EDM Assembly and Commissioning – or – How to Cut Two Years from the Project

1. EDM Assembly and Commissioning – or – How to Cut Two Years from the Project P. Huffman and V. Cianciolo

2. Quick Answer • Decouple installation of the shields from installation of the cryostat in the FNPB. • Previously assumed that bottom of shields needed to be installed prior to cryostat. • If they can be slid under the cryostat along the beam axis then the shields can be made and tested in parallel with cryostat commissioning. • Cut off the project after the last subsystem (3He) is installed in the cryostat. • Pushes a significant amount of commissioning onto operations. • Requires modification of the CD4 requirements since as previously constructed they required much of that commissioning to be complete. • In our schedule the shields and coil package is at CIT at CD-4. We need to develop crisp arguments why this is a good idea.

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5. Neutron lifetime of 300 sec, required polarization to be seen in SQUID w/ S/N=1 in 10 Hz BW. ?? 1 in 10^11 5 kV/cm for 1 cycle (?) minimum required to have an interesting measurement. 4 pe/MeV for an alpha source - Minimum required to have an interesting measurement. 100 µφ/sqrt(Hz) S/N =1 w/ 10 Hz BW Demonstrate that central detector volume cools to 500 mK. Operated with coil package in place. <dB/dx>/B0 < 10-5/cm over fiducial volume: required to make interesting measurement. Shielding factor 10-4: minimum spec Flux out/mW = ##/cm^2/MW @ 8.9 A, 0.1n/cc minimum spec Polarization = 70%

7. Is this “too many” CD4 Requirements? • For FNPB we had 18. • I wanted to emphasize the value of ensuring that these are achievable…

9. Why are the Shields/Coils at CIT when we Reach CD4? And is this OK? • When we reach CD4 the shields will be fully tested w/o the cryostat. • We may want to install the shields around a mock-up of the cryostat to ensure mechanical compatibility. • Are there other major problems we could miss by not testing the shields and cryostat together? • If we keep them at CIT we could perform additional measurements on the coil package. Necessary? Desired? • If we move them to ORNL they will need to a) stay in boxes, b) be installed some place other than their final location, or c) installed in their final location. • No obvious benefit accrues from this option. • No obvious benefit accrues from this option and there is an increased risk of damaging the shields. • This option has some benefits, but will extend the project and increases the risk of damaging the shields.

10. What Do We Save? • $701k Assembly + Commissioning • $591k Project Office • Only ballpark – needs to have correct contingencies, inflation, etc. applied. • Technicians may cost more: • 7 NCSU tech years on revised project. • NCSU: $110k/yr • ORNL: $215k/year • Three options (require Martin, Geoff, Glenn, Gene, Jehanne, Chris, etc. to negotiate) • Techs all at ORNL • Lose $735k of $1292k savings • Make 1 tech NCSU, stationed at ORNL. • Lose $368k of $1292k savings. • Make 1 tech NCSU, stationed at ORNL, have ½ a tech paid by FNPB operations (i.e., free), ½ a tech at ORNL rates. • Save an additional $8k