Ed Brash
will setup an HallAThirdArm mailing list.There are various ideas in the community for additional detectors in hall-community which are fed by the wish to detect other particles than only protons or to measure more exclusively, i.e (e,e'gammagamma), (e,e'n) and (e,e'pp). Each of these potential experiments has its own requirements on scattering angle, distance to the target, energy of particle to be detected etc. On the other hand it is clear that this third arm will in general determine the luminosity at which the planned experiment can take place. During the discussion we have looked for common points of interest. Below follow the agreements that have been made.
Ed Brash
will setup an HallAThirdArm mailing list.
** note from Ed: You can send a message to everyone on this list by sending it to third_arm@lafite.phys.uregina.ca
The following detectors are candidate to be tested (all dimensions are
given as height x width x depth and in cm's):
Lead glass blocks as discussed by Bogdan Wojtsekhowski (4x4x30 cm^3).
BC420 blocks as discussed by Bill Hersman. There will be 2 options:
18x18x60 and 10x10x60 cm^3.
scintillator blocks as discussed by Eli Piasetzki (30x10x12.5 cm^3).
HADRON2 detector, partly equipped with PMTs. Sizes of scintillators
range from 16x1x0.5 to 40x7x7 cm^3. Some shielding is given by the Pb
and Fe of the surrounding box.
The following 6 persons have agreed to play an active role. This HATA task
force consists of Ed Brash, Shalev Gilad, Bill Hersman, Eddy Jans, Richard
Lindgren and Bogdan Wojtsekhowski.
** note from Ed: You can send a message to these six people by sending it to task_force@lafite.phys.uregina.ca
It was agreed upon that those who are interested in obtaining certain
count rates should specify their favorite experimental conditions like
angle, absorber, threshold, distance to the target etc., and mail this
to Ed Brash before November 24.
Ed Brash will make an inventory of the proposed tests and mail this around.
Pavel Degtiarenko will make then predictions for the one or two tests we
decide to start with.
A system should be set up that contains electronics and DAQ + analysis
software, such that HVs and thresholds can be set, ADC and TDC information
can be obtained. Spectra must be produced, cuts be set etc. Also scaler
information must be easily obtainable. In this way we will be able to
investigate parasitically the response of some detectors while
two-spectrometer experiments are running in hall A. Next some specific
dedicated tests being the main user can in principle be scheduled.
Looking forward to a pleasant and fruitful collaboration,
greetings,
eddy jans
To Third Arm Working Group Home Page
Send comments to: Richard Lindgren
,
ral5q@virginia.edu