Column list from TEMPERATURE SCANS as of Jan. 30,2003
Scattering angle – Q relation and angular spacing of analysers
High Resolution Si(h h h ) monochromator and useful conversions

 

Column list from TEMPERATURE SCANS as of Jan. 30,2003

 

 

Col# Counter name Counter meaning Inv.#
1 Temperature monot setpoint -40
2 H   -39
3 K   -38
4 L   -37
5 Epoch   -36
6 sec integration time -35
7 pindiode   -34
8 izero OH2 pmoni -33
9 izero EH1 izero (mon. after ML) -32
10 Ione/Izero   -31
11 Sec   -30
12 Prema_ad5 NTC mono in ohm -29
13 Prema_ad6 NTC analyzer #1 -28
14 Prema_ad7 NTC analyzer #2 -27
15 Prema_ad8 NTC analyzer #3 -26
16 Prema_ad9 NTC analyzer #4 -25
17 Prema_ad10 NTC analyzer #5 -24
18 Prema_ad11 NTC analyzer #6 -23
19 Prema_ad12 NTC analyzer #7 -22
20 Prema_ad13 NTC analyzer #8 -21
21 Prema_ad14 NTC analyzer #9 -20
22 Prema_ad16 NTC EH1 -19
23 pico   -18
24 deta1   -17
25 deta2   -16
26 deta3   -15
27 deta4   -14
28 deta5   -13
29 SR current   -12
30 NTC_mono mono temp. in degreeC -11
31 Cryostat T2 (sample) in displex -10
32 newdet S(Q)-det near Ana2 -9
33 prema_ad15 PT100 chamber 7m -8
34 ione monitor after slits -7
35 detsq S(Q) near sample -6
36 deta6   -5
37 deta7   -4
38 deta8   -3
39 deta9   -2
40 Imirr monitor before ML -1

 

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Scattering angle – Q relation and angular spacing of analysers

 

Si(8 8 8)

Q [nm-1] = 4pi/lambda * sin(2theta/2) = 160.3 nm-1 *sin(2theta/2)

2theta (10 nm-1) = 7.153° lambda = 0.7839 Å E = 15.816 keV

 

Analyzer No° tth [°]
1 8.730°
2 7.153°
3 5.645°
4 4.095°
5 2.527°

 

Si(9 9 9)

Q = 180.35 * sin(2theta/2)

2theta (10 nm-1) = 6.357° lambda = 0.6968 Å E = 17.794 keV

 

Analyzer No° tth [°]
1 7.934°
2 6.357°
3 4.849°
4 3.299°
5 1.731°

 

Si(11 11 11)

Q = 220.414 * sin(2theta/2)

2theta (10 nm-1) = 5.200° lambda = 0.5701 Å E = 21.7477 keV

 

Analyzer No° tth [°]
1 6.777°
2 5.200°
3 3.692°
4 2.142°
5 0.574°

 

Relative tth between analyzers

 

  #2 #3 #4 #5
#1 -1.577° 3.085° 4.635° 6.203°
#2   1.508° 3.058° 4.626°
#3     1.550° 3.118°
#4       1.568°

 

Maximum momentum transfer and “Q-spacing”

Energy[keV] Reflection order n Qmax (7 m)[nm-1] deltaQ (7 m) [nm-1] Qmax (12 m)[nm-1] deltaQ (12 m)[nm-1]
13.840 7 64 1.89 30.3 1.89
15.817 8 74 2.16 35 2.16
17.794 9 83 2.43 39 2.43
21.747 11 101 3.00 47 3.00
23.725 12 111 3.24 52 3.24
25.704 13 120 3.50 56 3.50

 

Maximum momentum transfer, Qmax, for the 7- and 12-meter section of the spectrometer arm. deltaQ indicates the Q-spacing between adjacent analysers. If the two sections are utilised simultaneously, The Q-spacing is reduced to half of the indicated value.

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High Resolution Si(h h h ) monochromator and useful conversions

 

 

Reflection (7 7 7) (8 8 8) (9 9 9) (11 11 11) (12 12 12) (13 13 13)
Wavelength
-1]
0.895886 0.7839003 0.6968003 0.5701093 0.52260096 0.48240018
Energy
[eV]
13839.35 15816.40 17793.45 21747.556 23724.572 25701.6568
Conversion
meV -> K
0.02822 0.02470 0.02195 0.01796 0.01646 0.01520
delta(E)M [meV] 5.3 4.4 2.2 1.02 0.73 0.5
(deltaE/E)M 3.8*10-7 2.8*10-7 1.2*10-7 4.7*10-8 3.0*10-8 2.0*10-8
Conversion angles -> nm-1 140.265 160.306 180.344 220.424 240.459 260.497
QMax-1]
(for 7m arm)
5.93 6.77 7.62 9.32 10.16 11.00
Flux
[ph/s 200 mA]
7*1010 6*1010 1.8*1010 4.4*1010 3.9*1010 9.8*1010

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