AMiBA PROJECT WEEKLY MEETING MINUTES

Date: 1 February 2001

Participants: B. Martin, H. Wang, W. Warwick, M.Kesteven, J. Peterson, M.T. Chen, H.C. Lu, Y. J. Hwang, W. Ho, Homing Jiang, P. Shaw, Jackie Wang, Jean Cheng

Issues and Description	Action by			Output
MMIC
1. Leo has put the HPF simulation result on web, so everyone should take a look on it, and we will discuss it by next week. 2. Regarding the export license for the InP activities, Huei says he just got a massage from Al Lawrence of TRW, saying the Government has approved our request. Al will keep Huei informed how to proceed forward. 3. As for loaning some modules from JPL, Huei is keeping in touch with Todd closely. Todd is pushing very hard for NASA approval. Todd says he got a better noise temperature measurement on the new chips: 42K of band average. 4. We received a measurement data of the NRAO w-band amplifier, Paul will put it on web, and so everyone could read it. 5. Eugene says he just sent an amplifier back to Specek yesterday, and he will start to measure the mixers tomorrow. 6. Sub-harmonic mixer chips test result in ATNF for Huei & Eugene is good, the conversion loss is between 11`~13 dB, he will send over all data in detail to Huei and Eugene.	ALL H. Wang H. Wang H. Wang P. Shaw M. Sinclair			Next week Ongoing Ongoing Ongoing Ongoing Ongoing
Lag Correlator Hybrid
1. Huei is organizing the approval process for providing a model of GaAs HBT to Paul Robert. 2. Regarding the InP HBT multipliers, Paul says that he will do packaging testing in this week; probably in next week he should have some testing result coming out. 3. Regarding the LTC module fabrication for lag correlator using HBT multipliers, Warwick sent out some technical questions to the engineer of ACX in Taiwan ten days ago, and now waiting for the response. Paul asks Warwick forward a copy of that email to him and Eugene, so they could follow up for Warwick. 4. Regarding the 16-element correlator basis on mixer using power divider circuit, Jeff says they are continuing to test the individual mixer using noise source. now they are going to measure the stability of the output, but they don¡¦t have sensitive enough equipment to see the fluctuation of the output. So they will add the LNA to the output, and see if they can measure on that. In mean while, he is still waiting for out put of the producer for lag correlator, he will keep on pushing them. Jeff will be gone in the next two weeks to south pole, so he hopes something come out when he back. 5. As to the LNA, Warwick and Ray are still surveying the market to see if they can find out a suitable amplifier in die or chip form.	H.Wang P. Robert W. Warwick J. Peterson Ray Wei W. Warwick			Ongoing ongoing Ongoing Next meeting Ongoing
Receiver
1. The testing schedule for OMT in Tucson will be from Feb. 14 to 16. Mingtang will be in Tucson to go over the testing & assembly process for pre-production OMT. 2. We decide to go ahead to use a commercial window material for prototype. 3. As per request, Mal will provide a temperature sensor board to Mingtang. The cost is under $ 1,000AUD for each one, it is about half price of commercial one. 4. Regarding the vacuum window material, Mal will send a sample to Mingtang. 5. Mal will look at the summary on receiver design, which prepared by Mingtang; he will get back to Mingtang if any thing is needed to clarify. 6. Mingtang will send a feed horn mechanical drawing to Jeff. 7. Bob suggests setting up an area on web for mechanical drawings of parts in PDF file and Auto CAD file. Paul & Jean will take care and find out someway to organize the drawings. 8. Regarding the circular polarization issue, Mal has read the information from Jeff. and he says he probably can do some modeling on that. He will let us know what is going on afterward. 9. Mal will provide us the construction cost data of wave- guide in AT workshop. 10. Mingtang will prepare a sketch of lay out to show the space and location for the MMICs in two week.	M.T. Chen M.T. Chen M. Sinclair M. Sinclair M. Sinclair M.T. Chen P. Shaw J. Cheng M. Sinclair M. Sinclair M.T. Chen		Ongoing Ongoing Ongoing Ongoing Ongoing ASAP Ongoing Ongoing Ongoing
IF/LO
