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1 Searching for the QGT: Quantum Efficiency Gain Transparency TK Hemmick for the HBD Crew
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1 Searching for the QGT: Quantum Efficiency Gain Transparency TK Hemmick for the HBD Crew.

Dec 28, 2015

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  • Searching for the QGT:

    Quantum EfficiencyGainTransparencyTK Hemmick for the HBD Crew

  • OverviewHBD Prototype StatusQE; Gain; TransparencyElectronicsPreliminary Run PlanDelivery; Cuddy TestsZero Field; +/- FieldHBD Construction StatusVessel; PCB; Glove Box

  • Summary in Brief: Quantum Efficiency.The GEM was evaporated on Monday April 3The Local QE test looks basically normal (a bit above average)Flash Lamp tests same today as initial installation:April 6: 475 mV in CF4 (only 6.7 turns of detector)April 10: 514 mV in CF4

  • Summary in Brief: GainA number of gain curves were taken prior to replacing the grid.One anomalous low-gain scan was seen (detail later)

    With grid replaced and operating via a resistor chain the SUPER WEAK source still shows 55Fe peak.Present State

    Chart2

    3329.741284403728240.0807339455100.77127339451594.76609174312928.7725275229

    4731.737614678928982.53027522947368.22237431192191.33489908264247.3897752294

    6767.32844036729320.007339449510277.06402568812989.81930275236156.6376651376

    9449.994495412829792.475229357815317.85173211013962.68535779828615.3094082569

    12981.946788990829765.477064220219699.18154862395311.848660550512275.8458302752

    18116.946788990833167.245871559618443.50145688077230.046825688114452.9378486239

    24082.363302752319780.484576146810084.3991192661

    17323.326411009213507.7862752294

    19383.0031082569

    16838.7603669725

    50ohm Trial 1

    50 ohm chrge sat

    1Mohm Trial 2 (1Hr later)

    1Mohm_trial 3 (HV OFF, 3 hrs later)

    Trial 4: 4/6/2006

    DeltaV(Foil) [V]

    Absolute Gain

    HBD Prototype GEM Gain

    Sheet1

    Mesh2200240026002800300032003400360038004000200036003800270028002900300031003200330034003500360037003630

    *GAP*141.1764705882154.0106951872166.8449197861179.679144385192.513368984205.3475935829218.1818181818231.0160427807243.8502673797256.6844919786128.3422459893231.0160427807243.8502673797173.2620320856179.679144385186.0962566845192.513368984198.9304812834205.3475935829211.7647058824218.1818181818224.5989304813231.0160427807237.4331550802232.9411764706

    G1-U0.9358288772058.82352941182245.98930481282433.15508021392620.3208556152807.4866310162994.65240641713181.81818181823368.98395721923556.14973262033743.31550802141871.65775401073368.98395721923556.14973262032526.73796791442620.3208556152713.90374331552807.4866310162901.06951871662994.65240641713088.23529411763181.81818181823275.40106951873368.98395721923462.56684491983397.0588235294

    G1-L0.80213903741764.70588235291925.13368983962085.56149732622245.98930481282406.41711229952566.84491978612727.27272727272887.70053475943048.1283422463208.55614973261604.27807486632887.70053475943048.1283422462165.77540106952245.98930481282326.20320855622406.41711229952486.63101604282566.84491978612647.05882352942727.27272727272807.4866310162887.70053475942967.91443850272911.7647058824

    DG1294.1176470588320.8556149733347.5935828877374.3315508021401.0695187166427.807486631454.5454545455481.2834224599508.0213903743534.7593582888267.3796791444481.2834224599508.0213903743360.9625668449374.3315508021387.7005347594401.0695187166414.4385026738427.807486631441.1764705882454.5454545455467.9144385027481.2834224599494.6524064171485.2941176471

    *GAP*294.1176470588320.8556149733347.5935828877374.3315508021401.0695187166427.807486631454.5454545455481.2834224599508.0213903743534.7593582888267.3796791444481.2834224599508.0213903743360.9625668449374.3315508021387.7005347594401.0695187166414.4385026738427.807486631441.1764705882454.5454545455467.9144385027481.2834224599494.6524064171485.2941176471

