WG1002
HZDR, Dresden, Germany
HZB, Berlin, Germany
JLAB, Newport News, Virginia, USA
MBI, Berlin, Germany
WG5002
HZDR, Dresden, Germany
| Paper | Title | Page |
|---|---|---|
WG1002 |
The Superconducting RF Photo-Injector at ELBE | |
|
||
| A superconducting RF photo-injector (SRF gun) has been installed at the ELBE linac. It is the first SRF gun which is in operation at an accelerator up to now. The SRF gun consists of a 3' cell, 1.3 GHz superconducting cavity with normal conducting photocathode in it. At present, the gun delivers electron bunches with kinetic energies of 3 MeV in CW mode and up to 4 MeV in pulsed mode operation. The Cs2Te photo cathodes used in the gun exhibit a very long life time, e.g. a cathode was in use for more than one year and delivers a charge of 35 C. A degradation of the cavity performance due the normal conducting photo cathode was not found. The electron beam delivered to ELBE was used for beam transport optimization, longitudinal parameter and slice emittance measurements. The performance of the gun is mainly limited by the low gradient of the present cavity. For that reason two new and slightly modified cavities have been fabricated and tested at JLab. The results of the vertical tests are very promising. | ||
|
|
Slides WG1002 [7.423 MB] | |
WG5002 |
Beam Loss Monitoring and Machine Protection at the ELBE CW Accelerator | |
|
||
| The superconducting CW linac of the ELBE facility produces an electron beam up tu 40 MeV and 1 mA average current. The beam is used to drive two IR FELs and target stations for production of Bremsstrahlung, neutrons and positrons. An upgrade of the ELBE facility is ongoing which includes an increase of beam current as well as new experimental opportunities such as the production of broadband THz radiation and the interaction of electrons with high-power laser beams. The high beam power requires a fast and safe machine protection system. It was found that a continuous beam loss of about 10 μA or a total beam loss for longer than 2 ms produce damage. The beam loss at ELBE is monitored by two systems: beam loss monitors measuring the radiation in cable-like ionization chambers along the beamline, and beam current difference measurement system based on stripe line beam position monitors. | ||
|
|
Slides WG5002 [2.841 MB] | |