Inverse Compton Scattering at FAST Alex Murokh (substituting for - - PowerPoint PPT Presentation

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Inverse Compton Scattering at FAST Alex Murokh (substituting for - - PowerPoint PPT Presentation

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Northern Illinois Center for Accelerator and Detector Development Inverse Compton Scattering at FAST Alex Murokh (substituting for Philippe Piot, NIU) RadiaBeam Technologies LLC. Fermilab Workshop on Megawatt Rings and IOTA/FAST

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SLIDE 1

Inverse Compton Scattering at FAST

Alex Murokh (substituting for Philippe Piot, NIU) RadiaBeam Technologies LLC.

Fermilab Workshop on Megawatt Rings and IOTA/FAST Collaboration Meeting, May 10 2018

Northern Illinois Center for Accelerator and Detector Development

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SLIDE 2

Outline

  • Motivation

n and nd background und for ICS program at FAST

  • FA

FAST ICS Project Overview

  • Fut

utur ure opportuni unities at FAST

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SLIDE 3

Monochromatic MeV gamma rays applications

  • Nuclear spectroscopy

and NRF for NP R&D

  • NRF for SNM detection
  • Nuclear waste inspection
  • Medical isotopes

production

  • Stand off active

interrogation via photofission

  • car

cargo

  • insp

specti ction

  • n

J.L. Jones et al., Neutrons Workshop at ONR, 2006

  • Photon energy (MeV)
  • ray beam

detector target

2.0 2.1 2.2

Photon Energy (MeV)

E/E ~ 1% 2.176 MeV for U-238 NRF signal U-238 2.176 MeV

  • R. Hajima, Japan Atomic Agency ERL Group (2008).

ü Mo Motivation ICS at FAST Future opportunities

Slide 3 of 21

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SLIDE 4

Cargo inspection linac system

High intensity linac w/bremsstrahlung target Mock up railroad car Detectors array ü Mo Motivation ICS at FAST Future opportunities

Slide 4 of 21

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SLIDE 5

Disadvantages of the bremsstrahlung source

  • Materials differentiation requires multi-color imaging
  • Bremsstrahlung target produces continuous spectrum

Large exclusion zone Excessive dose on target No stand off capability

ü Mo Motivation ICS at FAST Future opportunities

Slide 5 of 21

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SLIDE 6

Inverse Compton Scattering (ICS)

  • Scattering intense ultrafast optical laser pulse off GeV class e-beam

produces narrow bandwidth directional gamma ray beam

  • Maximum practical photon flux per interaction ~ 107 in 1 % bandwidth
  • Practical applications intensities require 103 — 105 interactions/second

ü Mo Motivation ICS at FAST Future opportunities

Slide 6 of 21

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SLIDE 7

ICS gamma source features

  • Uniqueness – light sources do

not reach MeV

  • Tunability
  • High efficiency at high energy

⁄ Eph Ee ~γ

  • Favorable transverse

brightness scaling (~γ3 )

  • Directionality (~1/γ)
  • Need compactness and high r.r.

(eventually, at the same time)

F.V. Hartemann et al., PR ST AB 8, 100702, 2005

ü Mo Motivation ICS at FAST Future opportunities

Slide 7 of 21

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SLIDE 8

Recirculated ICS experiment

  • Used CO2 active cavity to study ICS in a

pulse train regime (40 MHz)

  • Demonstration for the first time of the

significant ICS photon yield gain via pulse train interaction (2015)

  • A. Ovodenko et al., Appl. Phys. Lett. 109, 253504 (2016)

ü Mo Motivation ICS at FAST Future opportunities

Slide 8 of 21

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SLIDE 9

Inverse Compton Scattering (ICS) at FAST

  • Demonstrate and optimize

ICS performance with SCRF linac at 3 MHz and > 1000 pulses per train

  • Enable high flux tunable
  • utput available for users

and applications R&D

ü Mo Motivation ICS at FAST Future opportunities

Slide 9 of 21

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SLIDE 10

Outline

  • Motivation

n and nd background und for ICS program at FAST

  • FA

FAST ICS Project Overview

  • Fut

utur ure opportuni unities at FAST

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SLIDE 11

11

  • Philippe Piot (NIU faculty + Fermilab Scientist)
  • Daniel Mihalcea (research scientist)
  • Matthew Urfer (MS)
  • Aaron Fetterman (PhD, Joining 5/15)
  • Aleksei Halavanau (Physics student)
  • Alex Murokh (research scientist)
  • Tara Campese (engineering support)
  • Jinhao Ruan (laser scientist)

Team Members & Collaborators

Motivation ü IC ICS a at F FAST Future opportunities

Slide 11 of 21

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SLIDE 12

Technical Objectives

  • Use IR portion of the photoinjector laser output to

develop a high-repetition rate interaction region synched to the existing SRF linac 1. Design, develop, install and commission the interaction region (including ICS chamber and final focus systems) 2. Upgrade the laser currently available 3. Develop a recirculating optical cavity 4. Combine SRF linac with optimized optical cavity to produce high-flux gamma rays

Motivation ü IC ICS a at F FAST Future opportunities

Slide 12 of 21

109 ph/s 1011 ph/s 1013 ph/s ~ 1 ~ 1 Watt

THE PROJECT IS FOCUSED ON THE INTERACTION REGION DEVELOPEMNT (SIMPLIFIED DIAGRAM)

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SLIDE 13

1 meter e l e c t r

  • n
  • b

e a m p a t h i n f r a r e d l a s e r p a t h b a c k s c a t t e r e d g a m m a r a y s Permanent-magnet quadrupoles enhancement cavity vacuum chamber diagnostic block

