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Fri Mar 24 17:07:02 2006

displays yellow text "Comm. Failure" and, perhaps related, Michael is seeing diamchi bounce back to its original position after moves. Temporarily fixed by turning off gonio1 and gonio2 motors

Fri Mar 24 17:05:06 2006

Alec

8-ID-D

Problem

monochromator encoders-gonio2

Moncohromator encoder on gonio2 does not update with moves

Tue Mar 21 10:00:56 2006

Alec

8-ID General

Beamline Hardware

Axis 241Q video server

Password for the root and sandy accounts is the usual I user account password

Quote:

An Axis 241Q video server has been placed on our network. Currently, its IP address is 164.54.116.175 and its host name cymophane (though I have not figured out how to access it via its host name).
There is a link to the video server from the 'Local' section of our web page. Alternatively, use this link: http://164.54.116.175/view/index.shtml
The manual for installation and the user guide are attached below.
Some salient points are as follows:
(1) Basically you just access the web site listed above to connect to the video server
(2) A connection via IE provides additional functionality provided you connect with adminsitrator rights (the first time anyway) so that you can install the MPEG-4 decoder
(3) The MPEG-4 stream uses less bandwidth than the Motion JPEG but does require the decoder
(4) From a Windows PC and MPEG-4, you can save images and zoom the display to full screen
root and sandy are adminstrator login names. The password is available locally

Tue Mar 21 09:59:52 2006

Alec

8-ID-I

Setups

Do Young Noh coherent diffraction

Some misc. notes from Do Young Noh's (DYN) experiment time - March 14--21, 2006

DYN JJ slits should work with bipolar and microstepper drives but found only fully reliable behavior with bipolar drives (SPD-6B's)
Use microns as slit units as don't have enough resolution in spec otherwise with mm units
Did not save all motor settings for the DYN JJ slits, but recall the following:
(1/2 step mode)
48 steps/rev,
gap/aperture = 39.024 microns/revolution
center = 15.485 microns/revolution
ti4 table had to be lowered by approx. 5 mm
Used Newport crossed x-z stage (that we use for Lois Pollack) to support addition beam mask at end of flight path

Fri Mar 17 14:40:59 2006

Alec

8-ID General

Beamline Hardware

Axis 241Q video server

An Axis 241Q video server has been placed on our network. Currently, its IP address is 164.54.116.175 and its host name cymophane (though I have not figured out how to access it via its host name).
There is a link to the video server from the 'Local' section of our web page. Alternatively, use this link: http://164.54.116.175/view/index.shtml
The manual for installation and the user guide are attached below.
Some salient points are as follows:
(1) Basically you just access the web site listed above to connect to the video server
(2) A connection via IE provides additional functionality provided you connect with adminsitrator rights (the first time anyway) so that you can install the MPEG-4 decoder
(3) The MPEG-4 stream uses less bandwidth than the Motion JPEG but does require the decoder
(4) From a Windows PC and MPEG-4, you can save images and zoom the display to full screen
root and sandy are adminstrator login names. The password is available locally (it is the usual I user account password)

Attachment 1: 241X_UM.pdf

Attachment 2: 241X_IG.pdf

Thu Mar 9 10:58:55 2006

Alec

8-ID General

Controls

EPICS and medm on Windows

The download page for Windows: http://www.aps.anl.gov/epics/download/distributions/index.php - you will want the latest version date windows extensions

The Win32 extensions information page:
http://www.aps.anl.gov/epics/distributions/win32/index.php

These require Hummingbird Connectivity as a prerequisite and, if you want to work wirelessly, VPN

Fri Feb 17 17:07:20 2006

Mono beam:
At 6.58 keV, monox = 1.648, monoth = 11.825, te1_x = -38.5509, te1_z = 9.8139

The values of the LVDT (measured using the test box Harold has made) on the te1 optical table motors:
te1xu = 6.730 V, te1xd = 4.504 V
te1zu = 7.704 V, te1zdo = 7.560 V, te1zdi = 6.742 V

To align the station for pink beam (plots can be found in
Log Book #61 (pp. 95-99):

1. open the jjhgap and jjvgap to 5000 each.
2. Drop the pin diode pind1 right after the jj-slits and set raA to 7.
3. umv monox 11.000 (this should move the Ge channel cut out of the beam).
4. umv monoth 8.000
5. te1_x scan from -40 to -30 should show both mono and pink beam on pind1.
6. scan te1_x through the pink beam from -34.000 to -28.000 and set te1_x to CEN.
7. scan monox from 6.5 to 11.0 to see the edge of the Ge mono and set it accordingly.
8. Moving Ge channel cut outboard (monox positive) takes it out of the beam.
9. Flux: With JJ and S4 slits all equal to 50 microns, flux on pind1 was about
3 x 10^12 ph/s.

