[Alert_collaboration] Fwd: ALERT

[Kawtar Hafidi]

Hi folks,

See message by Jay benesch and questions about ALERT. We will need to send
a response. I will be on vacation next week but let's have ALERT meeting
same time Thursday to discuss the plan forward.

Best,

Kawtar

---------- Forwarded message ----------
From: Jay Benesch <benesch at jlab.org>
Date: Fri, Jun 24, 2016 at 6:21 AM
Subject: ALERT
To: Kawtar Hafidi <kawtar at anl.gov>


Dr. Hafidi,

I am on JLab's Technical Advisory Committee so I have the ALERT run group
proposals.  I have no technical comments but you'll see my name on a TAC
report.  I am also on a "gradient maintenance team".  Two decades ago Stan
Majewski and the detector group recommended scintillating fiber and PMTs to
monitor field emission.  Accelerator Division has never been willing to
prototype.  The two layers of scintillators in ALERT caught my eye.

a. what is the radiation hardness of the scintillator?  One year at the end
of a C100 -> 1 MGy.  Below C100 ~ 0.1 MGy.

b. rad hardness of SiPM?

c. rough cost of the 30 cm bars + SiPM?  Rough cost of 3 cm outer layer
units?

The 3 cm units could work well at the ends of the cryomodules where there
is a copper "radiator" in the end can.  The 30cm units could be placed on
the floor under each cavity.  Lots of assumptions here on my part, but then
we have gammas up to 100 MeV so the energy range isn't too far off.

I would appreciate it if you'd pass this along to whomever might be able to
answer these questions.  If you feel the questions are out of line, I'd
appreciate your telling me that.  Thank you.

Jay Benesch
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