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cso:instruments:sharcii:quickstart [2014-08-15 04:53] sradford |
cso:instruments:sharcii:quickstart [2015-06-24 06:16] (current) sradford |
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+ | ====== Quick Start Guide ====== | ||
+ | This quick guide outlines the steps necessary to start observing with Sharc II or Sharp. The [[http://www.submm.caltech.edu/~sharc/|Sharc]] and [[http://lennon.astro.northwestern.edu/SHARP|Sharp]] documentation have further details. Please also review the general [[cso:observing:operating]]. Remote observers, please review the remote observing [[cso:policy:remote_obs|policy]] and [[cso:observing:remoteobs|instructions]]. | ||
+ | |||
+ | ===== Setup ===== | ||
+ | |||
+ | - At the telescope, login to kilauea with the sharc account. Consult staff for password. \\ Remote observers, please use your own computer. | ||
+ | - Check the detector temperature is about 0.35 K. | ||
+ | * [[cso:observing:remoteobs#connect_to_the_vnc_desktop_s|Connect]] to view the fridge monitor. \\ ''comp% **csovnc.pl -l sharc sharc.fridge**'' | ||
+ | * Consult staff for passwords. | ||
+ | * [[cryo#Cycle]] the Sharc <sup>3</sup>He fridge at least a few hours before starting to observe. | ||
+ | |||
+ | === Telescope === | ||
+ | |||
+ | - [[cso:observing:remoteobs#connect_to_the_vnc_desktop_s|Connect]] to the UIP desktop. \\ ''comp% **csovnc.pl -l sharc uip**'' | ||
+ | * Consult staff for passwords. | ||
+ | - In the lower right xterm, login with the sharc account. \\ ''kilauea$ **ssh sharc@kilauea**'' | ||
+ | - Start the UIP. \\ ''kilauea/sharc> **uip**'' | ||
+ | - Enable control mode, if necessary. \\ ''uip> **pundit true**'' | ||
+ | - Point to the east at 45° zenith angle and open the [[cso:telescope:shutter|shutter]]. \\ ''__uip__> **az 90**'' ! East \\ ''__uip__> **za 45**'' ! for DSOS initialization \\ ''__uip__> **shutter /open**'' | ||
+ | * Avoid the sun. | ||
+ | * When [[cso:policy:remote_obs|remote observing]], please wait until 1 hour after sunset before moving the telescope or opening the shutter. | ||
+ | * At the telescope, | ||
+ | * Pull the red stop button before opening the shutter or moving the telescope, | ||
+ | * Check for possible collisions before slewing the telescope (ladders, sidecab, etc.), and | ||
+ | * Close all doors toward telescope. | ||
+ | - Set the UIP to continuum mode and select Sharc2. \\ ''__uip__> **instrument sharc2**'' | ||
+ | - Verify the tertiary mirror position and optical path. \\ ''__uip__> **tertiary /nasmyth2**'' ! included in **instrument** \\ ''__uip__> **vane /out**'' ! move the calibration load out of the beam | ||
+ | |||
+ | === SHARC === | ||
+ | |||
+ | - Check the filter wheel indicator on top of the cryostat. | ||
+ | * "250" => 350 µm, "500" => 450 µm, "750" => 850 µm | ||
+ | * For remote observing, this must be done in advance. | ||
+ | - For Sharp, check the half-wave plate (HWP) controller is on. | ||
+ | * It is at the bottom of the sharc electronics stack. | ||
+ | * Check the HWP angle is set to about 50°. | ||
+ | * The angle is displayed in increments of 0.01°. | ||
+ | * For remote observing, this must be done in advance. | ||
+ | - [[cso:observing:remoteobs#connect_to_the_vnc_desktop_s|Connect]] to the Sharc desktop. \\ ''comp% **csovnc.pl -l sharc sharc**'' | ||
+ | * Consult staff for passwords. | ||
+ | - Turn on the Sharc electronics. | ||
+ | * In the kilauea (lower right) xterm on the Sharc desktop, \\ ''kilauea% **sharcpwr on**'' | ||
+ | * At the telescope, you may use the alidade power controller switch (charge -> operate). | ||
