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Photocathode Physics for Photoinjectors Workshop

12–14 Oct 2010
Brookhaven National Laboratory
US/Eastern timezone

Contribution List

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0. Requirements for Photocathodes for Photoinjectors
David Dowell (SLAC)
12/10/2010, 08:40
30 min. talk/10 min. questions Extensive overview of requirements of the photocathodes, including specific requirements for pulsed FEL and high current ERL photoinjectors.
1. Updates From Facilities: ANL, BNL, Cornell, JLAB, LBNL, European Labs, Japanese Labs
Triveni Rao (BNL)
12/10/2010, 09:20
10 min. kicks off the discussion to follow. State what photocathodes are being worked on and for what application, existing equipment and capabilities. Each site to contribute 2 to 3 slides to the conveners.
2. Discussion
12/10/2010, 09:30
Discussion charge: Update the table of requirements: pulsed versus high average current applications; table of available photocathode materials/labs with appropriate expertise; laboratory capabilities and techniques for photocathode characterization (including what's being planned and what's missing but would be nice to have).
5. Alphabet Soup - An Overview of Materials Techniques
John Smedley (BNL)
12/10/2010, 11:30
15 min. talk
6. Cathode Recipes
Theodore Vecchione (LBL)
12/10/2010, 11:45
15 min. talk
8. In-Situ Diffraction
Jean Jordan-Sweet (IBM)
12/10/2010, 12:00
20 min. talk/10 min. questions
4. Applications of Laser and Synchrotron Based ARPES to Photocathode Research
Jon Rameau (BNL)
12/10/2010, 13:30
20 min. talk/10 min. questions
3. Thermal Emittance; Response Time; Lifetime Measurements
Luca Cultrera (Cornell Univ.)
12/10/2010, 14:00
20 min. talk/10 min. questions Overview of techniques, methods, limitations, etc. E.g. why some copper photocathode measurements report an emittance about x2 theory, while others basically agree with theory. Does this illuminate some error in thermal measurement?
7. In-Situ Quick Exafs
Klaus Attenkofer (ANL)
12/10/2010, 14:30
20 min. talk/10 min. questions
9. Discussion
12/10/2010, 15:00
10. MBE, ALD and XPS
Scott Chambers (PNNL)
12/10/2010, 15:45
30 min. talk/15 min. questions
11. Discussion
12/10/2010, 16:30
Discussion charge: Proper measurement techniques of parameters relevant to accelerators; produce a list of measurement techniques that we can all agree on. Surface equipment/techniques available and desired for (to take most time). Photocathode growth and characterization. XPS, XRD, Topography, LEEM/PEEM, LEED/EBSD, SIMS, etc.--their application for understanding the structure and chemical...
12. Modeling of Photoemission
Kevin Jensen (NRL)
13/10/2010, 08:30
40 min. talk/5 min. questions To cover metals, antimonides, tellurides, NEA.
13. Physics of Semiconductor NEA Photocathodes
Charles Sinclair (Cornell Univ.)
13/10/2010, 09:15
30 min. talk/5 min. questions
15. Photoemission Emittance
John Schmerge (SLAC)
13/10/2010, 09:50
30 min. talk/5 min. questions
16. Discussion
13/10/2010, 10:40
Discussion charge: Is 3 step Spicer model sufficient to explain practical photocathodes? If not, what are the limitations? pros/cons of each family--what knobs exist to tune the performance: QE vs. wavelength, better lifetime, faster response, lower thermal emittance; what physics parts are poorly understood and need a better theory effort; semiconductor properties needed for quantitative...
17. In-room Lunch
13/10/2010, 12:30
18. Multiscale 3D Simulations of Charge Gain, Transport, and Collection Efficiency in Diamond
Dimitre Dmitrov (Tech-X)
13/10/2010, 13:30
30 min. talk/10 min. questions
19. Superlattice photocathode development for low emittance
Dr Makoto Kuwahara (Nagoya Univ.), Prof. Masahiro Yamamoto (KEK)
13/10/2010, 14:10
30 min. talk/10 min. questions Model approaches and predictions, comparison with data, search for the optimal combination of thermal emittance and response time from NEA.
20. Hybrid Insulator/Semiconductor - Metals and CsBr Coatings
Juan Maldonado (SLAC)
13/10/2010, 14:50
30 min. talk/10 min. questions
21. Discussion
13/10/2010, 15:10
Discussion charge: What measurements are out there, what's missing; agreement of theory vs. existing measurements for a) QE vs. wavelength; b) thermal emittance; energy spectra; c) response time; identify (additional) conditions/requirements for controlled experiments for benchmarking with modeling.
31. Plasmonic Interactions in Metallic Nanostructures
Howard Padmore (LBL)
14/10/2010, 08:30
25 min. talk/5 min. questions
27. Multiphoton Emission
Pietro Musumeci (UCLA)
14/10/2010, 09:00
25 min. talk/5 min. questions MgF2 coated Cu Cathode for longer lifetime? Multiphoton photoemission from semiconductors? Anything else interesting from UCLA.
29. New Activation with K/Cs for Better Stability and Lifetime?
Steven Sun (SLAC)
14/10/2010, 09:30
25 min. talk/5 min. questions
30. Work Function Lowering and Ponderomotive E-Acceleration for Ultra Low Emittance Beams
Karoly Nemeth (ANL)
14/10/2010, 10:00
25 min. talk/5 min. questions
32. Discussion
14/10/2010, 10:45
Discussion charge: Manufacturer's/lab's capabilities with regards to new material growth; sharing resources for a) photocathode prep recipes; b) measurement equipment. User facilities for photocathode research (e.g. to measure thermal emittance/response time). Testing of materials in the actual photoguns. Discussion on the repository.
34. Adjourn
14/10/2010, 12:30
35. BNL Facilities Tours
14/10/2010, 14:00
33. Adjorn
22. Multiphoton Emission
20 min. talk/5 min. questions MgF2 coated Cu Cathode for longer limetime? Multiphoton photoemission from semiconductors? Anything else interesting from UCLA.
23. Multiphoton Emission
20 min. talk/5 min. questions MgF2 coated Cu Cathode for longer lifetime? Multiphoton photoemission from semiconductors? Anything else interesting from UCLA.
24. Multiphoton Emission
20 min. talk/5 min. questions MgF2 coated Cu Cathode for longer lifetime? Multiphoton photoemission from semiconductors? Anything else interesting from UCLA.
25. Multiphoton Emission
20 min. talk/5 min. questions MgF2 coated Cu Cathode for longer lifetime? Multiphoton photoemission from semiconductors? Anything else interesting from UCLA.
26. Prospects of New III-V Photoemissive Materials Including Ternary and Quantum Lattice
20 min. talk/5 min. questions Prospect for multilayers to achieve lower emittance and longer lifetime.

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