[Sneap] problem of ion source

[cslee]

Dear Friends:

18 years ago I started to use 358A ion source ( duplasmatron produced by general ionx, now the same type of ion souce is produced by high voltage engineering in europe neitherlanders).  Three four years ago  I had the exactly same experience as the manual statement, unfortunately recent three four years I have to try and "guess" a lot to make the ion source work.  It does waste too much time.   The coating solution I used, except Cathode Coating T-33C-118 (Ba-Sr-Ca) CO3 56-31-13%., we aslo used the product from HV company (it only marked: A848001, B-6976 with a HV trade mark).    According to the manual when we bake the filament with the coating, the voltage between the anode and intermediate anode (or electrode) is over 34 volts.  Then there is enough thermal electrons to induce a stable discharge.  Now the voltage we measured only less than 1 or 2 volts, and the the current we used is over 26 amperes.   This coating solution we just purchased last year, so there are some problems which we don't find it out yet.   If you know where is the problem,  please  informe me I'll appreciate that very much.  Otherwise you can provide me which university or comapny use the same types of coating and  ion source, I may  seek their help.

Here I delievered to you the description about the coating procedure from the manual of the ion source .

" wash" the filament back and forth in the coating to insure it flows through the gauze mesh.  Approximately 20 seconds is sufficient.    (quote from the accompanied files).

 But now we need to work about two hours to coat the solution on the mesh." and it doesn't work at all.


Best regards


CS Lee 

email address: cslee at phy.ncu.edu.tw
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