There was also speculation that angle reconstruction
with thin targets suffers from left-right ambiguity
resolution problems for a certain range of angles
in which the particle trajectory passes through the
center of each drift cell in region 1. We saw similar
structures in e1e using a 2 cm target. Mac may recall
this.
Cole
On Thu, 14 Feb 2008, Maurik Holtrop wrote:
> Sebastian,
>
> I cannot remember for sure, but I seem to remember that there was an issue
> with bit-truncation in the DST, so that the histogram would look incorrect
> depending on how well the bits of the number plotted correspond to the
> binning chosen. Do the wiggles look different if you change the binning
> slightly?
>
> Best,
> Maurik
>
> On Feb 14, 2008, at 4:09 PM, Sebastian Kuhn wrote:
>
>> Dear (former) EG1ers (and especially "oldtimers"),
>>
>> I am trying to remember what our final conclusion was regarding the
>> infamous "wiggle/theta oscillation" problem with EG1a - see
>> http://www.jlab.org/ccc/mail_archives/CLAS/eg1_run/msg00274.html to jog
>> your memory. I went through all my accumulated notes but couldn't find any
>> conclusive solution (and my memory is just not as good as it used to be...
>> ;-)
>> It appears possible that we have a similar problem in EG1b, see
>> http://www.jlab.org/Hall-B/secure/eg1/EG2000/sharon/theta_compare/theta_compare_5_6.gif
>> (and BoNuS, for that matter! ->
>> http://www.jlab.org/~slava/Check44/Check44_18/ThetaEL/thetael_raw_0211_44_1_pre_el5gev.jpg
>> ).
>>
>> Any recollections are welcome - Sebastian
>