LTD3 Design2 m2

!
! =============================================

! Rick Spielman & Roman Shapovalov 2016-08-03
! =============================================

!

!

Time-step 0.1e-9

Resolution-time 1e-9

End-time 1.5e-6

Number-prints 5

Execute-cycles all

Grids no

Echo-setup no

Max-points 4001

!

!Start circuit definition

!

! We start with a capacitor and switch with the parameters based on the 
! 58 nF GA capacitor from report "Design and performance of 100 GW LTD".
! C brick = 29 nF, ESR brick = 0.26 .

! 

! Cavity Capacitance = 29 x 20 = 580 nF

! Cavity Cap ESR = 0.26/20 = 13 m

! Cavity switch resistance = 0.04/20 = 2 m

! Total cavity resistance = 0.3/20 = 15 m
!

! We will use a total inductance (demonstrated) of 160 nH for the brick.

! That includes the inductance of the feeds leading to the load and the

! inductance of the load.
!

!
! The charge voltage will be 100 kV X2. This is the projected normal operating

! point for LTD3.

!

! The cavity will have 20 brick and all of the parameters of the brick model are

! scaled by 20X.

!

!

BRANCH

!
! ===================================================

! Capacitor capacitance and charge voltage

!

  RCGround 1e+12 580e-9

  Initial  VC1   200e3

  UFO VC1

  $V_caps
!
! ===================================================

! Cap ESR and inductance 
!

  RLSeries 0.013 4.0e-9

!
! ===================================================

! Switch resistance and inductance
!

  RLSeries 0.002 4.0e-9

!
! ===================================================================

! Inductance of TL near central insulator. That connects  capacitors
! to the vacuum feed. We assume conservatively this TL is a disk.
!

  RLSeries 0.00 0.77e-9
  UFO VIN
  $V_DISK_IN
  UFO VOUT
  $V_DISK_OUT
!
! ===================================================================

! The parallel core loss

!

  RCG      1.9  1.0E-12

  UFO IR1

  $I_par

!
! ===================================================================

! Next we describe the vacuum feed line leading to x-pinch load. 
!
! Total feed inductance is 5.39 nH. We break the feed into parts and 
! look at voltages for purpose of electrical fields calculation. 
! We skip few points close to feed edges.
!
! ---------------------------
! Outer coax 1, point 1 
  RLSeries 0.00   0.08e-9
  UFO VOUT
  $V_COAX_P1 
!
! Outer coax 2, point 2
  RLSeries 0.00   0.06e-9
  UFO VOUT
  $V_COAX_P2
!
! Outer coax 3
  RLSeries 0.00   0.10e-9
!
! ---------------------------
! Tapered cone 1, point 3
  RLSeries 0.00   0.02e-9
  UFO VOUT
  $V_CONE_P3
!
! Tapered cone 2, point 4
  RLSeries 0.00   0.22e-9
  UFO VOUT
  $V_CONE_P4
!
! Tapered cone 3, point 5
  RLSeries 0.00   0.25e-9
  UFO VOUT
  $V_CONE_P5
!
! Tapered cone 4, point 6
  RLSeries 0.00   0.29e-9
  UFO VOUT_OUT
  $V_CONE_P6
!
! Tapered cone 5, point 7
  RLSeries 0.00   0.35e-9
  UFO VOUT
  $V_CONE_P7
!
! Tapered cone 6, point 8
  RLSeries 0.00   0.45e-9
  UFO VOUT
  $V_CONE_P8
!
! Tapered cone 7, point 9
  RLSeries 0.00   0.65e-9
  UFO VOUT
  $V_CONE_P9
!
! Tapered cone 8, point 10
  RLSeries 0.00   1.07e-9
  UFO VOUT
  $V_CONE_P10
!
! Tapered cone 0
  RLSeries 0.00   0.19e-9
!
! ---------------------------
! Inner coax 1, point 11
  RLSeries 0.00   0.54e-9
  UFO VOUT
  $V_COAX_P11
!
! Inner coax 2, point 12
  RLSeries 0.00   0.85e-9
  UFO VOUT
  $V_COAX_P12
!
! Inner coax 3
  RLSeries 0.00   0.24e-9
!
!
! ==============================================================================

! Load resistance and inductance.
!
! We model x pinch based on Cornell data (25-um Mo x pinch expanded to about 
! 120 um). X pinch is two such wires in parallel. We assume the wire resistivity
! is about 10 times less compared to initial cold state. 
! Hence, R = ~3 m and L = ~8.15 nH.
!

  RLSeries 0.00   8.15e-9
  UFO IR2

  $I_load

  UFO VIN

  $V_LOAD

  RCGround 0.003   0.0


!

! End circuit

!