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Transcript of The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ...
![Page 1: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/1.jpg)
The PITZ Plasma Source
Matthias Gross
LAOLA Workshop
Wismar, 24. June 2015
WG1 – Plasma targets, diagnostics and plasma beam transport
![Page 2: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/2.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 2
Beam Line Remodeling
Electron
Beam
Plasma cell
Ionization laser
Dipole
Quad 1…4
Quad 5…6
Quad 7…8
![Page 3: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/3.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 3
Plasma Cell Design
Thermal
Insulation Cooling
Sleeve
Electron
Window
Helium
Distribution
Heating Coils
e-
Ionization
Laser Path Laser
Window
Design:
Gerald Koss
![Page 4: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/4.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 4
> ASTRA simulations: electron beam scattering impedes focusing into the
plasma
> Maximal agreeable scattering angle: 0.2 mrad
> 8m Kapton foil for first experiments expect 1 mrad
Scattering at Electron Window
Strongly defocused
0.4 mrad
Window position Middle of plasma cell
Focus still ok –
can be optimized
0.2 mrad
![Page 5: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/5.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 5
Pre-experiment #1: Screen station
> Purpose: Find quadrupole settings for best focusing
> Best result: <100m spot size (100 pC bunch charge; 22 MeV; no
scattering foil)
e-
Screen
Station
Camera
![Page 6: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/6.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 6
> Purpose: test of interaction electron beam electron window foils
Pre-experiment #2: Dummy Plasma Cell
e-
Electron
windows:
8m Kapton
Gas inlet
(1mbar Ar)
![Page 7: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/7.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 7
> Purpose: test of interaction electron beam electron window foils
> Capturing of tightly focused beam behind plasma cell (at that time only
2 Quads available for beam capturing)
Pre-experiment #2: Dummy Plasma Cell
![Page 8: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/8.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 8
Summary
> PITZ beamline was remodeled for plasma experiments
> Several preparatory experiments have been performed
1) Beam dynamics: <100m focusing into plasma cell was achieved
2) Electron beam – plasma cell interaction: 8m Kapton foil could be used for first
experiments
> Simulation shows strong scattering, but beam passed plasma cell intact
![Page 9: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/9.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 9
Backup
![Page 10: The PITZ Plasma Sourcepitz.desy.de/.../infoboxContent201847/Wismar_June2015_WG1_MGross.pdfThe PITZ Plasma Source Matthias Gross LAOLA Workshop Wismar, 24. June 2015 WG1 – Plasma](https://reader030.fdocuments.net/reader030/viewer/2022021501/5ad1cf1e7f8b9aff738c0952/html5/thumbnails/10.jpg)
Matthias Gross | LAOLA workshop | 24. June 2015 | Page 10
> Purpose: Find maximal allowable window foil thickness
> Result: 3m (to be checked: gas diffusion)
Pre-experiment #3: Electron Beam Scattering
0.1 1 10
0.01
0.1
1
10
Simulation (FLUKA)
Equation (Multiple Coulomb scattering)
Experiment in PITZ beam line
Div
erg
en
ce
(m
rad
)
Foil thickness (µm)
Goal: 0.2 mrad