Re: no progress tonight

[Brendan Kiburg <kiburg@npl.uiuc.edu>]

Dear Peter,
  After Peter sent this email, Marat came to fill CHUPS. We then rolled
back the TPC for the test.  You can perform the test in the morning.

  We looked at the TPC and have observed significant problems with the TPC
current.  It has soft tripped several times already since reaching the
non-amplifying range and we no longer think it is reasonable to proceed
with the TPC in measuring position until the TPC team has diagnosed the
problem.  Therefore, after the water test, you can leave the TPC pulled
out.  Fred and I have installed the AK-3 target inside the ePCs without 
careful measurement.  After your test you can align the target with the
beam and the DAQ (assuming the EIC repair/training is successful).  We
would then try to run mu+ on AK-3 tomorrow during the day. For minor alignment
of the AK-3, there is no need to lower the ePC voltages.  I am pretty
sure that Bernhard did not lower the HV on the ePCs for the installation
either.

Happy Beaming,
Brendan  
 

On Thu, 13 Apr 2006, Peter Kammel wrote:

> Dear Peter,
> 
> The Russians did not show up. So let's postpone the
> magnet test until tomorrow morning, then we can carefully
> push the TPC in. In the last moment, be careful that
> the cable coming from the TPC front face does not
> touch the mPC/mSC construction. One person should
> watch from the left upstream side of the eDet. You
> can see that the TPC is not touching the ePC walls
> up to the moment when it is nearly in, when the
> TPC is close to the final position you might see the cable.
> 
> If there are any uncertainties, please wait for me.
> 
> Please reduce the TPC HV to 4700, the ePCs to 2200
> before this operation.
> 
> Brendan, if you have additional remarks, please add those.
> 
> Good luck.
> 
> Peter
> 
>