Hollow Cathode Light Source at MSU

Aaron KingeryMSU 2009 REU

MOSES

• Multi-Order Solar EUV Spectrograph

 • Sounding rocket payload

 • Takes images and spectrum

simultaneously  

Multi-Order Grating

   

Extreme Ultraviolet

 

Hollow Cathode Lightsource (HCL)

Hollow Cathode Lightsource (HCL)

"The Test"

1. Pump the intermediate chamber and HCL chamber down 

2. Isolate the HCL chamber3. Record the pressure in the

HCL as a function of time

First Tests

 

   

Ethanol Test

1: No ethanol 2: Ethanol on top3: Ethanol on bottom4: No ethanol

Virtual Leaks

 

Virtual Leaks

 

Stabilization Pressure

 

How Do You Find the Leaks?

Remove things from the system Check for leaks If the leak is still present, remove more things. 

How Do You Find the Leaks?

Problems:

Can't remove the pressure gauge or valve

Can't rule out anything if the leak persists.  

Large Vacuum Chamber

Will be used to test MOSES

Large enough to put the MOSES payload inside

Needs to be clean

Residual Gas Analysis Scan

 

Photo diode

It was held into possition by the pins

The electical connections was also made by the pins.

Pin broke off

We had make a new way to it to be held and allow it to send a signal

Upon testing it was found to be broken

To-Do List

• Get new photo diode • Turn on the HCL

 • Test the HCL using Ne

 • Calibrate and Test MOSES

Conclusions

• HCL is almost free of leaks • We need a new photo diode to test the HCL

 • Overall a very productive summer