Top Banner

Click here to load reader

Target Injection/Positioning Update Presented by Ron Petzoldt Neil Alexander 1, Lane Carlson 2, Dan Frey 1, Jonathan Hares 3, Dan Goodin 1, Jeremy Stromsoe

Dec 31, 2015

ReportDownload

Documents

  • Target Injection/Positioning UpdatePresented by Ron PetzoldtNeil Alexander1, Lane Carlson2, Dan Frey1, Jonathan Hares3, Dan Goodin1, Jeremy Stromsoe2, and Emanuil Valmianski1

    HAPL Project ReviewSante Fe, NMApril 8-9, 2008General AtomicsUCSDKentech Instruments, UK

    IFT\P2008-015

    Targets are loaded, charged, released, tracked and steered in a vacuum chamber

    3 kV steeringelectrodes (4 rods)MirrorTarget loading and charging CameraLaser10 cm50 cm90 cmTarget charge measurement20 m placement accuracy required

    IFT\P2008-015

    Recent progress in target injection and positioning (target steering)Achieved 13 m final placement repeatabilty (1) in each transverse direction with solid delrin spheres. Centroid Offset X=-3 m, Y= 6 mDesigned, built and tested an improved target release mechanismRevised LABVIEW code to properly feedback charge to mass ratio changes to calculated acceleration, velocity and positionAchieved 9 m X & 7 m Y repeatability (1) with 1 mg shells!Centroid Offset X=-1 m, Y= 4 mImproved charge measurement sensitivityContinued electrostatic accelerator work Procured and tested electrode circuit boardsDesigned, fabricated and began testing electronics and optical components for axial position measurementDesigned vacuum chamber extension and mounting for accelerator components

    IFT\P2008-015

    New release mechanism has reduced system vibration during steering

    3 points of contactSoft stopVibration comparisonStationary targets with mechanism activated

    OldNew4 points of contactHard stop OldNew

    IFT\P2008-015

    Example Labview screen shot shows accurate target steering

    IFT\P2008-015

    Example Labview screen shot shows accurate target steering

    IFT\P2008-015

    We achieved 13 m target positioning repeatability with solid delrin targets

    x = 13 m y = 13 m X offset = -3 m, Y offset = 6 m 23 of 30 in 20 m radius from aim point 2 to 4 times better than best previous results

    IFT\P2008-015

    Charge measurement must be more sensitive for low-charge hollow shells

    Sensitivity improvements Larger resistance to ground Shielding screen Low pass filter Increased amplification Low-leakage op amp300 mg brass sphere-2500 V, -0.25 nCoul1 mg hollow shell-200 V, -0.02 nCoulCharge measurement tube inputOutput to LABVIEW

    Changed to 5 M

    IFT\P2008-015

    Excellent target positioning repeatability achieved with hollow shells

    x = 9 m y = 7 m X offset = -1 m; Y offset = 4 m 27 of 30 in 20 m radius from aim point 5 times improvement!!Last 30 consecutive targets, but we occasionally have had problems Measured target charge changes, initial target transverse velocity increases Probably due to static charge in vicinity of target release Currently correct by venting vacuum and use of polonium strip UV light is possible solution

    IFT\P2008-015

    An electrostatic accelerator provides increased speed and clear tracking beam path

    Electrodes can be printed on circuit boardsNo SteeringSteering

    IFT\P2008-015

    Electrodes and crossing detectors were tested

    1 kV standoff between electrodes on single board demonstratedIF-E99 LED875-1050 W @20 mAIF-D95Photologic DetectorHigh TTL at 1.0 W

    IFT\P2008-015

    We tested the axial position monitoring system

    Detector response using NAND and OR gates

    IFT\P2008-015

    We designed and fabricated circuit boards for LEDs and photo-logic detectorsDetectors24 boardsLEDs24 boardsNANDOR

    IFT\P2008-015

    Extension for vacuum chamber designed to support LEDs and detectors8 boards mounted on each of 6 levels

    IFT\P2008-015

    Summary of injection/positioning progress

    In-flight target steering substantially improvedAchieved 9 m X & 7 m Y repeatability (1) with 1 mg shells!Centroid Offset X = -1 m, Y = 4 mLow-vibration target release mechanism developedImproved charge measurement sensitivityStatic charge issues may require more workElectrostatic accelerator is under constructionProcured and tested electrode circuit boardsDesigned, fabricated and began testing electronics and optical components for axial position measurementDesigned vacuum chamber extension and mounting for accelerator components

Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.