[Dsg-rich] Reflectivity test station's monochomator not working

[Tyler Lemon]

Hello, 

After calling Newport to ask for recommendations on what can be done to fix the monochromator, they recommended to check whether the diffraction grating had turned too far, going past its home location causing an error condition. 

Page 6 of the attached pdf describes the procedure they gave to recover from the error condition. 

With the monochromator powered off, Luca and I manually turned the diffraction grating using the drive gear. We then powered on the monochromator and it was able to verify its home position and be operated as normal. 

The monochromator is now working again and can be used as before for reflectivity tests. 

Best regards, 
Tyler 


From: "Amrit Yegneswaran" <yeg at jlab.org> 
To: "Mirazita Marco" <Marco.Mirazita at lnf.infn.it> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "dsg-rich" <dsg-rich at jlab.org> 
Sent: Thursday, November 2, 2017 4:54:56 PM 
Subject: Re: [Dsg-rich] Reflectivity test station's monochomator not working 

marco, 
i do hope they can. 
it would be wonderful 
maybe nick has a spare monochromator 

but from past experience, i would say its wishful thinking. 
last time peter had to fix the problem. 

maybe, tonight i should give the monochromator a couple of whacks! 
remember murphy's law "If it jams - force it. If it breaks, it needed replacing anyway."!!! 

amrit 


From: "Marco Mirazita" <Marco.Mirazita at lnf.infn.it> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-rich" <dsg-rich at jlab.org> 
Sent: Thursday, November 2, 2017 3:30:03 PM 
Subject: Re: [Dsg-rich] Reflectivity test station's monochomator not working 

Hi Tyler, 
You could contact Yuri or Nick first, perhaps it is a known problem and 
they know how to solve it. 
Marco 


Il 2017-11-02 14:41 Tyler Lemon ha scritto: 
> Hello, 
> 
> Today, just before lunch Marco Mirazita informed me that the 
> monochromator used for the reflectivity test station was not 
> responding. 
> 
> The monochromator's program was frozen and shown as not responding on 
> the screen. 
> 
> I tried the following to get it working again: 
> 
> - power-cycled monochromator 
> 
> - power-cycled PC 
> 
> - swapped USB chords 
> 
> - confirmed that device was seen by PC in device manager 
> 
> - confirmed drivers are up-to-date on PC 
> 
> - attempted to use updated version of program from Newport, the 
> monochromator's manufacturer. 
> 
> - used local version of program installed on PC rather than version on 
> O: drive. 
> 
> After all of the above, the onochromator still does not respond when 
> using the program. Since the PC shows that it sees the monochromator 
> in the device manager, it seems that it is a hardware issue. 
> 
> Peter has also looked at the monochromator and came to the same 
> conclusion that it is most likely a hardware issue. 
> 
> This afternoon, I will contact Newport to see if they have any 
> suggestions and to see if they have one that they could load us to be 
> able to complete the reflectivity measurements. 
> 
> Best regards, 
> 
> Tyler 
> 
> 
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