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Status and organization of the H8c area
Mirko Berretti08/07/2015
(with M.Bozzo, N.Minafra, E.Oliveri, X. Pons…)
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Summer TBs: infrastructures overview
Remote movable table in X-Y. sxy=0.1mm but X movement will
be provided by the RP motor.
Remote movable table in XY direction: sxy=0.1mm
TOTEM Timing
CT-PPS Timing
Tracker externally triggered by Scint-1 and Scint-2 (pairs of scintillators,
trigger area ∼2cm x 2cm)
Scint-2Scint-1
H8 setup:
• Diamonds/quartz X-movement provided by the RP movement system (from the CR, 5mm step).
• Diamonds/quartz Y-movement provided by the table (from the CR, 0.1 mm resolution/step).
SPS beam: • E=180 GeV protons• Divergence: 40-250 mrad• Rate 5-10KHz/cm2/spill
Timing detector movement:
Tracker: 3 triple GEM planes, 70 mm hit resolution/plane(thanks to E. Oliveri, RD51)
Eventual time reference or/and additional coincidence
to the scintillator / trig out (min. area ∼ 1mm2)
∼ 20 cm min distance,due to the tracker frame currently ∼2m
distance,can be varied
Trig-OUT
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RP movement status
• Desy table installed, the movement control was already tested form the CR.
• Expected movement reproducibility < 0.1mm, will be tested with particles in the next parasitic beam.
• Motors connected to the racks, movement tested from inside
the experimental area.
• Movement control expected to be transferred in the CR this week, reproducibility ∼5 mm.
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• Many thanks to E. Oliveri and to RD51.
• GEM tracker: gas system in H8 tested, small leakage to be fixed/better quantified.
• External NIM trigger-IN (now with 10cmx10cm scintillators) and NIM trigger-OUT.
• Acquisition window small enough to avoid any pile-up issue
with our rate H8c.
• Should perform well up to 1KHz, rate can be increased by a factor 4 by reducing the sensitive area (so the number of RO chips) to 3cmx3cm.
• Asked a proper table to adapt the frame tracker to the beam height in H8 (we should have before the 15th July).
Tracker status
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• Support/Training for the tracker acquisition until August (Magdlena/Finland).
• Important: DAQ system already tested by RD52, root file with tracks/clusters, alignment sw already available.
• Important: trigger out tested at few hundreds Hz, only event that are saved generated a trigger out (very useful for synchronization of our devices with the tracker).
• Available in H8 from 15th July.
Tracker status
Chamber 1-2
Chamber 3
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H8 beam measurements• Counts per spill as recorded by the wire chamber at the entrance of
our area (X-scale in mm).
• Final optics focusing on the RP used.
• ∼1 cm beam width.
• 10 KHz rate in 2 cm x 2 cm per spill. Vertical profile
Horizontal profile
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H8c time reference (diamonds) • Attempt for a time reference based on diamonds. • Copper bar (30 cm length) was put in front of the
diamond to get showers and increase the signal (time resolution improvement)
NB: no effort spent to work on better algorithms (no time walk correction on saturated signal)
<s>=90 ps (1 particle)
<s>=70 ps (2 particles?)
<s> < 40 ps (>2particles?)
Strip Pulse Height
Two diamonds planes
Copper bar
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H8c time reference (diamonds)Showers create 15% of triggers with saturated signal both in the front and in the rear diamond
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H8c time reference (diamonds)
TStrip1-TPlain TStrip2-TPlain
Two diamond strips available, each one with sT < 40 ps, combined measurement expected to be in the range of sT = 25-30 ps.
DT (ns) DT (ns)
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Conclusions
• RP installed, movement system almost ready to be used from the CR.
• First measurements to estimate the beam size and the trigger rate with the final optics.
• Tracker available from 15th July, its trigger out can be used for synchronization with the timing detectors for efficiency and cross talk measurements.
• Timing reference based on showering protons in the strip diamonds should provide a 25-30 ps time resolution.