    G2-U0.66844919791470.58823529411604.27807486631737.96791443851871.65775401072005.34759358292139.03743315512272.72727272732406.41711229952540.10695187172673.79679144381336.89839572192406.41711229952540.10695187171804.81283422461871.65775401071938.50267379682005.34759358292072.1925133692139.03743315512205.88235294122272.72727272732339.57219251342406.41711229952473.26203208562426.4705882353

    G2-L0.53475935831176.47058823531283.4224598931390.37433155081497.32620320861604.27807486631711.22994652411818.18181818181925.13368983962032.08556149732139.03743315511069.51871657751925.13368983962032.08556149731443.85026737971497.32620320861550.80213903741604.27807486631657.75401069521711.22994652411764.70588235291818.18181818181871.65775401071925.13368983961978.60962566841941.1764705882

    DG2294.1176470588320.8556149733347.5935828877374.3315508021401.0695187166427.807486631454.5454545455481.2834224599508.0213903743534.7593582888267.3796791444481.2834224599508.0213903743360.9625668449374.3315508021387.7005347594401.0695187166414.4385026738427.807486631441.1764705882454.5454545455467.9144385027481.2834224599494.6524064171485.2941176471

    *GAP*294.1176470588320.8556149733347.5935828877374.3315508021401.0695187166427.807486631454.5454545455481.2834224599508.0213903743534.7593582888267.3796791444481.2834224599508.0213903743360.9625668449374.3315508021387.7005347594401.0695187166414.4385026738427.807486631441.1764705882454.5454545455467.9144385027481.2834224599494.6524064171485.2941176471

    G3-U0.4010695187882.3529411765962.56684491981042.78074866311122.99465240641203.20855614971283.4224598931363.63636363641443.85026737971524.0641711231604.2780748663802.13903743321443.85026737971524.0641711231082.88770053481122.99465240641163.10160427811203.20855614971243.31550802141283.4224598931323.52941176471363.63636363641403.7433155081443.85026737971483.95721925131455.8823529412

    G3-L0.2673796791588.2352941176641.7112299465695.1871657754748.6631016043802.1390374332855.614973262909.0909090909962.56684491981016.04278074871069.5187165775534.7593582888962.56684491981016.0427807487721.9251336898748.6631016043775.4010695187802.1390374332828.8770053476855.614973262882.3529411765909.0909090909935.8288770053962.5668449198989.3048128342970.5882352941

    DG3294.1176470588320.8556149733347.5935828877374.3315508021401.0695187166427.807486631454.5454545455481.2834224599508.0213903743534.7593582888267.3796791444481.2834224599508.0213903743360.9625668449374.3315508021387.7005347594401.0695187166414.4385026738427.807486631441.1764705882454.5454545455467.9144385027481.2834224599494.6524064171485.2941176471

    *GAP*588.2352941176641.7112299465695.1871657754748.6631016043802.1390374332855.614973262909.0909090909962.56684491981016.04278074871069.5187165775534.7593582888962.56684491981016.0427807487721.9251336898748.6631016043775.4010695187802.1390374332828.8770053476855.614973262882.3529411765909.0909090909935.8288770053962.5668449198989.3048128342970.5882352941

    2650354.305

    2700360.99

    2750367.675

    2800374.36

    2850381.045

    2900387.73

    2950394.415

    3000401.1

    3050407.785

    3100414.47

    3150421.155

    3200427.84

    3250434.525

    3300441.21

    3350447.895

    3400454.58

    3450461.265

    3500467.95

    3550474.635

    3600481.32

    3650488.005

    3700494.69

    3750501.375

    3800508.06

    3850514.745

    3900521.43

    3950528.115

    4000534.8

    4050541.485

    4100548.17

    4150554.855

    4200561.54

    4250568.225

    4300574.91

    4350581.595

    4400588.28

    4450594.965

    4500601.65

    4550608.335

    4600615.02

    4650621.705

    4700628.39

    4750635.075

    4800641.76

    4850648.445

    4900655.13

    4950661.815

    5000668.5

    Sheet1

    Sheet2

    Gain

    Fe-55 primary charge

    Ar/CO2212e-

    CF4109e-

    3/30/06PA test input cap1.00E-12Farad

    Vindelta VpedpeakFWHMpulser amp [V]pulser ch.calib. [e-/ch.]Gain% ResNotes

    3750501.37509513720.665277827.32447817846.83E+0439.1167192429Using Ortec PA (test input cap. Unknown 1 or 10pF ??)

