From ldaddario at nrao.edu Tue Apr 1 09:39:27 2003 From: ldaddario at nrao.edu (Larry D'Addario) Date: Tue, 01 Apr 2003 07:39:27 -0700 Subject: [alma_na] System Block Diagram Rev F Message-ID: <3E89A49F.F6BEF8DA@nrao.edu> Thanks to those who provided comments and corrections on System Block Diagram Rev F, released on 2003-Mar-21. Your points will be taken into account in the next revision. We received no comments or other feedback from most IPTs prior to the March 31 deadline, which has now passed. As I mentioned in my Mar 21 email, this is taken to mean that you consider Rev F of the diagram to represent correctly the design of your part of the system, to the extent that it is now well defined. In areas where the design is not yet clear, differences of opinion on what the final design will look like are understandable and will have to be accepted. >From now on, IPT leaders are asked to ensure that the designs for which they are responsible remain consistent with the system block diagram. This means that Systems Engineering must be informed in advance of any design decisions that would lead to a discrepency. Systems Engineering will not attempt to specify design details that are below "system" level, but nevertheless must be kept informed and given an opportunity to review and comment on decisions. This will also enable us to keep the block diagram up to date. Regards, Larry ============================================================ Larry R. D'Addario Research Engineer National Radio Astronomy Observatory, Tucson, Arizona, USA 949 N Cherry Ave, Campus Bldg 65 7711 E Linden St University of Arizona Tucson, AZ 85715 Tucson, AZ 85721-0655 tel: +1/520/882-8240 x123 +1/520/885-8240 fax: +1/520/882-7955 Email: ldaddario at nrao.edu To locate me: 'finger -l larry at tuc.nrao.edu' ============================================================ From jbauer at nrao.edu Tue Apr 1 11:10:02 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Tue, 01 Apr 2003 11:10:02 -0500 Subject: [alma_na] NSF Bimonthly Report for Period Ending 31 January 2003 Message-ID: <3E89B9DA.3010100@nrao.edu> Everyone, The NSF Bimonthly Report for the Period Ending 31 January 2003 has been posted. It can be found at the following address: http://almaedm.tuc.nrao.edu/forums/alma/dispatch.cgi/1006northamerprojoffice/showFile/100203/d20030401160042/No/NSF%20BIMONTHLY%20REPORT%20DEC-JAN%202003.pdf Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Wed Apr 2 15:33:52 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Wed, 02 Apr 2003 15:33:52 -0500 Subject: [alma_na] JAO Material posted to ALMAEDM Message-ID: <3E8B4930.9090207@nrao.edu> Everyone, The Meeting Minutes of the 31st March JAO/IPT Meeting have been posted on ALMAEDM. They can be found at: http://almaedm.tuc.nrao.edu/forums/alma/dispatch.cgi/ipt1004jaogenacc/showFile/100075/d20030402202402/No/Meeting%20of%2031st%20March%202003.pdf The JAO Quarterly Report #3 has also been posted, it is located at: http://almaedm.tuc.nrao.edu/forums/alma/dispatch.cgi/ipt1004jaogenacc/showFile/100067/d20030402193953/No/JAO%20Quarterly%20Report%2031%20March%202003.pdf Regards, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From dsramek at aoc.nrao.edu Wed Apr 2 17:55:10 2003 From: dsramek at aoc.nrao.edu (Dick Sramek) Date: Wed, 02 Apr 2003 15:55:10 -0700 Subject: [alma_na] ALMA System Architect Message-ID: <3E8B6A4E.9B9A80E4@aoc.nrao.edu> To: ALMA staff From: R. Sramek, C. Haupt, ALMA System Engineering IPT Subject: ALMA System Architect Date: 2003-April-02 We are pleased to announce that Larry D'Addario has agreed to accept the job of ALMA System Architect within the System Engineering IPT. In this position Larry will be responsible for the system-level design of the ALMA telescope. Details of the scope of this position are given below. This is both a critically important and extremely difficult task for a project as complex and dispersed as ALMA. Please give Larry the support he needs in this work. ********************************* ALMA System Architect - Responsibilities The ALMA System Architect reports to the leaders of the Systems IPT and is responsible for: 1. establishing and maintaining the system-level design of the ALMA telescope; 2. establishing and maintaining performance specifications for each subsystem, and allocating error budgets across subsystems where appropriate; 3. maintaining documents that describe the system-level design and the subsystem specifications; 4. reviewing interfaces between and within subsystems for effects on performance; reviewing interfaces between subsystems for best use of resources. 