LDX Project Status

LDX Project Status
August 28, 2001


The floating coil helium vessel was successfully completed after passing a full pressure, 1750 psi, vacuum leak check. The mold for construction of the fiberglass/lead composite radiation shield was completed, and the initial inner skin is currently being laid up.


MIT received the hard copy of the final Interface Control Document.

The Cable Institute in Moscow completed the manufacturing of the conductor for the C-coil. The SINTEZ representative examined and accepted the conductor. The final sequence of conductor lengths to be used during the coil winding was determined. A few (3 or 4) conductor lengths will be rewound onto separate bobbins to provide the necessary sequence for coil winding. It was also determined that this sequence requires some redesign of the position of the joints. All other drawings for coil and winding tool details have been given to the Efremov machine shop, and the custom tooling required for winding is under manufacture.

The tensioning device, brake, and electronic circuitry of the winding machine are being upgraded in preparation for C-coil winding. The tension of the conductor will be controlled automatically during winding and SINTEZ has determined the programming of the tension which will be applied so as not to over-compress the inner layers. The operation of the winding machine will be tested prior to the start of coil winding. C-coil winding is scheduled to begin on September 20.

Further tests of the dummy coil were completed to determine the modulus of elasticity of the impregnated coil. The strain-load curves confirmed the desired elastic deformation and the required quality of the epoxy impregnation (VPI). A model for the pre-loading of the coil clamping structure was tested at room temperature and in liquid nitrogen.

The quench protection and quench detection systems are under manufacturing and assembly.

SINTEZ has had difficulty finding a cryostat vendor who can manufacture the C-coil cryostat according to the required cost and schedule. Several perspective vendors rejected the manufacturing of the cryostat after consideration of the manufacturing drawings because of the complexity and the large number of tools that need to be designed and produced for a one-of-a-kind item. Three appropriate venders have been found.


This week, members of the LDX group meet with Dr. Peter Hwang of Everson Electric Company to discuss the design and manufacture of the L-coil winding and cryostat. During the meeting Peter presented examples of previous HTS coils that Everson had manufactured to help illustrate some of the winding techniques intended for the L-coil. Following Peter's suggestion and our review of the L-coil operating conditions, we decided to adopt a one-in-hand winding strategy for the L-coil. This change from two-in-hand to on-in-hand winding will simplify the winding operation and hopefully lead to a more reliable winding strategy.

A Cryomech AL230 cryocooler was selected for the L-coil cryostat and will be ordered shortly. We also finalized the HTS current leads for coil.

A preliminary instrumentation scheme has been agreed by both parties.


The springs that protect the bellows upper drive from hyperextension required modification and design revision that have been completed.
The supported mode lifting fixture final design has also been completed, and we are soliciting bids for its manufacture.


We employed a visiting student from France to map out the circuits and to prepare a manual for the 10 GHz system and assist with its reconditioning.


Improved physics models have been tested in our real-time levitation control computer. Mandrels for the external, equilibrium magnetic diagnostics have been fabricated.