    4/5/06

    HBD Full Scale prototype

    Gas: CF4

    Flow thru det. = 2 slpm (overnight)

    Flow thru analyzers: 600 sccm

    [H2O] =13.7ppm

    [O2] =16.2ppm

    Pin =755.5Torr

    Pout =752.6Torr

    Temp =21.5deg C

    peak-peak noise =

    4.0mV p-p Electronic Noise

    ADC charge axis calibration (@ specific spec amp gain) --> pedestal extrapolation

    trial 350 ohm on scope (split into Canberra input)1Mohm on Scope (Split into Canberra Input)

    Vin = 2660V --> NO GEM pulses, Corona @ ~3600VVin = 2660V --> NO GEM pulsestrial 2

    ADC Ch.pulser amp. [V] 1Mohm on scope# injected e-'sADC Ch.pulser amp. [V] 1 mohm on scope# injected e-'sRatio: 1Mohm/50ohmVin = 2660V, No coronatrial 1

    2380.0915.69E+054240.0915.69E+051.781512605ADC Ch.pulser amp. [mV]ADC Ch.pulser amp. [mV]

    2070.08755.47E+052612.86019.2

    1700.0784.88E+0514817.615524

    1270.0674.19E+052770.0674.19E+052.181102362231924.225529.6

    710.0543.38E+0545329.440337.4

    350.0452.81E+051320.0452.81E+053.771428571455633.554445.4

    70.03852.41E+0567838.468552.8

    80543.2

    94048.6

    127961.6

    152171.5

    GainPad: LUCKY # 13185084.5

    199189.5

    Constant Circuit Gain (spec amp gain is constant for all measurements)PA test input cap1.00E-12Farad

    50 ohm on scope (split into canberra) --> FIX CALIBRATION BY CONSTANT FACTOR

    Vindelta VpedpeakFWHM highFWHMpulser amp [V]pulser ch.calib. [e-/ch.]Gain% ResSpectra FilenameNotes

    ~1:00am3600481.32-15790131821469.43.33E+0353.036437247Gain_CF4_3600Using IO1195 PA

    3650488.005-1571942531181469.44.73E+0333.6182336182Gain_CF4_3650

    3700494.69-1573454281661469.46.77E+0333.0677290837Gain_CF4_3700Corona ON @ 3700V, initally no Corona @ 3700V

    3750501.375-1575446632381469.49.45E+0333.9514978602Gain_CF4_3750Corona Disappeared @ 3750V, then reappeared

    3800508.06-1578069653181469.41.30E+0433.0218068536Gain_CF4_3800Corona is back

    3850514.745-157118614044361470.41.81E+0432.4646314222Gain_CF4_3850Corona is ON

    3900521.43-157162718103661471.42.41E+0420.5156950673Gain_CF4_3900Corona is ON

    3950528.115-157193520472241471.42.82E+0410.707456979Gain_CF4_3950Corona is ON

    3970530.789-1571990?1471.42.90E+04

    3980532.126-1572015?1471.42.93E+04

    3990533.463-1572050?1471.42.98E+04

    4000534.8-1572048?1471.42.98E+04

    4050541.485-15723001471.43.32E+04

    1 Mohm on scope (split into canberra) --> FIX CALIBRATION BY CONSTANT FACTOR

    3700494.69-157.64407495176984.675.10E+0331.170303202

    3750501.375-157.64658808300984.677.37E+0336.7809327645

    ~2:00am3800508.06-157.649801160360984.671.03E+0431.644456946

    3850514.745-157.6415381770464984.671.53E+0427.3642990257

    3900521.43-157.6420231908230984.671.97E+0410.5473622423

    3900521.43-157.641884984.671.84E+040

    3940526.778-157.642032984.671.98E+040

    3900521.43-157.641760984.671.73E+04

    2:30am3950528.115-157.641988984.671.94E+04

    2:44am3950528.1151864984.671.68E+04

    time elapsed between red and blue ~ 1hr

    time elapsed between three blue @ 521V ~ 20min.

