Speaker
Description
The development of an easy and inexpensive Nb sheet preparation process, based on metallographic polishing has been presented earlier [1,2]. The aim is to remove the damage layer issued from the rolling process on the sheet in order to reduce the length of surface treatment on completed cavities. The process has been applied on a QPR sample and tested in RF, without any surface chemistry. Its surface resistance is about 4 times lower that the EP baseline at 414 MHz, 2 K [3]. The first elliptical cavity based on this principle has been produced at KEK, starting with large polished sheets developed in collaboration between IJCLAB, and the company LAMPLAN. We present its 1rst RF test at CEA, with a HF rinsing and a recrystallization treatment at 600 °C 10 h, without any chemical etching at first.
Footnotes
[1] C. Z. Antoine and R. Crooks, “Reducing Electropolishing Time with Chemical-Mechanical Polishing”, in Proc. SRF'09, Berlin, Germany, Sep. 2009, pp. 405-405.
[2] O. Hryhorenko et al., “An innovative approach of surface polishing for SRF cavity applications”, Journal of Manufacturing and Materials Processing, 2023. 7(2): p. 62.
[3] O. Hryhorenko et al., “Recent Advances in Metallographic Polishing for SRF Application”, in Proc. SRF'23, Grand Rapids, MI, USA, Jun. 2023, pp. 646-650.
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