1 TOF Aging Issues Pre-history Operating history Observations related to gain loss Impact on timing resolution Possible courses of action April 6, 2006.

Slides:



Advertisements
Similar presentations
1 Electronics Simulation in the Photon Transport Monte Carlo Preamp model Receiver/discriminator circuit CAFÉ driver circuit model Examples Summary January.
Advertisements

MWPC Commissioning: A Status Report What the MWPC’s do and how Data taking Jan-Feb 2000 Results from the Analysis.
Frank Geurts Rice University.  Time-of-Flight in STAR ◦ start & stop detectors in Run 9  Time-of-Flight Calibration ◦ upVPD ◦ Barrel TOF ◦ preliminary.
Time-of-Flight at CDF Matthew Jones August 19, 2004.
29 June 2004Paul Dauncey1 ECAL Readout Tests Paul Dauncey For the CALICE-UK electronics group A. Baird, D. Bowerman, P. Dauncey, C. Fry, R. Halsall, M.
Veto Wall Test Hyupwoo Lee MINERvA/Jupiter Group Meeting Feb, 13, 2008.
20 Feb 2002Readout electronics1 Status of the readout design Paul Dauncey Imperial College Outline: Basic concept Features of proposal VFE interface issues.
Calibration of the 10inch PMT for IceCube Experiment 03UM1106 Kazuhiro Fujimoto A thesis submitted in partial fulfillment of the requirements of the degree.
Y. Karadzhov MICE Video Conference Thu April 9 Slide 1 Absolute Time Calibration Method General description of the TOF DAQ setup For the TOF Data Acquisition.
Increasing Field Integral between Velo and TT S. Blusk Sept 02, 2009 SU Group Meeting.
Veto Wall Test Hyupwoo Lee MINERvA/Jupiter Group Meeting Apr, 16, 2008.
Forward Detectors and Measurement of Proton-Antiproton Collision Rates by Zachary Einzig, Mentor Michele Gallinaro INTRODUCTION THE DETECTORS EXPERIMENTAL.
Scintillation Detectors
The Time-of-Flight system of the PAMELA experiment: in-flight performances. Rita Carbone INFN and University of Napoli RICAP ’07, Rome,
November 1999Rick Field - Run 2 Workshop1 We are working on this! “Min-Bias” Physics: Jet Evolution & Event Shapes  Study the CDF “min-bias” data with.
RF background, analysis of MTA data & implications for MICE Rikard Sandström, Geneva University MICE Collaboration Meeting – Analysis session, October.
The Transverse detector is made of an array of 256 scintillating fibers coupled to Avalanche PhotoDiodes (APD). The small size of the fibers (5X5mm) results.
Performance test of STS demonstrators Anton Lymanets 15 th CBM collaboration meeting, April 12 th, 2010.
1 TOF Aging Discussion Background information Summary of results so far Examples of gain loss mechanisms Diagnostics Possible scenarios for 2006 Discussion.
Chamber parameters that we can modify and that affect the rising time Number of ionisation clusters produced in the drift gap: Poisson Distribution Probability.
Tests with JT0623 & JT0947 at Indiana University Nagoya PMT database test results for JT0623 at 3220V: This tube has somewhat higher than usual gain. 5×10.
Cube Measurements Tent Crew. Scintillation BNL 241 Am Semi- collimated  Spectralon Diffuse UV Reflector SBD  -Trigger Scint. Light Poisson.
Current Status of Hadron Analysis Introduction Hadron PID by PHENIX-TOF  Current status of charged hadron PID  CGL and track projection point on TOF.
LHCC, V0, Sept The V0 detector (Mexico Lyon collaboration)  Segmentation  Simulated performances secondaries / beam-gas  Counters design 1 /
14/02/2007 Paolo Walter Cattaneo 1 1.Trigger analysis 2.Muon rate 3.Q distribution 4.Baseline 5.Pulse shape 6.Z measurement 7.Att measurement OUTLINE.
Oct C. Smith - PCAL/EC Commissioning 1 PCAL/EC Commissioning Document
Feb 10, 2005 S. Kahn -- Pid Detectors in G4MicePage 1 Pid Detector Implementation in G4Mice Steve Kahn Brookhaven National Lab 10 Feb 2005.
CM26 March 2010Slide 1 EMR Status o Intro o Construction o Magnetic shielding o Electronics o Prototype Cosmics test o Schedule Jean-Sebastien Graulich,
Status of TPC experiment ---- Online & Offline M. Niiyama H. Fujimura D.S. Ahn W.C. Chang.
Thomas Jefferson National Accelerator Facility Page 1 EC / PCAL ENERGY CALIBRATION Cole Smith UVA PCAL EC Outline Why 2 calorimeters? Requirements Using.
1 CPC2-CPR2 Assemblies Testing Status Tim Woolliscroft.
March 12, 2006R. Abrams LCWS06 Bangalore1 ILC Prototype Muon Scintillation Counter Tests Robert Abrams Indiana University.