5. monitoring the detailed designs to ensure conformity to the system-level design. Here "system-level design" includes: 1. the topology of the main signal path (Antenna, FE, BE, Correlator) 2. the general structure of all supporting subsystems (e.g. LO, M/C, OSF & AOS infrastructure, array configuration, etc). 3. signal processing algorithms and techniques; 4. choices of frequencies, bandwidths, and signal levels 5. software, high-level specifications only It does not include component selection, circuit design, or software design. 2003-April-02 R. Sramek C. Haupt From dsramek at aoc.nrao.edu Thu Apr 3 17:00:51 2003 From: dsramek at aoc.nrao.edu (Dick Sramek) Date: Thu, 03 Apr 2003 15:00:51 -0700 Subject: [alma_na] ALMA Week - Victoria Message-ID: <3E8CAF13.632CB9E1@aoc.nrao.edu> I've had a start at planning the upcoming ALMA week, now scheduled for June 2 through June 6 in Victoia, Canada. Attached is an EXCEL file with two sheets: 1) Participants 2) Agenda I understand that we are going to try to have a smaller ALMA week this year and will limit the number of participant to about 80. Accordingly, we've reserved a block of 80 rooms at a hotel in Victoria. The "Participants" sheet shows a distribution of 80 slots. At this time this is simply a suggestion, not an allocation of slots. In those cases where I know whom the IPT leads wish to invite, I've indicated initials; otherwise I just made a guess at the number. I ask the JAO and the various group leaders to tell me if: a) you don't need all of your slots b) you need more slots I've guessed that 10 resident HIA staff will wish to attend ALMA Week, but they don't need hotel rooms or travel support. If you have a better guess, let me know. We should reconcile this list and settle who is going to attend ALMA week by April 18. The "Agenda" sheet shows a first draft agenda. I've included all topics that I've heard suggested. The mornings are used for sessions of general interest; the Tue through Fri afternoons are for more specialized topics that might allow for a parallel session. Let me know if I missed sessions you would like hold or have indicated the wrong amount of time. If the agenda get's too crowded, we may need to drop some of these topics. This 1st draft will likely change considerably before it finalizes. ..DS.. -------------- next part -------------- A non-text attachment was scrubbed... Name: Agenda.xls Type: application/msexcel Size: 16896 bytes Desc: not available URL: From jbauer at nrao.edu Fri Apr 4 10:45:47 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Fri, 04 Apr 2003 10:45:47 -0500 Subject: [alma_na] Next NA DH Telecon on Monday, 7th April Message-ID: <3E8DA8AB.5030302@nrao.edu> Everyone, Below is the call in information for the NA Division Heads Meeting on Monday, 7th April. Apr 7 1 p.m. - 2 p.m., Daylight Savings Time ALMA NA DH Meeting Calendar: multiple cals Audio/Video/Both/Local: Audio (434-295-1363) Details: CVOIC/SOC280/TUC550 Have a good weekend! Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Mon Apr 7 11:05:34 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Mon, 07 Apr 2003 11:05:34 -0400 Subject: [alma_na] NA DH Telecon Today Message-ID: <3E9193BE.7000308@nrao.edu> Everyone, The NA DH Meeting will start today at 100 EDT as scheduled. We understand that the Tucson folks are meeting with Bob D'Angio from 930 to 1030 MST. That meeting will undoubtedly run into the Div. Heads meeting. Todays Division Heads agenda deals with budget issues. It would be very helpful for the Tucson folks to dial into the meeting, even if it is later than 100 EDT. Let's try to have all Tucson folks on the line by 200 EDT if at all possible. Richard will be distributing material in advance of this meeting. Thanks! Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From jbauer at nrao.edu Tue Apr 8 16:13:49 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Tue, 08 Apr 2003 16:13:49 -0400 Subject: [alma_na] Minutes from 7th April NA DH Meeting Message-ID: <3E932D7D.6050401@nrao.edu> are attached. Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: NADH Meeting 7th April 2003.doc Type: application/msword Size: 46592 bytes Desc: not available URL: From dsramek at aoc.nrao.edu Wed Apr 9 18:06:40 2003 From: dsramek at aoc.nrao.edu (Dick Sramek) Date: Wed, 09 Apr 2003 16:06:40 -0600 Subject: [alma_na] ALMA Week - Victoria V2.0 Message-ID: <3E949970.C4722836@aoc.nrao.edu> Attached is an Excel file with an updated DRAFT list of participants and DRAFT agenda for ALMA Week (AW). The agenda is still early draft; not all people indicated have been contacted. In planning sessions, I have used the priority given at the top of the agenda page. At this time I have a list of 80 people that IPT leads have requested to travel to ALMA Week. This matches the block booking of 80 rooms that James has made for us. Also, anticipating 10 local attendees, we will have about 90 people at the meeting dinner; to go beyond this substantially would require a change of venue. The FE IPT will have a full group meeting the week after ALMA Week, with 25 to 30 people in attendence. Therefore, FE attendence at AW is relatively sparse. I have made use of the large meeting room for morning plenary sessions plus three smaller rooms for group meetings in the afternoon (parallel sessions). *** James Di Francesco - Is the large conference room available on Friday afternoon for our closing plenary session? *** JAO - Do you approve this plan? If yes, please tell the IPT leads to invite participants within the guidelines. We have some unassigned slots plus some invitees will decline to attend. However, additional participants will have to be limited. Our risk is overflowing the facilities owing to last minute participants. I'll ask James for hard limiting numbers. We should circulate information to participants in the next few days to take advantage of advanced airline bookings. ..DS.. -------------- next part -------------- A non-text attachment was scrubbed... Name: Agenda V2.xls Type: application/msexcel Size: 24064 bytes Desc: not available URL: From jbauer at nrao.edu Thu Apr 10 14:30:07 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Thu, 10 Apr 2003 14:30:07 -0400 Subject: [alma_na] Next JAO/IPT Telecon Message-ID: <3E95B82F.6060908@nrao.edu> Everyone, The next JAO/IPT teleconference will be on Monday, 14th April at 10:30 am, 1430 UTC. Paul is aware that a majority of folks will be attending the AUI Visiting Committee Meeting in Green Bank that day. If you can break away from the VC meeting and call in, please do so, it's totally your choice. Apr 14 10:30 a.m. 1430 UTC JAO/IPT Meeting Calendar: multiple cals Audio/Video/Both/Local: Audio (434-295-1363) Details: CVOIC/SOC280/TUCN505 Regards, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From soliver at nrao.edu Thu Apr 10 16:04:03 2003 From: soliver at nrao.edu (Stacy Oliver) Date: Thu, 10 Apr 2003 13:04:03 -0700 Subject: [alma_na] [almanews] ALMA Memos 451 Released Message-ID: ALMA MEMO #451 SOME ERROR SOURCES FOR THE PWV AND PATH DELAY ESTIMATED FROM 183 GHZ RADIOMETRIC MEASUREMENTS AT CHAJNANTOR Guillermo Delgado(Onsala Space Observatory/European Southern Observatory) Fredrik T Rantakyr?