FMCG/Experimental setup

This part of the guide will assume the array and electronics rack have been completely removed from the magnetically shielded room (like after Ron & Co. have had a patient). In all that follows, “near side” of the bed will refer to the side closest to the door, and “far side” will be the other one, near the port where all the cables come in and out.

Moving into room

1. Wheel the electronics rack and tools cart into the room adjoining the MSR. The electronics rack should be placed along the desk right in front of the BTi computers, about 1m from the wall of the MSR. The tools cart can go pretty much anywhere there is room.
2. Take the magnetometer array from the tools cart and place it on the bed. The ports for the fibers and Cat5 cables should be on the far side of the bed. Channels 1 and 4 should be on the near side of the bed.
3. Return to the room and pass the bundles of Cat5 cables and fibers into the room. This part is most easily done with two people. Keep the blue guard on top of the fiber bundle to protect the clips. The bundle of fibers+grounding cable will sometimes fall into the gap between the walls of the MSR, so be careful if you're doing it by yourself.
4. Connect the bundles to the array. For the fibers,
   1. The fiber labeled 1 carries the pump light. It should be connected to the "Pump" input on the array.
   2. The fiber labeled 2 carries the probe light. It should be connected to the "Probe" input on the array.
   3. The black 18 ga wire is connected to ground outside of the room. This should be twisted to the shield (green wire) for the photodiode signals)
   4. The two other fiber ports (Probe Mon and Pump Mon) are not in use.
5. For the Cat5s,
   1. The dark blue cable with the H carries the heater signals. Plug this into the H port to the left of the fiber inputs.
   2. The dark blue cable with the P carries the photodiode signals. Plug this into the P port to the left of the fiber inputs.
   3. The four cables labeled 1, 2, 3, 4 (white, gray, yellow, white, respectively) carry the currents and thermistor readings. These can be plugged in to their respective inputs to the right of the fiber inputs.
6. Return to the adjoining room and connect up the room coils. They come through the port on gray twisted pairs, and have two labels, one for our group's axes and one for Ron's. Ours are blue. Connect these to the cat5 breakout box sitting on top of the probe TA temperature controller. This breakout box is connected to the 3-axis "Wyllie Supply" on the front of the rack. The field directions and connections are as follows:
   1. X: horizontal, long axis of the bed, connector 1 (top right).
   2. Y: vertical, connector 2 (bottom right).
   3. Z: horizontal, short axis of the bed connector 3 (bottom left).

Setting up computer and electronics

Do not turn the laptop on yet.

1. Attach the PCI card holder to the laptop and insert the PCI card all the way into the slot. Tighten the screws so the white pieces holds the card snugly.
2. Plug in the other 3 USB cables to the laptop.
   1. The white USB cable connects to the pump tapered amplifier controller.
   2. The black USB cable with the blue head is a GPIB-USB converter device that connects to the SRS LDC501 Laser Diode controllers (pump and probe).
   3. The black USB cable with the black head connects to the Arduino.
3. Plug in the three power strips (white cords on the bottom of the back of the rack) to the power strip on the floor. I tend to plug them all into the "switch controlled outputs", and then turn the switch on. All rack electronics will come alive after doing this.
4. While behind the rack, it's a good idea to turn on the pump TA temperature controller (black ThorLabs TEC 2000). The actual temperature is not as important: anywhere between 6 and 8 kOhm is fine.
5. Also turn on the high voltage supplies for the heaters. Those are the two Tektronix PWS2721 supplies in the bottom right corner. Hit the push button to turn them on, and the light-up ON/OFF to enable the output. If any of the heaters are enabled, you should see current being drawn from the supplies.
6. To enable the heaters, connect a function generator to the red BNC port on the front of the heater box, and set the correct parameters on the function generator. I've been using a 8V sine wave at 150.700 kHz (the small frequency offset takes care of low-frequency aliasing issues). Then flip up the ON/OFF switches on the channels you wish to heat up. The voltage can be adjusted on a per-channel basis by adjusting the gain pot on each channel. Again, you should see the current drawn from the Tektronix supplies change when you enable/disable/change the gain on each channel.
7. Make sure the heater fan is enabled. There is a small aluminum box with an on/off switch on top of the function generator. The cable is labeled Heater Fan. The fans have a distinctive whine when they're turned on, so it should be easy to tell that they're enabled. There is another similar looking box which provides +5 V for the LCD screen on the front of the main control box. Make sure this is enabled as well.
8. Return to the front side of the array and enable both of the lasers using the SRS LDC501s (left: pump, right: probe). TEC first, laser diode second. The devices have been set up to not allow laser output unless the TEC has been enabled first, anyway. Both lasers are fiber-coupled into their respective TAs, so by activating the diodes, you're not yet sending any light into the room.
9. Set up an oscilloscope. Use one of the long power cables connected to one of the rack power strips (bottom right on the back of the rack) to ensure that the scope shares a ground with the rest of the electronics. Connect a bundle of four BNC cables between the green BNC ports on the FPGA breakout box and the scope. The green BNC ports are in parallel with the FPGA inputs, and will provide a "monitor" for the data the FPGA can record. The switches beneath these ports determine the signal that is being sent to the FPGA and scope: The default position is down, which passes the detector signals via the DS345 I-V converters.
10. Power up the laptop. The username to use is BioMag and the password is biomag.
11. Attach the blue-headed VGA cable from the second monitor to the laptop. Hit the input selector button (far left) until the light under 1 is on. This monitor can be used for an extended desktop.

At this point, the setup is "ready to go". Optimization and data collection can begin as soon as the cells reach temperature. As long as the "current/thermistor" cat5 cables are plugged into the main box, the temperatures can be read by attaching a resistance meter to the green Temp BNC port and rotating the Channel Selector to the desired channel.