Update on He3 Services design since the ORNL meeting L. Bartoszek BARTOSZEK ENGINEERING 2/14/09

Some He3 Accomplishments Converted the IV1 pressurizer from just a pressurizer to a combined pressurizer/heat exchanger Experimented with actuator mechanisms to decouple contraction motion from actuation motion Attempted to integrate continuously revising versions of the central detector We are still in CAD revision hell Attempted to integrate the new plastic injection cell Analyzed IV1 for stress due to internal pressure and updated the solid model to thicken parts that needed it Hired new cryogenic engineer from FNAL to help with heat leak calculations and design of connections Eliminated the V14 valve in favor of a plastic burst disk

Non-He3 Accomplishments (To explain the paucity of my He3 accomplishments) Created a drawing package for the vacuum vessel Sent out a request for budgetary estimates for the vacuum vessel Received 5 quotes up to now Still waiting for forging costs Created a drawing package for the heat shields Will send out estimate packages “soon” Low but constant background level of looking at overall design of everything for problems that will bite us in the future

Current issues Plumbing changes dramatically with each revision of the central detector volume It takes time to integrate new sub-system models Jan integrates the Unigraphics model, I try to integrate the Inventor model No progress yet on putting realistic coaxial valves in the injection can module No progress yet on thermal connections between .4K parts and mixing chamber No progress yet on connections between actuator shafts and valves Problem fitting valve between Injection cell and IV1

New design of the IV1 pressurizer to add heat exchanger capability

Port that allows. 4K He into the inside of the pressurizer bellows Port that allows .4K He into the inside of the pressurizer bellows. The previous version of the pressurizer had the inside of the pink bellows open to vacuum. The new green bellows is compressed when the pink one is extended and holds the heat exchange He in.

Details of the heat exchanger port

Section through pressurizer showing the new linkages to the actuator Section through pressurizer showing the new linkages to the actuator. I want to adapt this mechanism to the valves to eliminate bending moments on the valves, so I tried to get the actuation motion to be decoupled from the thermal contraction motion. This mechanism does not fully decouple these motions.

Another view looking straight at the section view on last slide

The valve between the Injection cell and IV1 Constraints: We need to put the injection cell and IV1 at the best place inside the cos theta magnet for field uniformity The cos theta magnet cannot be arbitrarily long These facts limit the distance between the injection cell and IV1 Jan invented a coaxial valve to keep the He3 on the axis of the magnet I have not been able to convert this valve design into a working valve geometry with an actuator that is short enough to fit in the space available The plastic cell re-design took away even more space

This is the old glass cell design This is the old glass cell design. The coaxial valve was an independently testable unit.

This is the new plastic injection cell design This is the new plastic injection cell design. The heat exchanger on the bottom of this cell eats into the space of the coaxial valve, and the valve seat is now a part of the injection cell. IV1 has also been moved down 1 inch from its previous location.

This shows the relationship between the valve and injection cell now This shows the relationship between the valve and injection cell now. The white transparent stuff is all part of the injection cell. Note that the valve piston and seat in this coaxial valve is fictitious, but it is illustrative of the space issue.

Implications The outlet valve for the injection cell is not an independently testable device in the current concept The valve tester would have to accommodate the injection cell I still don’t have enough room for a real actuator

Questions: Can I increase the separation between the injection cell and IV1? Can we think about increasing the length of the cos theta magnet to increase the length of the uniform field region? I thought the cos theta magnet was made short enough to allow the central detector to be removed without removing the injection can module Is this the real motivation? What if we remove this constraint?

Side view showing length of cos theta magnet

End view of the assembly -Coil package cannot be removed with the injection can in -Central detector could be removed as long as the plumbing at the bottom of the injection can is removed. -Is it reasonable to do removals of major parts leaving the injection can in? -The cos theta magnet could be longer.

Assembly of the injection snout still needs to be understood, but the plastic cell is now part of the injection module. Need to make sure this flange doesn’t hit when the can is inserted into the UC

Summary Still a ton to do I need to ask detailed questions to our cryo experts about thermal radiation shielding inside the actuator coaxial tubes. I know how to eliminate radiation inside the actuator tube I’m not sure how to eliminate thermal radiation in the coaxial space between the inner and outer actuator tubes Is calculating the thermal intercepts on the actuators preliminary design or final design?