    2:48am3700211

    2:51am3800579

    GEM HV OFF

    1Mohm on Scope (Split into Canberra Input)

    Round 2Vin = 2660V --> NO GEM pulses

    GEM ON1/2 hr after HV OFFADC Ch.pulser amp. [V] 1 Mohm on scope# injected e-'s

    4200.0915.69E+05

    3290.07554.72E+05

    2380.0623.88E+05

    1300.04452.78E+05

    510.03151.97E+05

    GainPad: LUCKY # 13

    Constant Circuit Gain (spec amp gain is constant for all measurements)PA test input cap1.00E-12Farad

    1 Mohm on scope (split into canberra) --> FIX CALIBRATION BY CONSTANT FACTOR

    4:00amVindelta VpedpeakFWHM highFWHMpulser amp [V]pulser ch.calib. [e-/ch.]Gain% ResSpectra FilenameNotes

    3600481.32-146.76gain decreased--> out of range (same circuit voltage)

    3700494.69-146.762757601000.41.59E+0334.5303867403Gain2_CF4_3700Using IO1195 PA

    3750501.375-146.7692131781000.42.19E+0332.6687887418Gain2_CF4_3750No Corona

    3800508.06-146.761792311041000.42.99E+0331.9253438114Gain2_CF4_3800No Corona

    3850514.745-146.762853531361000.43.96E+0331.4989809153Gain2_CF4_3850No Corona

    3900521.43-146.764325241841000.45.31E+0331.7921072638Gain2_CF4_3900No Corona

    3950528.115-146.766417642461000.47.23E+0331.2277851122Gain2_CF4_3950No Corona

    4000534.8-146.7695211403761000.41.01E+0434.2203938986Gain2_CF4_4000No Corona

    4050541.485-146.76132515464421000.41.35E+0430.0320704463Gain2_CF4_4050No Corona

    4100548.17-146.76167518673841001.41.67E+0421.0785174776Gain2_CF4_4100No Corona

    481.323329.7412844037481.32

    494.691594.76609174314731.7376146789488.005

    501.3752191.33489908266767.328440367494.694.2434614552

    508.062989.81930275239449.9944954128501.3754.3124373638

    514.7453962.685357798212981.9467889908508.064.3420506306

    521.435311.848660550518116.9467889908514.7454.5718862724

    528.1157230.046825688124082.3633027523521.434.5337065948

    534.810084.399119266128240.080733945528.1153.9059333106

    541.48513507.786275229428982.5302752294530.7892.8739967481

    548.1716736.793247706429320.0073394495532.1262.1706004775

    29792.4752293578533.463

    29765.4770642202534.8

    33167.2458715596541.485

    Sheet2

    26

    148

    319

    453

    556

    678

    805

    940

    1279

    1521

    1850

    1991

    Pulser Amp [mV]

    ADC Ch.

    ADC Ch. Vs Pulser Amp

    Sheet3

    238

    207

    170

    127

    71

    35

    7

    Pedestal

    Pulser Amp [V]

    ADC Ch.

    ADC Ch. Vs Pulser Amp

    568750

    546875

    487500

    418750

    337500

    281250

    240625

    Calibration

    ADC Ch

    # inj e-'s.

    ADC Ch. Vs Pulser Amp

    3329.741284403728240.0807339455100.77127339451594.7660917431

    4731.737614678928982.53027522947368.22237431192191.3348990826

    6767.32844036729320.007339449510277.06402568812989.8193027523

    9449.994495412829792.475229357815317.85173211013962.6853577982

    12981.946788990829765.477064220219699.18154862395311.8486605505

    18116.946788990833167.245871559618443.50145688077230.0468256881

    24082.363302752319780.484576146810084.3991192661

    17323.326411009213507.7862752294

    19383.0031082569

    16838.7603669725

    50ohm

    50 ohm chrge sat

    1Mohm

    1Mohm_trial 2

    DeltaV(Foil) [V]

    Absolute Gain

    HBD Prototype GEM Gain

    424

    277

    132

    Pedestal

    Pulser Amp [V]

    ADC Ch.

    ADC Ch. Vs Pulser Amp

    568750

    418750

    281250

    Calibration

    Injected # of e-'s [#]

    ADC Ch.

    ADC Ch. Vs Pulser Amp

    420

    329

    238

    130

    51

    Pedestal

    Pulser Amp [V]

    ADC Ch.

