- Profile monitor wiring harness checked by Bill Rawnsley using resistor pack --> OK
- New profile monitor (0.005" gold coated molybdenum wires) installed & blip tested --> OK
- Potentiometer checked --> OK
- Target position and profile monitor in/out micro-switches checked --> All OK
- Target leak checked: very small response at top and base of left side bellows (when facing target ladder), otherwise leak tight
(Meter on 10X scale, Baseline: 6. Meter reached 9 at top of bellows, 11 at bottom of bellows with 1s He application. Both recovered after ~30s)
- Straightened twisted bellows on both sides which was causing "clicking" noises during target ladder travel
(Note: water supply tube nylon swagelok ferrules should be replaced at next opportunity, currently no spare parts)
- Target leak checked again - No change due to bellows adjustment
- Static water pressure test performed, as target is likely water leak tight: Target filled with water, pressurized with air to 80psi, then valved off and left overnight. No visible water leak from bellows. Pressure dropped 11psi over 15 hours. Test was repeated, but the line valved off before the target to establish a baseline. The baseline test dropped 15psi over 16 hours. The increased leak is likely due to the additional valve added to the system, or different amounts of air in the system compared to total system volume. Baseline test shows that the pressure drop seen in first test appears to be due to a small leak in the test equipment, or expansion over time of the supply water hose. Concluded that target is water leak tight. Additionally, target assemblies have been installed in the beam line in the past with significantly higher helium leak rates, and no observed water leak, with no problems.
- All water pumped from target using liquid nitrogen trap
- Target ladder moved to position zero
- Target moved from hot cell to storage pit location #4. Ready for use in beam line. |