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teleconf - status of TPC

Dear friends,

prior to the teleconf, I want to inform you about the status
and related decisions we had to take conc. our TPC:

As you know, last month, after having tuned the TPC up to 6.5 kV,
a hot spot suddenly developed which we could eventually burn down
in 10 bar N_2. Later we found a second one - not visible in 10 bar
N_2, but drawing at 5.2 kV about 500 nA in 5 bar N_2 (this gives
an amplification condition eqivalent to 10 bar protium). So far,
we found no way to cure it.

Therefore, we decided today to open tomorrow the TPC and inspect
these well localized spots and also some earlier ones which have
disappeared. It is important that we understand the nature of these
deficiencies and to find the way how we can overcome the problem.

Obviously, it is right now difficult to predict when the TPC is
ready again for cosmics or beam tests. We will try the best and
keep you informed about any development.

With best regards

Claude


Peter Kammel wrote:
> 
> Dear colleagues,
> 
> In view of the upcoming activities, we should have a
> coordination and update teleconf soon. I suggest
> 
> Tuesday April 15 or Wednesday April 16
> at 9 AM central time = 4 PM Swiss time.
> 
> I would organize the conf number. Please tell me your
> availability and I will confirm the teleconf + tel number
> after receiving your input.
> 
> With best regards
> 
> Peter
>