Fast BLM acquisition system
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Fast BLM acquisition system
Fast BLM acquisition system, B.Dehning 1
Bernd DehningCERN BE/BI
Plots are taken from:
Tobias Baer, Henrik Janson, Maria Hempel, Elena
Castro, Christoph Kurfuerst
BI-TB, 03. 04. 2014
Content
The diamond detector CERN installations Specification
Signal versus time Arrival time histogram
Acquisition systems
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 2
IC Diamond PM (ACEM) Response time: 100 ns < ns ns Pulse duration: 100 us 5 ns few ns Dynamic 9 orders 9 orders 3 orders
Radiation tolerance 100 MGy several 10 MGy 100 kGy Volume 1l 0.1 cm3 100 cm3
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 3
Beam loss sensors
MGy
Signal degradation factor 10
50 ns bunch spacing
Risetime: 2.34nsFalltime: 10.34nsAmplitude: 397mVBackground noise: 9.9mVTemporal width: 6.06ns
CVD detector superior in terms of response time,
pulse duration and dynamic range
Leakage current
Max 20 pAOften it is the case that the acquisition chain is limited by the sensor; diamond sensor (CVD) exploitation requires high performance electronics
BLMED Installation Overview
Acc IP Position Detector
LHC 2 BLMED.04L2.B1I10_TCTVB.4L2 CIVIDEC
LHC 3 BLMED.06L3.B1I10_TCP.6L3.B1 CIVIDEC
LHC 3 BLMED.06R3.B2E10_TCP.6R3.B2 CIVIDEC
LHC 6 BLMED.04L6.B2I10_TCSG.4L6.B2 CIVIDEC
LHC 6 BLMED.04R6.B1E10_TCSG.4R6.B1 CIVIDEC
LHC 7 BLMED.06L7.B1E10_TCHSS.6L7 CIVIDEC
LHC 7 BLMED.06R7.B2I10_TCHSS.6R7 CIVIDEC
LHC 8 BLMED.04R8.B2C10_TCTVB.4R8 CIVIDEC
SPS 4 MSE 41876 CIVIDEC
SPS 6 TPSG 61773 CIVIDEC
LHC 2 BLMED.04L2.B1C10_TDI.4L2.B1 BCM1F4LHC
LHC 8 BLMED.04R8.B2C10_TDI.4R8.B2 BCM1F4LHC
LHC 4 BLMED.05L4.B1C10_BGI BCM1F4LHC
LHC 4 BLMED.05R4.B2C10_BGI BCM1F4LHC
LHC 5 BLMED.04L5.B1I10_TCTVA.4L5.B1 BCM1F4LHC
LHC 5 BLMED.04R5.B2I10_TCTVA.4R5.B2 BCM1F4LHC
• Following detectors are foreseen to be installed during LS1 and LS2:
• 1 detector for Fast Servo spill in the SPS TT20 (LS1)• 1 detector for HiLumi in the LHC (LS1)• 8 detectors for Booster dump (LS2)• 10 (12) Detectors for PS (LS2)
BI-TB, 03. 04. 2014 4Fast BLM acquisition system, B.Dehning
Location of Diamond Detectors at CERN Accelerators
31.10.2012 Status and Application of Diamond BLMs; B.Dehning 5
Location of Diamond Detectors at CERN Accelerators
31.10.2012 Status and Application of Diamond BLMs; B.Dehning 6
Optical diamond detector
(BCM1F4LHC)
• All detector signals arrive at the same position
• Easy access of data acquisition system
• Lower dynamic range
BI-TB, 03. 04. 2014 7Fast BLM acquisition system, B.Dehning
31.10.2012 Status and Application of Diamond BLMs; B.Dehning 8
Tunnel set ups
CIVIDEC system
CMS DESY/Zeuten system
Optical fibre
Technical Specification of Fast DAQ
Analogue bandwidth DC – 500 MHz V In min 10 mVpp V In max 10 Vpp 7V RMSAcquisition: Resolution 8/10/12 bit Solution specificSampling rate 1Gs/s (2.5ns – 1ns)Sampling length 10ms -1.0s @ 1Gs/s per channel selectable
Buffer @ 8 bit10k – 1G (points) = 240kbit – 24Gbit (4Gbyte) 4 Channels