Fri Feb 17 17:06:16 2006

Alec

8-ID-I

Procedures

Lois procedure (Legacy)

0. Recover after a Beam dump

1. A shutter should open automatically as soon as beam comes back. Check the same
and open the shutter if the shutter does not open automatically.

2. Wait for 45 minutes for the optics to warm up.
Protect the CCD with the Copper/Lead plate.

3. Check flux on pdbs @ att 2 and pdbs_att2
att 2;shutteroff;pdbs_att2;
Flux should be between 60 kHz and 74 kHz at samz = and respectively.
If flux is acceptable, proceed with experiment.

4. If flux is not acceptable, do the following:
{
5. att 15;counters -1 2;plotselect pind2;move_pind2z_in;att 0;shutteroff;
Check flux on pind2. Flux should be in the range of 220 - 240 kHz.
If it is, then S4 slits are fine. We need to check S2 slits.

6. To check S2 slits:
att 15;counters -1 4;plotselect pdbs;move_pind2z_out;att 7;shutteroff;
S2on;lup s2vcen -200 200 40 .1;umv s2vcen CEN;
Perform step 3 to check flux on pdbs.
}

7. If above steps do not restore the flux on pdbs, then do the following:
{

8. S4on;att 15;counters -1 2;plotselect pind2;move_pind2z_in;att 0;shutteroff;
lup s4vcen -100 100 40 0.1;umv s4vcen CEN;
Note: S4vcen may not be reproducible, maximize the counts by tweaking using
"tw s4vcen 5" (in + and - directions till you get the max. counts)
Check flux on pind2 (step 5)

9. If flux is recovered, then
S4off;att 15;counters -1 4;plotselect pdbs;move_pind2z_out;att 7;shutteroff;
Check flux on pdbs (step 3)

After this, if flux on pdbs is still less than what it should be,
perform "step 6".
S2off;

10. Flux should be fine by now.

Note:
(i) lup is the same as dscan.
(ii) To check counts, look at the top visual display or do "ct" in spec and look for
the specific counter.

Fri Feb 17 17:03:36 2006

Data on the bicron scintilator in use at IMM-CAT

Settings on electronics for 7.66 keV:
High Voltage Supply: Ortec 456: 700V
Amplifier: Ortec 590: Settings: fine gain: 0.5 +7 tics
course gain: 20
SCA: Canberra SCA 2030: Settings: Window = 5.20
LL = 2.60

Input pos.
The effective dead time of this setup is around 6 micro-sec, a
more accurate number should be available soon ...

Fri Feb 17 17:02:35 2006

Data on the pin-diode monitors in use at IMM-CAT

We have two different PIN diode types

EG&G VTS3085 (Newark part no 92F3665)

and

EG&G VTS3080 (Newark part no 95F9032)

A PIN diode with an intermediate size (3/8"x3/8") will be available soon:

EG&G VTS3082 (Newark part no 92F3666)

The VTS3085 (around $4) has an active area of 21 mm^2, and approximately
a 1/2 mm dead space around the outer edge. The Max Dark Current is 0.1
micro Amps and the Open Circuit Voltage is .33 V.

The VTS3080 (around $53) has an active area of 392 mm^2 a dark current
of 1.0 micro-amp and an open circuit voltage of .33V.

For both PIN diodes we usually assume that the Si thickness is 400 microns
and that it generates 1 charge pair for each 3.62 eV of deposited
energy. These numbers are not based on manufacturers values but tend to
give approximately correct flux measurements

Some data on the properties of the diode from PerkinElmer Optoelectronics

1.) The diffused junction is on the order of 0.5 microns.
2.) At zero reverse bias the depletion width is approximately 8 to 10
microns.
3.) The bulk material is on the 500 microns thick and has very high
minority carrier lifetimes (i.e. carriers generated deep in the bulk can
be collected by the junction).

Some callibration data on the PIN diodes,

Callibration for 10^6 gain and 10^5 counts/V gives 29537 photons/count at E=7.66 keV
Based on 3.62 eV per charge pair (from amptec manual e.g. ) and assuming 100% absorption.

