Accelerator Technology HElmholtz iNfrAstructure - the distributed joint Ralph Assmann (DESY) Ulrich Schramm (HZDR) Jens Osterhoff (DESY) - DESY ...
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Jens Osterhoff
… the distributed joint
Accelerator Technology
HElmholtz iNfrAstructure
Ralph Assmann (DESY)
Ulrich Schramm (HZDR) Ulrich Schramm
Jens Osterhoff (DESY)
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
Jens Osterhoff
… the distributed joint
Accelerator Technology
HElmholtz iNfrAstructure
• funded as Helmholtz research
infrastructure (FIS) - visibility
in MT structure ? Ulrich Schramm
• focused on development of two
pillars for ions (Dresden) and
electrons (Hamburg)
• based on strong science in centers
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
… the distributed joint • providing the infrastructure required for
Accelerator Technology bringing compact and cost-effective
plasma accelerators to user readiness
HElmholtz iNfrAstructure
• complementing laser plasma activities
• funded as Helmholtz research with „large scale“ technologies (external
infrastructure (FIS) injection, synchronization, FEL and
• focused on development of two medical applications, pilot user areas
pillars for ions (Dresden) and
electrons (Hamburg) (exactly matching POF-IV scope)
• based on strong science in centers
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
Helmholtz AI initiatives
KALDERA (DESY)
cSTART (KIT)
Penelope (HZDR)
Sinbad (DESY)
2014 2015 2017 2018 --- 2021 2022
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
Installations at flagship facility at DESY are progressing well
Optimized strategic plan to pursue all ATHENAe scientific goals
ARES KALDERA
e
• New strategic elements take into
account development of field since
submission of ATHENA proposal
Medical Compact
• Running plasma accelerators at DESY Applications Photon
(FLASHForward, LUX, PLASMED X) Sources
are now tightly integrated
• The overall scientific goals remain –
we are fully committed to achieve them Plasma Theory and
Source Lab Simulations
• Partners well integrated
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
SINBAD facility houses the core infrastructure at DESY
Overview
• ARES: 150 MeV S-band linac for sub-fs pulses LUX 2
• KALDERA: 1 kHz, 3 J, 30 fs laser system Plasma injector
• LUX 2: kHz compact LPA FEL
• Plasma injector: 50 MeV LPA
kHz PLASMED X
injector for storge ring at KIT
• kHz PLASMED X: LPA-driven
medical imaging application
Not shown: KALDERA
ATHENA plasma source R&D lab
ARES
e
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
The ARES accelerator is ready for first applications
A new tool for accelerator R&D across sub-topics in operation
• Facility for Accelerator R&D (ST2, ST3, ST4) & novel acceleration techniques testbed
• First user beam time (ACHIP collaboration) end of 2020. ARES is open for access.
• Installation of bunch compressor and PolariX Xband TDS foreseen Q1/2021
– required for the production and characterization of ultra-short pulses
• Relative energy stability measured: 5e-05 at 155 MeV
Contact: Florian Burkart (florian.burkart@desy.de)
Target parameters / actual commissioning parameters
50 – 155 MeV 50 – 156 MeV
0.5 – 200 pC 0.1 – 100 pC
Single pulse @ 50 Hz 10 Hz
few fs / sub-fs pulse length 500 – 800 fs
(w/o bunch compression)
norm. emittance: > 1 mm*mrad
< 0.8 mm*mrad
e
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
KALDERA – the new heart to power ATHENAe
kHz LPA drive laser with active feedbacks for improved stability
• KALDERA will be the new drive laser
KALDERA Laser Lab
for ATHENAe • 400 m2
• ISO6 clean room
• With kHz-level repetition rates at TW- • Ready by end of 2021
class peak power, it will enable active
feedback and stabilization for high-
quality LPA electron beams
• Laser under development. LUX 2
Plasma-based FEL
Prototype of white-light-based seeder driven by KALDERA
Plasma Injector
Test injector R&D.
