1. 7/17/2002R. Henning -- TRD Gas Slow Control1 TRD Gas System Slow Control at MIT- Cambridge AMS TRD Meeting, CERN, July 2002 U. Becker, B. Demirkoz, P. Fisher, R. Henning, B. Monreal.

2. 7/17/2002R. Henning -- TRD Gas Slow Control2 Overview Help Design and Build Control Systems for TRD Gas System Prototype and Flight Systems. 1.Prototype System oTested Mixing Program for Prototype Box S using USCM V02. 2.“Commercial Version” oTest Software and Electronic Prototypes (Roma) for Whole Gas System using USCM V03 3. Flight System

3. 7/17/2002R. Henning -- TRD Gas Slow Control3 TRD Gas System Overview TRD 300 Liters Manifolds Box C Box S CO 2 940 psia 17.6-20.4psia Mixing Vessel 200 psia Figure 1: Schematic Arrangement of the TRD gas system. All pressure are given at 25 o C. Xe 1550psia

4. 7/17/2002R. Henning -- TRD Gas Slow Control4 Prototype System (1) USCMV02 Box S Prototype RS-232 DOUT Currently Used in Closed System Test (B. Monreal) ADC Power Drivers

5. 7/17/2002R. Henning -- TRD Gas Slow Control5 Prototype System (2)

6. 7/17/2002R. Henning -- TRD Gas Slow Control6 Electronics for Commercial System 2 x USCMV03 EPP Koutsenko CAN Interface + Guido Board CAN LVDS UGBS UGBC, etc. (Roma) Commercial Gas Systems Under Construction Develop Flight Software Control Commercial Gas Systems Mixing Program

7. 7/17/2002R. Henning -- TRD Gas Slow Control7 Box S Electronic Simulator Roma

8. 7/17/2002R. Henning -- TRD Gas Slow Control8 JMDC Power Emergency Operations AMS/ISS Operator USCM Crate Electronics CAN LVDS Mixing Program -Simple Operations -Continuous Monitoring Gas System Flight System

9. 7/17/2002R. Henning -- TRD Gas Slow Control9 - Mixing Program On Ground and JMDC - Following Sequence: 1.Start with Known Mixture in D Vessel. Vent D if mixture unknown. 2.Fill required partial pressure of CO 2 3.Fill required partial pressure of Xe. 4.Vent to Box C when required. - Minimize ground communication -Gas Transfer Controlled by Time Valve is Open. -Timing of Valve operations performed by UGBS, not USCM! Mixing Operation

10. 7/17/2002R. Henning -- TRD Gas Slow Control10 We Appreciate the Help of: Volker Commichau Klaus Hangarter Clemens Camps Alexei Lebedev Vladimir Koutsenko

11. 7/17/2002R. Henning -- TRD Gas Slow Control11 Box S Signals and Power

12. 7/17/2002R. Henning -- TRD Gas Slow Control12 TTT Xe Bottle : 1550psia CO 2 Bottle 940psia V10a V1a V20a V3a V4b V4a V5 V3b V2a V20b F3a P1a V2b V1b P2b RV3-300psi V10bD Vessel (Mix) F1a O1a 60cc 30cc P1b T P2a 7 liters per day to Box C O1b F2a F3b F2b15cc 30cc VG1a VG1b F1b Figure 2: Box S Diagram RVG1b-1200psi RVG1a-2800psi CO 2 Xe Ground Equipment V17a V17b O2a O2b

13. 7/17/2002R. Henning -- TRD Gas Slow Control13 Box S Pinout

14. 7/17/2002R. Henning -- TRD Gas Slow Control14 TRD Segment n n =1 to 41 From Gas System To Gas System PMnB PMnA VMnAVMnBVMnCVMnD 430 cu. in (7 liters) OMnAOMnB Manifolds

15. 7/17/2002R. Henning -- TRD Gas Slow Control15 Monitor Tube CO 2 Analyzer P5 RV4 – 29psig P3 CP2CP1 V8BV8A RV5-200psig P4 To Manifold From Manifold Figure 3: Box C From Box S (From V4a) From Box S (From V4b) V18aV18b V6bV6a V9a V9b