[Sneap] problem of ion source

[VICTOR ROTBERG]

Dear cslee

 

I had similar sufferings as you describe in your email.  For us the
resolution of the problem came as we discovered the correct way of mixing
the solution.  We roll the bottle in a stone polisher in the horizontal
position for 1 hour.  You can get one of those in hobby stores.  

 

I hope this helps.

Regards

 

Victor Rotberg

 

 

 

  _____  

From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu] On
Behalf Of cslee
Sent: Monday, December 10, 2007 11:41 PM
To: sneap at tunl.duke.edu
Subject: [Sneap] problem of ion source

 

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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