BPM Button Optimization to Minimize Distortion Due to Trapped Mode Heating

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Description

The outer circumference of a BPM button and the inner circumference of the button housing comprise a transmission line. This transmission line typically presents an impedance of a few tens of ohms to the beam, and couples very weakly to the 50 ohm coaxial transmission line that comprises the signal path out of the button. The modes which are consequently excited and trapped often have quality factors of several hundred, permitting resonant excitation by the beam. The thermal distortion resulting from trapped mode heating is potentially problematic for achieving the high precision beam position measurements needed to provide the sub-micron ... continued below

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Cameron,P.; Blednyk, A.; Kosciuk, B.; Pinayev, I.; Ravindranath, I. & Singh, O May 4, 2009.

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The outer circumference of a BPM button and the inner circumference of the button housing comprise a transmission line. This transmission line typically presents an impedance of a few tens of ohms to the beam, and couples very weakly to the 50 ohm coaxial transmission line that comprises the signal path out of the button. The modes which are consequently excited and trapped often have quality factors of several hundred, permitting resonant excitation by the beam. The thermal distortion resulting from trapped mode heating is potentially problematic for achieving the high precision beam position measurements needed to provide the sub-micron beam position stability required by light source users. We present a button design that has been optimized via material selection and component geometry to minimize both the trapped mode heating and the resulting thermal distortion.

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  • PAC09; Vancouver, Canada; 20090504 through 20090508

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  • Report No.: BNL--90422-2009-CP
  • Grant Number: DE-AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 970511
  • Archival Resource Key: ark:/67531/metadc928178

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  • May 4, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 8:29 p.m.

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Cameron,P.; Blednyk, A.; Kosciuk, B.; Pinayev, I.; Ravindranath, I. & Singh, O. BPM Button Optimization to Minimize Distortion Due to Trapped Mode Heating, article, May 4, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc928178/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.