1. R. Messner May 2004 Readiness Review
LST Gas System
R. Messner
May 2004
Readiness Review

2. Will cover a few of the items below
Gas Mix – the issue of what gas mixtures will be allowed in the LST system has been resolved
FHA: O’Neill, Budnick
HEEC review
Gas Mixing System
In leak test
Want to test output flows ASAP
Integrate with the GIB
Gas Interrupt Box (GIB)
Finished with checkout
Had found problems with firmware; fixed
IR-2 Distribution Panels
Flow restrictor in hand, checked out
Gas Supply Manifolds
Next to be assembled
Gas Shack Safety System Expansion underway
Electrical
External Monitor System

3. Gas Mix Instead of getting a specific mix approved, we want approval for a region of mixes

4. Gas Mix The operating region takes into account the stability we have seen in the RPC system

5. Mixing System Functionality
A fourth mass flow meter can provide a tie-breaking vote in case of MFM/MFC disagreement
Can also pick up small drifts in mixed gas flows
Shut-off solenoids will close if the gas mix drifts out of the allowed region

6. Gas Rack - in leak test

7. Gas Rack

8. Gas Interrupt Box Functionality

9. GIB in checkout

10. Overview of the IR-2 Distribution

11. Silica tubing flow resistor

12. Check of silica tubing flow resistance

13. Gas Shack Layout Two new inert gas supplies;
Each will have a shutoff valve, orifice, overpressure releases
Construct a new isobutane supply rack and manifold;
Will have two isobutane shutoff valves, orifice

14. Summary
The loose ends involved in determining a permissible gas mix have been resolved
Very close to having a functional mixing system with its monitor system to ensure a non-flammable and a runnable mix
Use air or nitrogen, check the self consistency and stability of system
It is important to keep moving ahead; sufficient and timely technical support is critical
Want the gas rack in the gas shack before the end of May
Delayed a bit because we want to get the manifolds done first; then we can do more things in parallel
Expansion of Gas Shack safety system in progress
EPICs monitor system will be the next item to attack

15. Spare Slides

16. Looked at the recent performance of the RPC system
Snapshots taken a week apart, a half day at a time
This is a measure of the stability
of the gas mixture
out of 0.045
Or ~ 1.0 % of the reading

17. Recent performance of the RPC system
Isobutane Fraction in Gas Mixture