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T958!
• Fermilab Test beam experiment to study fast timing counters for FP420
• MOU between UTA, Alberta, Louvain, Fermilab (Brandt spokesman)
• Data taking scheduled July 24-31…
FP420 Collab meetingCERNSep. 29, 2006
Collaboration
• UTA coordinating, providing grad student for summer at Fermilab for DAQ/readout integration, also simulations, Fused Silica, connectors, detector holders, Burle interface, electronics modules for test beam, etc.
• Alberta providing air light guides, electronics expertise, cables, simulations
• Louvain providing Gastof prototypes, amplifiers, cables, connectors, electronics expertise
• Fermilab providing test beam and support (and Mike!)
Critical Issues (all converged)1) ORC (electrical safety) Andrew gas safety (Mike).
2) Gas (Mike discovered Octafluorotetrahydrofuran! C4F80 replacement for banned C4F10 (can use latter, but $10k for a bottle!). Now need to get gas out of bottle…
3) Support stand (tech support from Fermilab)
4) Air light guides
5) UTA Quartic mounting box
5) Readout integration, tracking
6) Fermi Id’s, safety training
7) All parts (including PMT’s to Fermi)
T958 Personnel and Running PeriodFermi Personnel for July setup and run
Albrow
Brandt Pedro (GRA)
Luc (EE)Tomasz+Pierre (Post-doc+GRA)
Lars+John (EE)
But beam goes off unexpectedly July 21- Aug 11!!!
Sporadic mostly parasitic running Aug 12- Sep 14
(primary user Sep 7-10, 14)
Darn near kills Mike and me (heroic effort by Mike as only FNAL person): AGB at Fermi July 17-27, Aug 1-3, 13-16, 28-31, Sep. 1-3, 6-9, 13-14Arranged additional help from Tomasz, Lars+Len, UTA studentsSpurlock, Pal, Roy, post-doc Duncan Brown
Burle 8x8 MCP-PMT ADC (LeCroy 2249A)
Amplifier :HamamatsuOrtecPhillips
Constant Fraction DiscriminatorOrtec 934(9307)
TDC(Phillips 7186)
T958 Electronics
SMA
NIM Trigger, CAMAC DAQ,in parallel tracking with MWPC
SMA
Lemo
GASTOF Prototype
To be released from customs today!
http://www.fynu.ucl.ac.be/themes/he/ggamma/Cherenkov/
7.62 cm
2.54 cm2.54 cm
9.0 cm
3.7 cm
4.7 cm
1.53
cm
1.01
cm
2.54
cm
50º2.57
cm
4.82cm
6.4 cm
*red line shows where beam should be 1.97 cm vertically below top of box*green line show where we started 3*magenta line shows whereCENTER of beam hits tube
1.97cm
Where isthe beam?!
top view
double peakseparated by ~1.2 nsec characteristic of poorly tunedCFD
2300 V
2500 V
G2- a Q2channel
CFD 934 -> 9307 kills second peak
for a (previously)
bad Q channel
Questions
• Why G not better than it is?• Why G so much better than Q? (G is intrinsically faster, but expected to be dominated by electronics) 90 vs 130 ps implies another 90 ps resolution term unique for Q (right now, I can only account for 40 ps)!
Timing Resolution Components
Detector specific: • G~2 ps, Q has other contributions: color dispersion (20
ps), position dependence (25 ps), number of pe’s (25 ps)
Common:• PMT (50 psec single pe at max gain;30 for 10 um)• Amplifier/attenuator (actually different)• CFD (not all same)• TDC • CABLES/CONNECTORS (not all same)
Tracking (hot of press)
x (mm)
y (m
m)
6 mm
15 mm
x (mm)
y (m
m)tracks projected to Q1 valid time in one Q1 bar
30 mm
25 mm
beam “center”10x15 mm
Overflows Operating in common stop mode, if a start arrives with no stop in next 100 ns it
gives overflow when next stop comes Overflows: occurred at an unacceptable level
are bad cause no info on channel—don’t know wheter or not it had a valid time depend on trigger, tighter trigger worse-> more likely proton starts a channel, but doesn’t give stop
hamper ability to measure efficiency
*Need to improve this for next run
How to Proceed
• Learned a lot (still learning) but MANY questions have to be answered before we are convinced we have a viable detector
• Need better alignment, tracking, electronics, DAQ, analysis,
management, etc.• Starting to plan for next test beam (Jan 10?, later?), {some cosmics in mean
time?}