Workshop on CMS Beam Conditions, Radiation Monitoring and Luminosity Systems

22 Apr 2013, 09:00 → 24 Apr 2013, 17:00 Europe/Berlin

S1 (DESY, Zeuthen)

Vidyo details are available at https://indico.cern.ch/collaborationDisplay.py?confId=248067

Monday 22 April

09:00 → 10:30 Registration

10:30 → 12:30 Introduction

10:30 Welcome to DESY Zeuthen

Speakers: Prof. Wolfgang Lohmann (DESY), Wolfram Zeuner

Slides welcome_WLO_v1.pptx

10:45 BRM&Lumi Collaboration

Speaker: Dr David Stickland (Princeton University)

Slides BRIL4Workshop.pptx

11:15 Run 2 Scenarios Relevant for Luminosity and Beam Background Monitoring

Speaker: Dr Anne Dabrowski (CERN)

Slides LHC_Running_Expectations_after_LS1.ppt

11:40 BRM Highlights, Issues, Reflection on 2012/2013 and Goals for LS1

Speaker: Anne Dabrowski

Slides BRM_Highlights_2012_Goals_LS1_short.pptx

12:05 Reflections on Luminosity Measurement: Requirements and Strategy

Speaker: Prof. Dan Marlow (Princeton University)

Slides Marlow_BRM_WS.pdf

12:30 → 13:30 Lunch

13:30 → 16:05 BCMs (Protection & Beam Background Monitoring)

13:30 BCML Hardware Stability in 2012 and Required Maintainance during LS1

Speaker: Moritz Guthoff

Slides Guthoff_BCMLhardwareAndMaintainance.pptx

13:50 BCML Sensor Efficiency and Consequence on Abort Threshold

Speaker: Moritz Guthoff

Slides Guthoff_SensorEfficiencyAndAbortThresholds.pptx

14:15 BCM1F Polarization Studies, Consequence on Efficiency and Plans for Operation in LS1

Speaker: Ms Jessica Lynn Leonard (DESY)

Slides Leonard-Polarization-workshop-21Apr13.pdf

14:35 BCM1F Frontend Upgrade: Status and Planning LS1

Speaker: Alan Bell

Slides DESY_Workshop.pdf

15:05 Characterisation of BCM1F lasers

Speaker: Brian Pollack

Slides ZeuthenConference.pdf

15:20 BCM1F - Strategy for Beam Background Monitoring with and without Non-colliding Bunches after LS1

Necessary for automatic tracker HV switch on

Speaker: Ms Jessica Lynn Leonard (DESY)

Slides Leonard-BeamBackground-workshop-21Apr13.pdf

15:40 BCM1F - Multimple Gate and Delay Unit (MGD) - Plan for Hardware & Logic Modifications during LS1

Speaker: Hans Henschel

Slides Henschel_-_MGD_LS1_Upgrade_22apr13.ppt.pdf

15:55 → 16:25 Coffee Break

16:25 → 16:50 BCMs (Protection & Beam Background Monitoring)

Conveners: Alan Bell (Scientific Secretary), Wolfgang Lohmann (Chairperson)

16:25 BCM1F4LHC - Beam Background Measurements and Plans for the LHC

Speaker: Maria Hempel

Slides BCM1F4LHC_Presentation.pptx

16:50 → 18:15 Diamond Preparation & Characterization (BCML,BCMF, PLT, LHC Experience)

16:50 Diamond Preparation Procedure and Experience at Prism

Speakers: Bert Harrop, Bob Stone

Slides RIE_process-and-results.pdf

17:15 Diamond Measurements from Zeuthen

Speaker: Maria Hempel

Slides Diamond_Measurements.pdf

17:35 Diamond Preparation for LHC

Speaker: Erich Griesmayer

Slides Griesmayer.pptx

17:55 Investigation of Detector Properties of Diamond-on-Iridium Sensors

Speaker: Konstantin Afanaciev

Slides bcm_irridium_diam_akg.pdf

18:15 → 19:05 BPTX

Timing, Fill Pattern and Bunch Currents

18:15 BPTX 2012/2013 Scope-Based Algorithms and Running Stability

Talk focused only on the scope based BPTX measurements, code, algorithms, stability, publishing and data logging

Speaker: Andrey Posdnyakov

Slides 2013_04_22_BPTX_software.pdf

18:40 BPTX Hardware Upgrade Options for LS1 and Discussion on Strategy

Postpone this talk to after the talk of Sylvain Brudere who will give an introduction of Agilent cards