(European Southern Observatory) Juan Pablo P?rez Beaupuits(European Southern Observatory) Lars-?ke Nyman (European Southern Observatory/Onsala Space Observatory) 2003/04/02 Keywords: Atmosphere, Phase variations, PWV, pathlength variations We present here an extensive study of the accuracy of the determination of the PWV from antenna measurements and in the determination of the pathlength variations (and thus phase variations). The study focussed on the effects of instrument measurement effects and software issues. We have also investigated the effect of the water vapour scale height and the presence of water vapour layers in the determination of the path delay. After correcting the software for the instrumental effects and applying empirically determined corrections to the path delay estimates we reached a good agreement between observed path delay variations and the inferred path delay variations determined from the PWV measurements. View a pdf version of ALMA Memo #451. http://www.alma.nrao.edu/memos/html-memos/alma451/memo451.pdf Download a postscript version of ALMA Memo #451. http://www.alma.nrao.edu/memos/html-memos/alma451/memo451.ps _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From ldaddario at nrao.edu Mon Apr 14 15:58:01 2003 From: ldaddario at nrao.edu (Larry D'Addario) Date: Mon, 14 Apr 2003 12:58:01 -0700 Subject: [alma_na] [almanews]ALMA Memo 452 is available Message-ID: <3E9B12C9.23A805A2@nrao.edu> ALMA MEMO #452 Passband Shape Deviation Limits Larry D'Addario (NRAO) Dated 2003/04/09 Submitted 2003/04/14 Keywords: passband calibration specifications Abstract: Beginning with the ideal passband, which is constant from Nf_s/2 to (N+1)f_s/2 and zero elsewhere, where N=0,1,2,... is the Nyquist interval number for sampling rate f_s, we examine the effect of deviations from that form on radio telescope performance. The implications for both continuum and spectroscopic observations are considered. Among the deviations of interest are: finite band edge slope, leading to non-zero response outside the Nyquist interval (aliasing); gain slope across the passband; gain ripple across the passband; and mismatch of the responses among antennas in an array. When analog filters are involved, the variation of response with temperature is also a consideration. Most of this report is applicable to radio telescopes in general, but numerical examples are selected for relevance to the ALMA telescope and specific recommendations for ALMA are given. Download a PDF file of ALMA Memo #452: http://www.tuc.nrao.edu/~ldaddari/alma/memo452.pdf _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews -- ============================================================ Larry R. D'Addario Research Engineer National Radio Astronomy Observatory, Tucson, Arizona, USA 949 N Cherry Ave, Campus Bldg 65 7711 E Linden St University of Arizona Tucson, AZ 85715 Tucson, AZ 85721-0655 tel: +1/520/882-8250 x123 +1/520/885-8240 fax: +1/520/882-7955 Email: ldaddario at nrao.edu ============================================================ _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From dsramek at aoc.nrao.edu Mon Apr 14 23:52:42 2003 From: dsramek at aoc.nrao.edu (Dick Sramek) Date: Mon, 14 Apr 2003 21:52:42 -0600 Subject: [alma_na] ALMA Week - Victoria V3.0 Message-ID: <3E9B820A.4961B789@aoc.nrao.edu> Attached is the latest participant list and agenda. I've tried to adjust the afternoon sessions to avoid conflicts. I've set aside time for various IPTs to resolve their ICDs. ALMA Week will run Monday morning thru Friday afternoon. James Di Francesco will distribute hotel and travel information and handle local arrangements. 1) I still have 3 slots set aside for JAO use; any special guests? If not, I'd let the IPTs use them to invite additional participants. 2) Gie Han - thanks for volunteering to organize the WVR review; would you (or Dick Kurz) please contact Richard Hills and see if he is available. I've put the WVR review and calibration discussions together at the end of the week. 3) I've added Mark Harmon to the FE list at Gie Hans request. 4) Michael Bocker, Jody Bolyard - I assume you will be arranging the safety presentation and discussions. Is one hour for the plenary session plus one hour in a smaller group meeting satisfactory? 