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New Project Possibilities. Tom Shea October 5, 2006. Motivation. SNS was a uniquely organized project – multilab partnership, “interesting experience” Example: Evolution of SNS Diagnostic Systems Began with 3 labs, each with their own concepts for virtually identical systems

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New project possibilities

New Project Possibilities

Tom Shea

October 5, 2006


Motivation
Motivation

  • SNS was a uniquely organized project – multilab partnership, “interesting experience”

  • Example: Evolution of SNS Diagnostic Systems

    • Began with 3 labs, each with their own concepts for virtually identical systems

    • Almost had 3 linac BPMs, 3 linac BCMs, …

    • Early collaboration meetings helped identify commonality, reduce cost by about 3 M$, produce systems that were useful during first beam

  • More generally, communication performance is correlated with technical performance*.

* Allen, Goldhar, Baker, from 1964 and on.

Controls Brown Bag, October 5, 2006


Organization
Organization

Control flow

Controls Brown Bag, October 5, 2006


Organization1
Organization

Knowledge silos

Controls Brown Bag, October 5, 2006


Probability of communication
Probability of Communication

T. Allen, Sloan WP 165-97, MIT, 1997

Controls Brown Bag, October 5, 2006


Effect of department membership compared to project membership
Effect of Department Membership compared to Project Membership

T. Allen, Sloan WP 165-97, 1997

Controls Brown Bag, October 5, 2006


Target system gamma monitors
Target System Gamma Monitors Membership

  • ASD’s BLM ion chambers

  • Monitor target water and Mercury loops

  • First version: muxed Keithley

  • Version 2.0: COTS preamp, 24 bit ADC per channel, EPICS integration

Roberts, Pennisi, Freeman, Gallmier, ASD and XFD

Controls Brown Bag, October 5, 2006


Target viewscreen data analysis
Target Viewscreen Data Analysis Membership

  • non-linear geometric mapping to correct for optical distortion

  • Correction for viewscreen angle and offset with respect to target

  • BCM data used to provide pulse by pulse normalization. Produces plots of 2D particle distribution - (p/pulse)/mm^2

  • Horizontal and vertical projection to compare with harp and wire scanner results.

  • Calculation and strip chart display of horizontal and vertical centroid and RMS width of beam distribution

  • About 800 GB of data collected. Manually moved some to enterprise network for collaborators to analyze. Manually transformed a few images to text for viewing and sharing. Local copy of Labview required. Metadata in file name.

    • Better way?

Controls Brown Bag, October 5, 2006


Portal architecture and interfaces
Portal Architecture and Interfaces Membership

Steve Miller et al, SNS Science division

Controls Brown Bag, October 5, 2006


Visualizing data via the portal data browser
Visualizing Data via the Portal – Data Browser Membership

MCA Data

ISAW Plot

NeXus

tags

NeXus

Files

metadata

Controls Brown Bag, October 5, 2006


Target viewscreen hardware
Target Viewscreen Hardware Membership

At 2MW, this is a nasty place to be

Controls Brown Bag, October 5, 2006


Degradation due to radiation damage fiber darkening
Degradation due to radiation damage (fiber darkening) Membership

  • Data taken from 5kW run (about 1.7E13 p/pulse at 2Hz)

  • Efficiency corrected for shutter width, beam intensity, exponential decay of photon signal

  • TVS1 shown; TVS2 far worse -> fiber darkening, not much screen damage

  • By end of run, lens and fiber tip received about a Gigarad dose

Controls Brown Bag, October 5, 2006


Viewscreen 2 0 view target nose from upstream
Viewscreen 2.0 – view target nose from upstream Membership

Controls Brown Bag, October 5, 2006


Viewscreen 2 0 reflective optical path
Viewscreen 2.0 – reflective optical path Membership

McManamy, Sheldon, Development Division

Controls Brown Bag, October 5, 2006


Viewscreen 2 0 mirror on proton beam window assembly
Viewscreen 2.0 – Mirror on Proton Beam Window Assembly Membership

Controls Brown Bag, October 5, 2006


Viewscreen 2 0 fiber routing
Viewscreen 2.0 – Fiber routing Membership

Ron Sheldon, Development Division

Controls Brown Bag, October 5, 2006


One option for target viewscreen 2 0 transition radiation no screen
One option for Target Viewscreen 2.0 MembershipTransition Radiation (no screen)

predicted angular distribution of photons from SNS target noseOrders of magnitude less yield than phosphor

Demo at low gamma:5keV electrons @ UMER

Phosphor

OTR

Ralph Fiorito, Don Feldman, U. of Maryland

Controls Brown Bag, October 5, 2006


Viewscreen 2 0 summary
Viewscreen 2.0 Summary Membership

  • Glowing Tungsten Mesh (Near IR, based on Thomsen’s @ PSI)

    • Narrow dynamic range determined ahead of time by wire size.

  • Transition Radiation (Collaboration with Maryland)

    • Low intensity, but prompt

  • Thermal imaging (Long wavelength infrared, could also be used for injection electron catcher)

    • Issue for Viewscreen 2.0: can we transport these wavelengths?

    • Issue at injection: Rad hard IR camera?

  • Temporary phosphor screen

    • How long will it last? Failure modes, remote handling?

      Common Challenges:Helium background - orders of magnitude above OTR?Optical path <-> Radiation damage

      Status: Development approved; PO written to modify proton beam window ass’y; propose we host international workshop (US, Europe, Japan) and perform tests at SNS and LANL.

Controls Brown Bag, October 5, 2006


Imaging in the rtbt
Imaging in the RTBT Membership

  • Test stand for Target Viewscreen technologies – install actuator with multiple screens

  • More robust way to measure beam tilt and other artifacts

Controls Brown Bag, October 5, 2006


Imaging in the rtbt1
Imaging in the RTBT Membership

  • Camera system could be nearly identical to decommissioned Target Viewscreen system, but cables need to run in tunnel and by extraction dump. Switch from Firewire on fiber to GigE vision on Cat6 copper.

Controls Brown Bag, October 5, 2006


Neutron beam imaging
Neutron Beam Imaging Membership

  • Similar to viewcreens for charged particle beams, can also create viewscreen system for neutron beams

    • Special scintillators available for low energy neutrons (i.e. Lithium glass).

    • Probability of capture is inversely proportional to velocity. About 8000 blue photons emitted for each captured neutron. Much higher yield scintillators also being considered.

Controls Brown Bag, October 5, 2006


SANS Membership

Zhao, Billeaux, et. al.

Controls Brown Bag, October 5, 2006


SANS Membership

Controls Brown Bag, October 5, 2006


Sans detectors and beam stop
SANS – detectors and beam stop Membership

Controls Brown Bag, October 5, 2006


Sans transmission monitor
SANS Transmission Monitor Membership

  • Differential particle current measurement

    • Compare to He3 chamber upstream of sample

    • Smaller detector at dump (chamber won’t fit)

    • Equivalent frame rate: 60 kHz (to provide time/energy resolution and deconvolve energy dependent efficiency)

  • Project approved as part of the SANS instrument construction

  • Must be running summer 2007 – early test @ HIFR?

  • Similar imaging system with relaxed specs could be used to check beam on sample - many instrument groups have expressed interest

Controls Brown Bag, October 5, 2006


Science division initiative polarized neutrons why
Science Division Initiative: MembershipPolarized Neutrons – Why?

J. K. Zhao, SNS

Controls Brown Bag, October 5, 2006


Polarized neutrons how
Polarized Neutrons – How? Membership

1970’s custom modules

update w/COTS?

J. K. Zhao, SNS and Don Crabb, University of Virginia

Controls Brown Bag, October 5, 2006


Comparison accelerator and polarized target technologies
Comparison: Accelerator and Polarized Target Technologies Membership

Controls Brown Bag, October 5, 2006


Single shot emittance measurement with pepper pot
Single shot emittance measurement with Pepper Pot Membership

  • Fast checkout of source. Minimize interruption of users program and limit thermal cycling of target.

  • Active development again at GSI, CERN, BNL

  • Possible as part of SNS power upgrade

Controls Brown Bag, October 5, 2006


Help needed in several areas
Help Needed in Several Areas Membership

  • Camera evaluation (identify common requirements, assess interfaces like GigE)

  • Broadband optics design (LWIR through UV)

  • Analog electronics (NMR system)

  • Labview development (primarily imaging systems)

  • Assess applicability of Science division software

  • Explore common interface to EPICS, and instrument DAQ/Sample environment. Share virtually identical systems below that interface point.

  • A lot more where this came from…

Controls Brown Bag, October 5, 2006


What do r d staff want
What do R&D staff want? Membership

Controls Brown Bag, October 5, 2006


Thank you
Thank you Membership

Controls Brown Bag, October 5, 2006


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