Speaker: Anne Dabrowski

Slides BPTX_Thoughts.ppt

19:05 → 20:00 Small Dinner at DESY Cantine

Tuesday 23 April

08:30 → 10:40 BCM1F Luminosity and Backend Electronics

Frontend Performance, RHU, Electronics for calibration & efficiency studies

08:30 BCM1F Backend Requirements Overview

Speaker: David Stickland

Slides BackendRequirements.pptx

08:55 Review of VME Discriminators for BCM1F

Speaker: Ms Jessica Lynn Leonard (DESY)

Slides Leonard-Discriminators-workshop-22Apr13.pdf

09:15 Recording Histogramming Unit (RHU) Hardware and Commissioning Results

Deadtime free histogramming at 160 MHz (x4 external bunch clock) for luminosity and beam background measurements

Speaker: Marek Penno

Poster LumiNibble-Control-Poster.pdf

Slides Marek-Penno-RHU-BCM1F-Workshop-2013-04.pdf Marek-Penno-RHU-BCM1F-Workshop-2013-04.pptx

09:40 Luminosity Algorithms, Calibration System and Plans for Systematic Corrections

Speaker: Roberval Walsh

Slides 20130423_BCM1FWorkshopZeuthen_RWalsh_v1.pdf

10:05 Agilent ADC: Hardware Introduction and Performance

Speaker: Sylvain Bruderer

10:40 → 11:05 Coffee Break

11:05 → 12:00 BCM1F Luminosity and Backend Electronics

Frontend Performance, RHU, Electronics for calibration & efficiency studies

11:05 ADC & Signal Processing Systems from CERN/CMS: Introduction, Options, Performance

General overview of hardware trends in high energy physics

Speaker: Vladimir Ryjov

Slides BCM1f_BackEnd_WorkShop_Zeuthen_April_2013.pdf

11:35 Deconvolution Algorithms: Simulation Results

Speaker: Piotr Burtowy

Slides Presentation_PB_longer_Piotr.pdf Presentation_PB_short_Piotr.pdf

12:00 → 12:30 Pixel Luminosity Telescope Detector Design and Commissioning

12:00 PLT Pilot Run, Bench Measurements, Future Tests, and Installation

Speaker: Dean Hidas

Slides 2013-04-23-BRMWorkshop.pdf

12:30 → 13:30 Lunch

13:30 → 15:50 Luminosity

HF, Pixel, Calibration, Corrections, Systematics, pre and post LS1

13:30 Luminosity Prescision Required from Physics: Absolute and Relative Bunch-by-Bunch

Speakers: Marco Zanetti, Stoyan Stoynev

Slides LumiPOG.ppt

14:00 Luminosity Measurements using HF

Introduction, Measured Performance, Pileup correction and Expectations for beyond LS1

Speaker: Andrzej Zuranski

Slides HFLumi_Berlin.pdf

14:30 HF Luminosity Corrections

Speaker: Philip Hebda

Slides HFCorrections.pdf

14:55 Luminosity Measurements using the Pixels

Speaker: Marco Zanetti

Slides PixelLumi_DESY.ppt

15:20 Van der Meer Scan Issues

Speaker: Monika Grothe

Slides BRMworkshop_Zeuthen_April2013.pptx

15:50 → 16:20 LUMI DAQ and Data Logging

For all BRM/Lumi systems

Conveners: Marina Giunta (CERN), Phil Hebda (Scientific Secretary)

15:50 Lumi Calc: Present Functionality and Requests for LS1 and Beyond

Speaker: Zhen Xie

Slides ZhenZeuthen.pdf

16:20 → 16:50 Coffee Break

16:50 → 18:30 LUMI DAQ and Data Logging

For all BRM/Lumi systems

16:50 TTC Upgrade: Introduction, Signal Distribution and Decoding for Lumi DAQ

Speaker: Jeroen Hegeman

Slides 20130423_brm_and_lumi_workshop_zeuthen.pdf

17:15 Lumi DAQ: Motivation and Proposed Architecture

Speaker: Olga Driga

Slides DrigaOlga_Lumi_DAQ_23.04.2013.pdf

17:45 BRM: Synchronising the RHU to Lumi DAQ

Speaker: Ms Jessica Lynn Leonard (DESY)

