general tracker meeting 07/2002 frank hartmann 1 joint venture of cms and atlas single shot test...
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![Page 1: General Tracker Meeting 07/2002 Frank Hartmann 1 Joint venture of CMS and ATLAS Single shot test beam at PS! Simulation of a beam loss! Joint ad venture](https://reader035.vdocument.in/reader035/viewer/2022062714/56649d595503460f94a39326/html5/thumbnails/1.jpg)
General Tracker Meeting 07/2002Frank Hartmann
1
Joint venture of CMS and ATLAS
Single shot test beam at PS!Simulation of a beam loss!
Joint adventure of CMS and ATLAS
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General Tracker Meeting 07/2002Frank Hartmann
Can we imagine a dump failure?
Some LHC numbers• Proton energy 7 TeV• Particles per bunch 1011
• Number of bunches 2835• Stored beam energy 336 MJ• Beam current 0.5 A• Failure: magnet quench; power converter fail, etc.
dipole or quadrupol failure decaying B-field need to dump
• Revolution time: 90µs• Abort gap: 3,17µs• Kicker rise time: 3µs
Can we even imagine a beam „lost“ in IP1 or IP5?
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General Tracker Meeting 07/2002Frank Hartmann
!!DUMP near to IP5 (CMS)!!
Mika Huhtinen:• Single module prefire:very unlikely
Assumption only one of the 14 abort kicker fires 4*10^13 protons lost in IP 5
• Unsynchronized abort: very likelyAssumption one of the dump kickers does not hit the abort gab bunch swept out for ~3µs; some deviated bunches
continue in the machine1*10^12 protons lost in IP 5
MC: STRUCT;MARS;FLUKA
IP5
IP6
LHC layout and hint for beamloss reason
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General Tracker Meeting 07/2002Frank Hartmann
Improbable things are not impossible!
• Both prefire and unsynchronized accidents happend at the TEVATRON!
• BUT: Less critical at the TEVATRON!
• They are improbable at LHC!!??!!
!RA EPAC02
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General Tracker Meeting 07/2002Frank Hartmann
Beam conditions at the PS8cm
cut• Fast extraction => spill ~ 100 ns duration
• Up to 1011 protons per spill (109 to 1010/ cm²)
• 24 GeV protons
• Beam spot: Starting 2-3cm diameter beam spot, but we expect to be able to tweak the last
quadrapole to have cigar shaped beam spot.– We are currently investigating if a 10cm diameter spot possible?
• Dosimetry to be handled by T7 group (secondary emission counter, gold or nickel foils).
• beam available for 8 hour shift, installation 1.5 days
• beam conditions fixed: 26.7.02
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General Tracker Meeting 07/2002Frank Hartmann
T7 Area
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General Tracker Meeting 07/2002Frank Hartmann
THE WHY!?!
• No integral effect expected (worst case = 10 days)
• But large instantaneous ionization! 1011 MIPS
1. Will our modules survive a beamloss?– Is our design robust?– Simple YES/NO test!
2. What is the dynamic behaviour?– Possible failure analysis!
ALL PARAMETERS will be dynamically checked slow (10µs) and fast (50ns) (Scopes/FADCs)
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General Tracker Meeting 07/2002Frank Hartmann
Specific Questions
1. Will the hybrid survive?2. ..............sensor survive?3. ..........complete module survive?
Disentanglement of components!!
• How many beam losses are digestable?• Check for bias voltage dependencies?
• Which component of the components breaks, if any?
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General Tracker Meeting 07/2002Frank Hartmann
Setup
cooling box available (-10°C) (thanks to ATLAS)
2 devices per carrier devices premounted in
carrier incl. patch panel
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General Tracker Meeting 07/2002Frank Hartmann
Carrier
3 ready in KA
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General Tracker Meeting 07/2002Frank Hartmann
Scenario1. Place carrier (DUT) in cold box 2. Full characterization in situ 3. SINGLE 100ns beam spill4. Full characterization in situ5. 2.-4. with different conditions
6. Place new carrier (DUT) ...(3 boxes=times).....etc.
• Full characterization in home lab; hopefully NO failure analysis
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General Tracker Meeting 07/2002Frank Hartmann
3 carriers / tests
1st carrier: HPK-sensor + hybrid (flex) Vbias ramp : one shot per ramp point (0..100V in steps of 20V and 100..400V in 50V-steps)
2nd carrier: ST-sensor + good TEC module
3rd carrier: HPK-sensor + KA prototype TEC module(some pinholes, current..)
after ~30 consecutive beam dumps: detect if the module is still alive!
