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Harold G. Kirk Brookhaven National Laboratory The High-Power Target Experiment at CERN High-Power Targetry Workshop Oak Ridge, TN October 10, 2005.

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Presentation on theme: "Harold G. Kirk Brookhaven National Laboratory The High-Power Target Experiment at CERN High-Power Targetry Workshop Oak Ridge, TN October 10, 2005."— Presentation transcript:

1 Harold G. Kirk Brookhaven National Laboratory The High-Power Target Experiment at CERN High-Power Targetry Workshop Oak Ridge, TN October 10, 2005

2 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 PSI-SINQ l JAERI/JPARC l Neutrinos n Numi—FNAL n BNL to Homestake n T2K – JPARC n CNGS—CERN l Muons l g-2 – BNL l Meco – BNL l Sindrum--PSI l Prism- JPARC l Neutrino Factory/Muon Collider

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

4 Harold G. Kirk Optimizing Soft-pion Production

5 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

6 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

7 Harold G. Kirk Neutrino Factory Targetry Concept Capture low P T pions in high-field solenoid Use Hg jet tilted with respect to solenoid axis Use Hg pool as beam dump Engineered solution--P. Spampinato, ORNL

8 Harold G. Kirk E951 Hg Jet Tests 1cm diameter Hg Jet 24 GeV 4 TP Proton Beam No Magnetic Field

9 Harold G. Kirk CERN Passive Hg Thimble Test Exposures to a BNL AGS 24 GeV 2 TP beam. T=0, 0.5, 1.6 and 3.4 ms.

10 Harold G. Kirk Key E951 Results l Hg jet dispersal proportional to beam intensity l Hg jet dispersal ~ 10 m/s for 4 TP 24 GeV beam l Hg jet dispersal velocities ~ ½ times that of “confined thimble” target l Hg dispersal is largely transverse to the jet axis -- longitudinal propagation of pressure waves is suppressed Visible manifestation of jet dispersal delayed 40  s

11 Harold G. Kirk CERN/Grenoble Hg Jet Tests 4 mm diameter Hg Jet v = 12 m/s 0, 10, 20T Magnetic Field No Proton Beam A. Fabich, J. Lettry Nufact’02

12 Harold G. Kirk Key Jet/Magnetic Field Results l The Hg jet is stabilized by the 20 T magnetic field l Minimal jet deflection for 100 mrad angle of entry l Jet velocity reduced upon entry to the magnetic field

13 Harold G. Kirk Bringing it all Together We wish to perform a proof-of-principle test which will include: l A high-power intense proton beam (16 to 32 TP per pulse) l A high (> 15T) solenoidal field l A high (> 10m/s) velocity Hg jet l A ~1cm diameter Hg jet Experimental goals include: l Studies of 1cm diameter jet entering a 15T solenoid magnet l Studies of the Hg jet dispersal provoked by an intense pulse of a proton beam in a high solenoidal field l Studies of the influence of entry angle on jet performance l Confirm Neutrino factory/Muon Collider Targetry concept

14 Harold G. Kirk Simulations at BNL (Samulyak) Gaussian energy deposition profile Peaked at 100 J/g. Times run from 0 to 124  s. Jet dispersal at t=100  s with magnetic Field varying from B=0 to 10T

15 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

16 Harold G. Kirk Approval --- April 4, 2005

17 Harold G. Kirk Profile of the Experiment l 24 GeV Proton beam l Up to 28 x 10 12 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

18 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 Partial/multiple extraction possible at 14 GeV l Beam on target April 2007

19 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

20 Harold G. Kirk Run plan for PS beam spills The PS Beam Profile allows for: l Varying beam charge intensity from 5 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.

21 Harold G. Kirk PS Extracted Beam Profile

22 Harold G. Kirk MERIT EXPT TARGETS MARS15

23 Harold G. Kirk Target Test Site at CERN

24 Harold G. Kirk

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

26 Harold G. Kirk The Footprint of the Experiment MERcury Intense Target

27 Harold G. Kirk Hg Jet System Layout

28 Harold G. Kirk High Field Pulsed Solenoid l 80 o K Operation l 15 T with 5.5 MW Pulsed Power l 15 cm warm bore l 1 m long beam pipe Peter Titus, MIT

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

30 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

31 Harold G. Kirk Coils Installation The 3 Coils Nested August, 2005 Coils inserted into pressure vessel September, 2005

32 Harold G. Kirk Cryosytem Layout LN 2 and N 2 gas stored on the surface. Cold valve box in the TT2 tunnel. Exhaust gas vented into TT10 tunnel through filtration system. ~ 150 liters of LN 2 per Magnet pulse. Magnet flushed with N 2 prior to each pulse, to minimize activation of N 2.

33 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

34 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

35 Harold G. Kirk Primary Containment – Side View Deflector Hg Jet Hg Plenum Hg Exit Beam Windows Z=0 Viewport Proton Beam Beam Tube w/Window

36 Harold G. Kirk Baseline Beam Window Concept

37 Harold G. Kirk Volume of Hg in baffle experiencing pressure from beam interacting with entrance window Beam Window inside Hg/beam interaction volume

38 Harold G. Kirk Hg pressure-induced effects on Jet Nozzle

39 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)

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

41 Harold G. Kirk Fast camera capture of waterjet September 16, 2005 @ Princeton Camera: FastVision 13 capability 1280x1024 pixels, 500 frames/sec, 0.5 sec video or … complete waterjet close-up view of nozzle nozzle: diameter ~8 mm, length 6-inch Measured Waterjet Velocity 12 m/s waterjet closeup at nozzle

42 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

43 Harold G. Kirk System Commissioning l Ship Pulsed Solenoid to MIT October 2005 l Test Solenoid to 15 T peak field November 2005 l Integration of Solenoid/Hg Jet system Summer 2006

44 Harold G. Kirk Target Experiment Milestones Pulsed Solenoid Delivery October, 2005 Pulsed Solenoid at 15T November, 2005 Hg Jet Commisioning Spring, 2006 Solenoid/Hg Jet Integration Summer, 2006 Cryo System test Summer, 2006 The Power Supply Commissioning Fall, 2006 Target Delivery to CERN Fall, 2006 Experiment Commissioning Winter, 2006/2007 Beam on Target April, 2007

45 Harold G. Kirk Summary l Study single beam pulses with intensity up to 28TP l Study influence of solenoid field strength on Hg jet dispersal (B o from 0 to 15T) l Study 50 Hz operations scenario l Study cavitation effects in the Hg jet by varying PS spill structure—Pump/Probe l First beam expected April 2007 l Confirm Neutrino Factory targetry concept The nTOF11 (MERIT) Experiment

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