[Olympus] Acceptance Simulations

[Axel Schmidt]

Hi Michael,
	I'm attaching the plot of the acceptance double ratio with all four configurations as was initially proposed.  One can see that even with gaps in the ToFs, the ratio remains very close to 1.  

	I have done some studies with different magnetic field strengths (all with positive polarity).  None of the results were so different than those at 5000 A, so I did not find them so intriguing.  

Cheers,
Axel

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On Nov 20, 2012, at 8:26 AM, Michael Kohl wrote:

> Dear Axel,
> could you post the result for the B+/B- four-fold ratio (I saw it on Jan's 
> screen last week). Also, have you done any further tests as was suggested 
> by various people?
> 
> Thanks,
>    Michael
> 
> 
> 
> On Thu, 15 Nov 2012, Alexander Kiselev wrote:
> 
>> Good morning colleagues,
>> 
>>>  now, it would be great to see what happens if we would do the double
>>> ratio with B+ and B-.
>> 
>> I suggest we treat these first results very carefully now (be neither
>> too optimistic nor too pessimistic). I understand at present we are
>> investigating pure geometric effects, right? Last time I looked into the
>> ToF MC, there was no attenuation included (so there was a single Edep
>> variable per paddle; perhaps this has changed already?). At some point it
>> would be great to see what happens if this effect is accounted, and some
>> a-la-trigger threshold set in the simulation. Handling edge inefficiency
>> as 1-2cm gaps can be the first - although instructive - approximation only.
>> 
>> Regards,
>>   Alexander.
>> 
>>> Best,
>>> Jan
>>> 
>>> On 15.11.12 03:15, Axel Schmidt wrote:
>>>> On Nov 14, 2012, at 12:07 PM, Michael Kohl wrote:
>>>> 
>>>>> Hi Axel,
>>>>> this looks good. On first sight, the acceptance changes are small.
>>>>> One needs much more statistics at backward angle. Maybe use a white generator with weights rather that cross-section distributed events.
>>>> 
>>>> Here is  a plot using data from a generator that is isotropic in the lepton angle.
>>>> 
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>>>> 
>>>>> For the comparison of gap vs no gap, one would need to look at ratios of ratios.
>>>>> 
>>>> 
>>>> And here is that same data, plotted as a ratio of ratios.
>>>> 
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>>>>> Thanks and best regards
>>>>>  Michael
>>>>> 
>>>>> 
>>>>> 
>>>>> On Wed, 14 Nov 2012, Axel Schmidt wrote:
>>>>> 
>>>>>> Hi Michael,
>>>>>> 	Here are plots showing the effect of introducing gaps between the tof bars (B+ mode only).  I show two different binning schemes side by side.
>>>>>> Cheers,
>>>>>> Axel
>>>>>> 
>>>>>> 
>>>>> 
>>>>> +---------------------------------------------------------------------
>>>>> | Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
>>>>> | Physics Department, Hampton University, Hampton, VA 23668
>>>>> | Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
>>>>> | Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
>>>>> | Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
>>>>> | Email: kohlm at jlab.org
>>>>> | Cell:  +1-757-256-5122 (USA)
>>>>> |
>>>>> | Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
>>>>> | Phone: +49-40-8998-6406, Cell: +49-171-101-1967
>>>>> +---------------------------------------------------------------------
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> 
> +---------------------------------------------------------------------
> | Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
> | Physics Department, Hampton University, Hampton, VA 23668
> | Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
> | Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
> | Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
> | Email: kohlm at jlab.org
> | Cell:  +1-757-256-5122 (USA)
> |
> | Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
> | Phone: +49-40-8998-6406, Cell: +49-171-101-1967
> +---------------------------------------------------------------------
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