| Title |
Quantum Efficiency Improvement of Polarized Electron Source using Strain Compensated Super Lattice Photocathode |
| Authors |
- N. Yamamoto, M. Hosaka, A. Mano, T. Miyauchi, Y. Takashima, Y. Takeda
Nagoya University, Nagoya, Japan
- X.J. Jin, M. Yamamoto
KEK, Ibaraki, Japan
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| Abstract |
Polarized electron beam is essential for future electron-positron colliders and electron-ion colliders. Improving the quantum efficiency is an important subject to realize those proposed applications. Recently we have developed the strain compensated superlattice (SL) photocathode. In the strain compensated SLs, the equivalent compressive and tensile strains introduced in the well and barrier SL layers so that strain relaxation is effectively suppressed with increasing the SL layer thickness and high crystal quality can be expected. In this study, we fabricated the GaAs/GaAsP strain compensated SLs with the thickness up to 90-pair SL layers. Up to now, the electron spin polarization of 92 % and the quantum efficiency of 1.6 % were simultaneously achieved from 24-pair sample. In the presentation, we show the effect of the superlattice thickness on the photocathode performances and discuss the photocathode physics.
|
| Paper |
download WEAD3.PDF [0.132 MB / 3 pages] |
| Slides |
download WEAD3_TALK.PDF [3.064 MB] |
| Export |
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※ EndNote |
| Conference |
IPAC2015, Richmond, VA, USA |
| Series |
International Particle Accelerator Conference (6th) |
| Proceedings |
Link to full IPAC2015 Proccedings |
| Session |
Contributed Orals (MC3) |
| Date |
06-May-15 14:00–15:00 |
| Main Classification |
3: Alternative Particle Sources and Acceleration Techniques |
| Sub Classification |
T02 - Electron Sources |
| Keywords |
electron, laser, gun, polarization, collider |
| Publisher |
JACoW, Geneva, Switzerland |
| Editors |
Stuart Henderson (ANL, Argonne, IL, USA); Evelyn Akers (Jlab, Newport News, VA, USA); Todd Satogata (JLab, Newport News, VA, USA); Volker R.W. Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-168-7 |
| Published |
June 2015 |
| Copyright |
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