AMiBA PROJECT WEEKLY MEETING MINUTES

Date: 16 November 2000

Participants: K.Y.Lo, H. Wang, M. Kesteven, C. H. Lu, R. Pelleau, J. Li, P. Shaw, J. Wang , Jean Cheng

Issues and Description	Action by			Output
General
Fred says that last week he had a talk with Paul and Bob about the whole project and so on, they should cost estimate and he guess we are getting closer but not bearing yet, indications are as usual and not surprisingly, the cost will be higher than money afford. He just wants to bring it up and so it is in the record, and also people heard this. In all design we do need to think about how to minimize the cost. He just wants warning everyone. Not surprising, but he thinks we do need to remind ourselves, and from now on, we do need to take this very seriously.
MMIC- W- Band InP HEMT LNA
1. Huei says that the fabrication run in TRW for the 0.15£gm GaAs PHEMT process has been delivered to Taipei. This is his first iteration design on the Subharmonic Mixer designed by Eugene. Huei will bring the chips to Mal by early Dec. while he participates in the Microwave Conference in Sydney. Mal asks Huei to provide the relevant chip design data to him, and in the mean time he will check the program of the lab to see when they are able to measure that chip for Huei. Our target is to have all measurement results by late Dec. 2. Regarding the Sub Hamonic Mixer¡¦s chip test at ATNF, Huei asked Mal last week whether AT could make three more mixers isolation measurements. Mal says that they are planning to do at least two of those in late Dec. once they finish the installation of receiver. But on measurement has a lot of difficulties been doing, because of it requires a certain device, which they don¡¦t have. 3. Huei says that according to the agreement with Todd, he will send the first InP HEMT chip design to JPL today. Huei will ask Todd whether he need to another new design for JPL or not. 4. As for the 0.1um GaAs HEMT, Huei says the chip is ready shipped to TRW, and finally CIC signed the contract with TRW. 5¡K.As to the export license application for the InP HEMT of TRW, Fred received a notice from The American Institute In Taiwan informing they are asking the Coordination Council for North American Affairs Headquarters to investigate whether ASIAA has applied to purchase the MMIC wafers for InP HEMT and InP HBT. Paul has contacted the person in charge in the CCNAA, Paul will write an official letter to CCNAA to answer the questions AIT. 6. Regarding the Wave-guide filter, Huei received a copy of design description and some dimensions from George Grace. George will send some drawings to Huei later on. 7. Leo will prepare a specification for HPF, in the mean time he will make a simulation on that design. Then he will present the simulation result to every to review and comment. 8. Regarding the InP MMIC, Mal says that the test result for the K-band amplifier is pretty close with their prediction. Russell has been fixing up some problems. They have one amplifier completed; they will test it by this week. Mal will tell us about the result by next week. 9. Regarding the Specek's amplifiers, Prof. Chu has given the green light for shipment to Specek. Now we are waiting for the shipping date confirmation from Specek. 10. Regarding the NRAO W-band amplifiers, Mintang received some technical information from NRAO. Leo has some questions on that information, and need to clarify with the engineer of NRAO.	H. Wang M. Sinclair H.Wang H.Wang H. Wang P. Shaw H. Wang H.C. LU M. Sinclair T.H. Chu H.C.Lu			ongoing late Dec. on schedule on schedule ASAP ongoing ASAP Next week ongoing ongoing
Lag Correlator Hybrid
1. Jeff says if we could use the alumina for the transmission line in the correlator, the area required for the whole correlator would be 5 times smaller. Currently some of his students are working on this study and doing some calculation. And it needs a couple of weeks more to know the answer. 2. Warwick says he did few measurements on the narrow band prototype correlator and it seems going very well and it is working quite nicely at the 3 GHz bandwidth. And the next thing is to do the noise measurement. 3.Paul Shaw is trying to put together a comprehensive cost analysis for the whole project, and we need to have a cost projection for the whole thing including correlator. Warwick says that he has been trying to get a quote from the ACX company in Taiwan on the packaging correlator, and their offer would be the fundamentals to start that cost projection.	J. Peterson W. Wilson W. Wilson			ongoing ongoing ongoing
Receiver
1. Leo has completed the Dewar layout according the dimention of Specek¡¦s amplifier; he will make another layout which base on the NRAO¡¦s amplifier. 2. Regarding the collaboration proposal on the development of NRAO OMT, John is working on pricing and time schedule in details. 3. Michael has read Mingtang¡¦s linear feed horn design data. He thinks it is pretty close to what they want, and only a slight change on the junction with mirror is suggested to do. 4. Jeff says that he has made a design for feed horn year ago, and it is very easy to machine. He will send that design data to Mingtang to look at. 5. Mingtang is planning to visit ATNF in early Dec, Mingtang will talk with Mal further to finalize his schedule.	H.C. Lu M.T.Chen J. Payne J. Peterson Mingtang		ongoing ongoing ongoing ongoing ongoing
LO/IF
1.Eugene just generates a NRAO visit report today; he will circulate it to everyone to look at. We will put it on the ASIAA web site, and welcome everyone to take a look and to comment. 2.Eugene is working on ¡§the wideband LO noise effect calculation¡¨; he will send over to everyone to look at once finished. 3. Michael says that Warwick has some comments on Eugene¡¦s calculation.		Y.J. Hwang Y.J. Hwang		DONE DONE
Platform/Mount/Dishes
1.Jeff doesn¡¦t think the caesarian could work with the 30cm antenna due to its high ground pick up. He will do some quantitative analysis to demonstrate this case. 2.Regarding the CMB Ground Shield, Michael and Ravi have worked out some comments, and sent them over to Bob and Jeff. Michael thinks 20 degrees will be a compromise limiting elevation angle for observation. With the 30cm close-packed array, we require a wall of height 2.20m at 4m distance from mount. 3.As to the feed leg supporting structure for dishes, Michael will send some information to us. 4. Philippe has contacted the firm in Germany ¡V MAN, and asking quote for dishes, but up to now no response. Michael will help us to find out other source. 5. Bob currently is visiting the firm in Germany "Vertex GmbH", he talked with Klus Duespohl of Vertex about our AMIBA mounts and platforms. They appear to be very interested in our project. He told Klus we might approach the project as 3 phases: (1). Design contract & price analysis, (2). Construction of the first prototype mount, and (3). Construction of a further 2 mounts. He has arranged to discuss this further with them in Nov.17 in Germany. 6. Michael will help us to find out an alternative source other than the Vertex to design and to build the prototype mount.		J. Peterson M.Kesteven M. Kesteven B. Martin M. Kesteven		ASAP ASAP ASAP Nov.17 ASAP
Site acquisition
Prototype Specification and Project Book
Traveling
Jeff ~ Nov.20
Next Meeting
7:30pm EDT, 8:30am Taiwan, 10:30 Australia, 4:30pm Tucson/Thursday/Nov. 23. 2000