LDX PROJECT STATUS

FEBRUARY, 2003

FLOATING COIL


The internal supports for the floating coil cryostat were installed at Ability Engineering with technical supervision by Darren Garnier and Rick Lations. This included precise sizing of 24 laminated supports and careful installation into the cryostat's internal support frame. The primary tasks remaining in cryostat assembly are the application of MLI superinsulation and completion of the final vacuum vessel welds.

(Fig. 1: Cut-away view of floating coil final fit-up with 24 supports
and four anti-rotation rods installed.)

CHARGING COIL

The charging coil is undergoing final leak tests prior to final cyrogenic and magnetic tests.

During the past month, all reflective films and shields have been attached to the inner facing vacuum cryostat surfaces. The nitrogen vessels and tubings were successfully leak tested. The final welds was made for pipings on the inside of the cryostat. The vacuum vessel inner and outer cylinders and the top cover were assembled and welded.

All vacuum, cryogenic, and magnetic tests are conducted at Sintez, and the coil was transported from the vacuum assembly shop. This required installation of the 12 transport supports, the same supports that will be use during shipment to MIT.

The nitrogen vessels and tubings were successfully leak tested. The vacuum vessel inner and outer cylinders and the top cover were assembled and welded. All 12 transport supports for helium vessel were installed to the cryostat top cover. The assembled cryostat was moved from the vacuum shop and the vacuum vessel welds were cleaned. The fully assembled cryostat was then moved by a trailer to the Sintez stand.

At the Sintez stand the transport supports will be removed, the hole sealed, and the cryostat will be pumped out for a leak test. Then the cryostat will be cooled first by liquid nitrogen, then by liquid helium, and finally tested.


(Fig. 2: Charging coil being readied for testing.)

LEVITATION COIL

Work on the L-coil cryostat assembly continues to go smoothly. This work included (1) attaching the conduction cooling links for the coil and leads to the lower end of the cold head, (2) thermal anchoring the gravity support rods, and (3) covering the access ports through the top radiation
shield. Temperature sensors were installed to the cold head and to the coil cooling ring to monitor the thermal performance of the coil system during operation. The upper lead radiation shields and final polish of the shield were also completed.

Completion of the multi-layer insulation system and close out of the cryostat vacuum shell is expected before the end of February.

(Fig. 3: Assembly of levitation coil nearing completion.)

LAUNCHER/CATCHER

The first tests of the launcher revealed a design problem with the bellows extension limiter system of the vacuum-facing interface. A redesign is being is being installed. Mechanical tests of the system can resume while the repairs are underway.

ECRH

Refurbishment of the second klystron (10.5 GC, 10 kW CW) to be used for plasma heating has begun.

DIAGNOSTICS

One video camera has been installed, the location of the magnetic sensors have been finalized after an optimization study, and the design for x-ray camera's vacuum interface is underway.