Spectrometer Characteristics
On the ID16 beamline are operating two different spectrometers with different characteristics that share the same sample goniometer. The two spectrometers can not be utilized simultaneously and one of the two have to be taken apart.
Horizontal Arm
The spectrometer consists of a 7-meter arm rotating in the horizontal plane and equipped with five spherical crystal analysers. With this spectrometer we have the capability to record spectra at five momentum transfers simultaneously.
Table below summarises the main characteristics of the ID16 beamline with this spectrometer.
| Reflection | Energy [keV] |
[meV] |
Qmax [nm-1] |
Qmin [nm-1] |
[nm-1] |
Flux [ph./s/200 mA] |
|---|---|---|---|---|---|---|
| Si(7,7,7) | 13.840 | 7.6 ± .2 | 21.32 | 1 | 1 | 1.0 .1011 |
| Si(8,8,8) | 15.817 | 5.5 ± .2 | 24.4 | 1 | 1.07 |
4.1010 |
| Si(9,9,9) | 17.794 | 3.0 ± .2 | 27.4 | 1 | 1.2 |
2.1010 |
| Si(11,11,11) | 21.747 | 1.5 ± .1 | 33.5 | 1 | 1.47 |
4.109 |
| Si(12,12,12) | 23.725 | 1.3 ± .1 | 36.5 | 1 | 1.6 |
5.109 |
| Si(13,13,13) | 25.704 | 1.0 ± .1 | 39.6 | 1 | 1.75 | 9.108 |
Energy indicate the photon incident energy; E is the total energy resolution; Qmax and Qmin indicate the maximum and minimum measurable momentum transfer;
Q indicates the Q-spacing between adjacent analysers; the Photon Flux values are measured at the sample goniometer with the following experimental conditions: three 1.6 m U35 undulators; ring current: 200 mA; primary slits aperture: 1.6 mm (horizontal) x 0.6 mm (vertical); secondary slits aperture: completely open.
The Qmin depends strongly from the beam divergence (40 rad hor. x 20
rad ver.) and from the aperture of the slits in front of the first analyser.
Vertical Arm
The spectrometer consists of a 3-meter arm rotating in the vertical plane and equipped with only one spherical crystal analyser. This spectrometer allows to reach much high momentum transfer respect the horizontal spectrometer.
Table below summarises the main characteristics of the ID16 beamline with this spectrometer.
| Reflection | Energy [keV] |
[meV] |
Qmax [nm-1] |
Qmin [nm-1] |
Flux [ph./s/200 mA] |
|---|---|---|---|---|---|
| Si(7,7,7) | 13.840 | 8 |
124 | 1 | 1.0 .1011 |
| Si(8,8,8) | 15.817 | 7 |
142 | 1 | 7.6.1010 |
| Si(9,9,9) | 17.794 | 4.5 |
160 | 1 | 2.4.1010 |
Energy indicate the photon incident energy; E is the total energy resolution; Qmax and Qmin indicate the maximum and minimum measurable momentum transfer; the Photon Flux values are measured at the sample goniometer with the following experimental conditions: three 1.6 m U35 undulators; ring current: 200 mA; primary slits aperture: 1.6 mm (horizontal) x 0.6 mm (vertical); secondary slits aperture: completely open.
With the 3-m spectrometer the geometrical contribution to the E are relevant therefore the energy resolution improve by shortening the distance between sample and detector chamber. The momentum transfer resolution is set by motorized slits in front of the crystal analyser.
The Qmin depends strongly from the beam divergence (40 rad hor. x 20
rad ver.) and from the aperture of the slits in front of the first analyser.
The focal spot size at the sample is 250 m hor. x 150
m ver using the toroidal mirror
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