| 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. | |
| WEP33 | Realisation of a prototype superconducting CW cavity and cryomodule for energy recovery | 545 |
| | - P. A. McIntosh, R. Bate, C. D. Beard, M. Cordwell, D. M. Dykes, S. Pattalwar, J. Strachan, E. Wooldridge
STFC Daresbury Laboratory - S. Belomestnykh, M. Liepe, H. Padamsee
Cornell University - A. Buechner, F. Gabriel, P. Michel
FZR Rossendorf - T. Kimura, T. I. Smith
Stanford University - J. Byrd, J. N. Corlett, D. Li, S. Lidia
LBNL
| |
| | For Energy Recovery applications, the requirement for
high-Q accelerating structures, operating in CW mode, at
large beam currents, with precise phase & amplitude
stability and modest accelerating gradients are all
fundamental in achieving intense photon fluxes from the
synchronised FEL insertion devices. Both Daresbury
Laboratory and Cornell University are developing designs
for advanced Energy Recovery Linac (ERL) facilities
which require accelerating Linacs which meet such
demanding criteria. The specification for the main ERL
accelerator for both facilities dictates a modest
accelerating gradient of 20 MV/m, at a Qo of better than
10^10, with a Qext of up to 10^8. A collaborative R&D
program has been set-up to design and fabricate a 'proof-of-
principle' cryomodule (which is well underway) that
can be tested on ERLP at Daresbury and also on the
Cornell ERL injector. This paper details the new
cryomodule design, provides an insight to the design
solutions employed and reports on the present status of
the project. | |
| 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. | |