Chandra R., Gerardo M., Kyle R. 

Today we demonstrated the operability of the iLIGO XBM MTP/QDP80 pump pair as connected via the newly installed signal cable.  This new cable is part of the upcoming pump upgrade and is not intended to be compatible with the existing iLIGO MTP/QDP80 pumps.  As such, temporary "pigtail" cable adapters had to be utilized.  Thus, this is a transitional pump-cable-pump configuration.  It will be used during the pump/vent cycles scheduled for October and we needed to test the setup ahead of time.  

We also temporarily moved the new, to-be-installed, Vertex Turbo Station into the LVEA in order to test if a 2nd, unique, pump-cable-pump combination would be useable in October.  In this configuration, the new Pfeiffer Turbo Station is connected to the iLIGO Edwards QDP80 pump via the new signal cable using unique cable adapters (these adapters differ from the above mentioned).  For this application, the QDP80 is STARTED/STOPPED locally at the QDP80 with the Pfeiffer Turbo Station only utilizing the QDP80 "PUMP RUNNING" signal during normal turbo operation.  The absence of this signal will prevent the Turbo Station's "SAFETY" valve from opening or, cause it to close had it been opened before the loss of signal.  Working in conjunction with foreline pressure setpoints this will provide the required "two layer protection" for unattended pumping in October.  

The Kobelco vent/purge supply was ran for a few hours without incident - again as preperation for October activites.  

The vent/purge supply was also ran at the X-mid.  Measured dew point was found to be -41C - Preparation for 10" gate valve replacement in October.