There are a couple of things to consider. To change the target from W to Pt, the theorists need to be contacted. Changing the target parameter from W to Pt is not enough and the nuclear screening effect needs to be changed properly. If we are not measuring the large angle bremsstrahlung cross section at a percent accuracy, W vs. Pt probably does not matter. Since we ran the chicane field at -25%, the beam position and angle have shifted a bit. If we set these beam parameters in stdhep files, these files will be specifically for the Dec run.

Takashi 
________________________________________
From: Stepan Stepanyan [[log in to unmask]]
Sent: Saturday, January 17, 2015 10:18 AM
To: Graham, Mathew Thomas
Cc: Maruyama, Takashi; Rafayel Paremuzyan; hps-software
Subject: Re: Moller and Large angle Bremsstrahlung simulations

Hi Matt,

We would love to have the same beam energy, but the energy setting is
not driven by HPS.
In fact it is not driven by any of experimental halls at this point (we
are still not in full physics
production mode and machine settings have some constrains). For example,
in Nov.-Dec. run
machine lost one of C100 cavities and could not get to 1pass >2 GeV. But
I am sure for 12 GeV
project it will be important to have close to design energy operation,
so this time around they
will try to get 1pass >2 GeV. But we will see.

Stepan

On 1/17/15 11:43 AM, Graham, Mathew Thomas wrote:
> I thought we were expecting 1.92 GeV again for the spring…?  You and John wanted the reach for 1 week at 1.92...
>
> On Jan 17, 2015, at 8:25 AM, Stepan Stepanyan <[log in to unmask]> wrote:
>
>> Matt,
>>
>> I do not think there will be too big difference with W or Pt target, but if you
>> are thinking that this simulations can be used for spring run, I can almost
>> guarantee the energy in the spring run will be sufficiently different than what
>> we had in December. So, why not go with Pt?
>>
>> Stepan
>>
>> On 1/16/15 10:36 PM, Graham, Mathew Thomas wrote:
>>> Let’s generate with a W target just so that we can re-use the simulation…I don’t think were measuring anything to 5% in the december run...
>>>
>>> On Jan 16, 2015, at 4:07 PM, Graham, Mathew Thomas <[log in to unmask]> wrote:
>>>
>>>> We should generate some at 1.92 GeV so that we a) can run them through the eng.  run detector and b) have them for the spring run beam energy.
>>>>
>>>> On Jan 16, 2015, at 1:52 PM, Maruyama, Takashi <[log in to unmask]> wrote:
>>>>
>>>>> These are large angle bremsstrahlungs. I have generated large angle bremsstrahlung events using MadGraph, and Kyle should have processed those for trigger study. The beam energy is 2.2 GeV though.
>>>>>
>>>>> Takashi
>>>>>
>>>>> -----Original Message-----
>>>>> From: Rafayel Paremuzyan [mailto:[log in to unmask]]
>>>>> Sent: Friday, January 16, 2015 1:39 PM
>>>>> To: Maruyama, Takashi; hps-software
>>>>> Subject: Re: Moller and Large angle Bremsstrahlung simulations
>>>>>
>>>>> The target was 5um Platinum,
>>>>> I have looked into files with different triggers (just singles, loose pairs, med-energy elastics), and all more more or less shown these events Triggers that I used are defined in the trigger config file 1st_list.tar in the attached figures shown "E2vsE1" that shows their energy equal to the beam energy (with some factor off, that might be sampling fraction, or energy calibration) "y vs x" distributions of clusters for the events that are within area defined by red rectangles.
>>>>> Also their energy distribution as a function of x is not very close, but also is not that different both clusters in electron side and positron side have low and high energies.
>>>>>
>>>>> Also coplanarity is not working for these events, and their coplanarity center is shifted to the electron side (-25 mm), whereas if they are neg-pos pairs, it should be around 40mm.
>>>>>
>>>>> In Mock data we don't have truth information, and also in order to get more precise answer I was thinking will be better to have as close conditions to the experiment as possible.
>>>>>
>>>>> I will try to have a look into mock data more closely.
>>>>>
>>>>> Rafo
>>>>>
>>>>>
>>>>> On 01/16/2015 02:46 PM, Maruyama, Takashi wrote:
>>>>>> Hi Rafo,
>>>>>>
>>>>>> These are interesting events. If they are Mollers, both are in the electron side. If they are brems, one cluster is near the photon hole and one cluster is the electron side. I would like to know the distribution of these events.
>>>>>>
>>>>>> Mollers have been simulated correctly so you should see them in the mock data. Large angle brems are not in the mock data, but I have generated large enough sample for trigger study. All these data are for 2.2 GeV though.
>>>>>>
>>>>>> We need to discuss the 1.92 GeV simulation.
>>>>>>
>>>>>> Takashi
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: [log in to unmask]
>>>>>> [mailto:[log in to unmask]] On Behalf Of Rafayel
>>>>>> Paremuzyan
>>>>>> Sent: Friday, January 16, 2015 11:19 AM
>>>>>> To: hps-software
>>>>>> Subject: Moller and Large angle Bremsstrahlung simulations
>>>>>>
>>>>>> Hi Takashi and Matt,
>>>>>>
>>>>>> Analyzing engineering runs,
>>>>>> we are seeing some two cluster events having their energy sum close to beam energy.
>>>>>> We think that they might be from Moller or Large angle Bremsstrahlung.
>>>>>> To check it we will need new simulations with lower beam energy 1.92 GeV and 25% lower magnetic field.
>>>>>>
>>>>>> I would like to ask you is it possible to make simulations of above mentioned reactions, and reconstruct them.
>>>>>>
>>>>>> Or Matt, if it is straight forward to make readout and reconstruction, could you please just tell us which steering files we will need to use for readout and reconstruction, and we will try to do it ourselves.
>>>>>>
>>>>>> Rafo
>>>>>>
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