Schematics of the interaction region

Motivation ü IC ICS a at F FAST Future opportunities

Slide 13 of 21

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SLIDE 14

Beam dynamics optimization

  • Performed cathode-to-IP simulations
  • Comprehensive optimizations

Motivation ü IC ICS a at F FAST Future opportunities

Slide 14 of 21

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SLIDE 15

ICS performance modeling

  • Initial working point at low

charge (~ 100 pC)

Electron beam Laser beam Beam energy 259 MeV Wavelength 1053 nm Beam charge 100 pC Pulse energy 100 mJ Energy spread 0.06 % Bandwidth 0.2 % Emittance (n) 0.34 µm Etendue 0.1 µm Duration 5.0 ps Duration 3.0 ps Beam size x/y 12/13 µm Waist 30 µm Opening angle 100 µrad 200 µrad > 10 mrad Brightness 3.9 x 1018 3.4 x 1018 4.1 x 1017 Flux (photons) 5.1 x 104 3.9 x 105 3.0 x 106 Bandwidth (%) 0.24 % 0.52 % 49.2 % Spectral density 4.0 /eV-s 6.6 /eV-s 1.1 /eV-s

Motivation ü IC ICS a at F FAST Future opportunities

Slide 15 of 21

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SLIDE 16

Present Status

  • Identified beamline location
  • 100-m transport line for IR

pulse under way

  • ne high-energy laser

amplifier has been procured

  • UHV chamber housing IP

under design

  • PMQs in progress

U V t

  • c

a t h

  • d

e IR to ICS interaction point Mirror Box #1

Motivation ü IC ICS a at F FAST Future opportunities

Slide 16 of 21

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SLIDE 17

Outline

  • Motivation

n and nd background und for ICS program at FAST

  • FA

FAST ICS Project Overview

  • Fut

utur ure opportuni unities at FAST

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SLIDE 18

IFEL-ICS-TESSA Optical Energy Recovery

One can go from 1 MeV to 10 MeV using laser acceleration:

  • 1. NCRF 150 MeV injector operating in pulse train mode
  • 2. ~ 10 TW igniter laser (i.e. 1064 nm)
  • 3. IFEL 1 GeV energy booster stage
  • 4. ICS interaction chamber

5.

  • 5. TE

TESSA decelerator for laser power recovery

photoinjector linac 2 x Prebuncher IFEL accelerator Igniter laser ICS TESSA decelerator Beam dump Pockels cell Gamma rays ~ 200 MeV ~ 1 GeV ~ 150 MeV

Motivation ICS at FAST ü Fu Future opportunities

Slide 18 of 21

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SLIDE 19

TESSA decelerator ~ 150 MeV

IFEL+TESSA

photoinjector linac 2 x Prebuncher IFEL accelerator Igniter laser ICS Beam dump Pockels cell Gamma rays ~ 200 MeV ~ 1 GeV GIT simulations (UC UCLA)

Motivation ICS at FAST ü Fu Future opportunities

Slide 19 of 21

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SLIDE 20

200&und& periods& Parameter* Value* ELbeam*energy* 250&MeV& Current* 500&A& Charge* 1&nC& EmiNance* 1&μm& Repe44on*rate* 1&MHz& Undulator*length* 4&m& Laser*wavelength* 1&μm& Rayleigh*range* 48&cm& Laser*waist* 1.8&m& Input*peak*power* 50&GW& Output*peak*power* 127&GW& Net*efficiency* 54%& Average*power* 120*kW*

  • 250&MeV&*&500&A&=&125&GW&peak&beam&power&
  • 250&MeV&*&1&mA&=&250&kW&average&beam&power&
  • Seed&laser&power&is&50&GW&(40%&of&beam&

power)&

  • Diffrac;on&of&s;mulated&radia;on&limits&

undulator&length&to&4&m&to&keep&gap&small&&

  • Prebunching&to&capture&more&(nearly&all)&charge&

increases&net&efficiency&to&50%&

TESSA Oscillator

  • TESSA offers possibility of very high efficiency e-beam to light energy

conversion (~10 % vs. ~0.1 % for a conventional SASE FEL)

Motivation ICS at FAST ü Fu Future opportunities

Slide 20 of 21

  • TESSA offers possibility of very high efficiency e-beam to light energy

conversion (~10 % vs. ~0.1 % for a conventional SASE FEL)

  • There are industrial opportunities for such source (i.e. EUV lithography)
  • The ongoing project at APS LEA beamline will explore TESSA at 266 nm,

and the next step is an SRF linac driven oscillator (TESSO)

TESSA* prebuncher* Igniter&

  • J. Duris et al. TESSO. Under review in

PRAB, arXiv:1704.05030v2

For more info see recent UCLA workshop on high efficiency FEL: https://conferences.pa.ucla.edu/hi gh-efficiency-free-electron-lasers/

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SLIDE 21

Conclusions and Acknowledgement

  • Compact tunable gamma ray source could find multiple

applications

  • FAST facilities offers excellent opportunities to study long

pulse train ICS process and high flux applications

  • NIU-Fermilab-RBT collaboration FAST ICS project is under

construction (experimental phase within a year)

  • In the future, FAST ICS program has a natural synergy with

TESSO, and also IFEL-ICS high duty cycle R&D programs

  • Acknowledgement:

– DNDO ARI support – NIU, Fermilab, RBT personnel contributions and encouragements

  • Thank you !