+ | * On the instrument electronics, there two green lights and a yellow light will illuminate. | ||
+ | * Throw the power switch on the instrument electronics to //ON//. | ||
+ | * For remote observing, this must be done in advance. | ||
+ | * On the instrument electronics, two additional red lights will illuminate. | ||
+ | - For Sharp, turn on the HWP heater at least 30 min before observing. | ||
+ | * In the kilauea (lower right) xterm on the Sharc desktop, \\ ''kilauea% **sharphwp on**'' | ||
+ | - Login to sharcii, if necessary. | ||
+ | * In the sharcii (lower left) xterm on the Sharc desktop, \\ ''kilauea% **ssh sharc@sharcii**'' | ||
+ | - Configure the amplifier electronics and multiplexer. | ||
+ | * In the sharcii (lower left) xterm on the Sharc desktop, \\ ''sharcii% **cd ~/fpga** '' \\ ''sharcii% **go**'' | ||
+ | * This resets the instrument gain. | ||
+ | - Restart the DSP program. | ||
+ | * If necessary, stop the sharcServer and sharcClient. Normally these are not running. | ||
+ | * In the sharcii (lower left) xterm on the Sharc desktop, \\ ''sharcii% **cd ~/DSP **'' \\ ''sharcii% **sharcDSP **'' | ||
+ | * Wait a moment, then check the status. \\ ''sharcii% **s2 **'' \\ '' SHARC2> ** status **'' | ||
+ | * There should be 3x4 12's and 2 36's, like [[http://www.submm.caltech.edu/~sharc/operating/dsp_monitor_sample.txt|this]] | ||
+ | * Check the timestamp (UT) is updating. \\ '' SHARC2> ** status **'' | ||
+ | * If the timestamp does not update, try ''**status**'' again a few times. | ||
+ | * If that doesn't work, quit the status program and run ''**sharcDSP **'' again. | ||
+ | * If that still doesn't work, try the [[http://www.submm.caltech.edu/~sharc/operating/manual.htm#DSP_reset|DSP help page]] | ||
+ | * Quit the status program. \\ '' SHARC2> **quit** '' | ||
+ | - Start the IRC server. | ||
+ | * In the sharcii (lower left) xterm on the Sharc desktop, \\ '' sharcii% **cd ~/irc**'' \\ '' sharcii% **sharcServer**'' | ||
+ | * There are many messages. The last message will be \\ '' //hh:mm:ss.sss// EVENT Started org.mortbay.http.HttpServer@//xxxxxxx//'' | ||
+ | - Start the IRC client. | ||
+ | * In the kilauea xterm on the Sharc desktop, \\ ''kilauea% ** cd ~/irc** '' \\ ''kilauea% **./sharcClient**'' | ||
+ | * The popup message about the polarimeter being unavailable is normal. Dismiss it. | ||
+ | * If a popup message warns the DSOS RPC service is unavailable, the DSOS software is not running. | ||
+ | - Dismiss the popup, | ||
+ | - Stop both the IRC client and the IRC server, | ||
+ | - [[cso:telescope:dsos:userproc|Start]] the DSOS software, and | ||
+ | - Restart both the IRC server and the IRC client. | ||
+ | * Arrange the windows sensibly. \\ ''kilauea% **./sharcArrange**'' | ||
+ | * For Sharp, use instead \\ ''kilauea% **./sharpArrange**'' | ||
+ | * In the //Sharc Controls// IRC window, fill in the //Observation Options// fields (wavelength, observer, project). | ||
+ | - In the //Sharc Controls// IRC window, click the //Level Hardware// button. | ||
+ | |||
+ | === DSOS === | ||
+ | |||
+ | * Following the [[cso:telescope:dsos:userproc]] to start the active surface correction (DSOS). | ||
+ | * Wait until the sun is down and the shutter has been open for 1 hour. | ||
+ | * Wait for all but a few (1-3) DSOS temperatures to settle before observing. | ||
+ | |||
+ | |||
+ | ===== Observing ===== | ||
+ | |||
+ | ==== SHARC ==== | ||
+ | |||
+ | === Catalogs === | ||
+ | |||
+ | - Enter new sources in a source [[cso:telescope:uip:catalog|catalog]]. | ||
+ | * Some standard catalogs are in ''~sharc/.uip/cat/'' | ||