5) JAO - I assume someone from the JAO will be contacting the Japanese and Leo B as the Chilean representative. 6) JAO - I suggest adding Jack Welch and Dave Woody for the Calibration meeting plus general involvement in ALMA. OK? Someone else? Please send me any changes to the schedule. Are there other critical items we should try to discuss and resolve at ALMA Week? ..DS.. -------------- next part -------------- A non-text attachment was scrubbed... Name: Agenda V3.xls Type: application/msexcel Size: 24576 bytes Desc: not available URL: From jbauer at nrao.edu Wed Apr 16 09:03:56 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Wed, 16 Apr 2003 09:03:56 -0400 Subject: [alma_na] ALMA Week Announcement Message-ID: <3E9D54BC.30506@nrao.edu> Everyone, Everyone, Please read the attached announcement regarding ALMA Week. Regards, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: ALMA Week Announcment to JAO in pdf.pdf Type: application/pdf Size: 59233 bytes Desc: not available URL: From jbauer at nrao.edu Thu Apr 17 09:50:35 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Thu, 17 Apr 2003 09:50:35 -0400 Subject: [alma_na] NA DH Telecon Monday, 21st April Message-ID: <3E9EB12B.1020508@nrao.edu> Everyone, The next North American Division Heads telecon will be on Monday, 21st April. Call-in information is below. Apr 21 1 p.m. - 2 p.m. 1700 UTC Time ALMA NA DH Meeting Calendar: multiple cals Audio/Video/Both/Local: Audio (434-295-1363) Details: CVOIC/SOC280/TUCN505 Have a great holiday weekend! Regards, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 Phone 434.296.0255 Fax E-mail: jbauer at nrao.edu -------------- next part -------------- An HTML attachment was scrubbed... URL: From dsramek at aoc.nrao.edu Thu Apr 17 16:39:03 2003 From: dsramek at aoc.nrao.edu (Dick Sramek) Date: Thu, 17 Apr 2003 14:39:03 -0600 Subject: [alma_na] ALMA Week details References: <3E940795.4000908@eso.org> Message-ID: <3E9F10E7.40902160@aoc.nrao.edu> IPT Leaders, Attached is a .pdf file with a note from James Di Francesco giving details of ALMA Week logistics. This was distributed earlier, but I wanted to emphasize that we are asking you to contact the members of your IPT who have been invited to ALMA Week; only the IPT leaders are getting our mailing at this time. At the moment, ALMA Week is limited to 80 (non-local) attendees. There are a few additional requests coming in, but I suggest we see how many unfilled slots we have before expanding the meeting. I will be on travel until April 27 and will only be answering e-mail sporadically. Please contact James Di Francesco for AW information. Also attached is a slightly modified draft agenda. The details of the smaller meetings are still changing, but I hope the plenary sessions and larger afternoon sessions are established. If any of you will not be able to attend ALMA Week, please contact Francesco. ..DS.. -------------- next part -------------- A non-text attachment was scrubbed... Name: ALMA Week Announcment.pdf Type: application/pdf Size: 59233 bytes Desc: not available URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: Agenda V3_1.xls Type: application/msexcel Size: 25088 bytes Desc: not available URL: From jbauer at nrao.edu Mon Apr 21 09:39:09 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Mon, 21 Apr 2003 09:39:09 -0400 Subject: [alma_na] From Paul Vanden Bout - re: ALMA Memo Series Message-ID: <3EA3F47D.4080604@nrao.edu> Regarding the ALMA Memo Series, My recent message announcing a review process for the ALMA Memo Series was apparently too cryptic. It has raised concerns that the free and open exchange of information will be damaged. Let me provide more information on what is planned. First, the policy of having some review, however little, is a policy of the ALMA Board. The Board did not want everyone on the planet to have the right to post memos to the Series, independent of their expertise or association with