1. 
   Stopband
   Vertical and horizontal tune values at which field errors can cause beam blow up in an accelerator. These stop bands have a definite width, so that the beam reaches resonance as the offending tune value is approached. Tevatron extraction is produced by widening the half-integer stop band.
   Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html
   
   
2. 
   Stopband
   A stopband is a band of frequencies, between specified limits, through which a circuit, such as a filter or telephone circuit, does not allow signals to pass, or the attenuation is above the required stopband attenuation level. Depending on application, the required attenuation within the stopband ...
   Found op http://en.wikipedia.org/wiki/Stopband
   
   
3. 
   Stopband
   Vertical and horizontal tune values at which field errors can cause beam blow up in an accelerator. These stop bands have a definite width, so that the beam reaches resonance as the offending tune value is approached. Tevatron extraction is produced by widening the half-integer stop band.
   Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
   
   
4. 
   stopband
   the primary region of reflection or absorption of a rejection filter.
   Found op http://www.chemistry-dictionary.com/definition/stopband.php
   
   

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