[Olympus] Updated TDR for Friday
Brinker, Frank
frank.brinker at desy.de
Wed Dec 9 10:33:29 EST 2009
Hi,
Of course the clean way is to include numbers for both energies. If this
is not possible in the short time I think it's also fine to leave it as
it is now.
- The planned energy for the experiment is 2.0 GeV.
- What's already proved is an energy of 2.3 GeV.
One could add a sentence like : Since no parameter depends criticaly on
the energy 2.3 GeV could also be accepted.
Best regards
Frank Brinker
>-----Original Message-----
>From: Calarco [mailto:jrc at einstein.unh.edu]
>Sent: Wednesday, 09 December, 2009 14:40
>To: FWD_kisselev
>Cc: Brinker, Frank; olympus at mit.edu
>Subject: Re: [Olympus] Updated TDR for Friday
>
>
>The obvious solution is to include numbers for both 2.0 and 2.3 GeV
>plus a statement that the ring has been run at 2.3 GeV and while we
>plan to try to run at 2.0, we will accept 2.3 if that is not possible.
>
>Sent from my iPhone
>
>On Dec 9, 2009, at 2:12 AM, Alexander Kisselev
><kisselev at mail.desy.de>
>wrote:
>
>> Dear Frank,
>>
>>> I think, I should remind you, that we have'nt stored beam
>in DORIS at
>>> 2.0 GeV but only at 2.3 GeV. I'm not quite sure that we will be
>>> able to
>>> reduce the energy further while maintaining beam current and
>>> stability.
>>
>> so what would be the proper way to quote the proposed beam
>energy in
>> the TDR? There are now several places in the text where 2.0GeV is
>> mentioned explicitely. In particular on p.16 "we propose to run only
>> at
>> one beam energy, 2.0GeV". In several cases (table 1.2, figure 1.8,
>> synchrotron radiation section, beam life time calculation,
>kinematic
>> range
>> plots, ep-elastic luminosity monitor counting rates) 2.0GeV
>was used
>> to
>> do numerical estimates.
>>
>> Regards,
>> Alexander.
>>
>>> Please be aware of this before fixing any hardware
>sensitive to a 15%
>>> energy change. I guess this might be the case for the
>Moeller/Bahbha
>>> Lumi Monitor, right?
>>>
>>> With my best regards,
>>> Frank Brinker
>>>
>>>> -----Original Message-----
>>>> From: olympus-bounces at mit.edu [mailto:olympus-bounces at mit.edu] On
>>>> Behalf Of Belostotski, Stanislav
>>>> Sent: Tuesday, December 08, 2009 5:42 PM
>>>> To: Richard G Milner
>>>> Cc: olympus at mit.edu
>>>> Subject: Re: [Olympus] Updated TDR for Friday
>>>>
>>>>
>>>> Dear Richard, Grate that things are moving so fast.
>>>> We have prepared 3 pieces which may help drafting additions yet
>>>> missing in TDR:
>>>> ---------------------------------------------------------------
>>>> -------------------------
>>>> MC STUDY OF MOLLER/BHABHA LUMI MONITOR
>>>> ......................................
>>>> Configuration: symmetric ee scattering angle at 2 GeV =
>>>> 1.28deg.=22.3mrad
>>>>
>>>> distance between the IP and front plane of symmetrically
>positioned
>>>> 3x3 counters(shown in figure attached)=300 cm along the beam;
>>>>
>>>> Only central counters of 3x3 counter calorimeter blocks detect
>>>> MOLLER/BHABHA coincedences
>>>>
>>>> @Lumi=2.81 1/cm2sec
>>>> Bhabha coincedence rate(e+e- or e-e+ and gamma*gamma)= 27.1 kHz
>>>> Moller coincedence rate(e-e-) = 55.6 kHz
>>>>
>>>> As an example, distributions of inclusive Bhabha count rate and
>>>> coincidence rate (only charged e, without gamma*gamma) detected by
>>>> the central counters ( @ 3 meters from IP) are shown in figure
>>>> attached (eps and pdf): inclusive count (left panel, red points)
>>>> and coincidence (right panel, blue points), respectively.
>>>>
>>>>
>>>>
>>>> SLOW CONTROL
>>>> ............
>>>> " Successful operation of the OLYMPUS experiment relies,
>in addition
>>>> to the detector electronics, trigger and DAQ, on numerous other
>>>> components which status has to be controlled, monitored and
>>>> recorded.
>>>>
>>>> These include the high voltage for the PMTs and tracking
>chambers,
>>>> low voltage power supplies, the gas system for the
>tracking chambers
>>>> and GEMs, the electron (positron) beam current in the DORIS ring,
>>>> beam offsets and slopes at the OLYMPUS interaction area,
>gas target
>>>> density, toroid magnet current and others.
>>>>
>>>> These diverse components and bits of information will be
>organized
>>>> using Slow Control and Monitoring system similar to the one
>>>> successfully used over years in HERMES experiment at DESY. The
>>>> system will be using MySQL client-server interaction model and
>>>> Tcl/Tk window interface for visualization and online control.
>>>> Collected information will be stored in MySQL database as
>well as in
>>>> the ROOT tree format, readily available for the offline analysis."
>>>>
>>>> BACKUP SOLUTION FOR GEM's 12deg. LUMI MONITOR
>>>> .............................................
>>>> "The absolute measurement of luminosity ratios for electron and
>>>> positron running is very important for OLYMPUS. Independently of
>>>> the additional Bhabha/Moeller monitor installation, Collaboration
>>>> considers a possibility to strengthen
>>>> the already proposed GEM-based 12 degree ep-elastic scattering
>>>> luminosity monitor. An option to interleave GEM modules with
>>>> the three XY 1mm pitch proportional chambers, as well as to
>>>> install scintillating counters with ~100ps timing resolution
>>>> in both arms of the GEM luminosity monitor is presently being
>>>> evaluated."
>>>> ---------------------------------------------------------------
>>>> ---------------------------
>>>> The last item is of course tentative being in process of
>>>> discussion. But it is important for PNPI group that it will be
>>>> at least mentioned in
>>>> TDR. As I understand for the Moscow finance department (and also
>>>> locally in PNPI) it is important that PNPI commitments/
>>>> responsibility
>>>> will be clearly outlined and documented.
>>>>
>>>> Finally, we assume that PNPI commitments/responsibilities
>would be:
>>>> 1.MC studies( MC simulations of Bhabha/Moeller luminosity monitor
>>>> jointly with Frank Maas group, other MC tasks);
>>>> 2.Slow Control ;
>>>> 3.Backup solution for ep scattering luminosity monitor.
>>>>
>>>> With my best regards StanB
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Richard G Milner wrote:
>>>>> Dear OLYMPUS colleagues,
>>>>> I have learned to-day that the DESY Directorate would
>like to give
>>>>> official approval to OLYMPUS at its regular meeting next
>week. They
>>>>> have asked for a revised TDR. I will provide this by the end of
>>>>> this
>>>>> week. I will update the manpower and schedule information. I would
>>>>> also like to include a short description of the symmetric Moller
>>>>> detector, which can be expanded upon later. If you have
>>>> edits that can
>>>>> be incorporated quickly I will do my best to include them. best
>>>>> regards, Richard _______________________________________________
>>>>> Olympus mailing list
>>>>> Olympus at mit.edu
>>>>> http://mailman.mit.edu/mailman/listinfo/olympus
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