Data formats

Five data files are generated for each data acquisition with the Mythen detector.

Files with the extensions “raw” and “raw.ff” are comprised of the raw channel and flatfield-corrected channel data. The files with the “parab” extension contain the meta-data. Processed data files include the files with the “xye” and “dat” extensions. All files will be located in the same directory, and should be COPIED by the user to their own storage media.

A number of files are produced during data collection and after processing, below is a description of these.

PARAB File

These files contain meta-data, additional information relating to the experiment. These data include: a time stamp, the data acquisition time, the integrated ion chamber counts, and the 2-theta axis position. Below is an exapmple of the contents of a parab file.

Thu Nov 26 18:46:30 EST 2009
file name root = quartz_ht
run = 11
acquisition time = 60.000 second(s)
mythen gain mode = standard
threshold energy = 7000 eV
SR10BM01ICH01:I_RAW_MON	39935	Ion_Chamber_Raw_Counts
SR10BM01ICH01:RANGE_SP	10pA-0.1uA	Ion_Chamber_Gain
SR11BCM01:CURRENT_MONITOR	185.162	Beam_Current_(mA)
SR10BM01DCM01:KEV_MON	10.0081	Photon_Energy_(keV)
SR10BM01DCM01:UBRAGG_MON	11.3935	Bragg_Axis_Calculated_(deg)
SR10BM01DCM01:BRAGG_MTR_OFFSET_MON	0.038	Bragg_Axis_Offset_(deg)
SR10BM01MIR01:RADIUS_MON	20.834	Collimating_Mirror_Radius_(steps)
SR10BM01MIR02:RADIUS_MON	5.5	Focussing_Mirror_Radius_(km)
SR10BM01HU02IOC01:DIF01_B_MTR.RBV	84.9997	2theta_Mythen_(deg)
SR10BM01HU02IOC01:DIF01_B_MTR.OFF	-44.1254	2theta_Offset_Mythen_(deg)
SR10BM01HU02IOC01:DIF01_Y_MTR.RBV	0.17498	Diffractometer_Height_(mm)
SR10BM01HU02IOC01:DIF01_C_MTR.RBV	7.3104	omega_(deg)
SR10BM01HU02IOC01:SLM01_Yt2.C	0.2	JJ-slit_Vertical_Size_(mm)
SR10BM01HU02IOC01:SLM01_Yt2.D	4.55	JJ-slit_Vertical_Centre_(mm)
SR10BM01HU02IOC01:SLM01_Xt2.C	2	JJ-slit_Horizontal_Size_(mm)
SR10BM01HU02IOC01:SLM01_Xt2.D	6.10623e-16	JJ-slit_Horizontal_Centre_(mm)
SR10BM01HU02IOC01:CS700:GAS_TEMP	0	Cryo_Temperature_(K)
SR10BM01HU02IOC01:ET:RBV_pvTemp	0	Eurotherm_Temperature_(C)
SR10BM01HU02IOC01:FRNC:RBV_pvTemp	610	Furnace_Temperature_(C)
SR10BM01HU02IOC01:FRNC_MTR.RBV	-0.15	Furnace_Stage_Position_(mm)
SR10BM01HU02IOC01:SPN01_INDEX_MTR.VAL	-5.275	Multisample_Spinner_Position
SR10BM01HU02IOC01:scaler1.S8	4.40399e+06	Integrated_Ion_Chamber_Count(counts)
SR10BM01HU02IOC01:scaler1.S16	6.0574e+07	Integration_Time(microseconds)
SR10BM01HU02IOC01:scaler1.S10	0	Integrated_Misc_Counts(counts)

Beamline scientist, Qinfen Gu, has written a program to extract information from parab files. This can be downloaded here.

RAW Files

Contain the raw data in ‘xy’ format, where x = detector channel number and y = counts.

0 47.000000

1 43.000000

2 34.000000

3 31.000000

4 41.000000

5 33.000000

etc…

RAW.FF Files

Contain the flat field corrected raw data in ‘xy’ format, where x = detector channel number and y = corrected counts.

0 37.995037

1 36.822037

2 30.309925

3 28.574492

4 38.199272

5 31.159782

etc…

XY Files

These are your data files, after processing, containing xy data, where x = 2-theta angle and y = corrected counts.

82.818459 37.995037

82.814705 36.822037

82.810951 30.309925

82.807198 28.574492

82.803444 38.199272

82.799683 31.159782

etc…

XYE Files

These are your data files, after processing, containing xye data, where x = 2-theta angle, y = corrected counts, and e = error.

82.818459 37.995037 6.164011

82.814705 36.822037 6.068116

82.810951 30.309925 5.505445

82.807198 28.574492 5.345511

82.803444 38.199272 6.180555

82.799683 31.159782 5.582094

etc…