| Paper | Title | Page |
|---|
| TUP66 | Low Emittance Polarized Electron Source Based on Superconducting RF Gun | 293 |
| | - R. Xiang, D. Janssen, P. Michel, K. Moeller, F. Staufenbiel, J. Teichert
FZD
| |
| | Continuous effort has been paid in last decades for a
better polarized electron source for the high energy
physics experiments. The DC guns with GaAs type
photocathodes have been successfully operated in several
laboratories, but the beam emittance is regretfully very
poor. Although rf gun has been considered for the
generation of the polarized electron beams with low
emittance, the limit on vacuum is still an open question
for the currently designed RF guns. In this paper a new
proposal is reported: polarized SRF gun, i.e.
superconducting rf gun with polarized photocathode. The
polarized SRF gun would eliminate this vacuum barrier
because of its low working temperature. Some questions
including the cathode response time and the electron back
bombardment are discussed in some detail, and the beam
dynamics simulation gives positive forecast of the future
application of polarized SRF gun. | |
| WEP77 | Field reconstruction by passband frequency measurement at the Rossendorf SRF-gun cavity | 689 |
| | - A. Arnold, H. Buettig, D. Janssen, G. Staats, J. Teichert
FZD
| |
| | In this paper a method is presented that provides the
field profile of a closed superconducting cavity only by
measuring its passband frequencies with the applied RF
coupling probes. This opens the possibility to estimate
field deformations that are caused by the preload of the
cavity tuner and its tuning during operation.
The method was tested at the 3.5 cell Rossendorf SRF
gun cavity [1] and a comparison between the measured
and predicted field distribution demonstrates the accuracy
within a range of 2%. | |
| WEP81 | Tests of air cooled 1.3 GHz waveguide windows using a RF coupler test bench based on a resonant ring | 705 |
| | - H. Buettig, A. Arnold, A. Buechner, F. Gabriel, P. Michel, R. Schurig, G. Staats, J. Teichert, J. Voigtlander, A. Winter
Reserch Center Dresden-Rossendorf
| |
| | A new coupler test bench based on a resonant ring has
been built at ELBE in Dresden-Rossendorf to run window
as well as coupler tests with RF power up to 100 kW. The
ring is driven by a 10 kW klystron. This test bench
includes also liquid nitrogen cooling of the ceramic cold
window of the RF-coupler which allows testing under
almost real conditions. A special waveguide was designed
to match couplers with different antenna tips. In a first
step the waveguide window has been equipped with
additional air-cooling and tested.
The design of the test bench and the gained experience
with warm window tests at the resonant ring as far as it
could be collected within a short time of operation will be
reported. | |