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[[Category:Equipment]]
[[Category:Equipment]]
HacDC is in the process of refurbishing a scanning electron microscope: a Cambridge Stereoscan 200.
HacDC is in the process of refurbishing a scanning electron microscope: a Cambridge Stereoscan 200.


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=Current Status=
=Current Status=


March 31st: Cleaned the plinth and took photographs of the vacuum components. [https://dl.dropboxusercontent.com/u/45972/sem/sem_cleaning/index.html Available here]. -Dan K.
Roughing pump works, turbo spins up to full speed for a while but then slows down. The vacuum controls operate but don't light up as expected, and the pressure readout is not showing a reading. The console turns on and produces video output with the correct data overlay. The filament control reads "bad filament," despite the filament continuity being OK. There is an interlock between the pressure gauge and console that may be keeping the filament off. We'll need to verify the pressure gauge output and see how to trigger that interlock.  


* <strike>Oil diffusion</strike>Turbo molecular pump was hanging due to the lip falling out of the rubber suspension. Could be cleaned and probably popped back in.
We received and installed an MKS Micropiriani 925 vacuum gauge that measures vacuum up to atmosphere. After pumping down, we bottom out at .34 torr. There is a gross leak in the tube on the side of the machine. we are now reverse engineering the electronics. we have replaced the seals on the up-tube, and are working on controlling the column with a microcontroller, rather than the giant desk-sized console.


* Broken switch on roughing pump was bypassed internally. Plugging in the outlet should activate the pump. (This pump normally runs 24/7 when the machine is operational.)
See [[Stereoscan_Operators_Log]] for details.


* Compressed air needed to get more dust out
=Documentation=
* A suspected leak between the main imaging chamber and the top of the electron gun cylinder is preventing the chamber from reaching pressures low enough to sustain a proper beam. The plumbing connecting the two consists of two elbow brackets. The top and bottom of the long elbow bracket use 2-1/4" diameter black rubber (Viton?) gaskets/O-rings. The bottom elbow bracket uses a 2-3/4" gasket to couple to the chamber proper, and has an adapter between 2-3/8" and the 2-1/4" at the bottom of the long elbow bracket. These are compression-style fittings; the rubber is compressed between two metal pieces and completes the seal.


March 30th: Moving complete! The SEM is now in the workshop
[Image of Vacuum Bracket](https://i.imgur.com/3k8zrL5.png)


March 29th: Awaiting pick-up and installation (March 29th and 30th).
== Manuals and Images ==
* the web archive's copy of RIT's [[https://web.archive.org/web/20050221031305/www.rit.edu/~bekpph/sem/S200.html|Stereoscan 200 Operating Instructions]]
* [[:File:Stereoscan_200_Operating_Instructions.pdf|Stereoscan 200 Operating Instructions]]
* [[:File:Stereoscan_Student_Guide.pdf|Stereoscan Student Guide]]
* Vacuum gauge: Edwards Penning CP25-k: http://www.idealvac.com/files/manuals/Edwards_CP25K_Cold_Cathode_Gauge_Sensor_Manual.pdf
* [https://www.mksinst.com/Docs/R/925man-revh.pdf 925 MicroPirani (TM) Vacuum Pressure Transducer RS232 / 485 / Display Operation and Installation Manual]
* Roughing Pump: Edwards E2M-12 255 LPM two stage oil filled rotating vane pump [[File:Edwards_E2M2_to_E2M12_Users_Instruction_Manual.pdf]]
* Turbo Pump: Pfeiffer Balzers TPH 190
:[[:File:Balzers_TPU-TPH_170.pdf|Pfeiffer Balzers TPU TPH 170 manual]]
:Similar but smaller unit manual [[File:Pfeiffer_Balzers_TPH_TPU_110_.pdf]]
:Table of pumps to compatible controllers [[File:Pfeiffer_table.pdf]]
::View of pump 1 [[Media:PfeifferTHP190_1.gif]]
::View of pump 2 (connector side) [[Media:PfeifferTHP190_2.gif]]
::View of pump 3 (other side) [[Media:PfeifferTHP190_3.gif]]
* Turbo Pump Controller: [[:File:Pfeiffer_Balzers_TCP-300_Controller.pdf|Pfeiffer Balzers TCP 300 Controller]]


