The JRM Photo Gallery:
The Pelletron

In May 2000 we replaced the original belt-type charging system in our EN Tandem Van de Graaff with an NEC Pelletron system. The photos presented here are of the Tandem being converted to use Pelletron chains and of lab personnel conducting the acceptance tests on the finished product.

Each thumbnail below links to an image about 215 kB in size.

 

Picture
Graduate student ring poppers Mikhail Zamkov and Rivan Unal.
 		 Picture
Terminal section minus the drive belt and alternator.
 		 Picture
Inside the high-energy column, sans belt.
 
Picture
Modifications being made for the low-energy motor mount assembly.
 		 Picture
Terminal section with sheave mount being fitted.
 		 Picture
Terminal section showing sheave mounts.
 
Picture
Modification of the terminal platform for georator.
 		 Picture
Al Rankin installing the terminal chain sheaves.
 		 Picture
The view between the column and the rings showing the septum chain idlers.
 
Picture
High-energy column end showing completed chain drive assembly.
 		 Picture
High-energy end drive assembly.
 		 Picture
High-energy end chain drive motor and mounting.
 
Picture
Drive pendulum viewed from above.
 		 Picture
High-energy end of the tandem showing the high-voltage upcharge feedthroughs.
 		 Picture
Terminal section showing chain sheave and mount.
 
Picture
Low-energy end assembly without the chain.
 		 Picture
Low-energy end drive motor and mounting bracket.
 		 Picture
Low-energy end pendulum showing chain and drive sheave.
 
Picture
Low-energy end with complete assembly installed.
 		 Picture
Low-energy end of the tandem showing high-voltage feedthroughs.
 		 Picture
One of the two terminal sheave units with chain.
 
Picture
Terminal chain inductors.
 		 Picture
The Pelletron chain assembly.
 		 Picture
Close-up of chain links.
 
Picture
Larry Lamm (ND) and Bob Krause observing Mike Stiers (NEC) splicing the chain.
 		 Picture
Mike Stiers of NEC demonstrates chain splicing techniques.
 		 Picture
Bob Krause gives it a try.
 
Picture
Adjusting chains. From front, Larry Lamm (ND), Mike Stiers (NEC), Bob Krause and Mike Wells.
 		 Picture
Completed terminal assemblies installed.
 		 Picture
Chain passing through the septum idlers.
 
Picture
Chain passing through idlers inside the rings.
 		 Picture
Pelletron charging schematic.
 		 Picture
Bob Krause making alterations.
 
Picture
Charging system control panels in the control room console.
 		 Picture
Chain drive motor starting box.
 		 Picture
Rings being remounted after completed installation.
 
Picture
Mike Wells and Kevin Carnes discussing electrical control installation.
 		 Picture
Acceptance testing. Mike Stiers of NEC, Kevin Carnes and Tom Gray are shown (left-to-right).
 		 Picture
They're still testing.
 
Picture
Tom, Mike, Pat Richard and Mike Wells are all smiles as the Tandem passes its acceptances tests.