Start Counter Collaboration Meeting September 2004 W. Boeglin FIU.
MPPC Measurements at LSU Brandon Hartfiel LSU Hardware Group Thomas Kutter, Jessica Brinson, Jason Goon, Jinmeng Liu, Jaroslaw Nowak Sam Reid January 2009.
Hongyu Fu, Trigger group The Monte Carlo for Trigger Design of BES3 Scintillating Fibre BEMC Outline: Introduction to BES3 Scin-fibre BEMC Trigger.
Frank Geurts Rice University.  Time-of-Flight in STAR ◦ start & stop detectors in Run 9  Time-of-Flight Calibration ◦ upVPD ◦ barrel TOF ◦ preliminary.
BigCal Reconstruction and Elastic Event Selection for GEp-III Andrew Puckett, MIT on behalf of the GEp-III Collaboration.
Background Subtraction and Likelihood Method of Analysis: First Attempt Jose Benitez 6/26/2006.
The 21st International Conference on Ultrarelativistic nucleus-nucleus collisions, March 30 – April 4, Knoxville, TN Results from cosmics and First LHC.
TELL1 high rate Birmingham Karim Massri University of Birmingham CEDAR WG Meeting – CERN – 26/03/2012.
Cosmic Ray Workshop May 15, Cosmic Ray Detector Kit.
Frank L. H. WolfsDepartment of Physics and Astronomy, University of Rochester Status of the TOF February 22, 2001 Straight-line tracking What have we learned?
Test beam preliminary results D. Di Filippo, P. Massarotti, T. Spadaro.
KEK Test Beam Phase I (May 2005) Makoto Yoshida Osaka Univ. MICE-FT Daresbury Aug 30th, 2005.
Production PMT Testing and Work on Site with Prototype Tank University of California, Los Angles Department of Physics and Astronomy
1 Calorimeters LED control LHCb CALO meeting Anatoli Konoplyannikov /ITEP/ Status of the calorimeters LV power supply and ECS control Status of.
UM PPS Lab Activities Mid-size Panel Tests PPS meeting January 15, 2012 Claudio, Curtis, Dan, Ethan, Riley.
Muons at CalDet Introduction Track Finder Package ADC Corrections Drift Points Path Length Attenuation Strip-to-Strip Calibration Scintillator Response.
Development of a pad interpolation algorithm using charge-sharing.
PMT time offset calibration (not completed) R.Sawada 27/Dec/2007.
Photon Transport Monte Carlo September 27, 2004 Matthew Jones/Riei IshizikiPurdue University Overview Physical processes PMT and electronics response Some.
Siena, May A.Tonazzo –Performance of ATLAS MDT chambers /1 Performance of BIL tracking chambers for the ATLAS muon spectrometer A.Baroncelli,
A. Tsirigotis Hellenic Open University N eutrino E xtended S ubmarine T elescope with O ceanographic R esearch Reconstruction, Background Rejection Tools.
E. Picatoste, D. Gascon PMT afterpulsing and SPD trigger 1 Looking to the problem from the instrumentation point of view LHCb Calorimeter Meeting – CERN.
Evelyn Thomson Ohio State University Page 1 XFT Status CDF Trigger Workshop, 17 August 2000 l XFT Hardware status l XFT Integration tests at B0, including:
1 XCAL LED quality check and time alignment consideration CALO meeting Anatoli Konoplyannikov [ITEP / LAPP] Outline  CALO sub-detector status.
Preliminary results from the attenuation scans in BGO crystal. 1 F.Lacava CERN
Proposal for the after-pulse effect suppression  Observation of pulses and after-pulses  Shape measurement  Algorithm  Results  Efficiencies for after-pulse.
Beam detectors in Au+Au run and future developments - Results of Aug 2012 Au+Au test – radiation damage - scCVD diamond detector with strip metalization.
Faculty of Physics, University of Belgrade Collaboration meeting, Dubna 8 th of April, ToF-LR Upgrade Jovan Puzović, Faculty of Physics, Belgrade.
June 4, 2009 STAR TPC review Estimation of TPC Aging Based on dE/dx Measurements Yuri Fisyak.
1 TOF Performance By: Bradford Cannon Florida State University GlueX Collaboration Meeting October 9, 2015.
Feb C.Smith UVA EC energy calibration – g13 pass0 For pass0 data were cooked with CALDB calibration constants reset to nominal 10 channels / MeV.
Fabio, Francesco, Francesco and Nicola INFN and University Bari
Upgrade of the scintillator testing station in Prague
BNL electronics: first tests
PCAL Cosmic Ray Tests Progress Report C. Smith μ U V W MODULE 2
Slice Test: Preliminary Data Analysis The Ohio State University
Status of the TOF Detector
Particle ID Diagnostics in the MICE Beamline
Presentation transcript:

