The SEE Control System allows the user to monitor and control **devices
under test** **(DUTs)** and beam parameters. Specifically, one may
perform the following operations remotely:

-Select and position DUTs (laser alignment is available)

-Monitor DUTs with real-time camera

-Position, calibrate, and monitor photomultiplier tubes (PMTs)

-Start and stop the beam

**[Accessing the SEE Software]{.underline}**

1\. To open the SEE Control System, click on the SEE icon located on the
desktop. The following window will appear:

![](media/image1.png){width="5.993055555555555in"
height="4.146527777777778in"}

Figure 1

2\. To run the SEE software, click on the white "**Run**" arrow in the
upper left-hand corner of the screen. If you wish to quit running the
SEE software, select "**File**" then "**Exit**".

**[Calibration of the PMTs]{.underline}**

Once the Control Room Operator has completed tuning the beam, the PMTs
will need to be calibrated prior to use. **These steps are normally
performed by the staff Beamline Specialist.**

1\. Ensure any parts loaded in to the test chamber are protected from
beam exposure by

closing gate valve GV4 from the vacuum control panel, closing the
shutter in the

diagnostics box, or simply removing the parts from the chamber.

2\. In the "**Beamline Status**" window, place the quad and center PMTs
in the beam (if

not already there) by clicking on the appropriate icons (see Figure 2):

Quad Center

![](media/image2.png){width="0.7916666666666666in" height="0.5in"}

Figure 2

3\. In the "**Ion/Device Setup**" window pane, select the appropriate
beam energy and ion.

4\. In the "**Test Status**" window pane, select the "**Turn HV On**"
button.

5\. Connect an oscilloscope to the center PMT remote output (labeled
"**C**" in the upper

left-hand corner of the shack test rack; quad PMTs are labeled by
number) and remove

attenuators until there are detectable flux levels in the "**Test
Status**" window.

**Caution: Do not adjust the flux levels above 5x10\^5.**

a\. With the vertical scale set to 100 mV/div and the horizontal scale
set to 0.05

usec/div, it should have a shape similar to Figure 3:

![](media/image3.jpeg){width="2.0in" height="1.4833333333333334in"}

Figure 3

b\. If the oscilloscope waveform does not look similar, remain calm.
Step 6 will adjust

the bias and threshold values, which will result in a waveform matching
Figure 3.

6\. In the "**Ion/Device Setup**" window pane, click the "**Set
HV/Threshold**" button to

bring up the following window (Figure 4):

![](media/image4.png){width="5.990972222222222in"
height="4.063194444444444in"}

Figure 4

a\. Adjust the center PMT bias voltage such that the first (negative)
pulse has an

amplitude of approximately 200mV. Some shortcuts:

1.) The "**Use Last Ion**" button inserts the bias and threshold
voltages from the last

ion viewed in the "**Set HV**" window.

2.) The "**Revert All Ion Settings**" returns the bias and threshold
voltages to the

values they were when the current "**Set HV**" was initially opened.

b\. Adjust the center PMT threshold voltage such that the flux
indication in the "**Test**

**Status**" window pane triggers off of the first negative pulse, but
does not increase

due to the secondary (noise) pulses. Typically, threshold voltages vary
between 40

to 120mV depending on the energy of the cocktail beam.

7\. Perform steps 5 and 6 for each of the quad PMTs, making sure to
connect the

oscilloscope to the corresponding PMT in step 5.

8\. Once the PMT voltages have been calibrated, "**Calibrated Flux**"
relationship to the

quad PMTs must be derived. This process will accurately estimate the
center PMT

flux reading using only the quad PMTs at the edge of the beam (since the
center PMT

will be removed from the beam path during testing).

a\. Select "**Setup**".

b\. Select "**Calibrate PMTs**". The "**Calibrated Flux**" value is now
derived from the

quad PMT fluxes.

9\. Calibrate the PMTs for the remaining ions:

a\. Have the Control Room Operator switch to the next ion. Make sure to
update the

ion you previously selected in the "**Ion/Device Setup**" window pane,
since

calibrated PMT voltages are stored in memory for *each ion*. The ion can
also be

selected from the "**Set HV/Threshold**" window.

b\. Repeat steps 6 through 9 until all five PMTs have been calibrated
for each ion.

c\. After all PMTs have been calibrated, remove the center PMT.

**[Device Setup]{.underline}**

1\. Ensure there are no objects obscuring the beam path between the
diagnostics box

(represented in the "**Beamline Status**" window pane) and the main
chamber. Both the

diagnostics box and the main chamber should be at vacuum, and gate valve
GV4

should be open.

