Workshop on CMS Beam Conditions, Radiation Monitoring and Luminosity Systems
S1
DESY, Zeuthen
Vidyo details are available at https://indico.cern.ch/collaborationDisplay.py?confId=248067
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Registration 1h 30m S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany -
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Introduction S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany- 10:30
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12:30
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Lunch 1h DESY Cafeteria
DESY Cafeteria
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13:30
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16:05
BCMs (Protection & Beam Background Monitoring) S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany- 13:30
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15:55
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Coffee Break 30m S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany - 16:25 → 16:50
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18:15
Diamond Preparation & Characterization (BCML,BCMF, PLT, LHC Experience) S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany- 16:50
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BPTX S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyTiming, Fill Pattern and Bunch Currents
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20:00
Small Dinner at DESY Cantine 55m S1
S1
DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany
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09:00
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10:30
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08:30
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10:40
BCM1F Luminosity and Backend Electronics S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyFrontend Performance, RHU, Electronics for calibration & efficiency studies
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10:05
Agilent ADC: Hardware Introduction and Performance 30mSpeaker: Sylvain Bruderer
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10:40
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Coffee Break 25m S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany -
11:05
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12:00
BCM1F Luminosity and Backend Electronics S1
S1
DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyFrontend Performance, RHU, Electronics for calibration & efficiency studies
- 11:05
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- 12:00 → 12:30
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12:30
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13:30
Lunch 1h DESY Cafeteria
DESY Cafeteria
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13:30
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15:50
Luminosity S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyHF, Pixel, Calibration, Corrections, Systematics, pre and post LS1
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Coffee Break 30m S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany -
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18:30
LUMI DAQ and Data Logging S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyFor all BRM/Lumi systems
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19:00
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21:00
Workshop Dinner 2h S1
S1
DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyItalian Restaurant
Il Gattopardo, Trattoria Wildau
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08:30
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10:40
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BHM - Directional Quartz Detector (Backgrounds at Large Radius) S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany- 08:30
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10:00
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10:30
Coffee 30m S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany -
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12:20
Radiation Simulation and "Calibration" S1
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DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanySimulation, Medipix, Passives,...
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Lunch 50m DESY Cafeteria
DESY Cafeteria
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14:55
Closeout and Planning S1
S1
DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany-
13:10
Scientific Secretary Reports (Max. 2 Slides Each) 5mThe slides should be on behalf of the scientific secretary and session chairman and should summarize: -- the main highlights presented -- any issues raised in the session And list open questions to follow up in the future.
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Diamond Preparation (BCML, BCMF, LHC Experience) 5mSpeaker: Moritz GuthoffMinutes for Session: Diamond Preparation & Characterization
R.Stone, B. Harrop: RIE diamond processing and results
Q (Lohmann): RIE expensive. For more then few um, first mechanical polish. Since already polished, where is the ffect?
A: Low tech, cheap process. Need remove material since surface is bad
Q (Lange): Picture with step. Where do little dots come from?
A: Minor defects. Always present.
Q (Lange): Are they in the bulk? Or do they show up when RIE?
A: Are there before RIE and aft
Q (Dabrowski): Slide 12. Top right plot. Spike when changing HV. Polarization?
A: Yes.
Q: Stabilizes at 1200V why no spikes?
A: Already at full CCD, spike cant go higher.
Q: What when off and on when already at full ccd
A: No overshoot.
Q: Rate of source used for CCD.
A: ~ 10Hz PMT triggers with ~ 1mm collimator opening.
Q (Guthoff): Maybe micro cracks from mechanical polishing the problem. Polish + RIE would not be beneficial then.
A: Studies for needed amount of RIE ongoing. Influence of mechanical polish not yet known.
Comment (Schnetzer): Option to remove more material: Process more diamond at once to be more cost efficient when more RIE is needed.
Q(Afanaciev): What metallization is used?
A: Sputtered Ti/W alloy, one layer only
Q(Afanaciev): Why not Ti Pt Au?
A: For pixel W is better!
M.Hempel: Diamond measurements in Zeuthen
Slide 11:
Q: What dose to diamond?
A: A few Gy. Relatively low dose.
Looks strange, difficult to reproduce.
MIP pulse is not smaller after this dose, but broader. Maybe high current.
Q:X-axis, counts is how much charge?
A: Unknown
Comment: Signal size is reasonable.