Buffer@ 12 bit 10k – 1G (points) = 360kbit – 36Gbit ( 3 Channels Trigger system: Signal input Edge (Threshold set with 10bit DAC) Min. 5mVExt. Input 2 Edge TTL signalSoftware trigger On event via data transmissionHistogram: Resolution 1.55671875ns (57024 bins) Bunch length / 16Trigger threshold min. 5mV 10 bit DACCounter 20-24 bit per bin Update rate 1s Scaler: Trigger threshold min. 5mV 10 bit DACCounter 20-24 bit Update rate 1s Controller or FPGA software: Source code User accessible for modifications Preferable Drivers & Control software Driver Open source Linux PreferableControl Linux Preferable
BI-TB, 03. 04. 2014 9Fast BLM acquisition system, B.Dehning
Specification
Sampling frequency, bandwidth 500 MHz analogue bandwidth relates to a rise time of 0.7 ns (10 – 90%) Rise time observation 2.3 ns, limited by 1GHz sampling frequency and
cable, rise time contribution from analogue part of acquisition almost negligible
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 10
PS SPS LHCDynamic [orders of magnitude ] 5-6 5-6 5-6
Sampling frequency [GS/s] 1 1 1
Number of value to be stored per channel
2E6 22E6 1E9
Synchronisation with machine events
y y y
Signal versus time acquisitions
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 11
September, 18th 2012 12Tobias Baer
Diamond Measurement 4 batches
4·36 bunchesLHC injection gap
36 bunches
SPS injection gaps
September, 18th 2012 13Tobias Baer
Diamond Measurement 1 batch
36 bunches50ns spacing between bunches
All bunches contribute to the beam losses, as expected for a macro particle interaction.
LHC Machine CommitteeAugust, 2nd 2012 14
Event Sequence
Start of B1 losses in IR7.
0
Fire M
KD.B
2
8/8 turns
IR1
IR6
IR7
IR5
IR3
IR4
IR2 IR8
3/8
No IR5
bb ki
ckLo
sses
in IR
71/8
Pacman structure of beam losses.
LHC Machine CommitteeAugust, 2nd 2012 15
Event Sequence
Losses due to uncaptured beam in abort gap duringMKD rise time observable in IR7.
0
Fire M
KD.B
2
8/81/8
IR1
IR6
IR7
IR5
IR3
IR8
IR4
IR2
3/8
No IR5
bb ki
ckLo
sses
in IR
76/8
No IR2
, IR1,
IR8 b
b kick
Dump l
osse
s
LHC Machine CommitteeAugust, 2nd 2012 16
Event Sequence
Losses due to uncaptured beam in abort gap duringMKD.B1 rise time observable in IR7.
0
Fire M
KD.B
2
8/81/8
IR1
IR6
IR7
IR5
IR3
IR8
IR4
IR2
3/8
No IR5
bb ki
ckLo
sses
in IR
76/8
No IR2
, IR1,
IR8 b
b kick
Dump l
osse
sB2
dum
ped
Fire M
KD.B
1
10/8
Dump l
osse
s
Bucket counting on consecutive turns
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 17
MKI UFO dump which illustrates the timing. The data is acquired by the IR7 diamond BLM for B1. The yellow line shows the losses during the last turn incl. the spike due to the MKD rise time. As reference in red the losses around the abort gap in the previous turn. One can see that the losses which are observable in IP7 occur about 875ns after the beginning of the abort gap and about 1.8us after the last bunch.
SPS 5 ns bunch structure measureable with 150 m of Cu cable
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 18
CNGS - SPS extracted pulse
10 us 5 ns
September, 18th 2012 19Tobias Baer
Ring BLM Measurements
Spatial loss profileUFO Location: BSRT.05L4.B2
Temporal loss profile
On the following slides: Measurements with BMLED.06R7.B2I10_TCHSS.6R7.B2. 40dB signal amplification.