1. Warwick has received the technical data of fiber laser system from Eugene, and he agrees to buy one from IAA. Eugene will send the price information to Warwick. 2. As to the optical fiber, The Sumitomo in Tokyo informed Eugene that they don¡¦t have fiber in there stock and they will not produce it any more. Eugene will check with the Smithsonian Institution to see if they have extra fiber to provide us, and in the mean time he will continue to survey on the fiber products from other companies. Bob will be in Hawaii next week, may be he can enquire some, because as he know Smithsonian has a cut off plan, they probably could help us. Eugene will remind Bob to follow up by send an email next week. 3. John Payne raised a new idea about the photonic phase shifter on the LO system during his visit in Taipei, he suggests to us the piezo electrical stretcher instead of the expensive optical phase modulator, he also suggests to use the phase lock configuration to make a feed back control on the getter of fiber laser variation. These will the phase control stable in photonic way, and we don¡¦t need to use the mini meter wave phase switching module, this will reduce the insertion loss. The most difficult part in this new idea is adequate the photo mixer in the 15 GHz with sub harmonic mixer together to reduce the cost. If this success, then the total cost on the photonic phase shifter module will keep almost the same as a single commercial available optical phase modulator. John is working on that design in Tucson; he probably could work out some primary results within two months.		Y.J.Hwang. Y.J. Hwang B. Martin Y.J.Hwang		ongoing ASAP Ongoing Ongoing
Platform/Mount/Dishes
1. We placed a contract with CMA for two prototype small dishes. We are still finalizing the drawings for the small one and for the large one, to see what might be changed in order to reduce the cost. We would like to study the large one with the IEA first. Bob hopes to send those drawings around to people to look by the end of this week, particularly Phillip. At that time, Bob expects when circulate around, for what the final location of the optical parameters are, he hope everybody comment on that right away. According to the quote from CMA, the overall cost is lower than our budget. Paul will forward CMA quote to Jeff to look. Philippe will collect some material sample in Taiwan, and send it to CMA to look. 2. We place a contract with Vertex GmbH on the Design / feasibility study for hexapod mount as well as cost comparison hexapod mount vs. conventional mount, Vertex should submit a report in March. Bob will follow up and contact Vertex to ensure they will carry on the work properly. 3. Two weeks ago, there were 7 persons from the Chungshang Institute visiting us. We had a meeting to discuss with them about the platform and the mount for AMiBA. They don¡¦t have experience in hexapod mount, but have some experience in conventional mount. They would like to have a deep study in our case, and they could submit a proposal on conventional mount for us. Bob will send the specs to Chungshang institute when he has them ready. 4. A general overview on the prototype system including time schedule in a regular basis is necessary:Paul will place the work plan of each sub-system in prototype as well as the time schedule on the web site, so everyone could take a look. We will talk on those work plans in detail by next week.Due to the problem of the Specek amplifier, we need to find an optional post amplifier for receiver. Mal says they have the GaAs MMIC chips, but without testing and packaging. Mal thinks this could be an option for post amplifier. Mingtang will follow up this issue with Mal. For ensuring all MMICs we need for prototype are under control, Mingtang, Eugene and Leo will review the overall system of prototype.		B. Martin P. Rafin B. Martin B. Martin ALL M.T. Chen Y.J. Hwang H.C. Lu		Ongoing Ongoing Ongoing Feb. 8 ASAP
Work plan
We have received a work plan from Huei. T.H. Z.D., Mingtang, Eugene; and looking forward to receiving a plan from Bob. Bob will review it and discuss with all responsible person accordingly.
Annual report: we have received 11 reports; Jean is helping to unify them in a same format. In the mean time, all reports have been forwarded to ATNF and John Payne to review.
We have received an annual report from Warwick, Michael, Z.H., K.W. Ng, T.H./Ray, Mingtang, Eugene, Leo & Bob. Bob and Fred will review it before we could submit to MoE.
Next Meeting
7:30pm EDT, 8:30am Taiwan, 10:30 Australia, 4:30pm Tucson/Thursday/Feb. 8, 2001