Small number of poly diamonds. Atlas buys whole wafers, put metal dots all over wafer and measure each dot. Huge variation of performance of material. When order small numbers maybe one buys diamonds rejected by Atlas.
E. Griesmayer: Diamond Preparation for LHC
Diamonds for Atlas and LHC.
Characterize diamonds:
Optical: Often seen: black inclusion. Several 100 um. Problem for single particle measurement. Diamonds are returned.
Electronic: IV. Years ago often nice curve.
It curve: charge up of the diamond. ~ 5 seconds time constant
Often seen huge distortion: nA currents. In It curve offset that does not disappear. Three time constants
Electronics:
3 amps: 1 fast, 1 precise (spectroscopic) and intermediate (broadband, 2Ghz)
Suggestion to use TCT measurement to obtain doping level in diamond.
K. Afanaciev: Investigation of Detector Properties of Diamond-on-Iridium Sensors
No questions
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13:45
BPTX 5mSpeaker: Brian Pollack
BPTX minutes:
Andrey: Scope Based Algorithms
Talk will be mostly algo sw
BPTX, 175m from IP, connected to scopes, goes to DAQ computer, python scripts, publish to DIP/HTML/ASCII
Two identical scopes, Timing and Bunches, (different orbit sources), SW runs and measures: ΔT, phases, bunch pattern, wrongBucketFlag, pulse integrals, pulse length
DIP goes global and local, ASCII local, HTML access from .cms network
Who uses info? Timing: LHC (cogging), L1 Trigger (bunch pattern, cogging), TTC (phases) Bunching: Nobody cares
Cogging: time difference between B1 and B2, done per BX, σ~10ps, 0.1ns ~ 1.5cm in z
p-Pb cogging: beams are not locked, cogging cannot be calculated with Timing, but can be with Bunches (now someone cares about it?)
Bunch Pattern: abandon BPTX gating signals at L1 and use LHC bunch config instead. BPTX will be relegated to cross-checker, a sad fate indeed.
Monitoring: Tell Trigger Shifter about the html page, it’s nice, maybe make a simplified ‘Shifter Version’ because shifters are simple
Time performance: Timing takes 14 seconds, Bunches takes 35, (atlas takes 3 seconds....). Andrey thinks python is too slow, switch to C/C++ (will take more work)? But who even cares? This isn’t a race! (update: it is almost always a race)
Instabilities: scopes crash, update firmware, jiggle the cable, turn it on and off? Make the code better? cron-job to restart crappy code
What should we do differently? Use Bunches as main scope. Remove fluff/cruft from analysis code, publish minimum info to DIP. Change code language?
Questions: Arkady: firmware? fans busted, overheating? new scope has best firmware!
Andrezj: possible to calculate bunch intensities? yes within 5%, but needs more studies to do better.
Someone: Why did you screw up the code in the first place? Old C++ code was 12 lines and did not respond well to changing starting parameters. Python prevented crawling around on the ground to tweak parameters. But maybe Andrey needs to crawl more?
Anne: Ever use external trigger? yes. Can you make an orbit the external trigger? Can we get around and just use one scope? yes, if you believe phase does not change. but that’s a lot of faith
Vlad: Atlas is not gunna update their BTPX
Me: why dont we just get a better scope with more inputs? it’s super expensive (100k+)
Anne: BPTX Hardware
Hardware has been stable. Scope+software not so much. Caused horrible strife among shifters.
Timing: Keep HW same. Update scope firmware/fans. Move cogging to Bunches. Write down priorities. Include bptx in DQM. We need to debug the code, obviously.
BPTX going forward: PCIe-2ch Acqui card, lots of stats
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14:05
Pixel Luminosity Telescope 5mSee previous contribution for slidesSpeaker: Ms Jessica Lynn Leonard (DESY)
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Coffee Break and Break for AMS Seminar 1h 5m S1
S1
DESY, Zeuthen
Platanenallee 6 15738 Zeuthen Germany -
16:00
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16:50
Closeout and Planning S1
S1
DESY, Zeuthen
Platanenallee 6 15738 Zeuthen GermanyConveners: Philip Hebda (Scientific Secretary), Wolfgang Lohmann (Chairperson)- 16:00
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16:25
Overview, Summary and Next Steps 20mSpeakers: Dr Anne Dabrowski (CERN), David Stickland
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