the Project or astronomy. The Board is not opposed to free and open exchange of information, only to the possibility of crackpots appearing in the Series because no one was looking. Further, in using the Series as a means of encouraging free and open exchange of ideas, the Board recognized that politically sensitive memos would appear, as they should. However, the Board did not feel such memos should appear in the Series until the Project had the time to prepare a response, should a response be necessary. So the JAO has asked Stacy Oliver to check with the Project Manager or Project Scientist before posting a memo to the Series. Unless we receive one entitled "ALMA Will Fail Because Einstein is Wrong" from an author in a mental institution, or something like that, the memo will be posted, immediately, in all cases except those where the Project would like a day or two to prepare an answer should the memo attract the attention of Congress, the NSF, the ESO Council, etc. But even then, the memo will be posted. No memo in the Series today would have been rejected by this "review". Paul Vanden Bout From rsimon at nrao.edu Mon Apr 21 10:40:51 2003 From: rsimon at nrao.edu (Richard Simon) Date: Mon, 21 Apr 2003 10:40:51 -0400 Subject: [alma_na] Requested Agenda items for today's IPT meeting Message-ID: <3EA402F3.6010801@nrao.edu> Marc, If time allows, can we discuss the following item's at today's IPT meeting? (1) Additional spending under the ATF task The following activities are currently being charged to the ATF task (2980), and have roughly reached our original estimate of the cost to complete. Is there an end in sight? These activities are outside the original scope of the ATF task, and may result in budget difficulties or use of contingency, depending on how much longer they continue at the present spending rates: - Completion of the Evaluation Front End - Completion of the Evaluation Back End - Completion of the Holography Receiver - Completion of the Prototype Nutator (2) New fiscal procedures: MIS and Fiscal are implementing procedures to verify that there is money in an account before an order is placed. (3) Current milestone status (Current version of next 3 months is attached). Regards, Richard Simon -------------- next part -------------- A non-text attachment was scrubbed... Name: ALMA_3months_summary_2003apr14a.pdf Type: application/pdf Size: 17158 bytes Desc: not available URL: From soliver at nrao.edu Tue Apr 22 11:24:26 2003 From: soliver at nrao.edu (Stacy Oliver) Date: Tue, 22 Apr 2003 08:24:26 -0700 Subject: [alma_na] [almanews] ALMA Memos 454 Released Message-ID: ALMA MEMO #454 Total Power Observing with the ALMA Antennas Jack Welch (UC Berkeley) April 2003 Particularly at the shorter wavelengths, the ALMA will need to do mosaic observing to cover large fields of view. Along with the mosaic pointing, there will need to be total power maps to fill in the interferometric short spacings and produce complete images. It is well known that this is best done with a single antenna that is two to three times the diameter of the interferometer antennas. However, that will not be possible for ALMA; there are no 24m - 36m antennas available that will work well to 0.35mm wavelength. As long as a mosaic of pointings is employed in the interferometry, a single antenna map made with one of the interferometer antennas will suffice in principle. This is rarely done, largely because the interferometer antennas are not usually equipped to do it. This capability must be in place for the ALMA antennas. How it is best done may be studied with the prototype antennas. View a pdf version of ALMA Memo #454. http://www.alma.nrao.edu/memos/html-memos/alma454/memo454.pdf _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From soliver at nrao.edu Tue Apr 22 16:06:40 2003 From: soliver at nrao.edu (Stacy Oliver) Date: Tue, 22 Apr 2003 13:06:40 -0700 Subject: [alma_na] [almanews] ALMA Memos 453 and 455 Released Message-ID: ALMA MEMO #453 An Integrated