Multi colour sctintillator based ion beam profiler
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Multi- colour sctintillator -based ion beam profiler. James Green , Oliver Ettlinger , David Neely (CLF / STFC) 2 nd Ion diagnostic workshop June 7-8 th. Talk outline. Diagnostic outline Multi-channel characterisation Reducing EMP & radiation effects Demonstration on Astra Gemini

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Multi- colour sctintillator -based ion beam profiler

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Multi colour sctintillator based ion beam profiler

Multi-coloursctintillator-based ion beam profiler

James Green, Oliver Ettlinger, David Neely

(CLF / STFC)

2nd Ion diagnostic workshop

June 7-8th


Talk outline

Talk outline

  • Diagnostic outline

  • Multi-channel characterisation

  • Reducing EMP & radiation effects

  • Demonstration on Astra Gemini

  • Future developments


High repetition rate advances

High-repetition rate advances

  • Passive media (CR-39, RCF, Image plate) increasing unsuitable

  • Transition to active diagnostics:

    Scintillators, Micro-channel plates (MCPs), Phosphor screens

Scintillators

Target

Lens

Radiochromic film (RCF)

CCD

Ionbeam

Laser

Fibre bundle

Micro-channel plates (MCP)


2d detector head development

2D detector head development

90 mm

100 mm

  • Diagnostic aims:

    • 2D beam profiling

    • Spectral measurement

    • Beam pointing

    • Calorimetry

  • Compact scintillator beam head

    • Scintillator thickness determines energy observation window

    • Each scintillator has a separate central emission wavelength

    • Need to avoid optical excitation within scintillator stack

Detector head

Scintillator 2 (Green)

Scintillator 3 (Blue)

Scintillator 1 (Orange

Incident Protons

Proton stopping ranges


Optical stimulation

Optical Stimulation

  • Optical Stimulation:

    • Emission from Blue or Green scintillators can optically stimulate emission from scintillators earlier in the stack

    • How to stop light travelling back through the system?

Scintillator 2 (Green)

Scintillator 3 (Blue)

Scintillator 1 (Orange

Incident Protons


Reducing emp radiation impact

Reducing EMP / radiation impact

  • High resolution 800 x 800 fibre bundles

    • Image relay from Phosphor / Scintillator to camera outside interaction chamber

    • Durable with flexible deployment options

    • Wide transmission range

    • Long fibre lengths (> 5 m) possible

  • Eliminating background radiation

    • Gated CCDs to block X-ray / electron signal

    • CCD safely shielded from hard hits

Optical

Core

Optical

Cladding

Core

60um

Groups of fibres inside bundle

60um


Channel separation

Channel separation

Green

Red

  • Signal split in front of camera into 4 channels, RGB + Extra

  • Dichroic filters used to isolate each scintillator signal

Data obtained using from SRIM – http://www.SRIM.org

All channels

Blue


Data deconvolution

Data Deconvolution

  • System characterised using a Cyclotron proton source

  • Produced a response matrix for each colour channel

  • Predicted Response Matrix

    • Ideally require 1 on the diagonal,

    • with 0 everywhere else


Astra gemini experiment

Astra Gemini experiment

  • Astra Gemini –

    • 12J 50fs

    • 5x1020 Wcm-2

    • >1010 contrast

    • TCC – Scintillator = 20 cm

1 - 4.5 MeV

7-9 MeV

10.5 - 14 MeV

Scintillator 2 (Green)

Scintillator 3 (Blue)

Scintillator 1 (Orange

Laser

Incident Protons


Astra gemini experiment1

Astra Gemini experiment

  • Shot a range of Al foils, 25-900 nm

  • Clear signals on orange and green channels, insufficient flux for blue

  • Clear structure visible with peak off axis for some shots

1- 4.5 MeV

7-9 MeV

10.5-14 MeV

50 nm Al

100 nm Al

FOV = 30o


Imaging novel targetry

Imaging novel targetry

RCF

  • Microspoke targets shot on Astra Gemini

  • Proton beam imaged using RCF and Scintillator stack

Scintillator

1mm

Disks: 32um diameter, 40nm thick SiN membranes

Supporting wires: 1µm wide , 40 nm thick

Hole etched through 400μm thick Si.


10 hz operation

10 Hz operation

  • Scintillator considerations:

    • Rapid (s) recovery between shots

    • Minimising high dose damage

  • Implement new Scientific CMOS camera

    • 30 fps continuous full-frame operation

    • Low noise read-out, 16-bit Dynamic range

  • Data analysis

    • Real-time data deconvolution for live beam profiles (Desirable – looking for collaborators?)


Future developments

Future developments

  • Further diagnostic testing

    • 0.05 Hz to 10 Hz progression

    • Efficient data capture and analysis

  • Scintillator development

    • Thin scintillators for high spectral resolution

    • Calibration at higher (> 30 MeV energies)

    • Faster scintillators for fast gating

    • Media lifetime

  • Experimental & industrial collaborations

    • Experimental access on range of facilities

    • Next-gen imaging and scintillator technology


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