Fringe fields broken in develop

[Laurie Nevay]

I originally thought this was just with the bdsimone integrator set as that's where it showed up in testing, but it's in all sets.

Particles get stuck in rbend fringe fields when using the bdsimone integrator set.

I know we don't use bdsimone so much now, but all other elements work with this integrator set.

examples/features/fields/integrators/bdsimone.gmad

--verbose_g4stepping=2

87    -25      -2.72e-10 5.4e+03  4.41e+04  0        2e-06    5.4e+03   sb1_even_ang_4_pv CoupledTransportation
88    -25      -2.72e-10 5.4e+03  4.41e+04  0        5e-07    5.4e+03   World       CoupledTransportation
89    -25      -2.72e-10 5.4e+03  4.41e+04  0        3e-06    5.4e+03   d1_mod_0_0_pv CoupledTransportation
90    -25      -2.72e-10 5.4e+03  4.41e+04  0        2e-06    5.4e+03   d1_mod_0_vacuum_pv CoupledTransportation
91    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        400      5.8e+03   d1_mod_0_0_pv CoupledTransportation
92    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        2e-06    5.8e+03   World       CoupledTransportation
93    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        3.5e-06  5.8e+03   rb1_e1_fringe_0_pv CoupledTransportation
94    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   World       CoupledTransportation
95    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        1.58e-12 5.8e+03   rb1_e1_fringe_0_pv CoupledTransportation
96    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   World       CoupledTransportation
97    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   rb1_e1_fringe_0_pv CoupledTransportation
98    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   World       CoupledTransportation
99    -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   rb1_e1_fringe_0_pv CoupledTransportation
100   -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   World       CoupledTransportation
101   -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   rb1_e1_fringe_0_pv CoupledTransportation
102   -64.9    -2.72e-10 5.8e+03  4.41e+04  0        0        5.8e+03   World       CoupledTransportation
103   -64.9    -2.72e-10 5.8e+03  4.41e+04  0        1e-07    5.8e+03   rb1_e1_fringe_0_pv CoupledTransportation

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomField1001
      issued by : G4MagInt_Driver::AccurateAdvance()
Proposed step is zero; hstep = 0 !
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------


-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomField1001
      issued by : G4MagInt_Driver::AccurateAdvance()
Proposed step is zero; hstep = 0 !
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------


-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomField1001
      issued by : G4MagInt_Driver::AccurateAdvance()
Proposed step is zero; hstep = 0 !
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

[Laurie Nevay]

I originally thought this was just with the bdsimone integrator set as that's where it showed up in testing, but it's in all sets.

[Laurie Nevay]

This has been fixed in develop and the code is now in a branch. Closing the issue as long solved.