Open AccessOperational evaluation of ultrahigh‐vacuum protection systems for intense‐photon‐flux wiggler beamlines
Author(s) -
Kanaya Noriichi,
Asaoka Seiji,
Sakanaka Shogo,
Maezawa Hideki
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049597015100
Subject(s) - wiggler , undulator , physics , beamline , synchrotron radiation , storage ring , klystron , advanced photon source , particle accelerator , photon , vacuum chamber , flux (metallurgy) , optics , synchrotron , nuclear physics , nuclear engineering , beam (structure) , electron , materials science , cathode ray , engineering , quantum mechanics , metallurgy
The ultrahigh‐vacuum (UHV) protection system at the 2.5 GeV synchrotron radiation source (positron storage ring) at the Photon Factory allows the intense‐photon‐flux wiggler beamlines to operate safely during synchrotron radiation experiments for a long time. There are six high‐power wiggler/undulator beamlines that provide intense photon‐flux beams to the experimental hall. In the case of a possible instantaneous vacuum failure at the experimental hall, the intense photon‐flux radiation from the wiggler could cause a meltdown of the titanium‐alloy fast‐closing valve. The authors have developed a UHV protection system. Upon a vacuum failure, the protection system can dump the positron beam by turning off the RF power in the four RF klystrons (150 kW maximum), and then initiate a blade closure of the fast‐closing valve. In this paper, the operational performance of the vacuum protection system for the intense‐photon‐flux wiggler beamlines is evaluated and discussed regarding the actual vacuum deterioration downstream of a beamline at the experimental hall.