Hall C HMS/SHMS shutters

How to check the HMS shutter position

Use the beam-right hall camera (HCCAM03) to inspect the indicator light on the control box outside the HMS shield house door, as highlighted below. Zooming in on that view will allow you to determine if the "open" light is illuminated.

How to check the SHMS shutter position, method 1

Open the magnet controls (see How-to/Magnets for instructions), and the shutter status readback should appear in the SHMS summary, as shown below.

How to check the SHMS shutter position, method 2

Pan to the left on the SHMS Bubblers camera (HCCAM04) to focus on the mirror facing the SHMS vacuum window; the location of the mirror is highlighted in the first image below. By zooming in on the mirror, you should be able to see the bolts of the vacuum window, as shown in the second image below, or the shutter, as shown in the third image.