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Fwd: Gain fro the new HV settings
Dear all,
using old and new numbers and new measurements:
mod 3300 3400 3500 var. G(var)
=============================
en1 1723 2990 6038 3475 dis
en2 1028 1677 3778 3550 5971
en3 1095 1766 3849 3550 6038
en4 939 1540 3249 3575 5367
en5 667 791 1218 3600 3213
es1 1684 2825 6356 3475 6278
es2 1042 5028 ???? 3500
es3 734 943 1589 3600 2719
es4 569 501 636 3600 1243
------------------
interesting to note that most gains came out higher then expected. may
be it is a pressure or some other systematic change.
here are further suggestions:
---------------------------------------------
en1 dis <- recheck
en2 3550 5971 <- declare operational
en3 3550 6038 <- declare operational
en4 3575 5367 <- declare operational
en5 3600 3213 <- set to 3675
es1 3475 6278 <- declare operational
es2 3500 <- wait for re-production
es3 3600 2719 <- set to 3700
es4 3600 1243 <- disable
I think we shall also consider disabling some modules we are not going
to operate because
of multiple problems on them to keep the event size lower.
If you do not object I can set these changes today.
Concerning RB data in Ilia's first mail.
--------------------------------------------------------
> 40V (for ideal module) -> 65V (for EN3) -> E_d=-0.43 kV/cm
> 60V -> 85V -> E_d=-0.57 kV/cm
> 80V -> 105V -> E_d=-0.7 kV/cm
> So on the titles of the plots that I placed at:
> https://www.phenix.bnl.gov/WWW/p/draft/ravini/hbd_voltage_gain_scan/
> hbd_rb_hadrons_3500V_40V_en3.gif
> hbd_rb_hadrons_3500V_60V_en3.gif
> hbd_rb_hadrons_3500V_80V_en3.gif
I see no much difference between them unless I do not know where to
look. What kind of other information shall we expect from this files?
Would we like to plot something like the step - function curve to
confirm the one from R&D?
Some other questions coming out of these studies.
I understand the suggestion is to go with the lowest, currently 40V
nominal. Is that so?
Shall we also look into 20V file? Do we see any module which is still
in FB regime when we set nominal RB20?
The rejection plot is very interesting. How high can we set the
threshold? that can be of a great importance to us very soon id DAQ
force us into zero suppression. On the other hand as it comes out
from Ilia's studies we are not loosing much setting (pad?) threshold
to 2e or 20adc_chan. I think (but not sure, I need takao's input) this
is higher than we have now.
best,
Sasha
> ES1 (3475V) - 6278, was 6356 at 3500V, but we do not know P/T changes.
>
> ES2 (3500V) - unfortunately at the beginning of this run 227763 ES2 was
> down, I've already asked Anne to produce the new 10 segments where it was
> operational (I already see that they are running, thanks Anne!). Next time
> I'll read this excell file more carefully. BTW, the gain I reported a few
> days ago for this module was 5028 at 3400V and not at 3500V , so we should
> leave it at 3400V.
>
> ES3 (3600V) - 2719, was 1589 at 3500V.
>
> ES4 (3600V) - 1243, was 636 at 3500V.
>
> EN2 (3550V) - 5971, was 3778 at 3500V.
>
> EN3 (3550V) - 6038, was 3849 at 3500V.
>
> EN4 (3575V) - 5367, was 3249 at 3500V.
>
> EN5 (3600V) - 3213, was 1218 at 3500V. There is some strange thing noted
> by Itzhak last time: this module has dI a bit less than EN4 but its gain
> is much less than on EN4.
>
> The plots are at the same place, the have extension *new.gif
>
> Ilia
>
> ================================
> Ilia Ravinovich
> Department of Particle Physics
> Weizmann Institute of Science
> Rehovot 76100
> Israel
> Phone: 972 8 934 3187
> FAX: 972 8 934 4166
> E-mail: Ilia.Ravinovich@weizmann.ac.il
> ===============================
>
> _______________________________________________
> Phenix-electron-l mailing list
> Phenix-electron-l@lists.bnl.gov
> http://lists.bnl.gov/mailman/listinfo/phenix-electron-l
>
--
PHENIX-BNL Group, Physics Dept.
Brookhaven National Laboratory
20 Pensylvannia st. (bld. 510C), Upton NY 11973 USA
tel: +1 631 344 7017 fax: +1 631 344 3253
email:amilov@bnl.gov
skype:sasha.milov
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