Callibration for 10^6 gain and 10^5 counts/V gives 87535.7 photons/count at E=23 keV
This is based on a callibrated scatter crossover with the first harmonic.

Fri Feb 17 17:01:56 2006

<PRE>
The photon statistics callibration was done by taking a set of
9 images and comparing the a single image a with the average of
the the nine <a>. Then if photons = C*ADU we have

C0 = <(a-<a>)^2>/<a>^2.

This has to be corrected for the fact that <a> is not a perfect average so
that if N is the number of images in the average

C1 = C0/(1+1/sqrt(N))^2

The RMS dark noise also has to be subtracted, so that if we have M dark images

C2 = C1 - (<(d-<d>>^2/<d>^2)*(1+1/sqrt(N))/(1+1/sqrt(M))

The callibration given was for N=9 and M=3 which is far from optimal and should
probably be done again with more statistics.

Finally, this calculation will not be correct if there is a spread of the
incident photons. For a photon spread of 200 um and a 2.4 to 1 taper
each photon spread over around a 3 pixel square. To correct for this the
images were binned to 1/4 their original size before calculating the RMS
noise.

Note that ADU/Photons = 1/C

Larry Lurio April, 13, 2000

Fri Feb 17 17:00:55 2006

<PRE>

Some data on the McGill's direct detection CCD in use at IMM-CAT

CCD type:
Pixel Array: 576x384
Pixel Size: 22.0 microns square
Full well capacity:
Digitizer: 14 bit/1 Mhz khz and
Serial No:
Absorption Efficiency: Approximately 40% at 7.66 keV
Photon spread:
#(CHECK) Si Conversion ratio: 2.65 eV/photon pair;
#(CHECK) Distance from Be window to CCD chip .543 inches

#(CHECK) ADU Gain: approximately 223 electrons/ADU (slow) and 38.4 fast
#(CHECK) ( had been 330 adu/phot with shallow depletion chip)
Conversion Noise:
Base temperature of Pelletier -40C (With air cooling)

spec settings: set address to 3 (EEV_576x384_3ph) for ccd chip type
(Do this by going to the detectors menu in the spec config editor and
changing the entry under the CCD)

Fri Feb 17 17:00:10 2006

Fri Feb 17 16:59:16 2006

Image Server Setup Info

Some random notes.

1) Make sure that calculations are checked or you won't get the camera
to return images to yorick (img)

2) When choosing the controller type in setup you can't type it into
the text box. You have to use the mouse to scroll down.

More to follow ...

Larry Lurio, June 11, 2004

Fri Feb 17 16:58:22 2006

Facts about Fe55 Source:

Give about 35,000cps (Apr 2003) if nonlabelled side sits on Bicron.
(Note: half life is 8.6150E+07 s, or 2.7 years)
Energy of x-ray is 5.90keV (Mn K-alpha)

Fri Feb 17 16:56:39 2006

Alec

8-ID General

Detectors

PI Direct Detection CCD (not deep depletion)

<PRE>

-MIT direct illumination CCD:

The detector is a Princeton Instruments Direct-Illumination CCD camera
(PI.LCX:1242) manufactered by Roper Scientific, Trenton, NJ.
It contains an EEV Model 37, thermoelectrically cooled CCD chip with a
1152X1242 grid of 22.5 micron wide square pixels.
The quantum efficiency of the detector for 7.66 keV was about 20%.
Readout time between successive full-frame exposures was either 1.6 or
3.2 s, depending on the wether the detector's fast (12 bit) or slow (16 bit)
ADC was used.

june,2001
We have characterised the DI CCD camera using images from Fe3Al (1/2 1/2 1/2)
superlattice peak. We have processed the CCD frame using the droplet algorithm.
we have found that there is 392 ADU's per photon.
There is a spread of the incident photon over 3 pixels.

june,2002
The EEV Model 37 CCD chip was replaced by a new one
We have characterised the DI CCD camera using images from the Aerogel X14.
we have found that there is 392 ADU's per photon.

Attachment 1: ccdanal-jun01.png

Attachment 2: ccdanal-jun02.png

Fri Feb 17 16:53:33 2006

Info on the Oxford Cyberstar X1000 detector electronics and NaI detector head.

Also find attached a doc from CMC-CAT about dead time.