+ | * Edit source catalogs directly. | ||
+ | * Uses other sources as an example. | ||
+ | - For Sharp, load the source catalog \\ ''__uip__> **catalog sharp **'' | ||
+ | |||
+ | === Calibrators === | ||
+ | |||
+ | Observe calibrators to determine the best pointing and focus offsets and for flux calibration. | ||
+ | |||
+ | - Pick a calibrator using the ''[[cso:telescope:orrery|orrery]]'' on the UIP desktop. | ||
+ | - Track a calibrator. For example \\ ''__uip__> **planet uranus** '' //or// \\ ''__uip__> ** observe cal_crl2688 **'' | ||
+ | * For minor planets, etc., or if the ephemeris is out of date, use JPL Horizons ephemeris. \\ ''__uip__> ** planet ganymede /jpl **'' | ||
+ | * Check the [[http://www.skyandtelescope.com/observing/objects/javascript/jupiter|relative positions]] of the Jovian moons. They can be close enough to each other that more than one appears in the field of view. | ||
+ | * The names of all fixed calibrators start with //cal_//. Display all of them with \\ ''__uip__> ** ver cal_* **'' | ||
+ | - Start a Lissajous sweep. \\ ''__uip__> **sweep 30 20 /Y 20 14.142 /alt ** '' | ||
+ | - Set the integration time in the //Sharc Controls// IRC window to **120 sec**. | ||
+ | - Before starting a new exposure, //**always**// click the //Level Hardware// button level in the //Sharc Controls// IRC window. | ||
+ | * If a calibrator is really bright (Jupiter, Saturn, or Mars at opposition), offset the telescope before leveling. \\ ''__uip__> **azo 300 ** '' \\ level hardware \\ ''__uip__> **azo 0 ** '' | ||
+ | - Click the //Start// arrow in the //Sharc Controls// IRC window. | ||
+ | - Find the best pointing and focus by examining images of point sources. | ||
+ | * Check the focus every 30-45 min at the start of the night, every couple of hours thereafter. | ||
+ | * If the image is too "horizontal" (major axis from 2 o'clock to 8 o'clock), use a more negative focus offset. | ||
+ | * If the image is too "vertical" (major axis from 5 o'clock to 11 o'clock), use a more positive focus offset. | ||
+ | - Enter the pointing offsets. \\ ''__uip__> **fazo //az_offset// **'' \\ ''__uip__> **fzao //za_offset//**'' | ||
+ | - Enter the focus offset.\\ ''__uip__> **focus /offset //focus_offset// ** '' | ||
+ | |||
+ | === Targets === | ||
+ | |||
+ | Observing target sources is similar to observing calibrators. | ||
+ | |||
+ | - Track the target. \\ ''__uip__> ** observe //target// **'' | ||
+ | - Start a Lissajous sweep. \\ ''__uip__> **sweep 30 20 /Y 20 14.142 /alt ** '' | ||
+ | - Set the integration time in the //Sharc Controls// IRC window. | ||
+ | * This will depend on the program and on the weather. | ||
+ | * For deep integrations in good weather, 300 sec or 600 sec per exposure is typical. | ||
+ | - Before starting a new exposure, //**always**// click the //Level Hardware// button level in the //Sharc Controls// IRC window. | ||
+ | - Click the //Start// arrow in the //Sharc Controls// IRC window. | ||
+ | |||
+ | ==== Beam switching ==== | ||
+ | |||
+ | Beam switching is rarely used with Sharc but is more common for Sharp. | ||
+ | |||
+ | - Start the secondary chopper. \\ ''__uip__> **secondary 36.5 1.388888 4 4 ** '' | ||
+ | * The chopper waveform is displayed in the UIP desktop. | ||
+ | * Wait until chopper servo finishes tuning. | ||
+ | - Observe with a slow sweep. \\ ''__uip__> ** sweep 30 70 /y 20 50 /alt **'' | ||
+ | - For a calibrator, set the integration time in the //Sharc Controls// IRC window to **120 sec**. | ||
+ | - Stop the chopper \\ ''__uip__> ** secondary /stop **'' | ||
+ | |||
