[Brahms-l] Fw: SPY news update: Time Meeting on Feb. 3, 2004 ... schedule ... less boring ...

FYI
----------------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory

e-mail: videbaek@bnl.gov
phone: 631-344-4106
----- Original Message ----- 
From: "Kin Yip" <kinyip@bnl.gov>
To: <kinyip@fnal.gov>
Sent: Monday, February 09, 2004 11:35 PM
Subject: SPY news update: Time Meeting on Feb. 3, 2004 ... schedule ... less
boring ...


> ====== Scheduling Physicist -YIP (ie. SPY) news channel ========
>
>
> (0)  Correction :
>
>       In my last email, when I mentioned 13 kV & 14 kV for Tandem, it
should be
>       really be 13 or 14 MV !  Tandem produce beams typically in MeV
levels.
>
>                       ******************************
****************************
>
> (1) The usual Time meeting will be held at 13:30 on Feb. 10 (Tuesday),
2004
> in the Snyder Room (911A).
>
>                       ******************************
****************************
>
> (2) Schedule in the immediate future:
>
>    Feb. 11 (Wed.):    07:00 - 19:00 for Beam Expts.
>
> There may be machine development on Thursday or Friday but there is no
firm
> plan at this moment.  It depends how things develop in the next day or 2.
>
> Otherwise, it's physics running !
>
>                       ******************************
****************************
>
> (3) Status in my view (NOT official/C-AD but only MY very personal point
of view ! .....
>       Don't get confused ) :
>
> The last few days have been "less boring" for the operation/machine
physicists.  Like in the
> stock market, there are always up's & down's.   In addition to Tandem
problems and some
> RHIC injection problem (missing data on ramping up to top energy for the
Beam Profile Monitor),
> we have had various quency/permit link problems as well as power
supply/front-end crates having
> to be replaced.   The bad guys just suddenly came together to hit us.
However, today, it seems
> that the tide may have turned and it's looking better .....
>
> Right now, people are trying to figure out whether PHOBOS' background
problem is related to
> a vertical bump of ~7 mm (towards the sky) of the orbit.   This vertical
bump would make the
> collision points/vertices at PHOBOS several mm higher than their optimal
point and they are very
> sensitive to it.    We thought we could just get rid of this vertical bump
but it seems that the
> existence of this vertical bump might (I said MIGHT !) help reduce PHOBOS'
background.
>
> More evidence seems to point to electron multipacting --- a phenomenon of
resonant electron
> multiplication (the simplest/shortest explanation I could find in Google
is  http://www.rni.helsinki.fi/research/em/EM_multipacting.html) --- being
the driving mechanism for
> PHOBOS' background problem.   When this happened, we saw vacuum pressure
significantly
> above the nominal levels.  It's thought the fact that PHOBOS has the
longest Beryllium
> beampipe may have something to do with this.
>
>
> Looking forward a little bit more,  I am glad that we begin to see plans
for concurrent running
> of RHIC (gold or polarized-proton), NSRL (NASA), polarized-proton
preparation in
> AGS/Booster and BLIP (~Brookhaven LINAC Isotope Production).   It better
be ... as we
> don't have much time left.
>
>
> ====== ======= ====== ======= ====== ======= ====== =======
>
> This SPY news channel solicits YOUR input of any sorts.
> You'll be paid back with loads of gratefulness :-)
>
> Let me know if you want to get out of this private email mailing list.
>
> SPY's webpage :
>
> http://www.c-ad.bnl.gov/kinyip/SchedPhys/
>
>


_______________________________________________
Brahms-l mailing list
Brahms-l@lists.bnl.gov
http://lists.bnl.gov/mailman/listinfo/brahms-l