1 TOF Aging Issues Pre-history Operating history Observations related to gain loss Impact on timing resolution Possible courses of action April 6, 2006 Matthew JonesPurdue University

2 Pre-history – Before installation We knew that PMT response degrades with time: Belle’s experience suggested this might be worse in a magnetic field.

3 Pre-history – Before installation CDF Note 5358 – Estimated maximum anode current expected in Run-IIa:CDF Note 5358 The light acceptance parameter, ε, was measured in a cosmic ray experiment... Also assumed: σ min-bias =68 mbarn L = 2x10 32 cm -2 s -1

4 Pre-history – Before installation Wide range of S k and G(V). We were always conservative: Most PMT’s would operate at less than 10 μA with G=5x10 4. Found we could operate at 3x10 4. Some outliers

5 Pre-history – before installation An observed loss of gain is not necessarily associated with the PMT’s themselves... Scintillator aging: –CLEO and CMP scintillator went yellow. –Expect this to happen eventually. –Does not appear to be related to radiation damage. Other optical components: –OPAL had to replaced their cookies because they went opaque (Sn vs Pt catalyst?)

6 Operating Parameters High Voltage: –Specified in file on the TOF HV PC –Downloaded to CAEN SY527 modules Discriminator thresholds: –Set by 8-bit DAC’s on TOMAIN board –Configurable by hardware database ADC gate width: –ADC integrates charge while a gate is asserted following discriminator firing –Configurable by hardware database COULD INFLUENCE AGING DON’T INFLUENCE AGING

7 Operating History Run – one of the first with TOF –HV set to give “nominal” gain of 5x10 4 –Gain equalization studies by Koji and Gerry Sept 2, 2001 – Nominal gain set to 3x10 4 Sept 6, 2001 – Disc. threshold scans –Set to 15 mV for all subsequent running March, 2002 – Gate width scans –ran with 21 ns until Sept 2003 –subsequently ran with 13 ns Dec, 2004 – Increased HV on 2 channels –These frequently showed up in the tails of distributions associated with calibrations

