= Fall 2018 Upgrade of 40m Vacuum System =

== Goals ==

|| The primary purpose of this vent is to simply replace the VME system with an Acromag system and verify that we are at the same operating state as we are at now (so the pump and gauge hardware is NOT upgraded for now). This amounts to implementing Python logic for the [[https://wiki-40m.ligo.caltech.edu/Vacuum_Interlocks?highlight=%28interlocks%29|INTERLOCKS]] and checking that they work. The zeroth level test can be done o the electronics bench, by just changing EPICS values for pressure indicators and seeing that the appropriate DAC/BIO channels are triggered. https://wiki-40m.ligo.caltech.edu/Vacuum_Interlocks?highlight=%28interlocks%29||

== Design Documents ==

Schematics of current and proposed signal flows. Includes a parts list for new hardware. [[attachment:40m_Vacuum_System_Signal_Flow.pdf]]

List of all vacuum EPICS channels. [[attachment:slow_channel_list.pdf]]

Physical channel assignments to the Acromag cards. [[attachment:AcromagChannelAssignment.pdf]]

== Options for later hardware upgrades ==

 *good web site of gauges + : https://confluence.slac.stanford.edu/pages/viewpage.action?pageId=178520731#Gauges/Controllers-ColdCathode

||'''Component'''||||'''Notes'''||||'''New/Replacement/Carryover'''||||'''Link to product info'''||
||e.g., Ethernet gauge||||x-end||||replacement||||https://products.inficon.com/en-us/nav-products/product/detail/vgc50x/||
||EthernetIP Gateway||||pumpspool||||option||||https://www.frederickscompany.com/wp-content/uploads/2018/06/mx_ag_eip_ds.pdf/||
||Ethernet-Serialport Adapter||||2 purchased||||for gauge test Acromag||||https://reviewfinch.com/p/ONETAK-TCP-IP-Ethernet-RJ45-to-Serial-RS232-RS485-RS422-Converter-Adapter-Adaptor/170160/||
||cold cathode gauges||||need 7||||no serial port||||http://www.instrutechinc.com/cold-cathode-vacuum-gauge-hornet/||
||cold cathode ||||option||||gauge with RS485||||https://thyracont-vacuum.com/products/smartline-vacuum-transducers/vsi-vacuum-transducer-cold-cathode/vsi1xd-vacuum-transducer/||
||cold cathode 971 & 972||||cc & or pirani||||with RS485||||https://www.mksinst.com/docs/ur/970selector.aspx/||
|| 972 & 925  |||| ccp & pirani |||| ethernetCAT_??? ||||  https://www.mksinst.com/docs/UR/970-DS.pdf||
 *http://www.galilmc.com/news/white-paper-ethernet-or-ethercat-motion-control-choosing-right-network-your-application
  
 [[attachment:MKS_Gauges_Quote.pdf]]
 * 10-30-2018SV I learned it today that Serial Port to Ethernet Conversion is not reliable so scrap this MKS quote. I did not find any gauges with Ethernet output. Now we have a clear direction. Reality today that gauges come with serial ports. The sites just upgraded to gauge BPG400 with serial ports. 
 *existing Cold Cathode gauges 423 & or 421 [[https://www.mksinst.com/docs/UR/943DS.pdf]]
 *existing Pirani gauges are 275 Convectron  [[https://www.mksinst.com/product/product.aspx?ProductID=1426]]
 *valve actuator relay  [[attachment:24V relay-Valve.pdf]] 

== References ==
 *[[http://www.ligo.caltech.edu/~ajw/40m/40mProcedures.doc|Old software design]]
 *[[https://dcc.ligo.org/DocDB/0015/D000338/000/D000338-00.pdf|Old wiring diagrams]]
 *[[https://wiki-40m.ligo.caltech.edu/Vacuum-Upgrade-2018?action=AttachFile&do=view&target=old_40m_procedures.pdf|Old vacuum procedures manual]]