Tagger microscope beam test results and readiness for construction what we learned from construction of the prototype and the parasitic beam tests in Hall.

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Presentation transcript:

Tagger microscope beam test results and readiness for construction what we learned from construction of the prototype and the parasitic beam tests in Hall B April 2011 Richard Jones, James McIntyre, Alex Barnes, and Igor Senderovich Alex Somov, Hovanes Egiyan, Jefferson Lab GlueX collaboration meeting, Newport News, Oct. 6-8, 2011

2 Outline Goals Problems Microscope prototype results Revisions to the preamplifier Completed mechanical design Outlook for full detector construction

GlueX collaboration meeting, Newport News, Oct. 6-8, Goals Microscope Prototype Measure the light yield for a high energy electron moving along the axis of a fiber. Measure the TDC time resolution achievable using the UConn preamp, leading edge discriminator, F1TDC. Check the rate dependence (efficiency, time resolution) predicted by our simulation with real data.

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype

GlueX collaboration meeting, Newport News, Oct. 6-8, Problems trigger counters unable to handle rate > 300 kHz unsure of precise alignment wrt bend plane discriminator rates in fibers too low by ~5 DAQ hangs – fixed by D. Abbott in day 5 ! ringing in tail of the SiPM pulses from preamp large cross-talk between channels on preamp discriminator thresholds were higher than ideal key electronics channels failed during later runs issues discovered during offline data analysis issues that arose during online data collection

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype results A B C D E beam’s eye view dispersion direction fiber A1

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype results A B C D E beam’s eye view dispersion direction fiber B1

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype results A B C D E beam’s eye view dispersion direction fiber C1

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype results A B C D E beam’s eye view dispersion direction fiber D1

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype results A B C D E beam’s eye view dispersion direction fiber E1

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope prototype results A B C D E beam’s eye view dispersion direction fiber sum2

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope light yield estimate A B C D E beam’s eye view dispersion direction  gains were not very well matched (  20%)  separate estimates for individual, sum outputs individual outputs mean ph = 600 ch FADC gain = 0.27 mV/ch preamp gain = 0.90 mV/pe average = 360 pe/pulse summed outputs mean ph = 550 ch FADC gain = 0.27 mV/ch preamp gain = 0.85 mV/pe average = 350 pe/pulse consistent results systematic error 10%

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope pulse shape *

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope pulse shape *

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope pulse shape *

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope pulse shape *

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution discriminator threshold FADC pulse height FADC pulse height when TDC fires Why fiber count rates seemed too low wrt the trigger scint.

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution discriminator threshold FADC pulse height FADC pulse height when TDC fires In addition to threshold there is also a problem with efficiency

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution discriminator threshold is below the selection cut FADC pulse height FADC pulse height when TDC fires This channel looks better, but it failed and is missing for 80% of the run period.

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution discriminator threshold is here FADC pulse height FADC pulse height when TDC fires Efficiency looks dubious.

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution discriminator threshold is here FADC pulse height FADC pulse height when TDC fires Efficiency looks dubious. Clear threshold, use this one for timing tests. but

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution 1000 < FADC max < 1050

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution 1100 < FADC max < 1150

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution 1200 < FADC max < 1250

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution 1300 < FADC max < 1350

GlueX collaboration meeting, Newport News, Oct. 6-8, Microscope time resolution design goal (threshold 30%) single-channel 4

GlueX collaboration meeting, Newport News, Oct. 6-8, design goal (threshold 30%) single-channel 4 summed channel 12 Microscope time resolution

GlueX collaboration meeting, Newport News, Oct. 6-8, Preamplifier revisions  Detailed model of preamplifier 1.0 has been written in Matlab  Anomalous features of pulse shapes are reproduced by model. large cross-talk, slow tail for large pulses ringing in the tail of pulses large baseline shifts following each pulse circuit revisions tested in the model, shown to work  Layout completely redone from scratch template provided by Fernando ground flows between long signal traces better isolation between input and output stages reduced channel density impedance matching of outgoing signal traces

GlueX collaboration meeting, Newport News, Oct. 6-8, Preamplifier revisions New layout incorporating Hamamatsu SiPM has been entered into Altium. Another round of prototyping is underway, before final circuit is approved. Bench tests will be sufficient to approve the revised design for production.

GlueX collaboration meeting, Newport News, Oct. 6-8, Completed mechanical design Photon Beam Tagger Microscope (Top View) e - Beam Tagger Magnet

GlueX collaboration meeting, Newport News, Oct. 6-8, Completed mechanical design Back View

GlueX collaboration meeting, Newport News, Oct. 6-8, Completed mechanical design e - View Parallel Railing System SiFi Bundle Array

GlueX collaboration meeting, Newport News, Oct. 6-8, Outlook for microscope construction Major questions regarding performance have been addressed by results of beam test. All issues found in generation 1 electronics prototypes have been understood and addressed by engineering changes. including bench tests at maximum expected pulse rates, One more round of prototyping of electronics is needed, including bench tests at maximum expected pulse rates, before final production can begin. Mechanical design of microscope is essentially complete. All elements are now in place for executing a Construction MOU for the tagger microscope. All elements are now in place for executing a Construction MOU for the tagger microscope.