| LDX Project Status
LDX Project Status
October 7, 2001
FLOATING COIL HELIUM VESSEL AND CRYOSTAT
Work on the LDX floating coil continues at Ability Engineering Technology in South Holland, Illinois. Currently, the composite lead shields are under construction. The inner skins of the two torus halves have been completed and layout is underway of the "meat" (i.e. lead tiles) of the composite sandwich. All lead tiles have been cut and weighed. The cooling tubes have been laid out with all brazed transitions completed, and leak checked. Soldering of thermal interconnect strips between the lead and copper cooling tubes are now underway.
All subcomponents of the unique laminated supports have been received and are now being cleaned for final assembly. A test assembly was made to verify the height and functionality of the supports which contain over 250 pie-pan shaped washers.
A picture of the f-coil shield showing the cooling coils is shown below.
We have reached an agreement with SINTEZ for the completion of the c-coil. A realistic schedule has been approved which will lead to delivery of the c-coil to MIT in July, 2002. We have agreed to increase the cost by $100K, up to a total cost of $410K. The contract for the construction of the cryostat has been given to the Efremov Shop (EFO plant) which should facilitate the timely manufacture of this large item.
The winding machine has been installed in a "clean" building with a newly painted floor. Five bobbins of conductor have been delivered to SINTEZ from the Moscow cable Institute. The remaining 6 bobbins will be delivered later. The winding tools have been manufactured, inspected, assembled and installed at the winding machine. The tensioner was calibrated during a trial winding.
The C-coil winding began on October 25 and 14 layers were finished by November 5. The winding rate is approximately 1.75 layers per day which extrapolates to an estimated completion date for the winding of December 4. The number of turns in a layer is observed to be between 172 and 176, depending on amount of space for the insulation of conductor. They are planning on making 50 layers (according to the ordered lengths of conductor, i.e. 8750 turns). An uninterrupted engineering quality control according to a protocol is being followed during the whole winding process.
The quench protection (QPS) and quench detection (QDS) systems are almost fully assembled in their boxes. The resistor for the QPS is being manufactured and will be ready in 1.5 month. The assembled QPS will be tested with an external resistor shortly. The final version of quench protection system document (including schematics) for the Final Design Document as well as the final version of the Interface Control Document have been received.
The cryostat manufacturing is in a technological preparation stage at the SINTEZ EFO Plant. The quantity of the main materials for the cryostat has been determined and the EFO plant is arranging to purchase them. Steel will be obtained outside of Russia (in Europe). A schedule will be made for each item and for each manufacturing tool.
A documentation for the VPI of the coil has been issued and agreed upon with the vendor plant where the VPI will be done. The necessary tools for VPI are under manufacturing.
Alex Zhukovsky will visit SINTEZ during the week of December 10. A picture of the coil as it is being wound is shown below.
A first set of preliminary design drawings for the L-coil were received from Everson Electric for our comments on Oct. 1. Several minor changes to the preliminary design were returned to Everson and updated drawing set is being prepared.
The major changes to the preliminary design include the substitution of a stainless steel winding mandrel with 8mm radial thickness for the proposed 1mm thick G-10 mandrel. A thicker winding mandrel is proposed to help protect against radial buckling of the inner turns of the winding due to stress accumulation during the winding of this 1300 turn coil. The thickness of the copper sheet that will be used for the pancake transition joint at the I.D. of the winding has been slightly increased to reduce the total resistance of this joint. The configuration of the cooling fins to conduction-cool the winding has been slightly modified to simplify manufacture and improve reliability of the thermal interconnection between the cooling fins on the top and bottom of the coil's support plate. The radial eddy current breaks in the copper cooling ring at the I.D. of the coil and in the copper cooling fins have been slightly offset from the first version to improve the mechanical connection between the winding and cryostat and to reduce the possibility that the support arms might unintentionally bridge the eddy current breaks in the cooling links. The use of impregnatible Nomex insulation as a substitute for the proposed Nomex/glass insulation scheme is under investigation, as is the final specification of the winding tension levels to use for different radial sections of the coil.
We are in the process of getting bids for the lifting fixture. A right-angle box is here at MIT, one of the drives is ready to ship, pending the correct paperwork, and the other is waiting on the construction of the spring assemblies--small but essential. The drive part of the launcher is nearing completion.
The power supply for the 10 GHz klystron has been delivered.