March 23rd: A space in the workshop has been cleared. Photo: http://i.imgur.com/BDNWL5z.jpg
== Original ==


=Maintenance Information=
* [http://i.imgur.com/rMErvPd.png Stereoscan 200 dimensions]


Maintenance and repair logs will be kept on an ongoing basis. For previous status and repairs, see:
* [https://dl.dropboxusercontent.com/u/45972/sem/s200.zip S200 operating instructions (2 MB zip)]


# http://757labs.org/2012/09/scanning-electron-microscope-update/ ([http://pastebin.com/hSiu4Urs archival link -- text only])
* [http://www.idealvac.com/files/ManualsII/Edwards_E2M2_to_E2M12_Users_Instruction_Manual.pdf Edwards E2M-12 roughing pump user instruction manual]


# http://757labs.org/wiki/Projects/SEM ([http://pastebin.com/vWPj8eHu archival link -- text only])
==757 Labs==


=Useful information=
Previous owners (757 Labs, another hackerspace) attempting repairs compiled some information at:


* [http://i.imgur.com/rMErvPd.png Stereoscan 200 dimensions]
* http://757labs.org/2012/09/scanning-electron-microscope-update/ ([http://pastebin.com/hSiu4Urs archival link -- text only]) ([https://web.archive.org/web/20140401150504/http://757labs.org/wiki/Projects/SEM Internet Archive])


* [https://dl.dropboxusercontent.com/u/45972/sem/s200.zip S200 operating instructions (2 MB zip)]
* http://757labs.org/wiki/Projects/SEM ([http://pastebin.com/vWPj8eHu archival link -- text only])


=Resources=
==Additional Resources==


* The original S200 operating instructions will be available at the space in a three-ring binder near the machine.  
* The original S200 operating instructions are available at the space in a three-ring binder near the machine.  


* If possible, members will also have access to a PDF copy of ''Scanning Electron Microscopy - A Student's Handbook'', 1980, self-published by Michael Postek, et al. This book was widely used by microscopists and is still regarded as a good learning reference, but the original binding is rare and prone to falling apart. It might be possible to use the PDF copy for private, educational use.
* If possible, members will also have access to a PDF copy of ''Scanning Electron Microscopy - A Student's Handbook'', 1980, self-published by Michael Postek, et al. This book was widely used by microscopists and is still regarded as a good learning reference, but the original binding is rare and prone to falling apart. It might be possible to use the PDF copy for private, educational use.


* SPI supplies: http://www.2spi.com
==More Photos==


* O-ring supplier: [http://www.parker.com/portal/site/PARKER/menuitem.7100150cebe5bbc2d6806710237ad1ca/?vgnextoid=f5c9b5bbec622110VgnVCM10000032a71dacRCRD&vgnextfmt=default&vgnextcatid=7394760&vgnextcat=O-RING%20PRODUCTS%20-%20NORTH%20AMERICA&Wtky=O-RINGS http://www.parker.com]
* [https://dl.dropboxusercontent.com/u/45972/sem/sem_install/index.html SEM install and overview]


=Contacts=
* [http://imgur.com/a/uR7Yv#0 Close-ups of assembly and components]


We'll have a list here of HacDC members who are responsible for the SEM, including people that should be notified about problems.
* [https://dl.dropboxusercontent.com/u/45972/sem/sem_cleaning/index.html Cleaning and vacuum components]


=Contacts=


=Supplies wishlist=
We have a list here of HacDC members who are responsible for the SEM, including people that should be notified about problems.
 
