Download - 16 DC’s on the support !!
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DC status, 18.07.2007, je 1
16 DC’s on the support !!
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DC status, 18.07.2007, je 2
4 Levels of test
1. Pretest HV Air + tightness
2. Aquarium : functionality + tightness
3. Cosmics Lab : other preamps + correct signal assignment inside COBRA up to panel== preamp calibration
4. Cosmics E5, with and without COBRA== preamp calibration + alignment
17 DC‘s through level 2 + 13 DC‘s through level 3 + 3 DC’s partially level 3
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DC status, 18.07.2007, je 3
Tightness
a) Clean old pair with He
b) New DC pair in
c) Flush with 50%-50%
HV in pure He (Aquarium closed)
• As above
• Flush He in Aquarium
• Open Aquarium
49.5%
48.6 %
~1 %
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DC status, 18.07.2007, je 4
Sr90 , slits of > 5 cm
a) All signals present (anode asymmetry only if up and down)
b) Circle only with 4 correct cathodes
c) separation of 2 periods
Assy cath up
Assy cath down
Assy anodes
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DC status, 18.07.2007, je 5
Calibration
AsyAn0 = [{(l/2+x)r + R} - {(l/2-x)r + R}] / [{(l/2+x)r + R} +{(l/2-x)r + R}]
= 2x / ( l + R/r)
AsyCat/(sum anode) = a+bsin(2*pix/period + phase)
DC geometry Ok to +-.05 mm
Iteratively : a) Project with and optimize ratio of anode preamp gain or thin slit in the middle
b) Fit cathn /(sum Anode)
Clever fit like Boris and Sacha
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DC status, 18.07.2007, je 6
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DC status, 18.07.2007, je 7
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DC status, 18.07.2007, je 8
DC test with Cosmic ray (in Lab.)
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DC status, 18.07.2007, je 9
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DC status, 18.07.2007, je 10
cosmic ray counters for DC wire alignment• 10 counters (10 plastic scintillators + 20 PMTs) are prepared
• DC wire alignment will be performed w/o COBRA field
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DC status, 18.07.2007, je 11
•event rate is estimated by MC
•beyond hit rate map is corresponding to 5 hours running
•“1 counter hit & 2 DC hit” are required
•if we request 10k tracks for 1 wire at least, 90 hours are necessary
cosmic ray counter for DC wire alignment (2)
# o
f hit
/ 5
hours
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DC status, 18.07.2007, je 12
cosmic ray in the COBRA field• event examples
μ+ : 746MeV/c μ- : 607MeV/c
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DC status, 18.07.2007, je 13
DC trigger (Michel)== energy and resolution calib.
01
23
45
67
8
910
11
12
13
14
15
16
17
•optional trigger :
(1)standard trigger + 1 hit in the “outer sector”
(2)standard trigger + TC hit (bar & fibre)
inner
outer
e+
The definition of the standard Michel trigger :just requiring the # of hit sector ≥ 4 , does NOT care “inner/outer”
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DC status, 18.07.2007, je 14
momentum spectra (standard trigger)
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DC status, 18.07.2007, je 15
momentum spectra (optional trigger)
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DC status, 18.07.2007, je 16
Control of DC geometry
a) 2 print crosses measured relative to reference bolts in mech. Workshop
b) Same in COBRA by survey group
• On the platform
• Without end cap
• (next days !)
• Without COBRA
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DC status, 18.07.2007, je 17
photos
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DC status, 18.07.2007, je 18
photos
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DC status, 18.07.2007, je 19
Backgrounds
a) HV units, disappear with linear regulator for low supply
b) “Front end program” not polling but online time calibration
c) Up-down negligible with better up-down print grounding
• print ground to metallic cover of Carbon support
• Al contact between frames from up support to down support
d) Rate (temperature) dependence of DRS calibration next Chip
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DC status, 18.07.2007, je 20
Data reduction
reject cells
a) peak to peak of anode sum < 2*threshold in time window
b) 2 neighbors with peak to peak of anode sum < 2*threshold in time window
Data reduction with limit on peak to peak [cosmic]
0
0.2
0.4
0.6
0.8
1
1.2
0 20 40 60 80 100 120
4a/trigger[%]
4A+4B)/trigger[%]
datasize/event/DC[%] 115 kB at 0
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DC status, 18.07.2007, je 21
Second optimistic migration possibility to COBRA : today
Realistic migration to COBRA : Thursday, Friday
Aquarium
a) flushing gas (5 hours) + HV (last 3 hours of gas flushing)
b) measurement and analysis (2 hours )
c) flush He in Aquarium (3 hours)
d) eventually measurement and analysis( 2 Hours)
total of 12 Hours
Support
a) flushing gas (7 hours) + HV (last <3 hours of gas flushing)
b) measurement and analysis of previous run (3-6 hours 40000 events)
c) change connection and cosmic Scintillator position(1 hour)
Total of 11 hours for the first after Aquarium run, < 7 hours for the others ( without repair)
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DC status, 18.07.2007, je 22
1. Finish testing on support
2. Transport and insert in COBRA
3. Measure geometry by survey group
4. Cabling in E5 2 days
5. Test DAQ complete system
6. Cosmic without COBRA field (alignment)
7. Cosmic with COBRA field (when COBRA on)
> 4 working days
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DC status, 18.07.2007, je 23
End
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DC status, 18.07.2007, je 24
photos
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DC status, 18.07.2007, je 25
photos