(DESY/KIT/HIJ)
Target area
Spectral stability of new seeder Currently preparing techical
T. Hülsenbusch (DESY) and T. Eichner (UHH)
infrastrcuture
e Contact: Andreas Maier (andreas.maier@desy.de)
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
Partner contributions and activities at ATHENAe
In-vacuum (cryogenic) undulator
LPA-based injection into a 50 MeV compact development
storage ring (cSTART, FLUTE, KIT) (HZB)
preparing for THz
medical imaging
Diagnostics trolley:
Non-destructive,
LPA-wake and beam diagnostics and visualization online beam
Development (HI-Jena) diagnostics using
synchrotron
radiation (HZB)
e
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021
Application oriented laser proton acceleration
h
embedded in the ELBE center for high power radiation sources
• high rep.rate
• high dose rate
• online monitoring
• polarized targets
• Radiobiology
(image guided)
Installation 2021
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021Pulsed magnet beamline for high proton dose-rate irradiation
h
• Efficient capture and tailoring of LPA proton beams – tested at DRACO and PHELIX
20 Gy / shot
5mm sample
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021PENELOPE – the diode pumped PW driver of Athena at HZDR
Joint variable pulse-contrast front-end development
c c h
v v
150J
150fs
0.1/1Hz
Power amplifier installation
in Dresden ongoing
Fast OPA for PHELIX and
Penelope (tests at PHELIX Double CPA / XPW
Transfer of all units in 2021
running) developed at POLARIS
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021Accelerator Technology HElmholtz iNfrAstructure
the place(s) for joint ARD research
Details - partner contributions and activities
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021ATHENAe highlights at HI Jena in diagnostics development
Visualization of relativistic laser pulses in underdense plasma
Schwab et al., PRSTAB 2020
• Polarization-sensitive optical probing of an LPA at JETI (HI-Jena)
• wavelength dependent transmission of probe light observed
• caused by relativistic electron cyclotron resonances (RECRs) in the plasma
• non-invasive diagnostic tool sensitive for local laser intensity
Few-cycle fs-pumped NOPA
with passive ultrabroadband spectral shaping
Tamer et al., Optics Express 2020
• Development of synchronized, few-cycle optical probe pulse at POLARIS
• novel NOPA configuration
• successfully used, e.g for optical probing of evolution of ultra-thin foils in
laser ion acceleration
Emittance measurement with unprecedented precision nm-waistsize
Seidel et al., PRSTAB 2021 measurement by
• Development of ultrasensitive emittance measurement technique beam modulation
• laser interference pattern modulates momentum space
• important for next generation accelerators
• sensitive to nm∙rad emittances
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021LPA-BASED INJECTION INTO A 50 MEV COMPACT STORAGE RING
Goals Environment
50-MeV plasma injector provided by ATHENA to inject into dedicated storage ring Collaboration: DESY, HIJ, KIT
The novel storage ring is in preparation to be build at FLUTE/KIT via the project cSTART Innovationspool ACCLAIM
FLUTE electrons serve as benchmark: for storage ring & for electrons from plasma AI-inspired control of
Status Photons (driving laser)
Intense discussions on parameters to interface LPA-injector and storage ring Electrons (plasma accelerator)
Laser system for FLUTE facility (> 1.5 J, < 25 fs, 10 Hz) ordered Electron transfer line: HIJ, KIT
Tailored cleanroom for laser system in planning
THz imaging (in progress)
Courtesy: J.Schäfer, KIT
Tomography FLUTE Collaboration
Courtesy: S.Funkner, KIT
preparing for THz ARD test facility FLUTE for Dedicated compact storage ring at KIT
medical imaging ST2, ST3, ST4 & DTS - Store ultra-short bunches from FLUTE Plasma injector
- Accept and store LPA-electron bunches design and build-up at DESY
