Hall D Target Design Status Jim Fochtman- February 22, 2012.

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Presentation transcript:

Hall D Target Design Status Jim Fochtman- February 22, 2012

Quick Notes The refrigeration system has arrived! Hardware design about 90% complete. Detailing of some components has begun. Some questions about instrumentation and assembly.

Current concept to align/position the target is to adjust the entire can.

Any location preference for the gas and instrument connections?

Current Concept- With cold head can and branch connections fabricated… Insert the condenser, conductor and shield assembly through large port. Insert cover with cold head and vertical shield into can. Make gas, thermal and instrumentation connections. Attach the target and conductor assembly and then install the scattering chamber assembly.

First 18” of gas tube thermally connected to the shield (stage 1 of the cold head) to pre cool gas.

Condenser, conductor and shield assembly (target end). Target and conductor assembly installed and with the scattering chamber assembly.

Lakeshore Cernox CC package potted into VCR gland allows for removal and calibration. End of Swagelock VCR fitting brazed into condenser back plate.

This sensor will feed through the condenser deep into the top feed tube. This sensor used to detect top level (should not be submerged). This sensor used to detect top level (should be submerged). Initial fill detection Backup?

Cool Down Calculations CryoMech only had cool down data from room temperature from the PT-410 cold head, not the PT-415 we have. The graph shown here is the only information I received from CryoMech.

Cool Down Calculations- Method Used Excel to match the graphs points. The first stage power is nearly independent of the second stage temperature. The second stage power, is very dependant on the first stage temperature. Plotted into graph and line fit appropriate curves, and used fit lines to have a Power formula for cool down calculations.

Cool Down Calculations- Method Used data from NIST and to be conservative selected RRR 50 copper (lowest conductivity) for conductivity and specific heat. GASPAK ver Excel Add-In used for H 2 properties.

Cool Down Calculations- Method Condensation rate was calculated using the formula Whereis modified based on the Jakob number. The effective power of the stage 2 cold head at the condenser is ~10W. This should condense the 0.4 liter target/condenser in about 30 minutes. The system cool down considered a heat load of… 2W on Stage 1(~1.2W radiation, 0.5W spiders, 0.3W gas tube) from individual calculation 300mW on Stage 2 (200mW radiation target, 5mW radiation on shielded portion, 75mW spiders) Values based on individual calculations including MLI.

Cool Down Calculations- Method Assumptions – Used PT-410 Power (PT-415 power should be 1.2 & 1.4 times for stage 1 & 2 respectively) – Used 31g (0.4l of H 2 liquid) as mass from room temperature and condensation – Fixed pressure (131.4kPa/1.3atm) used in GASPAK for H 2 specific heat – Added fixed mass to compensate for CryoMech spec of first stage to 4K in less than 1 hour. Added appropriate mass for current design to stage 1 & 2 – Used linear interpolation between power bands and for heat loss from room temperature to cold – Solved for T2 using equation

Cool Down Calculations- Results Top graph uses stage 2 to cool the H 2 gas while the bottom graph shows the gas being cooled by stage 1 Using stage 1 to cool the gas is slightly faster, and is the design direction With a small target, the difference between which stage cools the gas is small, the results would be more significant with a larger liquid volume

Cool Down Calculations- Results Top graph uses stage 2 to cool the H 2 gas while the bottom graph shows the gas being cooled by stage 1 Both graphs show effective (90% of raw power – heat loss)

Back-Up Slides

Close up of target assembly. What grade Torlon?

Glue Joints

Cross section of condenser and target assembly. Fins of inside condenser show desired liquid level. Two 1”x5.5” polyimide heaters capable of ~20 W each. Redundancy. Attachment to tube?