Area Reset: An area is reset when it
has been searched, reset, and no interlocks are broken.
Auxiliary Equipment: Equipment
safety interlock for conditions such as temperature, water flow, or
vacuum.
Beam Stop: This is an element in the
beam-line which is used to stop the synchrotron radiation. It
consists of a water-cooled copper piece backed by a Tungsten block
to stop the white beam. All beam stops have redundant micro
switches to indicate their status (open or closed). They are
also failsafe, either by gravity or springs to close them in the
loss of power or air pressure.
Blue Key: The blue key is used to
bypass the CHESS East area interlock, to reset the CHESS East area
reset boxes, and to place CHESS East interlock in Bypass.
Cave: This is the shielded area
immediately downstream of the tunnel shielding wall on a beam line.
It is an accessible area when the beam stops for that line closed.
It has redundant micro switches on the door to indicate its status.
It may have labyrinths with doors that are either safety cabled or
with redundant micro switches.
Control Power: The -24 volt safety
power must be present for the safety to function. This is
usually the first element in the safety panel logic.
G-Area, East, or West Dump: Loss of
this logic signal drops all the shutters and beam stops in that
area. A dump is caused by loss of one of the following logic
signals: Area OK, Station Crash (dump buttons), area reset or
light interlock.
Key in Storage: A key is considered
in storage when it is in its appropriate location in a control panel
and activated.
Line Enable: A line enable is
obtained when;
(a) all the elements in the line that are
not water cooled are in the open position, and
(b) the vacuum is OK.
OK: an "OK" indication indicates
either a safe or secure condition.
Primary Gate Valve: This indicated
if the Primary gate valve for that beam line is open or not.
Red Key: the red key is used to
reset the CHESS West area reset boxes.
Safe: Safe means safe for people.
A station or line is considered safe if all the shutters and beam
stops are in the closed position. An area is considered safe
if all the beam lines are OK and if there are no radiation monitor
trips.
Safety Brick: A fixed element in the
beam line intended to stop the white beam.
Search: To verify that everyone has
evacuated a station or cave. Or for an area, to ensure
everyone has evacuated who does not have a bypass key.
Search Circuit: A circuit loaded in
each hutch and cave used to enable locking the door. It is to
be enabled only after the room has been thoroughly searched.
Secure: Secure means ready for
radiation. A station or cave is considered secure only after
the station is searched and all teh doors are closed and all the
keys are in storage. An area is considered secure when the
area has been searched, reset, and all keys are in storage.
Shutter: A non-cooled element used
to stop radiation from entering a station or cave. In white
beam applications it must be protected by a beam stop. All
shutters have redundant micro switches to indicate their logic
status of open or closed.
Station: A shielded area designed
for experiments which is accessible when the station beam stops
an/or shutters are closed. A station has a door with redundant
switches to indicate its status on the status panel. There may
also be labyrinth doors with redundant micro switches as well.
Station OK: A station is considered
OK if it is either safe or secure.
Station Crash: A dump button in a
station, cave, or on a control panel has been pushed. These
buttons are used for emergencies such as a person locked inside a
station cave.
White Key: A white key is a master
key which will work in place of any other color key. It is
used to bypass the CESR interlocks and to ensure the machine does
not turn on while in your possession. This is also known as a
machine key.
White Reset: A white key reset is
needed. This is normally done by the CESR Operator.
Yellow Key: A yellow key is used to
bypass the CHESS West area light interlock and to place CHESS West
interlock in bypass. The are must be safe while keys are in
use or CESR will dump. An operator on shift may place the area
in bypass and he/she is responsible for the area until he/she passes
the responsibility to the next shift or he/she secures the area.