8 ADC response history First studied by Koji/Fumi/Gerry (CDF Note 6003) Gain degradation effects were subtle –Only studied by averaging over all channels –Difficult to rule out luminosity dependence Possibly observed a decrease in ADC response as a function of time –Can’t find the plots that demonstrate this

9 History Plots Model for ADC response: Determine parameters for each channel using un-binned likelihood fit Values depend on how well the model describes the data: –Not simple exponential attenuation –Q 0 is Landau distributed –Need to know (or account for) path length in the scintillator

10 ADC Response Note 6948 – ADC response fit: Tracks that clip the corner of a bar Landau function Q 0 e -d/ Λ part divided out

11 Mean of ADC response distribution Changes to gate width Attenuation length approximately constant? 20% loss over ~1 year

12 More recent studies (June 2005) Not obvious how to relate ADC response to performance We don’t even sample the ADC if the discriminator doesn’t fire (introduces bias) Difficult to relate this to a loss of efficiency Also related: alignment of TOF scintillator –Did it ever move after the initial survey? These issues addressed in CDF Note 7693.CDF Note 7693

13 Model for Hit Bars First studied in late 2002: –Plot the track segments when bar is not hit: –This analysis finds where the corners are.

14 Model for Hit Bars Construct the likelihood function: Landau distribution

15 Hit bar analysis Results of the fit: –Alignment parameters (useful, but not necessarily for this study) –Minimum path length in scintillator needed to fire the discriminator –Path length resolution (might tell us something useful) All are determined as a function of z Directly relates minimum path length to the discriminator threshold (15 mV) Quantifies loss of efficiency

16 Channel 5: one that ages gracefully. Minimal path length study

17 Channel 221: one that does not. Minimal path length study Near end Far end

18 Evolution of l min for PMT’s on Bar 5 Ch. 5 Ch. 221 Constant slope would suggest no change in the “attenuation length”...

19 Evolution of l min (all channels) Not dominated by changes in attenuation length. In more recent data, l min exceeds thickness of the scintillator for some channels.

20 What Property of the PMT’s Causes This? Several parameters are somewhat correlated... They can change dramatically and unpredictably in a magnetic field. Strongest correlation seems to be with HV: Interesting... But this does not imply causality.

21 Gain loss vs PMT serial number Assumes that serial numbers correlate to manufacturing date (probably reasonable). Wow!

22 What about timing resolution? “Timing resolution” has been defined in several ways: –Using J/ψ  μ + μ - or K 0 S  π + π - events –Using D *+  D 0 π + : low statistics but still useful –Low momentum particles: needs ad-hoc corrections at low momentum All are useful “indicators” of timing resolution performance All distributions have two components and non- Gaussian tails, some are worse than others. Careful: using a single parameter to quantify timing resolution might not necessarily tell the whole story...

23 Timing resolution history Fit all particle components using double Gaussian Time evolution of narrow Gaussian width:

24 Effect on timing resolution Presumably affects time slewing correction –At threshold, corrections are very large –Shape of pulse depends strongly on z –Parameterization needs to describe shape of pulse over a very large range of amplitudes Significant z-dependence could affect the performance of the calibration procedure

25 Possible Courses of Action Do nothing and suffer efficiency loss and degraded timing resolution Turn up the HV: might accelerate the aging? Or maybe it wouldn’t... Replace PMT’s? Probably too many need to be replaced to make an impact. Attach amplifiers between ends of cable and front end electronics? Others?

26 Conclusions The PMT’s in the TOF system are losing gain as the run progresses –Presumably depends on integrated luminosity but still need to check this explicitly Mechanism still a bit unclear –Degradation in later dynode stages –Related to PMT manufacturing Obvious loss of efficiency in many channels –Changes particle dependent efficiencies? Effect on timing resolution –Can we calibrate out some of this? What can we do about it? Probably something...