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Re: Si PMs proposal
HI Zisis,
Just responding to the question of the latest SiPM proposal. I agree we
need a smaller group, and also a draft sow from our side to clarify what
we would like to see. Here is my initial reaction to the draft 4.1 from
SensL. Some of these comments support Elke's previous response.
p. 6, should be called gain uniformiy (not optimization)
- goals are clear
- should the wafer level testing not come first?
p. 7.
The following statement "This (0.2 volts variations) is not thought to
be sufficient a variation to provide for the that are seen at the
glass array package level." is not supported by Carl's measurements. We
need to make sure we clarify this with Carl Jackson. If you look at slide
32 from George's presentation at the collaboration meeting, Carl's
measurements show that the gain changes from 240 down to 80 from a change
in bias from 1.1 down to 0.9V (this is a factor of 3). If we believe it
scales as a ratio to the voltage over breakdown, then for a nominal
setting of 2V, 0.2 V variation might be reduced to 1.5 (50%). These are
substantial changes in gain. Clearly other factors in the variation of
gain need to be checked but the tracking changes in breakdown voltage
should be further quantified.
p. 9 and 10: Work Packages 2 and 3: Crosstalk and Trenching
These are important issues, but in a priority list I would put them after
the issue of timing. This is because at the moment these do not seem like
they are limiting their use.
p. 11, Timing resolution
It is claimed that "SensL has demonstrated that it is possible to achieve
intrinsic timing resolution capability ... on 1mm SPM." I would like to
see this data; it might have been shown but I missed it. It is still my
concern that this is an issue. And we clearly need to proceed beyond the 1
mm SPMs to 3x3mm2 for verification before applied to the SPM arrays.
Here the deliverables emphasize the electronics, but initially the
intrinsic timing should be verified without electronics. The electronics
should be checked separately, and I am confident that this can be achieved
with a proper design.
Once we agree on the priorities, we can put together a draft sow.
Cheers, Elton.
> SensL and Proposal
> ================
>
> Elke, for this meeting we need a smaller group of people (you, Elton,
> George, Andrei, Carl and possibly Fernando). Can you guys propose a
> time to discuss the new SensL proposal? Friday or Monday afternoon
> would be ok for Andrei and me.
>
> Cheers, Zisis...
>
>
> >
> >> Date: Tue, 15 Jan 2008 17:17:42 -0600
> >> From: Zisis Papandreou <zisis@uregina.ca>
> >> To: Hall-D Collaboration <halld-collab@dustbunny.physics.indiana.edu>
> >> Subject: [GlueX] Calorimetry Group Meeting - Jan 18
> >>
> >> Hello folks:
> >>
> >> I have two issues in this email.
> >>
> >> 1. Day of the week and time of our periodic Calorimetry Group
> >> Meetings. There is a suggestion from JLab to reserve Friday's at
> >> 10-11am for our meetings. This does not mean that we will have a
> >> meeting every week, it is just that we are trying to find a time that
> >> works for all active participants of our group, considering the 8
> >> time zones between Regina through the East Coast to Athens (9 in the
> >> summer, but we will revisit this at the time).
> >>
> >> Please let me know if this time slot does not work for you.
> >>
> >> 2. I would like to schedule a meeting this Friday, Jan 18, so please
> >> reply to question 1 right away. The meeting is tentatively scheduled
> >> for 10am, unless I hear an uproar. The main topic is the work
> >> towards the Calorimetry Document, but other issues can be discussed.
> >>
> >> http://www.jlab.org/Hall-D/software/wiki/index.php/January_18%
> >> 2C_2008_Calorimetry
> >>
> >> Cheers and thanks, Zisis...
> >>
> >> ---
> >> Dr. Zisis Papandreou | email: zisis@uregina.ca
> >> Department of Physics | tel. : (306) 585-5379
> >> University of Regina | tel. : (306) 585-4149
> >> Regina, SK S4S 0A2 | fax. : (306) 585-5659
> >> World Wide Web: http://www.phys.uregina.ca/sparro/zisis/
> >>
> >>
> >>
> >
> > ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> > ) `\ -
> > / '. | +
> > | `, Elke-Caroline Aschenauer =
> > \,_ `-/ -
> > ,&&&&&V Jefferson Lab +
> > ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> > ,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
> > | |&&&&&&&;\ 12000 Jefferson Ave +
> > | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
> > | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
> > '--' `-.--. | +
> > \_ | |---' Tel.:
> > 001-757-269-5352 =
> > `-._\__/ Fax.:
> > 001-757-269-6331 -
> > +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-
> > +=-+=-+
> >
>
> ---
> Dr. Zisis Papandreou | email: zisis@uregina.ca
> Department of Physics | tel. : (306) 585-5379
> University of Regina | tel. : (306) 585-4149
> Regina, SK S4S 0A2 | fax. : (306) 585-5659
> World Wide Web: http://www.phys.uregina.ca/sparro/zisis/
>
>
>