B1B2
UFO location
Diamond BLMB2 direction
September, 18th 2012 20Tobias Baer
Diamond Measurement Overview
1 turnLosses due to beam dump
September, 18th 2012 21Tobias Baer
Diamond Measurement 1 turn
1 turnLosses due to beam dump
Beam abort gap
4·36 bunches2·36 bunches
The data was taken during the EOF test of the beam-beam MD on 13.12.2012, where B2 was dumped first, which led to a coherent oscillation of B1 due to the missing LRBB deflections.
The frequency resolution is limited, because the losses were acquired for only ~200 turns.
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 22
Bunch by bunch tune measurement
The duration of recording (1s) determines
the required memory size
(IEC team, T. Pieloni)
Arrival time histogram referenced to revolution period
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 23
LMC 10.02.2010 B.Dehning 24
HERA Scraping Beam with Wires HERA
Bunch spacing 96 ns Samples taken every 21 ns
No coasting beam halo 3 samples with zero intensity
(left, top) Partially coasting halo
Inter bunch samples measure
intensity (left, middle) Only coasting halo No observation of bunch structure
(left bottom) Strong coasting component at
begin of fill (centre top) Bunched halo only minutes
later (centre, middle) With retracted wire diffusion
of coasting component into
cleaned area (centre bottom),
SPS
Effect caused by RF system
noise, faulty amplifier
Halo
Inte
nsi
ty
Inner wire
Outer wire
Outer wire
wire ~ 4 sig
wire ~ 4 sig
wire ~ 6 sig
begin fill
4 min later
wire retracted
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 25
Arrival time histogram IP5 CMS system
Allows details of bunch spacing
With 25 ns spacing and debris from
the IP spacing reduced to 12.5 s
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 26
Arrival time histogram with simulated and CVD signal
Bunch period
signal at input of
acquisition system
CVD detector
signal at input
acquisition system
Arrival time histogram during ramp
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 27
Bunch spacing reduced due to cross talk
Sub 25 ns resolution required
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 28
Arrival time histogram - Coasting beam and instabilities
By continues updated display observation of all bunches possible
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 29
Arrival time histogram with the CMS system
IP2, 5 and 8 losses from tails and experiment
IP4 losses from core of beam
Arrival time histogram & injection losses
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 30
Before injection
Arrival time histogram & injection losses
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 31
After injection
Arrival time histogram & injection losses
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later after injection
Clean injection check should also be possible at the PS and SPS
New Diamond Detector Cascade
Schemes
• Detector signal split in two signal paths (direct and 40dB amplified)
• Monitoring of complete dynamic range possible
• No need to access tunnel to exchange amplifier for different users
BI-TB, 03. 04. 2014 33Fast BLM acquisition system, B.Dehning
tunnel side tunnel
System propositions • 8 - 10 - 12 bit
solution possible
• 3 – 4 channel per system needed
• Splitter and/or optical input
• can be separated form DAQ
• In case of a modular system more than 4 channel possible
• Parallel processing of histogram and loss versus time mode preferable
BI-TB, 03. 04. 2014 34Fast BLM acquisition system, B.Dehning
System Comparison
BI-TB, 03. 04. 2014 35Fast BLM acquisition system, B.Dehning
OASIS 250kbyte 8 bit 1-2 GSPS
No Yes No The FPGA can not be programmed
SystemImportant Technical Aspects BI/BL Man power Dead
lineComments
Storage per Ch
Resolution Rate FPGA CPU
Production
BI/BL 8 MByte 10 bit 1 GSPS Yes Yes Yes No Tender for FMC neededTender
1 1.25 GByte 10 bit1.25 GSPS No Yes No No Offer is without chassis and CPU
Tender 2 2 GByte 12 bit
1.6 GSPS Yes Yes No Yes
Modular system, Onsight consualtion
Tender 3 4 GByte 8 bit
1.25 GSPS No No No Yes QT GUI exist, Future option 12 bit
Tender 4 1.5 GByte 12 bit 1 GSPS No No No Yes Completely new development
Tender 5 250 MByte 12 bit 1 GSPS No No No Yes Future option 8 Gbyte
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 36
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 37
CMS system
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 38
IP4 abort gap recording
Cross talk from other beam dominant
BI-TB, 03. 04. 2014 Fast BLM acquisition system, B.Dehning 39
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