S800 Documentation

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===== Radiation safety in the S3 vault =====	
Before entering the vault, inform the operator in charge so that the beam is being stopped and the RadSafety wall plug and scintillator for S3 are inserted, otherwise the cyclotron's RF will trip as soon as the door to the vault is being opened  (please check also this [[https://intra.nscl.msu.edu/ccf/infoexperimenters/vaultaccess.php|link]]). 

The S3 vault has three levels (see picture below), the top level, the middle level, and the bottom level. The different levels and sections within these levels are locked off by rad safety chains. Whenever a chain is unlocked, the area behind it needs to be checked and secured. When going around to the buttons, check the vault for other people, especially those working in areas not directly visible from where you stand. 

{{:wiki:s3-from-bottom1.jpg?300|East side of S3 vault as seen from the bottom level.}}

==== Bottom level ====
On the bottom level, two buttons need to be pushed to secure the area. One is located in the north-east corner of the vault, behind the spectrograph (see left picture below). The second one is located under the stairs next to the elevator (see central picture below). The bottom level is locked off with the chain on the stairs on the middle level (see right picture below). All lights have to be turned off before closing the chain. 

{{:wiki:s3-vault-securebutton5.jpg?350|Secure button in the north-east corner of the bottom level of the S3 vault.}}
{{:wiki:s3-vault-securebutton4.jpg?250|Secure button under the stairs from the bottom level of the S3 vault, next to the elevator.}}
{{:wiki:s3-vault-securechain3.jpg?350|Secure chain separating the bottom and middle levels of the S3 vault.}}

==== Middle level ====
The middle level is separated into two areas: (1) the beam line section west of the intermediate [[Stations#Intermediate Plane station|image chamber]], leading to the S800 [[Stations#Object Station|object station]], and (2) the middle level of the spectrograph with the staircase. The button for area (1) can be found at the western-most end of the vault at the S800 object (see first picture from left to right), where the beam line enters the vault from the transfer hall. This section is locked off from the remaining part by a chain at the intermediate image chamber (see second picture from left to right). Make sure that the lights in this section are off before locking he chain. Area (2) has one button on the frame of the spectrograph, between the two big spectrograph dipoles on the east side of the structure (see third picture from left to right). This section is secured by closing the chain on the staircase to the top level (see fourth picture from left to right). 

{{:wiki:s3-vault-securebutton3.jpg?265|Secure button in the western-most end of the S3 vault.}}
{{:wiki:s3-vault-securechain2.jpg?250|Secure chain separating the middle level from the object area in the west-most side of the S3 vault.}}
{{:wiki:s3-vault-securebutton2.jpg?265|Secure button in the east side of the middle level, attached to the frame of the spectrograph,.}}
{{:wiki:s3-vault-securechain1.jpg?250|Secure chain separating the middle level from the top level of the S3 vault.}}



==== Top level ====
The top level has one rad safety button on the south-east side of the spectrograph (see left picture below). This level is secured by closing the vault door (see right picture below). 


{{:wiki:s3-vault-securebutton1.jpg?300|Secure button in the top level of the S3 vault.}}
{{:wiki:s3-entrance.jpg?400|Entrance of S3 vault in the East high bay.}}
S800 Documentation

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