Keeping Up: CHESS Bootstraps to 3rd Generation Performance & Inexpensive, Reliable Sealing of Large UHV Enclosures Utilizing a Progressively-Deformed Wire
- James Savino, Cornell University
Thursday, April 4, 2:30 PM - Special ASD Seminar
NSCL Lecture Hall
As new light sources with modern insertion devices and ultra-low emittance turn on around the globe, the number of novel SR experiments that can be done using a first-generation source driving bending magnets and wigglers is diminishing rapidly. The current fiscal climate has delayed full project approval for Cornellís Energy Recovery Linac, a 4th-generation light source with unparalleled brilliance and flexibility. To remain competitive in the interim, CHESS must upgrade to 3rd-generation light source performance. A comprehensive plan is described. Several variants of a new Cornell-designed tunable undulator and novel optical devices are also described. Challenges and ramifications are discussed from an engineering perspective.
Pressure levels approaching ring vacuum are necessary in large enclosures having large access ports on SR beam lines. Seals for such enclosures are typically complex, expensive, and often require special skill
in installation. A method is herein described where an ordinary aluminum wire and an ordinary flat-surfaced enclosure lid are fixtured with simple, removable jigging. The enclosure lid is then bolted on in a manner that causes a progressive deformation of the sealing wire. The method and fixturing result in reliable leak-free sealing of large enclosures, as performed by personnel with ordinary levels of mechanical skill. The method may be adaptable to existing enclosures, depending on the existing seal geometry. Design features enhancing the utility of such wire-seal joints are discussed.