BL8.0.1.1 iRIXS Operation Manual (Rev 4.0)

-Suggestions? Please email Wanli Yang (WLYang@lbl.gov) - Ver. 2020/07

DISCLAIMER: A synchrotron beamline is NOT something one could operate by just reading through a manual. Anyone operating a synchrotron beamline should have some sort of OJT. Reading this manual does NOT automatically authorize anyone to operate any synchrotron beamline. The purpose of this manual is for providing a reference, a reminder, or a general guideline for users who know what they are doing.

 

iRIXS technical details and references:

iRIXS & htRIXS design: Qiao et al., Review of Scientific Instruments 88, 033106 (2017); doi:10.1063/1.4977592 (PDF)

iRIXS hrRIXS design: Chuang et al., Review of Scientific Instruments 88, 013110 (2017); doi: 10.1063/1.4974356 (PDF)

A downloadable PDF of an old version, Rev 3.0, iRIXS manual is available here!

 

Quick INDEX:

General information:

Beamline refocus mirror setup for iRIXS
- If needed, see beamline software manual here

iRIXS control components

Sample transfer guideline (Reference samples on manipulator)

A Routine Procedure to Start RIXS experiments in iRXIS

Important end-of-run operations

 

Detailed information & parameter settings

Parameters and examples for hrRIXS

Parameters and examples for htRIXS (LE and HE settings)

iRIXS Software (check beamline software manual for XAS software)

htRIXS manual controls and parameter settings

 

iRIXSiRIXS schematic


Beamline setup for iRIXS (typical)

V11 mirror:

H1 switch yard horizontal mirror:

 


iRIXS component locations and definitions

iRIXS endstation
Figure 1: Corresponding motors shown in the iRIXS BCS main control Labview interface.

 


Sample transfer:

Check out video demonstrations of sample transfer:

 


iRIXS Sample Transfer

Note: Do NOT take away the sample holder from beamline after your experiments!
Note: Do not over-tighten(close) the transfer arm collets
Note: Sample holders are of 1 inch diameter, but leave about 2mm edge area for the grabber collets.  See image: attach samples ONLY to the black area or on the round plate if used.

iRIXS Sample Holder

 

 

Reference samples on iRIXS manipulator:

iRIXS reference Samples
Update: Fe3O4 is replaced by Au (top) & CdS (below) films as of April 2016

 

A Routine Procedure to Start RIXS experiments in iRXIS:

 

Important End-of-run Operations!!


Below is the operation parameters (only italic bold values are regularly changed/checked):

(NOTE: If you don’t know which spectrograph you are using, you are using the hrRIXS!)

High-resolution RIXS (hr-RIXS) spectrograph

Note: 0th order peak width adjustment is no longer needed in most cases, only optional as of 2020/07. The "laser position" should get decent resolution already.

Experimental (1st order) positions:

Spectrometer Rotation angle determines the energy window on the detector. Below are typical energy ranges:

[Optional] 0th order alignment positions (centered on CCD):

Note: A focused 0th order peak width is about 4-5 pixels.

 

High-throughput RIXS (ht-RIXS) spectrograph
(do NOT touch any spectrometer strut!)

Note: for htRIXS, once see signal peak on CCD (parameters below), move Y-axis slowly to optimize the intensity/sharpness of elastic peak and/or signals!

Low Energy Optics:
LEG LVDT reading: 40000-54400  (manual adjustment, Figure 2)
LEM LVDT reading: 33400 (Do NOT change)
0th order: CCD Arm Angle (angle meter): about 24 degree
1st order: CCD Arm Angle (angle meter): about 20.8 degree - this is indicated by the dialer underneath.
Front Aperture LMT position: ~27-29 (for blocking visible light) - see the htRIXS-2 on manual controls in the htRIXS operation below.

[Examples] Arm all the way down, Dialer at ~1.9” LEG=54400 for Si-L edges;
Dailer at ~1.9" LEG=40000, for ~140 eV.
Dialer at ~1.13" LEG=40100, for S-L ~160-200 eV.
(This is about half inch (12mm) rise of the bottom of the CCD arm at the front edge)


Sample position for LE settings is typically towards the Y of "laser position"+ 1 to 3mm.

a typical dailer reading of LE of htRIXS htRIXS LE a typical aperture position

High Energy Optics:
HEG LVDT reading: 27500 (manual adjustment, Figure 2)
HEM LVDT reading: 20000 (Do NOT change! Experienced user ONLY)
1st order:  CCD arm angle (angle meter): about 21 degree
0th order: CCD arm angle (angle miter): about 22.8 degree
                    (CCD arm Dialer 0.406”; 0th order peak centered around # 1034.7 pixel)
Front Aperture LMT position: ~25 (for blocking visible light) - see the htRIXS-2 on manual controls in the htRIXS operation below.

[Examples] CCD arm Dialer at ~1.26”, HEG=27580, O-K to Ni-L in the same energy window; Dailer ~1.1675 for Mn-L iPFY.

Sample position for HE settings is typically towards the Y of "laser position"+ 7 to 11mm.
- Please watch the manipulator and do not move Z for a long distance at this position as it may crash the manipulator!!

htRIXS HE a typical dialer reading htRIXS HE a typical aperture position

Spectrometer Operation Software (both htRIXS & hrRIXS)

Update: As of “May the Fourth (be with you)” 2017, the ALS Labview software package is implemented for general users.
- The Andor Solis camera software from Andor is for troubleshooting only

Operation Procedures of the ALS Labview control software:

iRIXS main interface

iRIXS subsystem

iRIXS CCD cooling

iRIXS scan setup

Note: Try not to turn on the CCD until the temperature is low, except for occasional checking. If the CCD shows high background when it is cooled down, it may need to be warm up and cooled down again.

CCD

 


High-throughput RIXS (ht-RIXS)

 

htRIXS-1: LVDT software control and readings:

Note: For general users, the ONLY use of the LVDT software below is to watch the grating angles (Channel 3), which is needed for switching between low-E and high-E.

iRIXS htRIXS VPB

Note: In order to display the LVDT readings on the main VPB panel, motor motion has to be stopped by clicking the lightning button again!

 

[General Info] Motorized controls of htRIXS as of 2020/06 (motorization of the CCD rotation is in process):

 

htRIXS-2: Manual controls

Manual control definition on the optical lid of ht-RIXS:

htRIXS manual control components

Figure 2: Manual adjustments of the optics in ht-RIXS spectrograph

 

htRIXS-3: Andor CCD arm rotation (for selecting emission energy window)

htRIXS manual angle indicator dialer


As of 2016/03/02, the CCD arm rotation of htRIXS spectrograph is operated through the hand drill, and the dial indicator touching the bottom of the Dialer (see image above)
Important NOTE: No-body touches the dial indicator! Otherwise, all the numbers for the focusing position bellow needs to be recalibrated and reset!

 

MISC:

MISC-1: Guideline of RIXS data processing into full energy range mapping of RIXS (mRIXS)

Reference on Mapping of RIXS (mRIXS) data process: Wu et al., J. Vis. Exp. (134), e57415 (2018); doi: 10.3791/57415 (PDF)

MISC-2: Sample positioning using iRIXS alignment lasers