Presentation on theme: "6 April 2005Aussois, France BURLE INDUSTRIES Next Generation Large Area Low Cost PMT UNO Collaboration Robert Caracciolo and Richard Leclercq 6 April 2005."— Presentation transcript:
6 April 2005Aussois, France BURLE INDUSTRIES Next Generation Large Area Low Cost PMT UNO Collaboration Robert Caracciolo and Richard Leclercq 6 April 2005 BURLE INDUSTRIES
6 April 2005Aussois, France BURLE INDUSTRIES Overview BURLE INDUSTRIES, INC. Conversion Tubes Power Tubes Real Estate BURLE ELECTRO-OPTICS, INC. BURLE INDUSTRIES GmbH BURLE INDUSTRIES UK LIMITED BURLE deMexico
6 April 2005Aussois, France Core Competencies Conversion Tubes, Lancaster PA Conventional PMT design and fabrication Photocathode processing Image tube design and fabrication PMT Modules Integrated VDN, HVPS, signal processing electronics Power Tubes, Lancaster PA Design and fabrication of vacuum tubes for power generation and switching Plating and environmental testing Ceramic-to-Metal joining techniques BEO, Sturbridge MA Microchannel plates Channel multipliers Fiber optics
6 April 2005Aussois, France PMT Markets Medical Imaging Maintain ~ 30% market share and growing Provide high-volume tubes for both SPECT and PET Have presence in general spectroscopy, scintillation counting, and HEP Targeting the HEP market more aggressively Development of the PLANACON family Cost competitive fast timing PMTs such as the 8575B. SBIR grant to develop large area PMT
6 April 2005Aussois, France Large Area PMT Program Actively working on Phase II objectives of a DOE SBIR to develop a 20” diameter PMT with cost < $0.75/cm 2 of active area, including VDN and cabling Will also develop 2”, 5”, and 8” variants Want to establish close ties with researchers associated with proton-decay and neutrino experiments to aid in development Represents a BURLE commitment to becoming a major player in the HEP market
6 April 2005Aussois, France Phase I Objectives 1)Define the required PMT performance specifications for future proton-decay and neutrino experiments. 2)Review potential PMT bulb designs that are cost-effective in high volume production while being consistent with the requirements in 1 above. 3)Review the various electron multiplier configurations available relative to cost and performance. 4)Consider methods of integrating the components of 2 and 3 to establish a PMT with the proper performance requirements and yet is cost effective for production. 5)Consider cost-effective manufacturing techniques for the PMT designs identified in 4 above. 6)Plan for the capital requirements for manufacturing PMTs as identified in 5 above for delivery times of 5 years and 8 years with quantity of 60,000 20” PMT equivalent.
6 April 2005Aussois, France Requirements ParameterValueUnitsComments Spectral Response nmResponse < 300nm not very useful due to attenuation length in water Cathode QE at 390nm20%Desire as high as possible Collection Efficiency70%Desire as high as possible Gain1 x 10 7 Dark Counts25kcps Desire 3 – 4 kHz at 30 C Transit Time Spread (FWHM)5.5nsDesire 3 ns Photocathode area, head-on~2000cm 2 Sized to give lowest cost per unit area High Voltage+2000VCould be higher Pressure9atmTotal outside – inside pressure difference. Could use acrylic pressure vessel if needed. PackagingVDN + HV and signal cables, hermetically sealed Chemical resistancePure H 2 O
6 April 2005Aussois, France Multiplier Design Table 2. Electron Multiplier Properties ParameterDiscrete MultiplierMCPHAPD Gain (Z-stack or Chevron with discrete 1 st dynode) 10 5 – 10 7 Single electron resolutionGoodVery GoodExcellent Collection efficiencyVery goodGood (Very good if using discrete 1 st dynode) Very Good Operational voltage+2000V+4000V-10,000V CostLowModerate
6 April 2005Aussois, France Photocathode Design Requirements for highest possible QE and lowest possible dark counts are in conflict. Trade-study will be performed and initial PMT builds will be designed to optimize these parameters. Dark counts of 3kcps are possible, but QE will probably be limited to 20% max. Electron multiplier design will influence the dark counts, and will be considered in that design
6 April 2005Aussois, France Phase II Activities Teamed with the Glass Technology Industry to develop the bulb, tooling, and manufacturing approach. Establish a shape yielding good electron optics and mechanical integrity Electron optics studies to establish novel focusing methods Design, tool, and fabricate the electron multiplier. Modify existing exhaust equipment to manufacture prototype PMTs. Manufacture and test prototype PMTs. Perform environmental tests on prototype PMTs including pressure, shock/vibration, and temperature. Adapt existing process equipment for low-cost manufacturing.
6 April 2005Aussois, France Bulb Designs Mushroom Shape Good for electron optics Large neck area allows for focusing electrode Manufacturing approach does not yield consistent results leading to lower mechanical reliability Design is not conducive to modern glass manufacturing technology
6 April 2005Aussois, France Bulb Designs Simple shape, easy to blow Good for electron optics if mount is elevated to middle of bulb Excellent mechanical strength Larger volume than is necessary Small neck implies simpler sealing techniques
6 April 2005Aussois, France Bulb Designs Possible methods to make this shape highly automated Good for electron optics except for edge TTS Good mechanical strength Mount is lower in bulb Good use of volume Small neck implies simpler sealing techniques
6 April 2005Aussois, France System Design
6 April 2005Aussois, France System Design
6 April 2005Aussois, France Ideal Front End Optics Truncated bulb Uniform E- field in front of cathode Small neck TTD ~ 1.5 ns
6 April 2005Aussois, France Electron Optics Optimization Different Vectors for Simulations 2 INCH 5 INCH 8 INCH 20 INCH Build prototypes and test
6 April 2005Aussois, France 2 INCH 3D-MODEL
6 April 2005Aussois, France Coincidence Resolving Time Test PMT LSO 4*4*20 mm ¾” PMT Na22 CFD Start Stop Delay TPHC CFD MCA 1
6 April 2005Aussois, France 8575B 2 Inch Prototype TTD(ns) FWHM(ns)
6 April 2005Aussois, France 2 INCH Anode Uniformity
6 April 2005Aussois, France General Milestones 5 Inch PMT 2 nd Quarter 05. Compare with Sample to Stony Brook. Pressure Test 8 Inch PMT2 nd Quarter 06 20 Inch PMT 4 th Quarter 06
6 April 2005Aussois, France Summary Interfacing with glass and bulb manufacturers to optimize cost- effective bulb design. FEA and environmental testing to validate mechanical integrity of bulb. Employing 2-D and 3-D electron optics models. Cathode to Dy1 fields Dy1 to the electron multiplier fields Design and implement novel focusing elements. Required for a bulb with a small neck. Validated our design concepts on the 2” PMT. Will continue with the 5”, 8”, and 20” PMT’s. Reviewing different photocathode processes and or design to optimize balance of QE and Dark counts.