* Apiezon M vacuum grease for "O" rings, to be used for vacuum seals at room temperature: http://www.2spi.com/catalog/vac/apiezon/apiezon-m.php ($70 for 25g). Edit: page 058 of the manual states "The use of O ring grease is not recommended on any O rings, but a small amount may be used, if necessary, on moving seals e.g. the specimen stage and apereture changer micrometers."
** 31Mar2014 - there's a syringe of Ap. T grease in the space (~2g).  It's on top of the SEM's chamber atm.
 
* Replacement "O" ring for chamber->gun vacuum tube, for the chamber-side mounting adapter. (Will this work?  http://www.grainger.com/product/O-Ring-1RHY8)
 
=More Photos=


* http://imgur.com/a/uR7Yv#0
[[User:Mirage335|Mirage335]] ([[User talk:Mirage335|talk]]) Custom electronic control replacement circuitry.


* https://dl.dropboxusercontent.com/u/45972/sem/sem_install/index.html
[[User:Juri|Juri_]] Julia Longtin, Juri_ on IRC. SEM repair project.

Latest revision as of 10:50, 26 August 2018

HacDC is in the process of refurbishing a scanning electron microscope: a Cambridge Stereoscan 200.

SEM in workshop

Current Status

Roughing pump works, turbo spins up to full speed for a while but then slows down. The vacuum controls operate but don't light up as expected, and the pressure readout is not showing a reading. The console turns on and produces video output with the correct data overlay. The filament control reads "bad filament," despite the filament continuity being OK. There is an interlock between the pressure gauge and console that may be keeping the filament off. We'll need to verify the pressure gauge output and see how to trigger that interlock.

We received and installed an MKS Micropiriani 925 vacuum gauge that measures vacuum up to atmosphere. After pumping down, we bottom out at .34 torr. There is a gross leak in the tube on the side of the machine. we are now reverse engineering the electronics. we have replaced the seals on the up-tube, and are working on controlling the column with a microcontroller, rather than the giant desk-sized console.

See Stereoscan_Operators_Log for details.

Documentation

  • A suspected leak between the main imaging chamber and the top of the electron gun cylinder is preventing the chamber from reaching pressures low enough to sustain a proper beam. The plumbing connecting the two consists of two elbow brackets. The top and bottom of the long elbow bracket use 2-1/4" diameter black rubber (Viton?) gaskets/O-rings. The bottom elbow bracket uses a 2-3/4" gasket to couple to the chamber proper, and has an adapter between 2-3/8" and the 2-1/4" at the bottom of the long elbow bracket. These are compression-style fittings; the rubber is compressed between two metal pieces and completes the seal.

[Image of Vacuum Bracket](https://i.imgur.com/3k8zrL5.png)

Manuals and Images

Pfeiffer Balzers TPU TPH 170 manual
Similar but smaller unit manual File:Pfeiffer Balzers TPH TPU 110 .pdf
Table of pumps to compatible controllers File:Pfeiffer table.pdf
View of pump 1 Media:PfeifferTHP190_1.gif
View of pump 2 (connector side) Media:PfeifferTHP190_2.gif
View of pump 3 (other side) Media:PfeifferTHP190_3.gif

Original

757 Labs

Previous owners (757 Labs, another hackerspace) attempting repairs compiled some information at:

Additional Resources

  • The original S200 operating instructions are available at the space in a three-ring binder near the machine.
  • If possible, members will also have access to a PDF copy of Scanning Electron Microscopy - A Student's Handbook, 1980, self-published by Michael Postek, et al. This book was widely used by microscopists and is still regarded as a good learning reference, but the original binding is rare and prone to falling apart. It might be possible to use the PDF copy for private, educational use.

More Photos

Contacts

We have a list here of HacDC members who are responsible for the SEM, including people that should be notified about problems.

Mirage335 (talk) Custom electronic control replacement circuitry.

Juri_ Julia Longtin, Juri_ on IRC. SEM repair project.

Pages in category "Stereoscan"

The following 3 pages are in this category, out of 3 total.