For Undulator A setting of 7.5 keV (best guess of actual photon energy is 7.4 keV):

- HV = 930V
- Gain = 4 (local), 40% (remote) - 0.3 us peak shaping time
- LL = 1 (local), 10 (remote)
- UL = 3.2 (local), 32 (remote)
- Mode = n
- Signal Out -> Scope
- Window Out -> Detector, Correlator, ... use Pulse Research Labs TTL splitter for fan-out

Note: Do not use 300 ns shaping time as it gives spurious spikes and could be because of the TTL line driver we are using. It is better to use 500 ns.

Note: Settings for 3rd harmonic (22keV)
- HV = 930V
- Gain = 2 (local), 20% (remote) - 0.5 us peak shaping time
- LL = 3 (local), 30 (remote)
- UL = 5 (local), 50 (remote)
- Mode = n

Attachment 1: cyberstar_cmccat.pdf

Fri Feb 17 16:50:38 2006

Alec

8-ID General

Detectors

Amptek and pin diode information

Data on the Amptek detector. For detailed information also see the
Amptek web site.

We have two different PIN diode types

EG&G VTS3085 (Newark part no 92F3665)

and

EG&G VTS3080 (Newark part no 95F9032)

A PIN diode with an intermediate size (3/8"x3/8") will be available soon:

EG&G VTS3082 (Newark part no 92F3666)

The VTS3085 (around $4) has an active area of 21 mm^2, and approximately
a 1/2 mm dead space around the outer edge. The Max Dark Current is 0.1
micro Amps and the Open Circuit Voltage is .33 V.

The VTS3080 (around $53) has an active area of 392 mm^2 a dark current
of 1.0 micro-amp and an open circuit voltage of .33V.

For both PIN diodes we usually assume that the Si thickness is 400 microns
and that it generates 1 charge pair for each 3.62 eV of deposited
energy. These numbers are not based on manufacturers values but tend to
give approximately correct flux measurements

Some data on the properties of the diode from PerkinElmer Optoelectronics

1.) The diffused junction is on the order of 0.5 microns.
2.) At zero reverse bias the depletion width is approximately 8 to 10
microns.
3.) The bulk material is on the 500 microns thick and has very high
minority carrier lifetimes (i.e. carriers generated deep in the bulk can
be collected by the junction).

Some callibration data on the PIN diodes,

Callibration for 10^6 gain and 10^5 counts/V gives 29537 photons/count at E=7.66 keV
Based on 3.62 eV per charge pair (from amptec manual e.g. ) and assuming 100% absorption.

Callibration for 10^6 gain and 10^5 counts/V gives 87535.7 photons/count at E=23 keV
This is based on a callibrated scatter crossover with the first harmonic.

Fri Feb 17 15:23:13 2006

Alec

8-ID General

Detectors

PI Direct Detection CCD

Some data on the MIT direct detection CCD in use at IMM-CAT CCD type: Pixel Array: 1152X1242 Pixel Size: 22.5 microns square Full well capacity: Digitizer: 12 bit/1 Mhz 430khz/16bit Serial No: Absorption Efficiency: Approximately 40% at 7.66 keV Photon spread: Si Conversion ratio: 3.65 eV/photon pair; Distance from Be window to CCD chip .543 inches ADU Gain: approximately 223 electrons/ADU (slow) and 38.4 fast ( had been 330 adu/phot with shallow depletion chip) Conversion Noise: Base temperature of Pelletier -40C (With air cooling) spec settings: set address to 1 (EEV_1152x1242_3ph) for ccd chip type (Do this by going to the detectors menu in the spec config editor and changing the entry under the CCD) We have characterised the PI CCD camera using images from the Aerogel X14. we have found that there is 356.3 ADU's per photon in the slow mode and 81.05 in the fast mode. We have characterised the efficiency of the at 6579 eV for the PI CCD This was by comparison with measurements made at UNI-CAT's SAXS setup. The average efficiency is approximately 43% after compensating for the absorption of the kapton window .92 and the absorption of air .70;

Attachment 1: slowCCD.gif

Attachment 2: PI_fast.gif

Attachment 3: PI_eff.gif

Attachment 4: slowCCD.ps

Thu Feb 16 13:53:12 2006

Distances along 8ID-I beamline: COSAXS

Item Distance from Source (mm) Distance to Sample (mm)

Undulator 0
Pinhole aperture 26250 39955
sa1 slit downstream 27220 38985
sa1 slit upstream 27620 38585
Mirror (center) 29190 37015

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