    ADC Ch. Vs Pulser Amp

    Calibration

    ADC Ch

    # inj e-'s.

    ADC Ch. Vs Pulser Amp

    4/6/06

    HBD Full Scale prototype

    Gas: CF4

    Flow thru det. = 2 slpm (overnight)

    Flow thru analyzers: 600 sccm

    [H2O] =13.7ppm

    [O2] =17.3ppm

    Pin =757.8Torr

    Pout =754.8Torr

    Temp =21.6deg C

    250mV. Lower rate Corona

    peak-peak noise =

    3.0mV p-p Electronic Noise

    ADC charge axis calibration (@ specific spec amp gain) --> pedestal extrapolation

    1Mohm on Scope (Split into Canberra Input)--included factor of 10 for 1/10 volt div on PA PCB

    Vin = 2660V --> NO GEM pulses

    ADC Ch.pulser amp. [V] 1 Mohm on scope# injected e-'s

    4330.08955.59E+05

    3190.07654.78E+05

    2420.0674.19E+05

    1520.0563.50E+05

    430.0432.69E+05

    CF4 primary charge

    GainPad: LUCKY # 13109

    PA = IO1195

    HV ON for ~3hrs, then OFF at ~4:20, then ON again at ~4:30Constant Circuit Gain (spec amp gain is constant for all measurements)PA test input cap1.00E-12Farad

    1 Mohm on scope (split into canberra) --> FIX CALIBRATION BY CONSTANT FACTORUsing IO1195 PA

    TimePA pulse amp [mV]Vmesh [V]Imesh [uA]Ivd [uA]Vin (Vvd) [V]delta V [V]ped [ch.]peak [ch.]FWHM high [ch.]FWHM [ch.]pulser amp [V]pulser ch.calib. [e-/ch.]Gain% ResSpectra FilenameNotes

    4:55pm19436002.32873600481.32-318.45108222228N/AN/A748.592.93E+0353.4646500176Gain3_CF4_3600No visible Corona, but can see it on scope

    5:03pm25636502.54291.73650488.005-318.45300462324N/AN/A748.594.25E+0352.3890371089Gain3_CF4_3700No visible Corona, but can see it on scope

    5:08pm39837002.68295.73700494.69-318.45578763370N/AN/A748.596.16E+0341.273913771Gain3_CF4_3800No visible Corona, but can see it on scope

    5:11pm60037502.56299.73750501.375-318.459361176480N/AN/A748.598.62E+0338.2637809399Gain3_CF4_3900No visible Corona, but can see it on scope

    5:14pm78538003.28303.73800508.06-318.4514691796654N/AN/A748.591.23E+0436.5884360402Gain3_CF4_4000Visible Corona, but can see it on scope, and HV current meter

    5:19pm95038253.31305.83825511.4025-318.4517861390792N/AN/A748.591.45E+0437.6345363397Gain3_CF4_4100Visible Corona, but can see it on scope, and HV current meter

    60

    38.8888888889

    0.0000133333133.3333333333

    1.88E-052.50E-061.63E-05

    1.54E+06

    0

    2

    0.0000024545

    Pedestal

    Pulser Amp [V]

    ADC Ch.

    ADC Ch. Vs Pulser Amp

    Calibration

    ADC Ch

    # inj e-'s.

    ADC Ch. Vs Pulser Amp

    3329.741284403728240.0807339455100.77127339451594.7660917431

    4731.737614678928982.53027522947368.22237431192191.3348990826

    6767.32844036729320.007339449510277.06402568812989.8193027523

    9449.994495412829792.475229357815317.85173211013962.6853577982

    12981.946788990829765.477064220219699.18154862395311.8486605505

    18116.946788990833167.245871559618443.50145688077230.0468256881

    24082.363302752319780.484576146810084.3991192661

    17323.326411009213507.7862752294

    19383.0031082569

    16838.7603669725

    50ohm Trial 1

    50 ohm chrge sat

    1Mohm Trial 2 (1Hr later)

    1Mohm_trial 3 (HV OFF, 3 hrs later)

    Trial 4: 4/6/2006

    DeltaV(Foil) [V]

    Absolute Gain

    HBD Prototype GEM Gain

  • Summary in Brief: Transparency.Levels presently in HBD prototype:14 ppm water.22 ppm oxygen.Presently low flow to conserve CF4Easy to achieve < 10 ppm eachWater cost in photo-electrons: ~1 p.e./ 10ppm of water

