From awootten at nrao.edu Mon Jan 3 17:45:58 2005 From: awootten at nrao.edu (Al Wootten) Date: Mon, 3 Jan 2005 17:45:58 -0500 Subject: [asac] Draft Agenda for ASAC Telecon Tuesday 4 January 2005 Message-ID: <16857.52006.443886.157941@polaris.cv.nrao.edu> ASAC Telecon Tuesday 4 January 2005 Conference Date: 2005-January-4 (Tuesday) Here's the dial-in information for the telecon: CALL TIME: 1030 am EST or 15:30 UT CALL DATE: 4 January-2005 (Tuesday) DURATION: 1 hr * USA Number: 877-874-1919 * Outside USA Number: +1-203-320-9891 * Passcode: 185064 * Leader: Al Wootten Draft Agenda for ASAC Telecon Tuesday 4 January 2005 http://www.cv.nrao.edu/~awootten/mmaimcal/asac/asacjan05agenda.html From turner at astro.UCLA.EDU Thu Jan 13 18:59:35 2005 From: turner at astro.UCLA.EDU (Jean L. Turner) Date: Thu, 13 Jan 2005 15:59:35 -0800 (PST) Subject: [asac] February meeting Message-ID: <57022.128.97.69.238.1105660775.squirrel@webmail.astro.ucla.edu> Dear ASAC: I have just received word from Bob Dickman that we should proceed with our meeting on February 24-25 in Garching. There are still no charges. The next Board telecon is January 27, and I will be attending. Perhaps there will be news then. Jean -- Jean L. Turner, Professor Division of Astronomy & Astrophysics, UCLA Box 951547 Los Angeles CA 90095-1547 1-310-825-4305 fax: 1-310-206-2096 http://www.astro.ucla.edu/~chicag/intro.html From ccarilli at aoc.nrao.edu Fri Jan 14 12:55:12 2005 From: ccarilli at aoc.nrao.edu (Chris Carilli) Date: Fri, 14 Jan 2005 10:55:12 -0700 Subject: [asac] minutes Pan-ALMA subcommittee telecon In-Reply-To: <41E3F15F.6020104@aoc.nrao.edu> References: <41DAC691.7060609@aoc.nrao.edu> <41E3F15F.6020104@aoc.nrao.edu> Message-ID: <41E80780.4080709@aoc.nrao.edu> January 14, 2005 From: Carilli To: J. Turner, chair ASAC re: Pan-ALMA science meeting 2006 cc: ASAC, R.Baschiller, J. Cernicharo, T. Wilson, A. Wootten Jean, The Pan-ALMA science meeting sub-committee met on Feb 14, 2005. Attached are minutes from the meeting. We will present a proto-plan for comment at the ASAC meeting in February. Chris Carilli NRAO Socorro NM USA -------------- Minutes Pan-ALMA subcommittee telecon Jan 14, 2005 Attending: Carilli, Wootten, T.Wilson, Testi, Bachiller Absent: P.Cox Carilli introduced the Pan-ALMA science meeting. The ALMA project has expressed the desire to have semi-regular meetings to discuss ALMA science,and up-date the community on ALMA. The first international meeting of this type was in Washington DC, 1999, sponsored by NRAO/AUI/Wootten. Note that these international meetings are meant to be of larger scientific scope than the regional meetings (eg. Maryland May 04, or the ESO ALMA open-days). The ASAC has discussed such a meeting informally for the last two years. In Fall 2004 the Spanish ALMA community presented a formal proposal to the ASAC to host the meeting sometime in 2006 in Madrid. This invitation has focused the ASAC, to the degree of the formation of the subcommittee to consider the options, and present plans to the ASAC in Feb 2005. Spanish invitation: Bachiller then discussed the spanish invitation. The spanish ALMA national committee proposes to host the meeting in Madrid, hopefully at the Congress palace. The official invitation to the ASAC suggested Spring 2006, but the ASAC has requested Fall 2006. Fall 2006 should be ok for the Spanish community. the congress hall is already booking up, so they need dates soon after the ASAC Feb meeting. Could use university for free, but not at center of city. AI: ASAC formalize acceptance of spanish invite Funding: Bachiller and Wilson have investigated funding options. The