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Unverified Commit 486bee49 authored by delphineaz's avatar delphineaz Committed by GitHub
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antenna.html
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......@@ -122,12 +122,12 @@ is designed to compensate for the gravitational deformations of the whole surfac
<p>In the current call for proposals, the following (cryogenically-cooled) receivers are available in both single-dish and VLBI modes:</p>
<table border="1" class="docutils">
<colgroup>
<col width="13%" />
<col width="12%" />
<col width="11%" />
<col width="13%" />
<col width="12%" />
<col width="14%" />
<col width="13%" />
<col width="36%" />
<col width="12%" />
<col width="39%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">RF band (GHz)</th>
......@@ -165,11 +165,11 @@ is designed to compensate for the gravitational deformations of the whole surfac
<td>90</td>
<td>0.8</td>
<td>0.45-0.65</td>
<td>TP,DFB,DBBC,ROACH1,SARDARA (MB),XARCOS(MB)</td>
<td>TP (MB),DFB,DBBC,ROACH1,SARDARA (MB),XARCOS(MB)</td>
</tr>
</tbody>
</table>
<p>(MB) means that the Multi-Beam option is available for observations in K-band with the XARCOS and SARDARA backends.</p>
<p>(MB) means that the Multi-Beam option is available for observations in K-band with the TP, XARCOS and SARDARA backends.</p>
<ul class="simple">
<li>The single-feed, L-P band dual-frequency receiver was installed at the primary focus of the telescope, and therefore requires the parabolic configuration. It allows for simultaneous observations at L and P bands. The polarization type is linear but is also transformed to circular thanks to a hybrid converter.</li>
<li>A single-feed C-high band receiver is installed at the Beam Wave Guide (BWG) focus of the telescope. The polarization type is circular.</li>
......@@ -257,11 +257,12 @@ Additionally, a number of high-energy receivers are being planned for the SRT. T
<p>For the PPP receiver (P-band), there is one available filter (with code L2XX for linear or C2XX for circular): 300–360 MHz (which is needed to exclude RFI at higher frequencies).</p>
<p>For the LLP (L-band) configuration, the following filters are available for linear or circular polarizations:</p>
<blockquote>
<div>XXL1 (for linear) or XXC1 (for circular): all band, 1300–1800 MHz (no filter) (not recommended)
XXL2 (for linear) or XXC2 (for circular): 1320–1780 MHz
XXL3 (for linear) or XXC3 (for circular): 1350–1450 MHz (VLBI band)
XXL4 (for linear) or XXC4 (for circular): 1300–1800 MHz (band-pass)
XXL5 (for linear) or XXC5 (for circular): 1625–1715 MHz (VLBI band)</div></blockquote>
<div><p>XXL1 (for linear) or XXC1 (for circular): all band, 1300–1800 MHz (no filter) (not recommended)</p>
<p>XXL2 (for linear) or XXC2 (for circular): 1320–1780 MHz</p>
<p>XXL3 (for linear) or XXC3 (for circular): 1350–1450 MHz (VLBI band)</p>
<p>XXL4 (for linear) or XXC4 (for circular): 1300–1800 MHz (band-pass)</p>
<p>XXL5 (for linear) or XXC5 (for circular): 1625–1715 MHz (VLBI band)</p>
</div></blockquote>
<p>For simultaneous LP observations, all combinations of the above configurations are allowed.</p>
<ul class="simple">
<li>Additional filters</li>
......@@ -272,6 +273,86 @@ XXL5 (for linear) or XXC5 (for circular): 1625–1715 MHz (VLBI band)</div
<div class="section" id="backends">
<h1>Backends<a class="headerlink" href="#backends" title="Permalink to this headline"></a></h1>
<p>The frontend (receiver) outputs are connected to the backend instruments either by coaxial cables or optical fibers, depending on whether the backend is located in the main building or below the dish. The following backends, designed for specific scientific activities, are available at the site:</p>
<p>These backends are available for the current call for proposals:</p>
<table border="1" class="docutils">
<colgroup>
<col width="15%" />
<col width="9%" />
<col width="19%" />
<col width="20%" />
<col width="15%" />
