Specifications for gas and vacuum systems for the ATF-II facility at BNL

1. Compressed laser gas fill stationPurpose: To fill CO2 laser volumes (3m3 and 0.8m3) to 10 atm pressure absolute with a mixture of laser grade gases He:CO2:N2=8.5:1:0.5. We mix gases inside each laser volume by filling individual gases one by one. Gas flow rate: 200 scf/min.Main gas manifold accommodates 6 ea 40-liter He cylinders, 2 ea CO2 cylinders, 2 ea N2 cylinders. He cylinders should have an automatic switchover function (3+3). Switching over when pressure inside a cylinder nearly equals pressure in the fill volume (low pressure side of regulator).Gas fill should stop upon reaching 10 atm pressure in amplifier by setting a regulator, or any automated means.Remote control of pressure valves on the gas manifold and on the laser side is desirable. Remote display of pressure inside a laser is also desirable to be incorporate into the operator’s control panel or screen.

2. Isotopic CO2 gas fill cabinet and recovery system.Lasers use a 50/50 mixture of regular CO2 (16O) and isotopic CO2 (18O).Isotopic CO2 will be fed to the same laser volumes by a separate line at flow rate 20 scf/min.In addition to gas filling hardware we are looking for additional possibilities:a) Quote on C18O2 gas in quantity sufficient for double fill of laser volumes.b) Quote on cryogenic CO2 recovery system. By circulating laser gas through this system, we

shall deplete the CO2 content <5% of the initial content, store the gas over extended period of time (preferably at room temperature), and release it back into a laser volume when needed. Gas circulation circuit and pump will be provided.

3. Gas distribution lines The lines should connect compressed gas manifolds with lasers. Type of a connecting flange will be provided. The length of lines can be estimated based on the facility diagram. The diameter of lines can be determined from the gas fill rate requirement. Lines should include valves for purging or vacuum pumping. Gas valves on the laser side should be included for a remotely controlled option of the system.

4. Vacuum pump cabinet and vacuum manifold Accommodating Edwards EPX 180N twin pump (see picture) connected to a local manifold with 3 ea vacuum valves. Remote control option is preferable.

5. Vacuum distribution lines Three main lines connect a vacuum cabinet with lasers, several segments of the laser optical transport line, and several experimental stations. Lines operate from 1 atm to 10 -4 mbar supporting pumping speed 30 cf/min. Remote control version for individually pumped volumes is preferable.