[Olympus] Background situation at DORIS

[frullani@iss.infn.it]

Dear Frank,
thank you for the information.
One comment and one request.
Comment: if measurements are taken with different detector systems (in the
photo a rather big volume ionization chamber in position D is shown and
you mention also TLD that are usually much more small) and in the area
there is a large radiation field gradient we could have difficulties in
interpreting the measurements. Our problem is radiation field in a small
area (the size of electronics chips) and we need information of the
highest possible field during normal condition operation mediated in
volumes of this size.
Question: have the measurements been taken for a long enough period to be
considered representative of a normal operation situation ? Have been in
that period some beam losts and other possible peculiar but normally
occurring  situations that are at origin of higher radiation field?
In conclusion if we are confident that 10 or 100 Gray/day is a
representative number we can start to think with this numbers in mind a
consider a 3 months period. If not, with possibility that these number
must be revisited going significatively higher or lower, we have to
investigate the problem of measurements more deeply.
This is all for the moment.
Have a good day of work, and not only ..
Salvatore
> Dear collegues,
> I got now the measurements from our RF group. They installed radiation
> detectors and TLDs under the beam pipe in the RF straight behind the
> last dipole at different positions.
> Attached you'll find the dosis rates and the positions. Plotted is the
> log of the rates, since they are surprisingly different by several
> orders of magnitude.
>
> Best regards,
> Frank
>
>>-----Original Message-----
>>From: olympus-bounces at mit.edu [mailto:olympus-bounces at mit.edu]
>>On Behalf Of frullani at iss.infn.it
>>Sent: Monday, September 27, 2010 9:42 AM
>>To: Alexander Winnebeck
>>Cc: olympus at mit.edu
>>Subject: Re: [Olympus] Background situation at DORIS
>>
>>
>>Thank you Alexander,
>>for very informative measurements.
>>Would be possible during the foreseen next measurements to put
>>also, with help of DESY radiprotection group, some TLD (or
>>similar devices) chips to have a measuremnt of radiation field
>>integrated over time in Gray ? This would allow a quantitative
>>appreciation of the hardness level needed for the electronics
>>near the interaction point. Thanks a lot. Salvatore
>>> Dear colleagues,
>>>
>>> attached you can find some results of the background measurements at
>>> DORIS in the future interaction region of OLYMPUS. I could
>>learn that
>>> we don't need to have fear of the beam injection at DORIS, but beam
>>> losses are an issue. Thanks to Juergen, who helped me to install the
>>> detectors, Philipp for supporting a DAQ, and Frank for giving me
>>> access to the DORIS data base.
>>>
>>>
>>> Best regards,
>>>
>>> Alexander
>>>
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