HAPEX III / PVDIS Targets Dave Meekins
Target List • Loops • LH2 25 cm • LD2 25 cm • 20 cm Spare • Solid target • Dummy tgts of correct length • Optics tgt Multi foil • BeO, Ta, C, H2O (warm only)
Loop Status • Motors • New motors have been assembled and tested. • Ready for installation. • Instrumentation • New temperature readouts. • Switching from Oxford ITC 502 to Lakeshore. • Higher channel density in smaller package.
25 cm Cell Status • CFR 851 required engineering complete waiting on review. • Review requires a test of cell. • “Improvements” have been made to the design. • Flow modeling is underway (ANSYS CFX) • 2 cells have been ordered • New vendor • Due mid month • Blocks have been ordered • Material has longer lead times and has caused delay • Remaining tasks prior to install • Complete fabrication of cells and blocks • Pressure test cells and complete pressure system safety requirements • Assemble loops
25 cm Cell All Ti Gr 5 hardware Al 7075 –T6 17 mm Gap
20 cm Cell • We have one cell in fair condition. • Making new one is possible but may not make schedule. • Cell blocks are not in best of shape. • Pressure test of these components is scheduled for end of next week. • After that test needs will be assessed.
Solid Targets • I have a list of requested targets from Oct 2008. • A new request for optics target has been made. • Need exact details quickly • Water cell will be installed for calibrations only • Pump status is not known • One solid target plus BeO is available. • Larger heat loads cannot be accommodated. • Suggest hole targets for alignment
Refrigeration • HAPEX III • 25 cm LH2 • Refrigeration supplied by ESR • 15K • Required flow will be high ~20 g/s • Operators must exercise sound judgment when operation JT valves. • PVDIS • 25 cm LD2 • Power requirement is 2 times higher • Refrigeration supplied by CHL max calc avail 14 g/s • We require about 14 g/s. • This is going to be touchy. • Extreme caution for JT ops is a must.
Summary • There is no room for mistakes in the machine process. • Plan on hand working the final beam entrance and exit windows • Installation will be complete on time if we do not have problems. • Refrigeration may become an issue for PVDIS • Final decisions are needed on solid targets ASAP.