A google doc is available compiling digitizer channels and their assigned diagnostics.

Middle Room (L209)

Chronos Dt-Acq

Chronos is now located in the new, enclosed PCS rack closest to the test cell door. Chronos can be configured using a MATLAB GUI to program its analog and digital outputs and to reboot and reset it. Chronos' boot process has been modified to circumvent issues with failing/failed on-board RAM. The boot process now requires a script (/home/ltxuser/scripts/init_dtacq.sh) run on Lithos. A document listing customizations of the boot process can be found here (may be deprecated after move from Peabody to Lithos).

Analog Outputs

Chronos has a 32-output AO board, presently run at 10 kHz beginning at t = 0s. Currently, 6 outputs provide control signals to the equilibrium coil power supplies.

AO-01: Controls Robicon T1 and PEI, which drive the toroidal field coils.
AO-02: Controls Robicon T2, which drives the internal coils.
AO-03: Controls Robicon T3, which drives both the top and bottom orange coils.
AO-04: Controls Robicon T4, which drives the green coils.
AO-05: Controls Robicon DF, which drives the red coils.
AO-06: Controls Robicon IF, which drives the blue coils.

Digital Outputs

Chronos has 32 digital outputs. Presently only DO-02 is used to control the high-field side gas puff.

Analog Inputs

Chronos has 96 analog inputs run at 500 kHz beginning at t = 0.4s. Presently they are used for the filterscopes and will also be used for the

National Instruments

PXI 1042

Located in middle rack, L209B, controlled by Nibbler, main device is PXI 8101

PXI 6250_S3: Digitizes power supply requests
PXI 6723
PXI 6123

RTD PXIe 1071

Typically accessed by Remote Desktop from LTX-Hermes, main device is PXI 8821

PXI 4357s: RTD digitization, 20 channels
PXI ? Thermocouples for TF, outer center stack, 32? channels

TC CFP 2120

Left Rack L209A, Controlled by LTX-Zoidberg, controls shell, OH, and PF coil thermocouples, 64 channels

CAMAC

Controlled over GPIB by main Labview VI on Bender

Joergers

3 MHz, 6 channels each, 4 separate modules (with 128K - 512K memory) available in slots 1-4. Presently only 3 channels used for interferometer.

It has been found that the Joerger digitizers (or at least Jorger A/slot 2, channel 3) has peculiar input saturation behavior: when the input voltage rises above 5V, rather than saturating at 5V, the recorded data is saturated to 15V. Presumably, the same behavior is replicated in reversed polarity and on all channels of all Joergers, but this has not been verified as of **10/25/2018**.

Jorway J221s

J221s are 12-output 1 MHz timing modules. There are two J221s, J221_S22, J221_S19, in which at least one channel appears to be dead.

LC8212s (A,B,C)

Deprecated digitizers

PCS computer

Test Cell (L210/211)

Magnetics Rack

The magnetics rack ground derives from a green 12-gauge ground wire that runs from the rack side of the magnetics rack isolation transformer to the main ground bus. A local ground bus at the back of the magnetics rack is ground-referenced through the right-hand (from the front) power strip, and supplies a ground reference for the cable shields of the new toroidal array, shell eddy sensor array, and extensions to the re-entrant Mirnov array.

The magnetics rack is also home to five D-LTX 133 32-channel integrators.

Helios Dt-Acq

96 Analog inputs at 100 kHz starting at t = 0s

Neos Dt-Acq

96 Analog inputs at 100 kHz starting at t = 0s

(Thomson Rack?)

Caen v1720s

Polychromators

Probe PRB_PXI_1042

Controlled by LTX-Calculon, which is in the L209A (left) rack

PXI6143 slots 2-6: Digitizes NSTX Lanmguir probe box

OH Room (L212)

OH_PXI_8110

In L212B (right rack). Controlled by LTX-Nibbler. Actually PXI-1045 Chassis, 8110 is main card.

PXI5105_S3: Bank voltages and rogowski currents
PXI6133_S4, _S5: OH IGBT currenets

NBI Room (L111)=

LTX-Fry-NB7

PC w/ AdLink / NuDAQ boards

DAQ 2204 - 32-CH differential analog inputs
PCI 6208 - 8 CH analog outputs

Other Independently Digitized Signals

Various cameras

Digitizers

Contents