Editing PMT and Electronics Setup (section)

==Gain Matching==
The power supply used in this project is the CAEN 4-channel Programmable Power Supply. 
The user should be aware that Channel 0 corresponds to Tube 1, Channel 1 to Tube 2, 
Channel 2 to Tube 3, and Channel 3 to Tube 4. To operate the power supply, the user 
must first select the desired channel. After selecting the channel, the user should 
turn the knob until the "VSET" option is displayed. Once "VSET" is selected, the 
voltage must be set to at least 1200V, as anything lower will cause the output to 
drop below the threshold.

The oscilloscope will display the PMT output for each tube. 
The user must set a trigger value on the oscilloscope. Once the trigger is set, it 
must not be changed, as altering it will invalidate all previously recorded measurements. 
Next, turn the dial labeled "Scale" until the PMT output is large enough to easily observe 
the mV value (for most of these, we used 200 mV). Record the mV value by measuring the wavelength using the tick marks on the monitor. 
For example, referring to Figure 2 below, the resulting PMT output is 2500 mV based on the tick marks.
[[File:LogicPulse2.png|center|frame|Figure 2]]

[[File:Figure_1.png|center|frame|Figure 3]]
This is determined by counting from the crest to the trough of the waveform. After that, continue increasing the voltage in increments of 100V. Create a graph to plot the voltages as shown in Figure 3 above.
The voltage (V) should be recorded on the x-axis, and the output voltage (mV) should be 
plotted on the y-axis. Continue this process until the input voltage reaches 2600V. 
The slope of the graph should begin to plateau at higher voltages (we observed this 
plateau between 800V and 1800V). Repeat this process for tubes 1, 2, and 3.