  • Collage of Process.Status:Grid Corona repair success.4 bad strips on top GEM Live with it.55Fe

  • Prototype Summary:HBD ready for installation.Few Troubles Encountered:Corona point on gridfound and fixed.2 Shorted Stripscompensated via divider chain.Shorted strips only 4% of GEM area.We will monitor QE and Gain daily:Use existing as long as it continues to work.Backup photo-cathode ready (if needed).Chi sees running compressor FPGA code.Expects to be ready by install date (April 19)Shotgun Wedding of detector to electronics.

  • Preliminary Run PlanShip Monday April 17.In assembly hall by Tuesday afternoon.Install during Wednesday April 19 access.Initial install below beam pipe (turtle mode)Option 1Option 2

  • Turtle Position TestsCUDDY HUTCH TESTS: Oscilloscope (Signals are coming from HBD...) Look for 55Fe signals on scope. Look for MIPs on scope + digitize. FULL CHAIN TESTS-1: STANDALONE DAQ (Signals are getting through DAQ...) Establish throughput of data in separate granule. Use MIPs to perform "gate timing". Use laser trigger to flash our lamp as well(??) Move detector to operating position after MIPs are seen though full chainNOTE: Detector can switch from hadron-sensitive to hadron-blind by changing grid bias.

  • Operating Position TestsFULL CHAIN TESTS-2: STANDALONE DAQ (First observation of Cerenkov Blobs...) Double check timing of signals with grid in "MIP mode". ZERO the magnetic field.Put detector in Blind-Mode and take ERT triggers:

    FULL CHAIN TESTS-3: BIG PARTITION (Blobs from identified electrons; N-zero) ZERO the magnetic field. Set detector to Blind-Mode and take ERT triggersUse DCH/RICH/EMC to select events with an electron in the HBD active area.

    FULL CHAIN TESTS-4: PLUS/MINUS FIELD. (Matching/veto power in field on mode...)Swap the leads on the magnet for +/-.Take another zero-field reference run. Take 1/4, 1/2, 3/4, and full field runs. Scan the middle coil above and below the "cancel point.

  • General Questions/IssuesCan we get an ERT trigger that shadows the HBD active area?Should be possible by masking off channels that do not shadow HBD active area.Can we get a LVL-2 trigger to run that selects electrons in the HBD active area?Not needed if masking ERT channels.Desirable if ERT is unchanged during our runs.Is our present offline software optimized for debugging the detector?Tracks do project into HBD, clusters are formed.Initial calibration is issue (MIPs??)Do we want to use the flash lamp in a manner like the EMC laser trigger? Possible in principle if we get trigger to lamp.Value is debatable during Run6 (better in Run7)

  • Main HBD: HV panels and side coversGas in/out portsUV window portsBrackets insertsVoltage dividersOuter (copper) sideInner sideTopBottom

  • Jig #1 for the PCB and active panels

  • Jig #2 for the entire vesselMain HBD is ready with only the exception of the Kapton PCB that carries the pads.

  • Update on the PCB production There were problems at each of the three production steps (drilling, plating, etching) and three production cycles were needed before one full cycle could be completed. This happened on March 30.Ilia traveled to Geneva and brought the PCB to WI on March 31.A thorough check of the PCB revealed two problems:172 holes (app. 15%) were not plated-through app. 50% of the holes for the pins to support the GEMs were not at the correct place. We could mount the pins of three panels only, the rest was increasingly off (maximum deviation is of the order of 1 mm) A thorough comparison with the PCBs that failed in the previous cycles revealed that the material suffers some contraction mainly during the plating process but also during etching. CERN is producing a new PCB introducing a scaling factor in the drilling that will hopefully compensate for the contraction. In the meantime we have developed the tools and means to repair the existing PCB, in case that this new cycle would turn out to fail again.

  • Hole mismatchBottom middle Bottom Right

  • Glove BoxDELAY!!!Installation of Glove Box on May 30/31.Difficult to imagine using it for a beam test using partially instrumented final HBD.CAN use Italian box (we just did this)No presently known advantage of final HBD over present state of prototype.No desire to compromise final detector to rush pieces into beam.