<col width="22%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Backend</th>
<th class="head">Bands</th>
<th class="head">Bandwidth (MHz)</th>
<th class="head">Type</th>
<th class="head">Sampling time</th>
<th class="head">Max frequency bins</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><strong>Total Power</strong></td>
<td>C,K</td>
<td>250,680,1200,2000</td>
<td>analog/total power</td>
<td>1-1000 ms</td>
<td>1</td>
</tr>
<tr class="row-odd"><td><strong>XARCOS</strong></td>
<td>C,K</td>
<td>0.5,2.0,7.8,62.5</td>
<td>spectro-polarimeter</td>
<td>10s</td>
<td>2048</td>
</tr>
<tr class="row-even"><td><strong>SARDARA</strong></td>
<td>C,K</td>
<td>420, 1500(1200)*</td>
<td>spectro-polarimeter</td>
<td>down to 5ms</td>
<td>1024 or 16384</td>
</tr>
<tr class="row-odd"><td><strong>SARDARA</strong></td>
<td>L</td>
<td>128,256,460</td>
<td>spectro-polarimeter</td>
<td>down to 5ms</td>
<td>1024 or 16384</td>
</tr>
<tr class="row-even"><td><strong>DFB3</strong></td>
<td>L,C,K</td>
<td>256,512,1024</td>
<td>pulsars</td>
<td>100 microsec</td>
<td>8192, pulsars: 2048</td>
</tr>
<tr class="row-odd"><td><strong>ROACH1</strong></td>
<td>P,L,C,K</td>
<td>128</td>
<td>baseband recorder</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>(varies)</td>
</tr>
<tr class="row-even"><td><strong>DBBC</strong></td>
<td>P,L,C,K</td>
<td>512</td>
<td>VLBI</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
</tr>
</tbody>
</table>
<div class="section" id="total-power">
<h2>Total Power<a class="headerlink" href="#total-power" title="Permalink to this headline"></a></h2>
<p>The Total Power backend is a single-band, seven-beam backend for continuum observations. Located just below the dish, this backend is formed by 14 voltage-to-frequency converters that digitize the incoming RF signals. Different IF inputs can be selected from three focal points. Different bandwidths (maximum bandwidth: 0.1 - 2.1 GHz) and attenuation levels can be selected.</p>
......@@ -301,11 +382,6 @@ XXL5 (for linear) or XXC5 (for circular): 1625–1715 MHz (VLBI band)</div
<td>250,680,1200,2000</td>
<td>1 – 1000</td>
</tr>
<tr class="row-even"><td>L-band</td>
<td>2</td>
<td>2000</td>
<td>1 – 1000</td>
</tr>
</tbody>
</table>
</div>
......@@ -472,13 +548,13 @@ GPU nodes will increase the available bandwidth to 512 MHz.</p>
<p><em>Usage of this backend is admitted in shared-risk mode. Users are required to contact the antenna staff prior to submission, in order to assess the availability of software/hardware services for their specific needs.</em></p>
<p>SARDARA is a backend composed of seven fully-reconfigurable ROACH-2 boards that allow it to perform wide-band spectro-polarimetric observations. The many observing modes covered by SARDARA include: continuum, spectroscopy and spectro-polarimetry. In the future, it will also be able to perform high-time resolution for pulsars and fast transients (not currently available). Its sampling time can be set from 5ms to 1 s. It is the backend of choice for On-The-Fly (OTF) spectro-polarimetric observations.
Available configurations consist of:</p>
<p>** in C and K bands: **</p>
<p><strong>in C and K bands:</strong></p>
<ul class="simple">
<li>420 MHz bandwith with 1024 or 16384 channels</li>
<li>1500 MHz bandwidth with 1024 or 16384 channels</li>
</ul>
<p>SARDARA’s spectral resolution and sensitivity are defined by its full 1500 MHz bandwidth. However only 1200 MHz of the full 1500 MHz bandwidth is usable, since the 1200 MHz filter of the Total Power backend’s Focus Selector is being used as input to SARDARA.</p>
<p>** in L band: **</p>
<p><strong>in L band:</strong></p>
<p>The full bandwidth for this receiver is 500 MHz (1.3-1.8 GHz). RF filters can be used (XXL4, XXL2 etc.) as well as additional backend filters (128, 256 or 460 MHz).</p>
<p>More detailed information on the SARDARA backend can be found here: <a class="reference external" href="https://www.worldscientific.com/doi/full/10.1142/S2251171718500046">SARDARA</a>.</p>
</div>
......