+ | |||
+ | ==== SHARP ==== | ||
+ | |||
+ | The Sharp [[http://lennon.astro.northwestern.edu/SHARP/observing.pdf|documentation]] outlines procedures and data reduction for Sharp observations. | ||
+ | |||
+ | ===== Data Analysis ====== | ||
+ | |||
+ | For routine observations, use [[http://www.submm.caltech.edu/~sharc/crush|CRUSH]] for data analysis. There are also some alternate tools for specific tasks. Each exposure is identified by a five digit number, //NNNNN//. | ||
+ | |||
+ | - [[cso:observing:remoteobs#connect_to_the_vnc_desktop_s|Connect]] to the quicklook desktop \\ ''comp% **csovnc.pl -l sharc sharc.ql**'' | ||
+ | - In an xterm, | ||
+ | * for faint sources, \\ ''kilauea% ** crush sharc2 -deep //NNNN1 NNNN2... // ** '' | ||
+ | * for medium sources, \\ ''kilauea% ** crush sharc2 //NNNN1 NNNN2... // ** '' | ||
+ | * for bright sources, \\ ''kilauea% ** crush sharc2 -bright //NNNN1 NNNN2... // ** '' | ||
+ | * and for extended sources, \\ ''kilauea% ** crush sharc2 -extended //NNNN1 NNNN2... // ** '' | ||
+ | * The options control the treatment of sky noise. See the [[http://www.submm.caltech.edu/~sharc/crush|CRUSH]] documentation for further information. | ||
+ | * For pointing observations, \\ ''kilauea% ** crush sharc2 -point -altaz //NNNNN// ** '' | ||
+ | * This will calculate new pointing offsets. | ||
+ | * Alternately, \\ ''kilauea% **cd ~sharc ** '' \\ ''kilauea% ** sharcpoint //NNNNN// ** '' | ||
+ | - View reduced images with [[http://ds9.si.edu|ds9]]. \\ ''kilauea% **ds9 ~sharc/src/data///imagename//.fits & ** '' | ||
+ | * The //imagename// is composed of the source name and the scan number, i. e., Mars.//NNNNN//.fits. | ||
+ | |||
+ | To analyse beam switched observations, | ||
+ | - [[cso:observing:remoteobs#connect_to_the_vnc_desktop_s|Connect]] to the quicklook desktop \\ ''comp% **csovnc.pl -l sharc sharc.ql**'' | ||
+ | - In an xterm, \\ ''kilauea% **cd ~sharc ** '' \\ ''kilauea% ** sharcchop //NNNNN// ** '' | ||
+ | |||
+ | |||
+ | ===== After observing ===== | ||
+ | |||
+ | - Close the shutter, stow the telescope, turn off the DSOS, etc. Following these [[cso:observing:operating#after_observing|instructions]]. | ||
+ | * When remote observing, close the shutter before sunrise. | ||
+ | - Stop the telescope scanning. | ||
+ | * In the xterm on the UIP desktop, \\ ''__uip__> **sweep /stop**'' | ||
+ | - Stop the chopper, if necessary. | ||
+ | * In the xterm on the UIP desktop, \\ ''__uip__> **sec /stop**'' | ||
+ | - Turn off the Sharc electronics. | ||
+ | * In the kilauea xterm on the Sharc desktop, \\ ''kilauea% **sharcpwr off**'' | ||
+ | * At the telescope, you may use the alidade power controller switch (operate -> charge). | ||
+ | - Turn off the Sharp HWP heater. | ||
+ | * In the kilauea xterm on the Sharc desktop, \\ ''kilauea% **sharphwp off**'' | ||
+ | - Stop the IRC client. | ||
+ | * On the Sharc desktop, open (deiconify) the //IRC - Instrument Remote Control// window. | ||
+ | * In the **File** menu, select **Exit**. | ||
+ | - Stop the IRC server. | ||
+ | * In the sharcii xterm on the Sharc desktop, \\ ''**exit**'' | ||
+ | - Set up a delayed <sup>3</sup>He fridge [[cryo#cycle|cycle]]. | ||
+ | * Only if good weather is expected. | ||
+ | * Coordinate with the staff. | ||
+ | * [[cso:observing:remoteobs#connect_to_the_vnc_desktop_s|Connect]] to view the fridge monitor. \\ ''comp% **csovnc.pl -l sharc sharc.fridge**'' | ||
+ | * Consult staff for passwords. | ||
+ | - Report any problems to the staff. | ||
+ | - Idle the telescope. \\ ''__uip__> **idle** '' | ||
+ | - Disconnect from the vnc desktops. |