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Progress in DoNuTS Pelletron Retrofit Operations

Charles Yeamans Domestic Nuclear Threat Security Initiative technical meeting September 16, 2009. Progress in DoNuTS Pelletron Retrofit Operations. 1. Why there is a lot of cursing and a burning smell coming from the basement of Etcheverry Hall but Professor Morse is upstairs. 2. Outline.

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Progress in DoNuTS Pelletron Retrofit Operations

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  1. Charles Yeamans Domestic Nuclear Threat Security Initiative technical meeting September 16, 2009 Progress in DoNuTS Pelletron Retrofit Operations 1

  2. Why there is a lot of cursing and a burning smell coming from the basement of Etcheverry Hall but Professor Morse is upstairs. 2

  3. Outline • Pelletron basics • Timeline, tasks completed • Ongoing tasks • Future tasks and requirements • --Photos by Matt Pistone 3

  4. Current Project • 3.5 MeV Pelletron electron accelerator 4

  5. A Pelletron is a Van de Graaff-type accelerator with a chain of discrete steel pellets connected by insulating Teflon linkages instead of a continuous belt. 5

  6. Voltage is supplied to the terminal by rotating the pellet chains through an inductor/suppressor electrode pair that is biased by a 60 keV commercial high voltage source. 6

  7. The terminal consists of an inductor/suppressor pair for the high-voltage end of the charging system, an electron source*, focusing and steering components*, and control electronics*. *not pictured 7

  8. The electron beam is accelerated in a tube consisting of a series of ceramic rings, connected with 370 MW resistors placed across the spark gaps to create a linear acceleration potential. 8

  9. The chains, chain motors, high-voltage terminal, and other hardware are contained in a pressure tank. Pressurizing the tank to 80 psi with SF6 allows the terminal to be run at the full rated voltage. 9

  10. Pelletron timeline, 2008: June-August: Major cleanout operations in 1140 Etcheverry create space for new experiments, specifically the Pelletron. September: Pelletron pressure tank and ~70 tons of its closest friends arrive in Berkeley. Everything is stored in 1140. 10

  11. Pelletron timeline, 2009: January: Tank is lifted into its current position on concrete piers by Morse, Mozin, Quiter. March: Yeamans hired, more cleaning April: SF6 arrives, task completed: taking delivery of the Pelletron continued lab cleaning and organization May-June: Undergraduate trainees begin their training by cleaning the lab, task completed: 1140 Etcheverry clean enough to be functional July: New beam tube arrives 11

  12. July, 2009: The new beam tube arrives. 12

  13. Pelletron timeline, 2009: • July 22-24, 2009: 1st Workshop on Special Topics in Homeland Nuclear Security 13

  14. Undergrads effectively staffed the event. 14

  15. Prof. Morse represented the DoNuTS Initiative in the plenary session and entertained various dignitaries. 15

  16. The poster session was enlightening. 16

  17. There was much discussion. 17

  18. A lab tour concluded the workshop. 18

  19. A lab tour concluded the workshop. 19

  20. A lab tour concluded the workshop. 20

  21. A lab tour concluded the workshop. 21

  22. A lab tour concluded the workshop. 22

  23. Pelletron timeline, 2009: July 27-31: Fun stuff • tandem terminal disassembled and removed • Former low-energy acceleration tube removed from tank • New electron acceleration tube inserted into tank 23

  24. Completed task: New electron acceleration tube inserted into tank Pelletron timeline, 2009: 24

  25. New DoNuTS Website Completed, though can take content updates as available. 25

  26. Ongoing Tasks • beamline assembly • terminal retrofit • shielding design and dose calculation • interlock • licensing and regulatory compliance 26

  27. Ongoing Tasks:beamline assembly 27

  28. Beamline assembly: reactor room 28

  29. Beamline assembly: current configuration 29

  30. Beamline assembly: current configuration 30

  31. Beamline assembly: proposed alignment 31

  32. Beamline assembly: proposed alignment 32

  33. Ongoing Tasks:terminal retrofit 33

  34. Ongoing Tasks:terminal retrofit The tandem stripper terminal has been disassembled. As soon as components arrive from NEC, the new electron gun terminal can be assembled. 34

  35. Ongoing Tasks:shielding design and dose calculations 35

  36. Dose calculations must be done on proposed beamline alignment and shielding. 36

  37. Ongoing Tasks:interlock 37

  38. The interlock is being built to the current industry standard and will need to withstand a thorough independent design review and functional testing. 38

  39. Ongoing Tasks:licensing and regulatory compliance 39

  40. Ongoing Tasks: regulatory compliance The accelerator must be licensed by the state of California, per NRC agreement. UC Berkeley campus RSO ultimately submits the application, so he gets the last word on safety-related design elements. 40

  41. Future Tasks 0. Shielding design and calculations • Accelerator and beam control system • Beam line assembly • Target 3a. Bremsstrahlung end station 3x. Hair of the Dog • Detectors and data acquisition • Detector characterization 41

  42. Future tasks: Shielding 0. Shielding Calculations (V. Mozin) • 6 months • Required: Monte Carlo calculations of radiation shielding for accelerator licensing and finalizing accelerator footprint. 42

  43. Future tasks: Control System 1. Accelerator / Beam control system • 2 gs-years (1 year – rough system, 1 year refinement) • Required: Design interface for all accelerator control systems, and write control software and basic GUI for all accelerator operations. This is currently being done by CBY and he can continue to do so to until September 2010 or until he is offered a better position. 43

  44. Future tasks: Beam Line 2. Beam Line Assembly • 2 gs-years (1 year – assembly / calculations, 1 year – calibration), though may be concurrent with Accelerator/Beam control period if done by a competent and motivated individual. CBY time on procurement and assembly counts as 2.5x gs time, all other tasks 1.0x. • Required: Do calculations for electron beam optics to determine optimal operating conditions, calibrate Pelletron HV signal and bending magnet settings, and perform beam line hardware procurement and installations as needed. 44

  45. Future tasks: Beam Line (2) • Beam Line Assembly: Hardware • On order: electron gun, getter pump and valve, X-Y steerer and solenoids, voltage controller, larger fiber optic chassis • Necessary electronics, not yet ordered • Electron gun driver and controller • Terminal electronics box 45

  46. Future tasks: Target 3a. Bremsstrahlung end station • 3-6 months with decent undergrad hours available, largely fabrication and assembly • Required: Design and build bremsstrahlung radiator, make stands for W/Pb & detector assemblies, assemble W/Pb detector house. 3b. Hair of the Dog • resonant photon generation through resonance excitation and mechanical Doppler compensation 46

  47. Future tasks: Detectors/DAq 4.Detector Electronics & Data Acquisition System • 3 gs-years (1 year – electronics, 1 year – acquisition system, 1 year - testing) • Required: Design, implement, and build detector electronics and data acquisition system for event-by-event acquisition from up to 8 HPGe detectors. May be optimal to duplicate a sub-set of the STARS/Liberace electronics/acquisition system and/or re-use components of the PFNA system. 47

  48. Future tasks: Detector Characterization 5.Detector Characterization • 3 gs-years • Required: Perform Monte Carlo calculations and experiments to fully characterize HPGe dectector array. This includes shielding optimization. Benchmark against Angell/Norman results and then expand. 48

  49. Future Work… Q: When will the Pelletron be operational so I can walk in and use it for NRF or other experiments? A1: The probability of the date of first operation is approximately lognormal, starting at May 2010 and having the mode around September 2010. A2: The line forms behind Ed Morse and Rick Norman. 49

  50. questions/comments 50

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