The Use and Calibration of the Kern ME5000 Mekometer - SLAC ...

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I -- - : 1.3. Scale error ME5000 Test Measurements Scale error is due to an error in the frequency of modulation of the carrier beam. Determination of the error therefore consists in measuring the emitted Bequency and comparing this against the frequency the instrument thinks it is using. The method used to do this is described below in Section 4 on Frequency Measurements. Three series of test measurements were conducted in order to evaluate the behavior of each instrument: baseline measurements, interferometer measurements and frequency measurements. These tests am described below. 2.1. The SLAC Baseline 2. BASELINE MEASUREMENTS The SLAC baseline was constructed in mid-1985 along the south side of the Linac. Twenty pillars (BOl - B20) were erected (Table 2). The baseline runs nearly due east-west from BOl in the west at Sector O-O above the Linac injector to B20 in the east at Sector 21-2. Each pillar is a 1-ft diameter reinforced concrete post, poured in situ, that protrudes 3 ft above ground and descends 4 ft beneath ground. Each pillar is topped with a CERN socket. Most of the pillars are on the grass verge beside the access road. The linac slopes downward from the west end at a slope of approximately 0.005 (0.3”). The intention was to set out the baseline in such a manner that the CERN sockets atop the pillars follow a geometrical straight line rather than the earth’s curved surface, and that this line have the same slope as the linac. The elevation for each socket was calculated by applying a curvature correction working outwards from B02, the $llar closest to the midpoint of the line, and using a slope of 0.00498382. However, this design was not finally achieved. Since it was found that the design location of B02 would place the pillar in a parking area, B02 was actually installed 10m closer to B03. New curvature corrections were not calculated, but the resultant error is minor (see Table 6). TABLE 2. The spacing of pillars on the SLAC baseline Pilh BOl B02 B03 B04 B05 B06 B07 B08 B09 BlO Bll B12 B13 B14 B15 B16 B17 B18 B19 B20 Distaace from BOl (m) 950 1480 1510 1530 1570 1620 1670 1720 1770 1790 1840 1880 1930 1960 1990 2040 2090 2100 2140 Distance to next pillar (m) 950 530 30 20 40 50 50 50 50 20 50 40 50 30 30 50 50 10 40 Of the twenty pillars, only eleven are used for EDM calibrations (Table 3). The spacing of these pillars is such as to provide a broad range of distances with no duplication (Table 4). 18
-- From B14 B19 B03 B17 BlO B15 B12 B17 B14 B12 B15 BiO B14 B15 BlO B12 B14 BO5 B12 To Distance B15 30 B20 40 B05 50 B19 60 B12 70 B17 80 B14 90 B20 100 B17 110 B15 120 B19 140 B14 160 B19 170 B20 180 B15 190 B17 200 B20 210 BlO 240 B19 260 ME5000 Test’iUea.&rements TABLE 3. The pillars usedfor WiU baseline calibrations TABLE 4. The distances measured in WM baseline calibrations From BlO B03 B12 B05 BlO B03 BlO BO5 B05 B03 B03 BO5 B02 B03 BO5 B02 B05 B03 To Distance B17 270 BlO 290 B20 300 B12 310 B19 330 B12 360 B20 370 B14 400 B15 430 B14 450 B15 480 B17 510 B03 530 B17 560 B19 570 B05 580 B20 610 B19 620 From B03 B02 B02 BOl B02 B02 B02 B02 B02 BOl BOl BOl BOl BOl BOl BOl BOl BOl To Distance B20 660 BlO 820 B12 890 B02 950 B14 980 B15 1010 B17 1090 B19 1150 B20 1190 B03 1480 BO5 1530 BlO 1770 B12 1840 B14 1930 B15 1960 B17 2040 B19 2100 B20 2140 The other nine pillars of the baseline were included to allow distinvar measurement of most of the baseline. 50 m is the longest practical distance that can be measured with invar wire and the distinvar. With these nine auxilliary pillars,- the 660 m from B03 to B20 can be measured with 10,20,30,40 and 50 meter wires. This ability to measure the baseline with invar wires was important for detecting any scale difference between the invar wires used for measuring distances in the accelerator housings and the DM503 used for measuring the geodetic network on the surface. For two reasons this comparison against invar wires is not necessary for the ME5000. Firstly, the ME5000 can be used both on the surface network and in the tunnels. Secondly, the scale of the ME5000 can be determined much more easily by means of a frequency calibration. Located alongside a busy access road the baseline has received some damage in its seven years. One of the distinvar pillars, B07, was destroyed by a garbage truck in late 1985. Because this pillar was on a paved road rather than on the grass verge like most of the other pillars, it was not rebuilt. Instead, a concrete pad was poured, flush with the road surface. This pad has three holes drilled so a tunnel tripod can be mounted and a CERN socket plumbed over a target set in the concrete. More seriously, one of the EDM pillars, B20, received a major blow from a Pettibone forklift that moved the pillar about 5 cm. 19
Page 1 and 2: Proceedings of the Workshop on The
Page 3 and 4: -- : CONTENTS Participants ........
