LDX November 2000
Helium Vessel and Cryostat

MIT provided Ability with updated drawings of penetrations into the helium vessel, piping between helium vessel and the cryostat shield, the shield heat exchanger and position of ports in the vacuum vessel.

Substantial progress has been made on the floating coil cryostat and charging station under construction at Ability Engineering Technology. The helium vessel machining has been completed with a final weight of 150 kg.The internal supports have been completed and fit to the interior of the helium vessel using the dummy coil form and are now being custom fit to the F-coil which has been received and inspected in Chicago. Also at Ability, the major portions of the charging station vacuum vessel have been received and will shortly be assembled.

Suppost structure within Inconel vessel Support and coil
Charging station cylinder

At MIT, two prototype bumper supports have been constructed and a mechanical testing fixture is currently under construction to make the final design selection.

Charging Coil

Alex Zhukovsky visited Efremov Institute (Russia) on the end of October to discuss the project progress. Efremov presented a modified design of the C-coil cryostat. Changes have been made according to Conference Call notes. The weight of the cryostat was reduced to about 7500 kg, which fulfilled the MIT limitation connected with crane capacity. Additional liquid nitrogen shields have been added which reduce the heat leak to the helium vessel and a the liquid helium consumption. The interface of the C-cryostat piping and fittings with the LDX facility were agreed upon. Some further changes in the cryostat design were agreed to as a result discussions.

The test conductor joints were displayed. Results were presented for the testing of joints in a magnetic field . The results were better than predicted. The conductor is presently under manufacturing at the Cable Institute (Moscow). The first 1500 m of cable will be ready at the in mid November and will be used to wind a model coil.

Levitation Coil

A revised conceptual design of the LDX L-coil was completed on October 19, 2000 and reported in LDX-MIT-JHSchultz-101800-01. The revised conceptual design reflects the use of a stainless steel cladded Bi-2223 (high Tc) conductor which will now be provided by American Superconductor (ASC). The
use of the cladded conductor is seen as a lower risk option vs. uncladded since the conductor must survive the handling and forming required during coil winding. The smaller conductor packing fraction required a smaller coil
ID and larger OD when compared with the earlier design. An outstanding issue is the identification of the maximum fault loads which must be sustained by the L-coil structure in the event of a loss-of-control event resulting in the upward motion of the F-coil. The next steps in the L-coil activity are to finalize the fault load(s) and then to draft specifications and statements of work for the fabrication of the magnet system and its cryostat. The estimated ship date for the conductor is December 30, 2000.


Procurement of the launcher/catcher components has begun and drawings are being sent to be reviewed by vendors. Quotes are expected to be coming in soon. Bob Ellis (PPPL) has agreed to be available to consult on any issues or problems that may arise in the procurement of the catcher/launcher.