Re: flat? background

["David W. Hertzog" <hertzog@uiuc.edu>]

Peter,
   How is this different from the fill skipper now employed?  I guess you 'tease' the situation by having the gate open but then you end up using a detector to decide if indeed the fill was empty...then you look at it.  But, of course, to the extent that the detector is inefficient -- it will be at some level -- you will examne "empty" fills that actually have muons, and muon lifetime distortions.  The background will have a muon lifetime slope on it from this situation. 

   If you try to lower the probability, say, by lowering the beam rate even more, then you are looking at perhaps a different animal and that might not be so easily extrapolated to the working situation.

    I am rather fond of the idea of the empty target but people are forgetting that we would really need helium all the way out to get rid of the muons.  Just to remove the AK3 means the muons will all stop in the back half of the air after the helium bag runs out.  (let's talk on this in person)

    thanks for coming to Alto.

    Dave

Peter Kammel wrote:

Dear Dave,

Below is my e-mail exchange how we will try to measure the
flat background for MORE. Can we do the same for MuLan?
E.g. Ton=0.5 us, Rm=1 MHz, then we would have a significant
fraction of "empty" fills (off line selected by the EMC).
In this case no real signal overlaps the flat or distorted
background !  One should estimate the shifts required for
a serious measurement, but I am excited about this
idea. Both the EMC and the ball could provide us undisturbed
background measurements for such a case. 

What do you think?

Peter


---------- Forwarded message ----------
Date: Sat, 15 Oct 2005 10:35:22 -0700
From: Frederick Gray <fegray@berkeley.edu>
To: Peter Kammel <kammel@npl.uiuc.edu>
Subject: Re: a few thoughts on more

  

What I mean is closing the gate after say 1 us and then analyzing the
pulses which did *not* have an incoming muon during the pulse open
time. Then you would only see the background deformation. It needs
more carefull thinking which systematic effects you can catch with
such a method. But it is important to work out these tests to
judge whether kicking is a good option.
    

OK, now I understand (you might want to consider adding something like the 
explanation above to the the document).  Another possibility that I can think 
of would be to construct a lead plate that exactly covers the active region of 
the muPC.  Then you will only see the "sneaky" muons.