February 20, 2002
Work on the floating coil cryostat continues at Ability Engineering Technology in Chicago, IL.
The thermal shield was tested successfully for gas flow rate through its heat exchanger and is now being final fitted to the He pressure vessel and minor details are adjusted for final fit. The completed shield is shown below.
Previously, it was determined that the vacuum vessel outer ring as machined did not meet specifications. A detailed plan was agreed upon to ameliorate the effect of this error on the project. Work is proceeding on this plan.
After not obtaining any acceptable bids for the construction of the designed cryogenic bayonet feed-throughs for cooling the floating coil, a significant redesign of the bayonet was made to simplify it for manufacturing and a new, simplified, conceptual design was decided upon. Work on the manufacturing drawings will begin this week. MIT will oversee the construction and testing of the bayonets prior to their installation in the cryostat.
Darren Garnier traveled to Ability on 2/15/01 to inspect the assembly.
The wound coil as well as all equipment necessary for VPI has been delivered to the plant "Novaja Sila". After transportation the winding was checked and found to be in a good condition. The winding is now under VPI procedure at the "Novaja Sila" plant. After epoxy impregnation the winding will be returned to the Efremov plant to be cleaned and checked before assembly into the clamped structure. The coil and the VPI setup is shown below.
All metals for the cryostat manufacturing has been received by Efremov. The main parts of the helium vessel, which are necessary to start assembling of the coil in the cryostat, are now being machined. Efremov has begun to make samples of all kind of welding seams at room and liquid nitrogen temperatures in order to check their mechanical strength. The samples will be tested for both shear and tensile strength.
The quench protection system has been assembled and tested under high voltage and current. The tests were successful but they would like to make some improvement in operation of the control unit. SINTEZ has begun to write manuals for the quench protection and quench detection systems and for the test at SINTEZ and operation at MIT.
SINTEZ have received all items necessary for bonding tests between the G10 tubes and the stainless steel ends for the helium vessel support structure. They are now assembling four tube samples to be tested at the room and liquid nitrogen temperatures, including cyclically cooled samples.
The first set of the cryostat drawings have been inspected at MIT. Our notes and suggestion were forwarded to Everson Electric to be implemented in the manufacturing drawings.
Chen-yu Gung visited Everson Electric on February 5 - 8 to participate in a trial winding of a dummy conductor. In a preparation to the trial winding he checked the alignment of all the bolt holes on the thick center plate, the stainless steel winding mandrel, the heavy copper ring and the mating stainless steel backing ring. The alignment appeared to be good. The two thick side plates for a winding support have been machined, covered with mold release and baked. Two 1/8" stainless steel covers have been manufactured. The coil side surface of each cover was roughened by sand blasting in order to have better bonding surface to the epoxy, The blasting process produced some budging of the cover surface, and, as a result, Everson Electric is revising the initial winding and VPI procedures.
The launcher/catcher upper drive is nearing completion after a redesign of the bellows protection system.