target cost for hosting at the Congress hall is 50kEuro. We expect about 1/3 of this from the registration fees (120Euro), 24 kE from the Spanish ALMA community, and 8kE from ESO/Radionet. The US payed for the Washington meeting, so funding should come from europe. The washington meeting cost 11k$ + 3k$ for hall (after subtracting reg fee). AI - Wilson, Bachiller firm-up funding promises. AI -- will Japan contribute funds? Dates: All agreed that Fall 2006 is OK. Beginning of Oct is already booked. Sept is too close to IAU. Current time frame is late Oct. conflicts: NRAO 50th Oct 14, 15. Maryland meeting -Oct 10-15 IAU - Aug Note from Fukui -- japan wants international meeting next year as well? could be community meeting or full international? Could be a conflict. AI: ASAC should set date and tell Spanish. AI: Carilli check for other conflicts AI: Get info from Japanese rep at ASAC meeting Format: total length of 3.5 days, with mostly plenary science talks, with 1 day or so dedicated to current ALMA status and eventual capabilities. No major parallel sessions are planned, although smaller meeting rooms might be useful. Expect on order of 200 participants, as in Washington. In fall 2006 we expect 1 ant on site. AI: ASAC discuss format LOC: Bachiller, Cernicharo, others SOC: Current subcommittee-- Carilli,Wootten,T.Wilson,Testi,P.Cox, Bachiller plus: Japanese rep, chilean rep, ASAC suggestions? (limit to 12 max). Proceedings -- yes (ugh!). Kluwer? --------------- From turner at astro.UCLA.EDU Wed Jan 19 13:57:16 2005 From: turner at astro.UCLA.EDU (Jean L. Turner) Date: Wed, 19 Jan 2005 10:57:16 -0800 (PST) Subject: travel arrangements [asac] February meeting] Message-ID: <61642.128.97.69.238.1106161036.squirrel@webmail.astro.ucla.edu> Dear ASAC: Tom Wilson has sent the following information regarding the Feb 24-25 meeting arrangements in Garching. -- Jean L. Turner, Professor Division of Astronomy & Astrophysics, UCLA Box 951547 Los Angeles CA 90095-1547 1-310-825-4305 fax: 1-310-206-2096 http://www.astro.ucla.edu/~chicag/intro.html **************************************** In regard to the ASAC meeting, please have the members send their itinerary and hotel needs for the meeting. The alma_admin at eso.org address is the safest location to which they can send the information. Regards, Tom Wilson From cwhite at nrao.edu Fri Jan 28 08:30:20 2005 From: cwhite at nrao.edu (Carolyn White) Date: Fri, 28 Jan 2005 08:30:20 -0500 Subject: [asac] [almanews] Recent ALMA Memos Message-ID: ALMA Memo # 510 The ALMA Digitizer (DG) Demultiplexer : Design, Performances in DG Assembly and Production Acceptance Tests Cyril Recoquillon Alain Baudry Jean-Baptiste Begueret Stephane Gauffre Guy Montignac 2004-12-13 Keywords:Demultiplexer/Deserializer, SiGe technology, High-speed digital circuit, Self-test, Digitizer assembly Abstract: A high frequency, low power 1:16 deserializer has been developed using the 0.25?m BiCMOS SiGe technology from ST Microelectronics to meet the ALMA project requirements. The input shift register is clocked at 4 GHz and the output data are transferred at 250 MHz. Nominal operation has been observed up to 8 GHz. With 2.5 V supply, the circuit dissipates around 650 mW an especially low value compared to existing similar circuits. The chip is available in an industrial package and exhibits low thermal resistance (about 25 ?C/W) thus implying long lifetime as required for the ALMA project. Functional tests including those performed with a self-test block embedded in the deserializer are briefly described. Our deserializer is integrated in a prototype ALMA Digitizer assembly which includes a 