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General Tracker Meeting 07/2002Frank Hartmann
Parameters on sensors
Readoutstrips
1. Ionisation: completely destroy field configuration/depletion!2. Sensor is short circuited! worst case 400V on CC!!3. Furtunately the power supplies will not react on that time scale!4. Still: Dynamics are complicated and we will try to measure them!
HV: voltage¤t!
Voltage over CC: Pinholes?CCbreak>120V(also check for potential on APV)
Single strip current!(also check for Rpoly)
+400V
0V
HV: voltage¤t!Single strip current!(also check for Rpoly)Voltage over CC: Pinholes?CCbreak>120V(also check for potential on APV)
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General Tracker Meeting 07/2002Frank Hartmann
Sensor parameterHV: bias voltage Ileak: global leakage currentVAC_DC: Voltage between AC and DC-pads of several groups of strips. 2 or 3 groups are planned!
IDC_biasresistor: also done for 2 or 3 groups of strips Iguard: current possibly induced in the guard ring
= 9 parameters (3 groups) sensors on PCB (circuit discussed with RH)
parameters measured with scopes or FADCs
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General Tracker Meeting 07/2002Frank Hartmann
Strip parametersSingle strip current measurement
Voltage over SiO2 to estimate pinhole development
Scope (measure I)
Scope (measure V)
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General Tracker Meeting 07/2002Frank Hartmann
Test on hybrid (bare and on module)
Parameters:V250: 2.5V hybrid supply voltageI250
V125: 1.25 supply voltageI125
= 4 parameters (measured with scopes)(voltages refer to hybrid ground level)
Readout Standard: APV: Noise, ped, calib
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General Tracker Meeting 07/2002Frank Hartmann
Readout in situ (APV,module)
Use own Karlsruhe CMS-like readout system (good knowledge of the software)
1. Prequalification with normal procedures: pedestal, noise, common mode, calibration, LED,
laser?2. TRIGGER: increase of sensor leakage current
• send APV reset• when APV tickmarks are found:• send software triggers and search for header• monitor baseline behaviour if header is found• Laser response?• LED response
3. Later: full qualification (noise,ped,calib,LED)!
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General Tracker Meeting 07/2002Frank Hartmann
Module parameters
all hybrid parameters HV + Ileak Full readout LED and perhaps laser response
= 6 parameters (measured with scopes)
Reminder: one SINGLE shot full qualification!
Carrier 2&3: Sensor+module will sum up to 30 scope channels!
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General Tracker Meeting 07/2002Frank Hartmann
Readout adventureReadout over 30m of cables!1. Optical readout:
Most promising and probably the only reasonable– Still parts missing– So far NO experience in KA
2. Cat. 7 network cable (needed anyhow for control) (backup 1)
3. PC in the „hot“ area, controlled via LAN (backup2)
Cables have to be installed!Power supply combined effort with ATLAS
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General Tracker Meeting 07/2002Frank Hartmann
Set up of One-shot beamTime required =1.5 days
Conditional on successful replacement of PS power supply and re-establishment of
slow extraction beam line
FIRST 100ns beam extraction ever done at the PS (standard ~ms)
Possible time slots
Duration =8 hours (max)
One shot schedule
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General Tracker Meeting 07/2002Frank Hartmann
Summary• Our electronics plus detectors should be prepared
to survive fast pulses with several orders of magnitude higher particle rates than in nominal conditions.
• We „SHOOT“ a hybrid, 2 modules, 3 sensors with 1011 protons several times varying the bias voltage!
• We are aware that the existing program is very ambitious and the available time is tight, therefore help is welcome!
• Additional ideas/devices like a CCU is feasible, if additional groups join the venture!
• Scopes still needed!• The project is a joint adventure of CMS & ATLAS• The LHCC referee welcomes the project