**Note**: To ensure your DUT is not exposed to beam, either insert all
attenuators at the shack test rack or have the Control Room Operator
insert the beam stop.

2\. If energized, turn off the high voltage to the PMTs by clicking on
the red "**Turn HV**

**Off**" button.

3\. In the "**Beamline Status**" window pane, click on the laser mirror
block icon (Figure

5\) to move it in to the beam. Click on the shutter icon (Figure 5) to
flip it open.

Mirror Shutter

![](media/image5.png){width="0.7395833333333334in"
height="0.6666666666666666in"}

Figure 5

4\. Click on the "**Laser**" button below the camera screen to energize
the laser (the laser

icon may also be used). Verify that the laser is visible on the item to
be tested on the

camera screen. To increase visibility of the laser spot, the tank
(chamber) lights can

be turned on and off by pressing the "**Tank Lights**" button (or
clicking on the light

bulb icon).

5\. In the "**Table Motion**" window pane, use either the numerical
entry fields or the blue

arrows to position the laser at the center of the part to be tested. If
a Z offset value

was recorded, enter this value in the "**Z Offset**" field.

6\. In the "**Ion/Device Setup**" window pane, press the "**Add
Device**" button. When

prompted, name the device and press the "**OK**" button. The horizontal
and vertical

location of the DUT is now stored in memory (base and face positions are
not stored).

> a\. To delete a device, select it in the "**Devices**" list and press
> the "**Delete Device**"

button.

> b\. To return to a previously added DUT, select the device and press
> the "**Go To**
>
> **Device**" button.

**[Selecting Ions and Changing LET]{.underline}**

1\. In the "**Beamline Status**" window pane, close the shutter by
clicking its icon.

2\. Call the Control Room Operator at extension **5088** and request the
desired ion. The

ion will be tuned and full attenuation will be added. The Control Room
Operator will

call when the beam is ready for use.

3\. In the "**Ion/Device Setup**" window pane, press the "**Ion**"
button and select the

appropriate ion from the list. This will load the calibrated PMT
voltages for that ion.

4\. Use the attenuators on the shack test rack to adjust the flux to the
desired level.

Additional attenuating can be performed by the Control Room Operator.

**Caution: Do not adjust the flux levels above 1x10\^5 without pripr
approval.**

**Additional preparations are required by Cyclotron Staff to ensure the
PMTs are**

**properly protected.**

5\. The LET can be adjusted by either changing the base angle in the
"**Table Motion**"

window pane or setting and "**Effective LET**" value in the "**Test
Status**" window pane

(which automatically changes the table's base angle).

**[Running a Test]{.underline}**

After the DUT is loaded and positioned, the vacuum is ready, the
beamline is clear, the PMTs are calibrated, and the ion is selected, you
are ready to begin the run.

1\. In the "**Test**" window pane, select the "**Run Mode**":

> a\. "**Maximum Fluence**" -- Will automatically stop the run and close
> the shutter when
>
> the entered Maximum Fluence value is reached on the **Fluence**
> indicator.
>
> b\. "**Maximum Effective Fluence**" - Will automatically stop the run
> and close the
>
> shutter when the entered Maximum Effective Fluence value is reached on
> the
>
> **Eff. Fluence** indicator. Effective Fluence = Fluence x cos (Base
> Angle).
>
> c\. "**Run Up To Time**" - Will automatically stop the run and close
> the shutter when

the Run Up To Time value on the **Run Timer** is reached.

d\. **Manual** (Nothing Selected) -- Once running, the shutter will only
close when you

manually select the red "**Stop**" button (which is only visible when
running).

**Note:** The "**Run Up To Time**" can be used simultaneously with
either "**Maximum**

**Fluence**" or "**Maximum Effective Fluence**". The most limiting
condition will stop

the run first.

2\. The run number (below the "**Run**" button) will increment by one
once the "**Run**" is

pressed. To select a different run number, select the "**Run Number**"
tab at the upper

right of the screen and make the appropriate modification.

3\. Press the green "**Run**" button. The shutter will automatically
flip open and the timer

start.

4\. When the run is complete, the shutter will automatically close
(except in "**Manual**"

mode) and data collection will stop.

**[Run Data]{.underline}**

1\. When your run is finished, you can plug in a memory stick to the USB
port at the front

of the computer and copy the "**Event Log**" and "**Run Log**" files
located on the

desktop. These logs contain a detailed history of your run, and can be
easily imported

in to Excel (comma delimited).