Tevatron Flying wire transverse emittance OAC


The OAC logs all of its devices in the Estats logger.  It logs data each time
the wires are flown and there is valid data (beam in the machine and valid
data from the front-end).  It also only logs data for wires which were flown,
i.e. if the E17 wire is not flown, it will not log emittances or data for
the E17 wire.

The OAC checks the FBI to see which bunches are present in the Tev.  Bunches
failing the check are assigned a value of -2.  Values computed by the OAC 
which would otherwise be reported as NaN are assigned a value of -1.


All arrays, except as noted,  are 37 elements with

    Element 0 = intensity weighted average of 36 bunches

                 (SUM(variable[i]*t:fbiXng[i]))/(SUM(t:fbiXng[i])); x=A,P

    Element 1-36 = bunch by bunch


1. Dp/P as calculated from the SBD statistical RMS and the
     Mike Church(MDC) Formulas
              ( need reference for MDC formulas)

  T:AMOMSP(37)  pbar    copy of dp/p from SBD (T:SBDAMS)
  T:PMOMSP(37)  p       copy of dp/p from SBD (T:SBDPMS)
  (The momentum spread devices are an exception to the rule of element 0 being the 
  intensity weighted mean.  Element 0 here is some type of mean calculated by the SBD, 
  but it is not calculated in the OAC.
  These are strictly a copy of the values used from the SBD by the OAC.)


2. Emittances using dp/p from the Mike Church (MDC) formulas

  T:AHEMIT(37)  pbar    horizontal  (E11) emittance
  T:PHEMIT(37)  p       horizontal  (E11) emittance
  T:AEEMIT(37)  pbar    horizontal  (E17) emittance
  T:PEEMIT(37)  p       horizontal  (E17) emittance
  T:AVEMIT(37)  pbar    vertical    (E11) emittance
  T:PVEMIT(37)  p       vertical    (E11) emittance


3. Horizontal Emittances using dp/p from the flying wires
           (Front end calculation)


  T:AHEMIF(37)  pbar    horizontal front end emittance
  T:PHEMIF(37)  p       horizontal front end emittance
  T:AVEMIT(37)  pbar    vertical    (E11) emittance
  T:PVEMIT(37)  p       vertical    (E11) emittance

   Note : Vertical front end emittances are the same as the MDC values

   Need to add FW dp/p for p and pbar


4. E11 Coupled Emittances as per Document 1465

  T:AHEMIC(37)  pbar    "horizontal" coupled emittance
  T:PHEMIC(37)  p       "horizontal" coupled emittance
  T:AVEMIC(37)  pbar    "vertical" coupled emittance
  T:PVEMIC(37)  p       "vertical" coupled emittance

5. FW Sigmas used in the calculations

  T:FWHASM(37)  Pbar    derived from FW E11 horiz sigmas T:FWHASG(72)
  T:FWVASM(37)  pbar    derived from FW E11 vert sigma   T:FWVASG(72)
  T:FWEASM(37)  pbar    derived from FW E17 horiz sigma  T:FWEASG(72)
  T:FWHPSM(37)  p       derived from FW E11 horiz sigma   T:FWHPSG(72)
  T:FWVPSM(37)  p       derived from FW E11 vert sigma   T:FWVPSG(72)
  T:FWEPSM(37)  p       derived from FW E17 horiz sigma  T;FWEPSG(72)

      Element 0 is the simple average of bunches 1-36
      Element 1-36 are the (pass1+pass2)/2

6. Copies of freshness numbers from front-end

  T:FWFROH	copy of E11H Freshness, T:FWE11H, from front-end
  T:FWFROv	copy of E11V Freshness, T:FWE11V, from front-end
  T:FWFROE	copy of E17H Freshness, T:FWE17H, from front-end

  T:FWFRSO	copy of general front-end freshness, T:FWFRSH

7. State Device for OAC which signals new data is ready (for SDA)

  V:TFWRDO	sets value of 3 to indicate new data 


7. Lattice functions used in calculations?