[Halld] Fwd: Re: straight track data

[Mark Ito]

A proposal from Lubomir. We will discuss it at tomorrow's run planning 
meeting.


-------- Forwarded Message --------
Subject: 	Re: straight track data
Date: 	Thu, 24 Mar 2016 19:33:08 -0400 (EDT)
From: 	Lubomir Pentchev <pentchev at jlab.org>
To: 	Mark Ito <marki at jlab.org>



The link goes to the logbook, i.e. it's already shared. Of course you can send it, as well.

Sent from my iPhone

> On Mar 24, 2016, at 7:18 PM, Mark Ito <marki at jlab.org> wrote:
>
> I would like to forward your message to the group. If you object to that, let me know soon, perhaps by 9 pm tonight?
>
>> On 03/24/2016 06:31 PM, Lubomir Pentchev wrote:
>> Dear Run Coordinator,
>>
>> Since the solenoid is now down, we have the opportunity to get some straight track data with the beam, before ramping up the magnet.
>> The purpose would be:
>> - to look for sources of background by extrapolating the FDC tracks upstream.
>> - to check the efficiency of the detector with the new lower thresholds.
>> - to compare the alignment of the chambers w.r.t. previous run periods.
>>
>> We don't intend to do high statistic calibration and propose to get ~4 hours straight track data in the following conditions:
>> - Special FCAL&ST trigger (as used in the spring 2015 run, Sasha may need several hours in addition to tune the trigger).
>> - 100 nA current
>> - 10^-4 radiator
>> - ZERO field
>>
>> We will set current limits on the chambers less than 20 uA. Once the measurements are done either we will start ramping up the magnet, or turn off the HV of the chambers.
>>
>> Please include the topic in the tomorrow's discussions.You can include in the agenda this link:
>> https://logbooks.jlab.org/entry/3392044
>>
>> Thanks,
>>  Lubomir
>



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