2016-Jun-13 Diagnostic Development Biweekly Report

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Kevin Jordan

  • Working on bits & pieces for the 125 MeV dump Gallium isotope exposure and on the LERF isotope production proposal
  • Getting additional parts ready for beam time at HZDR in late June
  • Working with computer center on connecting and commissioning the 3D printer
  • Wrote abstract for IBIC 2016
  • Mentoring my student Marika Whitlatch


Joe Gubeli

  • HZDR Imager Optics redesigned to fit – Model finished, drawings submitted for fabrication and parts ordered
  • HZDR Fiber coupler support stand redesigned to mount to the flange – Model finished, drawings submitted for fabrication and parts ordered
  • LERF Imager Optics – Drawings submitted for fabrication and parts ordered
  • Isotope Production – Working on the thermal and stress distribution of the Be Vacuum window


Mike Tiefenback

    Weeks 2016-05-14 through 2016-05-27
  • retrieve/uncover rayTrace procedures and improve data analysis scripts minor changes requested of software folks
  • more effort to unravel 2R optical error in CEBAF more effort to understand nonlinear dispersion showing up in 4L (2nd pass South Linac). Turned out most likely was visible from earlier nonlinear dispersion (1A?) being made visible by huge beta blowup. This conclusion was driven by rayTrace measurements which demonstrated (huge) beta blowup not seen by other tools
  • continuing support for PRad experiment
  • Preparing for summer students -- mentors meeting, etc weeks 2016-05-28 through 2016-06-10
  • More PRad support continuing weekdays and some on weekends. Spent Saturday June 4 doing PRad tuning for data taking
  • Undergrad summer students arrive. Paul Ellison new student -- process magnet B(I) data to avoid avoidable interpolation errors; Mike Hennessey returning student continuing on multipass steering analysis and application.
  • Determine where Hall B optics is scrambled and roughly how
  • Preparing for CLAS12 Collaboration meeting talk next week
  • Preparing for 2nd pass PRad setup next week. Analysis of accelerator performance for PRad (energy stability, orbit and envelope stability).
  • Continuing consultation with Dennis Turner about qsUtility and zigzag harp utilization -- improvements on horizon. Angling for opportunity to test resolution of gradient calibration via time-of-flight to answer linearity questions.
  • elog https://logbooks.jlab.org/entry/3408487 suggestion for tuning dispersion quickly using optical diagnostics. Present tools are clumsy, inconsistent, and too easily misread. They require significant dP to use. May be possible to use (temporarily enlarged) intra-beam energy spread to null dispersion visually and quickly rather than use part per thousand step deviations if images are clearly interpretable.
  • I brought up some separate items to you today in our conversation:
    1. Possible patent disclosures
    - Dogleg magnet (example) application of magnetically hard steel to replace separate shunt control in things like chicanes. Use stickiness of magnetic domains to replace fine shunt control if application can support time sequence to save controls/powerSupply costs.
    - MXR2T06 common dipole SLM to render Lambertson viewer (generally) unnecessary. Imaging light from start of common dipole fixes the floor Z coordinate for emission. Geometry from camera system provides (x,x',y,y') from imaging. Locate light fan using slot lenses (e.g., cut from a monolithic lens) and glued together so light from adjacent slots focuses onto different image points. Adjust camera and lens orientation until one image fades almost out. This locates the Sync. Light fan on the lens. Appears to provide all that is needed for an optical BPM.
    2. support requested procedurally for pushing "hot-wire" (superconducting) anemometer for mass flow metrology in accelerator cryo systems. The recent problems with cryogenic load, unknown cryomodule static heat loads, etc, would have been markedly reduced with module by module knowledge of the return vapor flow. Or so it seems to me, and has for a long time.