Courtesy: E. Bründermann, KIT
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021Lab operation
New ATHENAe plasma R&D laboratory starts April 2021
Optimized for the study and development of discharge-based plasma sources
ATHENA projects require discharge plasma sources for Two-color interferometry
guided plasma wakefield accelerators and active plasma lenses. MHz discharges
Multi-species plasma
A new lab under construction at DESY
• Supports flexible plasma cell designs for
robust operation and high rep-rate - kHz to MHz
• Plasma emission spectroscopy for density profile
diagnosis. Sensitivity: 1014 - 1018 cm3
• Longitudinal two-color laser interferometry
• High-sensitivity transverse interferometry
(in collaboration with HI Jena) Laser
• Cell temperature characterization and active
cooling for high rep-rates Plasma
emission
• Ti:Sa system: kHz laser guiding studies
Spectroscopic plasma density profile
J.M. Garland et. al., Rev. Sci. Inst. 92, 013505 (2021)
Flexible test chamber
Contact: Jimmy Garland (matthew.james.garland@desy.de)
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021HZB progress in diagnostics and undulator R&D
In-Vacuum APPLE IVUE-32 Magnetic length: 2.5m
Dignostics Trolley Period length: 32mm
Minimum gap: 7mm
Operation at: 300K
The design can easily be
Non-destructive, adopted to cryogenic ID
online beam
diagnostics using
synchrotron radiation
Cryogenic In-Vacuum APPLE CIVUE-15 Force compensation and magnet
soldering based on R&D carried
out for IVUE-32
Proof-of-concept experiment for DSM/IBSM at low Period length: 15 mm
intensities at MLS accelerator at HZB in 2020 Minimum gap: 2 mm
• Ongoing discussion on specs for Operation at: 77 K
Plasma Injector for cSTART Polarisation: Variable
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021GSI update: prototype for a fast OPA as front end for PHELIX/Penelope
Motivation: improvement of PHELIX performance, high temporal contrast front end for
Penelope, common front end technology development
Goal: > 1 mJ, temporally-clean laser pulses for the injection of PHELIX/Penelope
Design details:
Pump laser: 20-30 mJ short pulse (CPA), 515 nm, seeding
through the same oscillator, fiber stretcher, fiber pre-amplifier, pump laser
Yb:YAG regenerative amplifier, free-space compressor
Two-stage OPA based on BBO
Status:
First production unit in operation at PHELIX with low power
(10/2020)
Pump energy limited to 5 mJ (damage threshold) +
reliability tests
single OPA stage
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.2021High contrast front-end development at POLARIS (HI-Jena)
Highlights:
• High-contrast seed pulses for PEnELOPE
@ ATHENAh and POLARIS.
• 1st stage of double-stage CPA-system with
subsequent contrast enhancement (XPW).
• Design well-suited for joint future
development
• sub-80 fs, > 250 µJ, 1 Hz, TEM00-mode
• Aiming for high stability and reproducibility.
HZDR Deliverable
@ HI Jena
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U. Schramm, J. Osterhoff Status ATHENA, 7th MT Days, Online Meeting, 02.02.20211
• HI-Jena’s deliverable for ATHENAh operational, preparation for delivery 0,1 1 mJ, 150 fs
• delivery to HZDR in Q2/2021 0,01
Measured Temporal Contrast
• XPW to be tested 0,001
Intensity / a.u.
• Pre-pulse elimination, 1E-4
• Additional stretcher optics ordered & available 1E-5
• Optical simulation and optimization is done in parallel. 1E-6
Wedged optics
procured: will be
• Progress in optical frontend design 1E-7 installed.
• optimization of ps-pedestal / rising edge Surface Map of 1E-8
• ns-CPA understanding /optimization Improved Stretcher Optics:
1E-9
• reduced spectral phase aberrations 1E-10
• stability improvement -400 -300 -200 -100 0 100
Time / ps
Picosecond Compressor
P/V < l/30 (34 nm)
Rms < l/200 (4.9 nm)
Sa = 0.138 nm
Sq = 0.176 nm
Picosecond Stretcher
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