R&D ERL: 5 Cell 704 MHz SRF Cavity Page: 4 of 8
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10. Final assembly and leak check of cavity
11. Testing in VTA to determine RF performance
12. Repeat steps 5-10 until desired performance is achieved.
13. If the desired performance is not reached via these steps implement new plan.
The cavity processing and testing had numerous hurdles to overcome as this was a unique cavity
to test, but in the end the cavity reached the desired gradient and Q. Figure 1 shows the Q vs
Eacc curve for the cavity at various stages in the processing cycle. The measured cavity
performance after low temperature baking as well as attachment of the helium vessel can be seen
in the graph.
Cavity Performance before and after 110 degree bake as well as after
He vessel welding
o 1.OOE 1O
if U A
* Before bake
A After Bake
Figure 1. The plot of Qo vs Eacc for three tests on the 5 cell cavity. The blue circles are before the 110 degree
bake, the red triangles are after the 110 degree bake and the pink squares are with the He vessel attached.
Following the VTA cavity testing the cavity string assembly began. This process was carried out
in the class 100 cleanroom at Jefferson Lab and included the installation of all of the beamline
components that are located between the isolation valves on either end of the string. Figure 2
shows the completed string assembly which is effectively symmetric about the 5 cell cavity. The
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Burrill, A. R&D ERL: 5 Cell 704 MHz SRF Cavity, report, January 1, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc830437/m1/4/: accessed February 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.