Kneisel, P.; Sekutowicz, J.; Klemz, G.; Nietubyc, R.; Kugeler, O.; Neumann, A.; Kamps, T.; Knobloch, J.: Fabrication, Treatment and Testing of a 1.6 cell Photoninjector cavity for HZB. In: Proceeding of 2011 Particle Accelerator Conference, March 28 - April 1, 1201. New York, NY, USA, 2011, p. 1047-1049
http://accelconf.web.cern.ch/accelconf/pac2011/papers/tup109.pdf
Abstract:
As an amendment to a CRADA (Cooperative Research and Development Agreement) between Forschungszentrum Dresden (FZD) and JLab we have fabricated and tested after appropriate surface treatment a 1.6 cell, 1300 MHz RRR nobium photo-injector cavity to be used in a demonstration test at HZB. Following a baseline test at JLab, the cavity received a lead spot coating of ~8 mm diameter deposited with a cothode arc at the Soltan Institute on the endplate made from large grain niobium. It had been demonstrated in earlier tests with a DESYbuilt 1.6 cell cavity - the original design - that a lead spot of this size can be a good electron source, when irradiated with a laser ligth of 213 mm. In the initial test with the lead spot we could measure a peak surface electric field of ~29 MV/m; after a second surface treatment, carried out to improve the cavity performance, but which was not done with sufficient precaution, the lead spot was destroyed and the cavity had to be coated a second time. This contribution reports about the expiriences and rsults obtained with this cavity.