[Sem] Column Liner

[Chris Murphy]

It took about 30 minutes for the operation light to come on. At 20x,  
the image was partially occluded by a misaligned aperture or perhaps  
dust in the aperture. The objective aperture is still dirty. (we  
reused it from the old column.)

As we increased resolution, astigmatism was fairly bad in 'search-TV'  
mode. The X-Y stigmator was of no use. Later on, I noticed in the  
manual that we did not perfectly follow operating procedures.  
Regardless, I'm guessing that we need to clean the objective aperture  
with a blow torch.

In 'photo' mode, astigmatism was noticeably improved but still  
present. We photographed some images of the round contacts of a  
semiconductor at about 500x. Grid lines on the chip were distorted  
(pincushion) when they should have been straight, crossing at right  
angles.

It would be interesting to measure the aperture's diameter, perhaps  
with a laser, etc. The manual states that it can be outfitted with  
either a 200 or 300 micron objective aperture.

Thanks for your help with the column liner.

Chris

Sent from my iPhone

On Nov 14, 2010, at 21:58, Larry Ackerman <larry at saintrubidium.com>  
wrote:

> Sorry I had to leave before testing the SEM. How was the image?
>
> Larry
>
> On 11/10/2010 12:50 AM, Chris Murphy wrote:
>> 5pm works for me. Hopefully, it works for Mike as well.
>>
>> Chris
>>
>> Sent from my iPhone
>>
>> On Nov 9, 2010, at 20:35, Larry Ackerman <larry at saintrubidium.com>  
>> wrote:
>>
>>> Saturday the 13th is okay--how about 10:30 AM or 5:00 PM?
>>>
>>> Larry
>>>
>>> On 11/9/2010 3:28 AM, Chris Murphy wrote:
>>>> How does Saturday the 13th sound? We assume you are busy weekdays.
>>>> Weekday evenings tend to be hectic with events hosted in the space.
>>>>
>>>> Chris
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Nov 8, 2010, at 19:21, Larry Ackerman <larry at saintrubidium.com>
>>>> wrote:
>>>>
>>>>> I recall that this SEM does not have one single column liner but a
>>>>> number of components. In any case, I am willing to take any  
>>>>> parts and
>>>>> clean them in my lab and return them. If the schedule works out I
>>>>> might be present for the disassembly. Name a date and time.
>>>>> Larry
>>>>>
>>>>> On 11/7/2010 10:26 PM, Chris Murphy wrote:
>>>>>> Mike and I completed the SEM camera bellows tonight.
>>>>>>
>>>>>> We would love assistance from Larry or Joachim on replacement  
>>>>>> of the
>>>>>> column liner.
>>>>>>
>>>>>> Thanks,
>>>>>> Chris and Mike
>>>>>>
>>>>>> Sent from my iPhone
>>>>>> _______________________________________________
>>>>>> SEM mailing list
>>>>>> SEM at lists.noisebridge.net
>>>>>> https://www.noisebridge.net/mailman/listinfo/sem
>>>>>>
>>>>>
>>>>> --
>>>>> Larry Ackerman
>>>>> San Francisco
>>>>
>>>
>>> --
>>> Larry Ackerman
>>> San Francisco
>>
>
> -- 
> Larry Ackerman
> San Francisco
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