antenna.rst
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View file @ 486bee49
......@@ -76,16 +76,16 @@ Receivers
In the current call for proposals, the following (cryogenically-cooled) receivers are available in both single-dish and VLBI modes:
=============== ============= =============== ================= =============== ===========================================
=============== ============= =============== ================= =============== ================================================
RF band (GHz) Type Tsys@90degEL(K) Beamsize (arcmin) Max gain (K/Jy) connected backends
=============== ============= =============== ================= =============== ===========================================
=============== ============= =============== ================= =============== ================================================
P 0.30-0.36 single-feed 50-80 48 0.52 DBBC,ROACH1
L 1.3-1.8 single-feed 25-35 11.4 0.55 DFB,DBBC,ROACH1,SARDARA
C-high 5.7-7.7 single-feed 32-37 2.7 0.60 TP,DFB,DBBC,ROACH1,SARDARA,XARCOS
K 18-26.5 7-feed 90 0.8 0.45-0.65 TP,DFB,DBBC,ROACH1,SARDARA (MB),XARCOS(MB)
=============== ============= =============== ================= =============== ===========================================
K 18-26.5 7-feed 90 0.8 0.45-0.65 TP (MB),DFB,DBBC,ROACH1,SARDARA (MB),XARCOS(MB)
=============== ============= =============== ================= =============== ================================================
(MB) means that the Multi-Beam option is available for observations in K-band with the XARCOS and SARDARA backends.
(MB) means that the Multi-Beam option is available for observations in K-band with the TP, XARCOS and SARDARA backends.
* The single-feed, L-P band dual-frequency receiver was installed at the primary focus of the telescope, and therefore requires the parabolic configuration. It allows for simultaneous observations at L and P bands. The polarization type is linear but is also transformed to circular thanks to a hybrid converter.
......@@ -134,9 +134,13 @@ For the PPP receiver (P-band), there is one available filter (with code L2XX for
For the LLP (L-band) configuration, the following filters are available for linear or circular polarizations:
XXL1 (for linear) or XXC1 (for circular): all band, 1300--1800 MHz (no filter) (not recommended)
XXL2 (for linear) or XXC2 (for circular): 1320--1780 MHz
XXL3 (for linear) or XXC3 (for circular): 1350--1450 MHz (VLBI band)
XXL4 (for linear) or XXC4 (for circular): 1300--1800 MHz (band-pass)
XXL5 (for linear) or XXC5 (for circular): 1625--1715 MHz (VLBI band)
For simultaneous LP observations, all combinations of the above configurations are allowed.
......@@ -150,6 +154,20 @@ Backends
The frontend (receiver) outputs are connected to the backend instruments either by coaxial cables or optical fibers, depending on whether the backend is located in the main building or below the dish. The following backends, designed for specific scientific activities, are available at the site:
These backends are available for the current call for proposals:
=============== ========= ================== =================== =============== =====================
Backend Bands Bandwidth (MHz) Type Sampling time Max frequency bins
=============== ========= ================== =================== =============== =====================
**Total Power** C,K 250,680,1200,2000 analog/total power 1-1000 ms 1
**XARCOS** C,K 0.5,2.0,7.8,62.5 spectro-polarimeter 10s 2048
**SARDARA** C,K 420, 1500(1200)* spectro-polarimeter down to 5ms 1024 or 16384
**SARDARA** L 128,256,460 spectro-polarimeter down to 5ms 1024 or 16384
**DFB3** L,C,K 256,512,1024 pulsars 100 microsec 8192, pulsars: 2048
**ROACH1** P,L,C,K 128 baseband recorder - (varies)
**DBBC** P,L,C,K 512 VLBI - -
=============== ========= ================== =================== =============== =====================
Total Power
-----------
......@@ -162,7 +180,6 @@ Receiver Sections Filters (MHz) Sampling time (ms)
======== ======== ====================== ==================
K-band 14 250,680,1200,2000 1 -- 1000
C-band 2 250,680,1200,2000 1 -- 1000
L-band 2 2000 1 -- 1000
======== ======== ====================== ==================
XARCOS
......@@ -258,14 +275,14 @@ SARDARA
SARDARA is a backend composed of seven fully-reconfigurable ROACH-2 boards that allow it to perform wide-band spectro-polarimetric observations. The many observing modes covered by SARDARA include: continuum, spectroscopy and spectro-polarimetry. In the future, it will also be able to perform high-time resolution for pulsars and fast transients (not currently available). Its sampling time can be set from 5ms to 1 s. It is the backend of choice for On-The-Fly (OTF) spectro-polarimetric observations.
Available configurations consist of:
** in C and K bands: **
**in C and K bands:**
* 420 MHz bandwith with 1024 or 16384 channels
* 1500 MHz bandwidth with 1024 or 16384 channels
SARDARA's spectral resolution and sensitivity are defined by its full 1500 MHz bandwidth. However only 1200 MHz of the full 1500 MHz bandwidth is usable, since the 1200 MHz filter of the Total Power backend's Focus Selector is being used as input to SARDARA.
** in L band: **
**in L band:**
The full bandwidth for this receiver is 500 MHz (1.3-1.8 GHz). RF filters can be used (XXL4, XXL2 etc.) as well as additional backend filters (128, 256 or 460 MHz).
......
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