fets h - ion source experiments and installation scott lawrie, dan faircloth, alan letchford,...
TRANSCRIPT
![Page 1: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/1.jpg)
FETS H- Ion Source Experiments and Installation
Scott Lawrie, Dan Faircloth, Alan Letchford,Christoph Gabor, Phil Wise, Mark Whitehead,
Trevor Wood, Mike Perkins, Mick Bates, Pete Savage, David Lee, Juergen Pozimski, Rafael Enparantza
![Page 2: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/2.jpg)
Front End Test Stand (FETS)
![Page 3: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/3.jpg)
Beam Parameter
ISIS Ion Source
FETS Ion Source
Total Energy 35 keV 65 keV
Current55 mA
(35 mA to LEBT)
60 – 70 mA
Rep. Rate 50 Hz 50 Hz
Pulse Length 200 μs 2 ms
Normalisedx emittance
0.9 π mm mRad 0.5 π mm mRad
Normalisedy emittance
0.8 π mm mRad 0.5 π mm mRad
![Page 4: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/4.jpg)
Main Modifications
• Post extraction acceleration gap
• Analysing dipole magnet
• Extraction electrodes
• Power supplies
![Page 5: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/5.jpg)
250µs Pulsed Extraction
Power Supply +
17kV-
90° Analysing Magnet
35 keV H- Beam
55 mmPost Extraction
Acceleration Gap
Platform Ground
Platform DC Power Supply
Laboratory Ground
-35 kV
+-
18 kV
Extraction system
ISIS Ion Source
![Page 6: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/6.jpg)
2ms Pulsed Extraction
Power Supply +
25kV-
90° Analysing Magnet
65 keV H- Beam
9mmPost Extraction
Acceleration Gap
Platform Ground
Platform DC Power Supply
Laboratory Ground
-65 kV
+-
40 kVExtraction
system
FETS Ion Source Proton Suppressor
![Page 7: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/7.jpg)
Post ExtractionAcceleration Gap
![Page 8: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/8.jpg)
ISIS LEBT Line
Ion sourcePost
Extraction Acceleration
Solenoid 1 Solenoid 2 Diagnostics Sol. 3
![Page 9: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/9.jpg)
FETS LEBT Line
Ion source
Post Extraction
Acceleration PLUS
Diagnostics
Solenoid 1 Solenoid 2 Diagnostics Sol. 3
![Page 10: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/10.jpg)
Steel mounting and pumping flange
Laser diagnosticsdipole apparatus
Electrode and mu-metal shielding assembly
Ion source, analysing dipole magnet and cold box
![Page 11: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/11.jpg)
Electrode Spacer Assembly
![Page 12: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/12.jpg)
Analysing Sector Magnet
![Page 13: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/13.jpg)
Reasons For Use of Dipole
• Analyse out co-extracted electrons
• Allow caesium to collect in cold box
• Modify beam from slit to round shape
• Weakly focus beam to LEBT entrance
• Convenient 90° loading geometry
![Page 14: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/14.jpg)
Field Stronger
Field Weaker
Field Stronger
Field Weaker
Axial Beam
Size
Angle Around Dipole
90°0°
Angle Around Dipole
Radial Beam
Size
90°0°
dR
dB
B
Rn
e
eMagnetic Field Index:
n > 1n = 1n < 1
![Page 15: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/15.jpg)
Predicted beam profiles
Measured beam profiles
n > 1 n = 1 n < 1
![Page 16: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/16.jpg)
Extraction Electrode Setup
![Page 17: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/17.jpg)
Beam Parameters Determined by Extraction
System:• Ion species (H-)
• Current needed for application (70 mA)
High current density at plasma apertureHigh extraction voltage:
• Low divergence angle (ε < 0.5 π mm mRad)
Concave plasma meniscusFocussing electrostatic lens geometrySpace charge compensationLow ion temperature
2
3
VI
![Page 18: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/18.jpg)
Standard ISIS Extraction Geometry
![Page 19: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/19.jpg)
Pierce-Style Extraction Geometry
![Page 20: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/20.jpg)
AlternativePierce-Style Geometry
![Page 21: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/21.jpg)
Overview of Experimental Work
![Page 22: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/22.jpg)
Norm. εh = 0.82 π mm mRad Norm. εv = 0.75 π mm mRad
ISIS Ion Source
46.6 mA
![Page 23: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/23.jpg)
Norm. εh > 0.69 π mm mRad Norm. εv > 0.45 π mm mRad
ISIS Ion SourceReduced
Post-Extraction Acceleration Gap
+
56.0 mA
![Page 24: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/24.jpg)
Norm. εh = 0.68 π mm mRad Norm. εv = 0.42 π mm mRad
ISIS Ion SourceReduced
Post-Extraction Acceleration Gap
+Improved Sector
Magnet Good Field Region
+
49.6 mA
![Page 25: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/25.jpg)
Norm. εh = 0.57 π mm mRad Norm. εh = 0.39 π mm mRad
ISIS Ion SourceImproved Sector
Magnet Good Field Region
+Reduced
Post-Extraction Acceleration Gap
+Pierce-Style Extraction Geometry
+
42.6 mA
![Page 26: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/26.jpg)
FETS Ion SourceInstallation Progress
![Page 27: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/27.jpg)
![Page 28: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/28.jpg)
![Page 29: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/29.jpg)
![Page 30: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/30.jpg)
![Page 31: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/31.jpg)
![Page 32: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/32.jpg)
![Page 33: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/33.jpg)
![Page 34: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/34.jpg)
![Page 35: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/35.jpg)
![Page 36: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/36.jpg)
![Page 37: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/37.jpg)
![Page 38: FETS H - Ion Source Experiments and Installation Scott Lawrie, Dan Faircloth, Alan Letchford, Christoph Gabor, Phil Wise, Mark Whitehead, Trevor Wood,](https://reader036.vdocuments.us/reader036/viewer/2022081516/56649ed95503460f94be7a7a/html5/thumbnails/38.jpg)
Questions?Ion Source Latest Status:
•Commissioning timing signals
•Mains operable on platform
•Platform 70 kV imminent
•Extract power ready
•Beam due very soon!