MOCOWBS02
KEK, Ibaraki, Japan
WEPNEC12
KEK, Ibaraki, Japan
WECOYBS06
KEK, Ibaraki, Japan
THCOZBS04
KEK, Ibaraki, Japan
| Paper | Title | Page |
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MOCOWBS02 |
Compact ERL (cERL), Stable 1 mA Operation with a Small Beam Emittance at KEK | |
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| The compact ERL (cERL) at KEK is a test accelerator to develop ERL technologies for high average beam current operation with high quality beam performance. The cERL consists of a photoinjector, a main linac for energy recovery, a recirculation loop and a beam dump. In order to achieve energy recovery operation with high average beam current, collimator tuning to reduce un-wanted beam loss was very important. After fine beam tuning and collimator tuning, we succeeded in CW operation with 0.9 mA average beam current, and it was very stable in two hours in June 2018. The emittances were measured in the injector and the recirculation loop by waist scan method, and they were close to the design emittance. In order to increase CW beam current to 10 mA, we are preparing the improvement of instrumentations. | ||
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Slides MOCOWBS02 [5.682 MB] | |
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WEPNEC12 |
Beam Optics of Bunch Compression at Compact ERL | |
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| Short electron bunch is essential for THz coherent transition radiation or FEL oscillation. Therefore, the bunch compression is studied at the compact ERL in KEK site. We demonstrated it and experimentally evaluated the bunch length and the transverse emittance. The results of the optics and beam commissioning will be presented. | ||
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WECOYBS06 |
Demonstration of THz Oscillation via Resonant Coherent Diffraction Radiation | |
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| ERL makes it possible to transport the short electron bunch with a high repetition frequency of 1.3 GHz. Coherent THz radiation from such short electron bunches is so intense as to be expected to utilize for many applications. We demonstrated the oscillation of the coherent diffraction radiation in the resonant optical cavity. In this presentation, we show recent progress. | ||
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Slides WECOYBS06 [2.695 MB] | |
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THCOZBS04 |
Injector Development at KEK | |
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| Since 2013, we have operated the compact ERL (cERL) injector at KEK to demonstrate hardware and beam performances for future ERL accelerator. The injector consists of a 500 kV DC photocathode gun, solenoid magnets, a normal conducting buncher and three 2-cell superconducting cavities. In beam operation, the DC gun with GaAS photocathode is very stable with DC 500 kV, and can generate stable CW 1 mA electron beam. For low bunch charge operation, we achieved designed beam performance with low emittance and short bunch length in the injector. From 2017, we started high bunch charge operation with 60 pC bunch charge toward an infrared free electron laser (IR FEL) test. In June 2019, we achieved the requirements of injector beam performance for the IR FEL test, which were < 3 mm mrad normalized emittance and 4 ps RMS bunch length. | ||
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Slides THCOZBS04 [4.475 MB] | |
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