Sideband-Separating SIS mixer Based on Waveguide Split Block for 100GHz Band Shin'ichiro Asayama (Osaka Prefecture University/Nobeyama Radio Observatory), Hideo Ogawa (Osaka Prefecture University), Takashi Noguchi (Nobeyama Radio Observatory), Kazuji Suzuki (Instrument Development Center of School of Science, Nagoya University), Hiroya Andoh(Toyota National College of Technology), Akira Mizuno(Solar-Terrestrial Environment Laboratory, Nagoya University) April 2003 We have been developing an integrated sideband-separating SIS mixer at 100\ GHz based on waveguide split block. The measured single-sideband (SSB) receiver noise temperatures with L-band IF ($f_c$ = 1.5\ GHz ) are less than 60\ K in the LO frequency range of 90--115\ GHz, and minimum >value of around 35\ K is achieved at 100\ GHz. The image rejection ratios are more than 11\ dB in the frequency range of 90--110\ GHz. We have installed the sideband-separating SIS mixer into an atmospheric ozone measuring system at Osaka Prefecture University and successfully observed an ozone spectrum at 110\ GHz in SSB mode. This experimental result indicates that the sideband-separating SIS mixer is very useful for astronomical observation as well as atmospheric observation. View a pdf version of ALMA Memo #453. http://www.alma.nrao.edu/memos/html-memos/alma453/memo453.pdf ------------------------------------------------------------------------------------------------- ALMA MEMO #455 Cartridge Test Cryostats for ALMA Front End Y. Sekimoto, T. Kamba, S. Yokogawa, M. Sugimoto, T. Okuda, R. Kandori, K. Tatematsu, K. Muraoka, A. Ueda, T. Nishino, N. Okada, T. Fukuda, K. Kaneko, H. Ogawa, K. Kimura, K. Noda, K. Narasaki, and K. Suzuki April 2003 We have developed four cartridge test cryostats for ALMA FE cartridge-type receiver with taking account of reliability and easy operation. It uses a simple, compact and efficient thermal link between a cartridge-type receiver and a plate connected to a 3 stage Gifford-Mcmahon (GM) cryocooler. The cooling time of the cartridge-type receiver is less than 10 hours. With a cartridge loader, a cartridge-type receiver is easily inserted and extracted in a condition that the cryostat is closed. View a pdf version of ALMA Memo #455. http://www.alma.nrao.edu/memos/html-memos/alma455/memo455.pdf _______________________________________________ Almanews mailing list Almanews at listmgr.cv.nrao.edu http://listmgr.cv.nrao.edu/mailman/listinfo/almanews From jbauer at nrao.edu Fri Apr 25 15:55:50 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Fri, 25 Apr 2003 15:55:50 -0400 Subject: [alma_na] Meeting Minutes from the NADH 21st April Meeting are attached Message-ID: <006a01c30b64$ac250bd0$bb7521c0@cv.nrao.edu> Have a great weekend! Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0455 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: NADH Meeting 21st April 2003.doc Type: application/msword Size: 51712 bytes Desc: not available URL: From jbauer at nrao.edu Mon Apr 28 14:42:06 2003 From: jbauer at nrao.edu (Janet Bauer) Date: Mon, 28 Apr 2003 14:42:06 -0400 Subject: [alma_na] ALMA Week Announcement Concerning Hotel Reservations - IMPORTANT, please read! Message-ID: <003701c30db5$de42b060$bb7521c0@cv.nrao.edu> Everyone, Attached is an announcement regarding hotel reservations at the upcoming ALMA week. Please read it and make your reservations in the next three days - if you don't two things may happen! The first is that you may not be able to get a room at the guaranteed rate or the second is that you may not get a room at all! Don't forget, Victoria is a nice place to visit and has a healthy tourist industry! Regards, Janet Janet Bauer ALMA Project Secretary NRAO - ALMA North American Project Office 2496 Old Ivy Road, Suite 226 Charlottesville, VA 22903 434.296.0296 (phone) 434.296.0455 (fax) jbauer at nrao.edu (E-mail) -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: ALMA Week Second Announcement.pdf Type: application/pdf Size: 17268 bytes Desc: not available URL: