[alma-config]adrian's pad positions
Bryan Butler
bbutler at aoc.nrao.edu
Wed Nov 28 17:27:37 EST 2001
all,
please find appended adrian's pad positions. there is
a PostScript file along with these which graphically
shows the positions, which you can snag from:
http://www.aoc.nrao.edu/~bbutler/adrian.ps.gz
if you wish.
-bryan
simon,
herewith my current pad layout
adrian
...........................................
Adrian Webster,
Institute for Astronomy,
Department of Physics and Astronomy,
University of Edinburgh,
Royal Observatory,
Blackford Hill,
Edinburgh EH9 3HJ,
Scotland.
asw at roe.ac.uk
tel: 0131-668-8391
fax: 0131-668-8416
...........................................
-----Original Message-----
From: Adrian Webster
Sent: Monday, November 26, 2001 14:09
To: 'John Conway'; Adrian Webster
Subject: Possible pad layouts for ALMA
John,
Here are the coordinates of the pads in my current design for the ALMA. The
table gives, on each line, the serial number, x and y coordinates. The
coordinates are in metres E and N of the nominal "centre" at Chajnantor
South, which is the designated
point for the compact part of the array, at (627807.166, 7453228.830) on the
Chilean National Grid, or whatever it is
called. There are 223 pads in all.
The parts of the array are named as follows:-
pads name
1 - 60 central disk
61 - 80 central ellipse
81 - 164 concentric rings of the inverse-square array, to 5
km diameter
165 - 212 Reuleaux triangle (the other 12 pads in the Reuleaux
are reused parts of the above 3 components)
213 - 219 Southern Chascon hybrids
220- 223 North-Eastern Chascon hybrids
These pads have all been checked against Bryan's map and are fine as far as
that goes. Whether they are accessible
by any feasible system of roads is another matter, especially on the eastern
side of the site. The positions of most of the pads are not very critical,
and this includes the Reuleaux triangle, the pads of which are the most
likely to lie in difficult terrain. The electromagnetic properties of thin
rings like the Reuleaux are, in my opinion, very robust against quite
substantial relocations.
Not so, however, the Southern Chascon hybrids. The positions of the
individual pads are not critical, but if it should not prove possible to put
6 - 8 pads somewhere along this E-W line from the eastern edge of the
consecutive rings, running close to the southern boundary of Chascon, the
present hybridization scheme will not work very well and I don't know what
will. This feature seems at the moment to be almost essential. The other
hybrids, to the NE of Chascon, are useful in filling a minor gap that opens
up in the uv-plane at pa 60 degrees when the baselines are of order 10 km,
but are not as essential; probably the best way to run a road to them is
from the Reuleaux, from somewhere near pads 170 - 173 or perhaps pad 208.
I attach some plans and maps that may help.
Please do not use the data I am sending you for any other purpose than
checking out the site.
Please acknowledge safe receipt of this e-mail.
Cheers
Adrian.
1 0 0
2 15 0
3 32 10
4 18 32
5 17 15
6 32 25
7 3 29
8 45 31
9 8 43
10 -10 35
11 -7 50
12 33 40
13 -21 45
14 -36 43
15 6 58
16 -18 60
17 28 54
18 -8 12
19 -25 21
20 -37 -2
21 -22 6
22 -38 13
23 -27 -13
24 -50 22
25 -41 -16
26 -26 -28
27 -40 -33
28 -52 7
29 -29 -43
30 -20 -55
31 -53 -25
32 -43 -47
33 -61 -5
34 -6 -14
35 -5 -34
36 20 -32
37 5 -23
38 8 -41
39 24 -18
40 6 -56
41 35 -29
42 37 -10
43 48 -20
44 20 -50
45 51 -5
46 57 8
47 48 -35
48 62 -15
49 34 -52
50 42 52
51 32 68
52 8 73
53 -12 74
54 -31 67
55 -50 48
56 -35 -60
57 -19 -70
58 35 -67
59 16 -67
60 -6 -76
61 58 44
62 56 65
63 44 82
64 11 90
65 -18 91
66 -3 106
67 17 111
68 37 102
69 58 98
70 51 118
71 62 -47
72 49 -79
73 16 -85
74 -20 -88
75 35 -94
76 56 -99
77 17 -106
78 -4 -106
79 39 -115
80 54 -130
81 106 109
82 139 53
83 139 -44
84 109 -101
85 72 -210
86 162 -164
87 198 -103
88 190 80
89 101 163
90 23 162
91 -15 141
92 -81 27
93 -60 -128
94 13 -200
95 50 233
96 -95 125
97 -133 28
98 -90 -228
99 71 -333
100 206 -287
101 279 -190
102 306 -20
103 241 152
104 163 220
105 -31 290
106 -201 55
107 -220 -163
108 -174 -314
109 -58 -462
110 217 -497
111 427 -244
112 427 42
113 287 271
114 158 327
115 -201 325
116 -343 -128
117 -279 -443
118 -42 -686
119 206 -726
120 511 -562
121 640 -322
122 643 -15
123 527 217
124 282 384
125 42 470
126 -490 105
127 -530 -300
128 -363 -712
129 -125 -950
130 216 -990
131 716 -816
132 962 -347
133 891 192
134 311 486
135 153 700
136 -633 185
137 -784 -506
138 -210 -1395
139 145 -1649
140 883 -1387
141 1319 -887
142 1375 -252
143 1169 312
144 724 629
145 -220 875
146 -1054 26
147 -1197 -498
148 -808 -1736
149 81 -2316
150 946 -2252
151 2105 -1197
152 2081 18
153 1280 820
154 486 1034
155 -435 1240
156 -1713 -347
157 -1641 -1720
158 -546 -3205
159 970 -3887
160 2121 -3467
161 2978 -1998
162 3034 -54
163 2351 883
164 843 1518
165 8704 7383
166 8124 7120
167 7518 6962
168 6911 6568
169 6226 6200
170 5699 5989
171 4908 5516
172 4275 5148
173 4249 4385
174 3563 3202
175 3065 2734
176 2852 2150
177 2509 1440
178 2614 -4440
179 3168 -4923
180 3827 -5029
181 4644 -5476
182 5461 -5555
183 6111 -5893
184 6990 -6028
185 8071 -6212
186 8598 -6291
187 9653 -6554
188 10050 -6300
189 10075 -6300
190 10136 -6265
191 10300 -6300
192 11307 -6260
193 12183 -6159
194 12210 -5292
195 12315 -4503
196 12737 -3924
197 12948 -2846
198 13027 -1742
199 13212 -1032
200 13027 -243
201 13137 543
202 12579 1861
203 12684 2518
204 12236 3149
205 11920 4122
206 11287 4411
207 10259 5121
208 9622 5684
209 9609 5706
210 9549 5741
211 9497 5901
212 9574 6200
213 3780 -1031
214 4560 -1050
215 4597 -2071
216 5958 -2017
217 6974 -2236
218 8244 -2181
219 9006 -1469
220 8647 3832
221 9173 3223
222 9331 2694
223 9620 2218
...........................................
Adrian Webster,
Institute for Astronomy,
Department of Physics and Astronomy,
University of Edinburgh,
Royal Observatory,
Blackford Hill,
Edinburgh EH9 3HJ,
Scotland.
asw at roe.ac.uk
tel: 0131-668-8391
fax: 0131-668-8416
...........................................
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