|On Target (September 1995)|
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From the Ashes
P hoenix. To the ancient Egyptians it was a 500 year-old bird that set itself on fire, only to rise renewed from the ashes. CEBAF's first full production crymodule, "Phoenix," has also traveled a path of rejuvenation and rebirth like its Egyptian namesake. The crymodule was created in 1989 from parts of two existing crymodules that were no longer usable.
After 5 years of operation, Phoenix is being tested in the Test Lab by the SRF group. Findings will be used to alter future crymodule designs for gains in efficiency and durability.
"Phoenix is going through a complete round of testing that will allow us to understand the effects of operation on the crymodule. We can then develop processing techniques that will lead to increased performance and higher levels of achievable accelerator energy," says Staff Engineer Joe Preble of the Accelerator Division. Preble who originally named Phoenix, oversaw the crymodules's fabrication and is now coordinating the test effort.
Tests include: Quality Factor checks, probe sensing calibrations, RF and Vacuum systems evaluation, and research into changes in cryogenic performance that have occurred in the course of repeated operations. In the future, each crymodule will be disassembled to its smallest component, reworked, reassembled, and returned to operation in the accelerator.
Evaluation and testing of the cryomodules will be conducted in the Test Lab. Preble says removal of the cryomodule from the accelerator ensures that the accelerator itself will not be damaged in the course of testing. In addition external testing of crymodules allow work to be conducted without interruption of accelerator operation.
The accelerator has a total of 42 and one fourth crymodules consisting of 40 in linear accelerator sections, and two and one fourth in the injector. Ultimately, CEBAF will have two spare crymodules in reserve to install in place of those removed for reworking.
Sept 1995 CEBAF News
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