[Solid_ec] SoLID EC/DAQ meeting 9:00am Thursday 4/7/2016 CC F227

[Vincent Sulkosky]

Dear Ye Tian,

Thank you for your question.  It's impossible to see from the picture I showed at today's
meeting, but we use two scintillator bars.  The second bar is below the hedgehog assembly.

For the readout of the fibers, I am using a Phillips XP2262 PMT, which has relatively
high gain (-2100 V).  With this PMT, I can isolate the single photon peak easily.  The
gain and location of the SPE is fairly stable with this PMT, which is another reason
I prefer to use it. 

If I tried to use the Hamamatsu R11102 PMT, I would not be able to see the SPE, and I 
would have to rely on the gain as you do.

Best Regards,
Vince

----- Original Message -----
From: "Ye Tian" <tianye.sdu at gmail.com>
To: "Vincent Sulkosky" <vasulk at jlab.org>
Cc: "solid ec" <solid_ec at jlab.org>
Sent: Thursday, April 7, 2016 10:48:53 AM
Subject: Re: [Solid_ec] SoLID EC/DAQ meeting 9:00am Thursday 4/7/2016 CC F227

Hi Vincent,
   I'm still curious about your cosmic test trigger. Do you use one
scintillator or two scintillators for trigger? If you just use one, that
make sense.
   As we know, the detection effeciency is very high, if use two
scintillators, it could reach more than 98%. For our experiment before,
it's hard to detect single photon when using two scintillators as trigger,
only the trigger threshold is very low.  Because the single photon peak is
stable, we get the gain of every PMT using other method, and then get the
photon number from signal divided by gain.

Best Regards,
Ye Tian

On Thu, Apr 7, 2016 at 8:54 AM, 焦健斌 <jiaojb at sdu.edu.cn> wrote:

>
>
>
> > -----原始邮件-----
> > 发件人: "Vincent Sulkosky" <vasulk at jlab.org>
> > 发送时间: 2016年4月7日 星期四
> > 收件人: "solid ec" <solid_ec at jlab.org>
> > 抄送: "Solid daq" <solid_daq at jlab.org>
> > 主题: Re: [Solid_ec] SoLID EC/DAQ meeting 9:00am Thursday 4/7/2016 CC F227
> >
> >
> > Dear All,
> >
> > I attached the wrong file last night.  Here is the correct file for
> today's meeting.
> >
> > Best Regards,
> > Vince
> >
> > --
> > Vincent A. Sulkosky
> > Research Associate, UVA
> >
> > CEBAF Center F358
> > Jefferson Lab                Phone at JLab: (757) 269-5487
> > 12000 Jefferson Avenue       Phone at UVA:  (434) 924-7589
> > Suite #4, MS 12              email: vasulk at jlab.org
> > Newport News, VA 23606       Fax:   (757) 269-5703
> >
> >
> > ----- Original Message -----
> > From: "Xiaochao Zheng" <xiaochao at jlab.org>
> > To: "solid ec" <solid_ec at jlab.org>, "Solid daq" <solid_daq at jlab.org>
> > Sent: Wednesday, April 6, 2016 11:39:52 AM
> > Subject: [Solid_ec] SoLID EC/DAQ meeting 9:00am Thursday 4/7/2016 CC F227
> >
> > Dear All:
> >
> > We will have our SoLID EC/DAQ meeting at 9:00am US EST on Thursday
> 4/7/2016. The location is CC F227.
> >
> > The call-in instruction is shown below. Meeting minutes can be found at
> >
> http://hallaweb.jlab.org/experiment/PVDIS/SoLID/EC/meetings/SoLID_EC_Weekly_minutes.html
> >
> > If you have slides to present, please email them to everyone by replying
> to this email (or to me) before the meeting.
> >
> > Thanks,
> >
> > Xiaochao
> >
> > To join the Meeting:
> > https://bluejeans.com/681485548/7290
> >
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> >
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> > _______________________________________________

-- 
Vincent A. Sulkosky
Research Associate, UVA

CEBAF Center F358
Jefferson Lab                Phone at JLab: (757) 269-5487
12000 Jefferson Avenue       Phone at UVA:  (434) 924-7589
Suite #4, MS 12              email: vasulk at jlab.org
Newport News, VA 23606       Fax:   (757) 269-5703