Page 5 and 6: Argonne National Laboratory 9700 So
Page 7 and 8: I -- : ME5000 OPERATION Bernard Bel
Page 9 and 10: -- The second and third approaches
Page 11 and 12: : - _ ml = Anti co D mr+l = 2Fune D
Page 13 and 14: : iUE5LH.W Operation The precise fr
Page 15: -- - ME5000 TEST MEASUREMENTS Berna
Page 19 and 20: -- : ME5000 Test Measurements was r
Page 21 and 22: : ME5000 Test Measurements 4.1. MEK
Page 23 and 24: - 1 MEso Test ~Measurements this op
Page 25 and 26: . -- ME5000 DATA REDUCTION Bernard
Page 27 and 28: : ME5000 Data Reductions The ME5000
Page 29 and 30: Ds = Dm$ + K1 + K2 M~xnJv +a K.eauc
Page 31 and 32: : ME5000 Data Reductions without th
Page 33 and 34: -- - kiE5000 Data Reductions e) Ell
Page 35 and 36: -- . - ._ ME5000 Data Redtktions ME
Page 37 and 38: . . VARIANCE COMPONENT ANALYSIS OF
Page 39 and 40: 2.1. The Mathematical model Varianc
Page 41 and 42: . -- r*D-‘r “2,-- - 0 o- n-u G-
Page 43 and 44: . - Variance Component Analysis (:)
Page 45 and 46: -- Variance C&nj3ont+zt Analysis AP
Page 47 and 48: 1 1 1 1 1 1 2 2 2 2 2 3 3 3 3 4 4 -
Page 49 and 50: . 1.1. The Characteristic Curve . M
Page 51 and 52: ME5000 Results has been made. The r
Page 53 and 54: -- 4.00 367037 LBL 3.00 l@Q mA II .
Page 55 and 56: I : ME5000 Results TABLE 6 [cont.]
Page 57 and 58: I I I.“.” , ME5000 Results Tabl
Page 59 and 60: TASLE 8 [coni.] FROM TO DISTCm) RES
Page 61 and 62: -- - : =s ’ Mi?Z5&IQ Risults 23.2
Page 63 and 64: -- * 100 . E I ,:\. r\/ ’ ’ ME5
Page 65 and 66: -- CALIBhiTION AND USE OF +lXE MEKO
Page 67 and 68:
-- . - : Use of the ME5000 on the C
Page 69 and 70:
-- : Use of the ME5000 on the Chann
Page 71 and 72:
w Figure 1. The RTM Network 73 I \
Page 73 and 74:
-- _. 1 7 a 9 10 11 12 13 14 AUX PP
Page 75 and 76:
I -- - : PP190 AUX DCAS DHILL H E F
Page 77 and 78:
17 18 19 20 21 22 23 24 25 26 27 28
Page 79 and 80:
TM3 TM3 TM9 E TM4 CHl TM8 E TM2 TM8
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