Assuming the flip-coil measures integrated field strength (Database
                                 ----------
 "BACT" units, kG-m), the following relationships hold:

  BACT = Cb*E*KMOD*LEFF (kG-m)

   where

  Cb   = "magnetic rigidity" constant = 33.35640952 (kG-m/GeV)
  E    = energy (GeV)
  KMOD = Database KMOD value (bend angle (in radians) per unit length,
         1/m)
  LEFF = Database LEFF value (effective magnet length, m)



The dipole deflection is:

        delta theta (RAD) = 3e7 * dipolestrength(kG.m)
                            --------------------------
                                        ENERGY (eV)
                                                

         delta theta (RAD) =     dipolestrength (kG.m)
                             _________________________
                             Cb      *     ENERGY (GeV)
                                                             
About Quadrupoles:

        BACT is "length integrated transverse gradient" in units of
kG*m/m or just kG.

        BACT =       g (transverse gradient, kG/m) * leff (m)



        KMOD =     g ("transverse gradient")
                _____________________________
                        Brho    

                                where Brho is Cb*Energy

                        KMOD can be thought of as 1/focal length
                        per unit magnet length. Has units of 1/m^2

BDES->KMOD:
                KMOD =    g     =            BDES
                        ______     ______________________
                          Brho      leff*Cb*energy

KMOD->BDES:
                BDES = KMOD * (leff*Cb*Energy)


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Now the time honored technique to measure beta function at a quad by spinning
the quad strength and looking at dnu/dB:

Assimilating Sand's Chapter 2 about the guide field, I use EQ. 2.102 together
with the notions of KMOD, BACT for quad, and Cb above to convince myself that:

        Beta = 4*pi*Cb*Energy * ( dnu/dB)


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I recently struggled with the formulation of how to determine quad alignment
by looking at the slope of a downstream position monitor vs. quad strength.
Let's say we are interested in measuring the vertical offset in a 
quadrupole. Scan the quadrupole and sample the BACT and some BPM downstream.
Fit the result to a line (Y axis as vertical position monitor readout, X 
axis as quadrupole strength). The information is in the fitted slope.
Here's the formula:
                                             R34 is the RMATRIX value between
slope;   dY           R34*Yoffs              quad angle and BPM position.
         -----  =  --------------
	 dBACT       Energy * Cb             Yoffs is the beam position in
                                             the quad which we try to measure.

					     dY/dBACT we get from the fit 
					     described above.
BE CAREFUL ABOUT THE UNITS!
					     Energy is beam energy.

					     Cb is "magnetic rigidity" as per
					     above.

If you want the proof, you wrote it up 

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