 mm) Magnet Bore ID = 6. 38" (162 mm) Harold G. Kirk

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

Princeton Nozzle R&D Replaceable Nozzle Head Lexan Viewing Channel 20 HP Pump 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 LN 2 Operation l 15 T with 5. 5 MW Pulsed Power l 15 cm warm bore l 1 m long beam pipe l Peter Titus, MIT Harold G. Kirk

Pulsed Solenoid Performance 15 T 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 Everson Tesla, Inc has been sub-contracted to fabricate the coils The three coil sets Photo taken April 12, 2005 Harold G. Kirk

Cryosytem Layout LN 2 and He gas stored on the surface. Cold valve box in the TT 2 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 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 l Harold G. Kirk

High-Power Target Experiment Budget agreed to by the Collaboration Technical Board on Sept. 22, 2004. FY 05 FY 07 Total 100 200 550 Magnet Systems Solenoid Testing 100 Cryogenics 25 Power Supply Subject to continued flat funding from US DOE. FY 06 340 325 340 PS Installation 50 50 Decommission 30 30 50 210 Hg Jet System Integration 85 75 Nozzle R&D 25 25 50 Optics 25 25 Fabrication 40 40 Decommission 30 30 Project Management 53 75 40 168 Simulations 50 50 50 150 50 50 600 1893 Experiment Operations Total 678 615 Harold G. Kirk

Summary The CERN n. TOF 11 experiment is now approved to demonstrate a mercury jet target in a 15 -T solenoid plus an intense 24 -Ge. V pulsed proton beam. An international collaboration has completed the design of all major components: • Mercury delivery system (ORNL, Princeton) • Optical diagnostics (BNL) • 15 -T, LN 2 -cooled pulsed solenoid magnet (MIT) • 5 -8 MVA power supply (BNL, CERN) • LN 2 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. Harold G. Kirk