3-bit (8-level), 4 GS/s sampler developed with the same SiGe process. Based on Digitizer state counts measurements, Allan variance tests and long term operation in the laboratory environment, we conclude that the prototype Digitizer assembly is operational. The deserializer chip has reached the final production stage after static and dynamic qualification tests have been performed on a first restricted number of production chips. ---------------------------------------------------------- ALMA Memo # 511 Cycle-Slip-Free Fiber Length Stabilization System Using a Digital Phase and Frequency Discriminator Yohei Sato, Mitsuru Musha, Ken'ichi Nakagawa, Ken-ichi Ueda, Akitoshi Ueda, Masato Ishiguro 2004-12-15 Abstract: We have developed a fiber length stabilization system (FLSS) for the photonic distribution of LO signals by using a digital phase and frequency discriminator (DPFD). Compared with a conventional analog double-balanced mixer (DBM) or a phase sensitive detector with an XOR gate (PSD), the DPFD has wider linear discrimination range by more than 1000 times, which enables cycle-slip-free FLSS. Moreover, it makes possible to stabilize the length of the fiber that is longer than the coherent length of the light source used in FLSS. ---------------------------------------------------------- ALMA Memo # 513 Design and Simulation of a Waveguide Load for ALMA-band 9 F. P. Mena A. M. Baryshev 2005-01-07 Abstract:An important element of any waveguide-based dispositive is the termination or load. At relatively large wavelengths the idea is to make them as compact as possible and usually contained inside of the waveguide. However, as the working frequency increases, the involved dimensions make more difficult such approach. In this memo, we describe a relatively simple waveguide load which is appropriate when the waveguide dimensions are prohibitory small. The load described here is rather large compared with the waveguide making it relatively easy to realize at small dimensions. Moreover, from the results of a simulation it is shown that besides its simplicity it can have a reflectivity as low as -40 dB if the appropriate material is used. _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From awootten at nrao.edu Fri Jan 28 13:18:20 2005 From: awootten at nrao.edu (Al Wootten) Date: Fri, 28 Jan 2005 13:18:20 -0500 Subject: [asac] Telecon 1530UT 2005-Feb-1 Message-ID: <16890.33260.131283.975643@polaris.cv.nrao.edu> Folks, An agenda is under construction. Contact Information * 2005-Feb-1 15:30 UT * Duration: 1 hr * USA Toll Free Number: 877-874-1919 * Toll Number: +1-203-320-9891 * Passcode: 185064 * Leader: Al Wootten Clear skies, Al From awootten at nrao.edu Mon Jan 31 12:56:15 2005 From: awootten at nrao.edu (Al Wootten) Date: Mon, 31 Jan 2005 12:56:15 -0500 Subject: [asac] Agenda for tomorrow Message-ID: <16894.28991.987185.175394@polaris.cv.nrao.edu> Dear folks, Contact Information * 2005-Feb-1 15:30 UT * Duration: 1 hr * USA Toll Free Number: 877-874-1919 * Toll Number: +1-203-320-9891 * Passcode: 185064 * Leader: Al Wootten To view the agenda, please visit the ASAC Wiki at https://wikio.nrao.edu/bin/view/ALMA/AlmaSac and follow the hyperlink to the agenda. Clear skies, Al +--------------------------------------------------------+ | Alwyn Wootten (http://www.cv.nrao.edu/~awootten/) | | Project Scientist, Atacama Large Millimeter Array/US | | Astronomer, National Radio Astronomy Observatory | | 520 Edgemont Road, Charlottesville, VA 22903-2475, USA | | (434)-296-0329 voice Help us build The ALMA| | (434)-296-0278 FAX {> {> {> {> | +----------------------------------^-----^-----^-----^---+