Slides Leonard-RHU-LumiDAQ-workshop-23Apr13.pdf

18:10 904 Setup for DAQ Hardware Testing

Speaker: Arkady Lokhovitskiy

Slides WorkshopZeuthen2013-904Setup.pptx

18:30 → 18:55 Detector R&D

Conveners: Andrzej Zuranski (Scientific Scretery), David Stickland (Chairperson)

18:30 Sapphire Detectors for Beam Monitoring

Speaker: Dr Sergej Schuwalow (DESY Zeuthen)

Slides Sapphire_Detectors_For_Beam_Monitoring.pdf

19:00 → 21:00 Workshop Dinner

Italian Restaurant
Il Gattopardo, Trattoria Wildau

Wednesday 24 April

08:30 → 10:00 BHM - Directional Quartz Detector (Backgrounds at Large Radius)

08:30 Detector Motivation: FLUKA Simulations, Frontend Design and Test Beam Results

Speaker: Stella Orfanelli

Slides StellaWorkshopV6.pptx

09:05 Proposal for Electronics and Services

Speaker: Marina Giunta

Slides BHM_DesyWorkshop.pptx

09:40 BRM Test Beam Needs for LS1

Speaker: Anne Dabrowski

Slides Test_Beams.ppt

10:00 → 10:30 Coffee

10:30 → 12:20 Radiation Simulation and "Calibration"

Simulation, Medipix, Passives,...

10:30 Fluka Simulation of CMS Cavern and Long Straight Section and Bench Marking against Measurements

Speaker: Moritz Guthoff

Slides BRMworkshop_FLUKA_benchmarking.pptx

11:05 FLUKA Plotting Tool for CMS User

Speaker: Slawomir Tadeja

Slides cms-fluxmap_DESY_24.04.2013.pdf

11:30 Radiation Simulation for Upgrade Scenarios (BRM and Sub-Detector Requests)

Speakers: Anne Dabrowski, Moritz Guthoff

Slides BRMworkshop_FLUKA_upgrades.pptx

11:55 Medipix Detector: Benefit to CMS and Plans for LS1

Speaker: Arkady Lokhovitskiy

Slides WorkshopZeuthen2013-Medipix.pptx

12:20 → 13:10 Lunch

13:10 → 14:55 Closeout and Planning

13:10 Scientific Secretary Reports (Max. 2 Slides Each)

The 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.

13:15 Introduction

Speaker: Maria Hempel

Slides Close_out___Introduction.pptx

13:25 BCM (Protection & Background Monitoring)

Speaker: Alan Bell

Slides Summary_23-4-PM.pdf

13:35 Diamond Preparation (BCML, BCMF, LHC Experience)

Speaker: Moritz Guthoff

Slides Closeout_DiamondPreparation.pptx

Minutes 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

13:45 BPTX

Speaker: Brian Pollack

Slides BPTX_Summary_Zeuthen.pdf

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

13:55 BCM1F Luminosity and Backend Electronics

Speaker: Ms Jessica Lynn Leonard (DESY)

Slides Leonard-SciSecSum-BackendPLT-workshop-24Apr13.pdf

14:05 Pixel Luminosity Telescope

See previous contribution for slides

Speaker: Ms Jessica Lynn Leonard (DESY)

14:15 Luminosity

Speaker: Andrzej Zuranski

Slides HF_summary.pdf

14:25 Lumi DAQ

Speaker: Philip Hebda

Minutes LumiDAQ.pdf

Slides LumiDAQSummary.pdf

14:35 BHM (Background at Large Radius)

Speaker: Maria Hempel

Slides Close_out___BHM.pptx

14:45 Radiation Simulation and Calibration

Speaker: Stella Orfanelli

Slides FLUKA&MEDIPIX.pptx

14:55 → 16:00 Coffee Break and Break for AMS Seminar

16:00 → 16:50 Closeout and Planning

Conveners: Philip Hebda (Scientific Secretary), Wolfgang Lohmann (Chairperson)

16:00 BRM Electronics: Steering the Correct Early Choices for LS1

Speakers: Magnus Hansen, Vladimir Ryjov, Dr Wolfgang Lange (DESY Zeuthen)

Slides BCM1F_front_end_planning_mod_20_04_2013_AD_frontend.pdf

16:25 Overview, Summary and Next Steps

Speakers: Dr Anne Dabrowski (CERN), David Stickland

Slides

• Summary.pptx
• white_board_close_out_1.JPG
• white_board_close_out_2.JPG

16:45 Closing Remarks

Speaker: Wolfgang Lohmann

Slides summary_WLO_v1.pptx