the r&d of the ultra fast 8x8 readout mcp-pmts · 2.2 fpmt anti-magnetic performance simulation...
TRANSCRIPT
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The R&D of the Ultra Fast 8X8 Readout MCP-PMTs
Sen QIAN ( 钱 森 ),On Behalf of the MCP-PMT Workgroup
Institute of High energy Physics, Chinese Academy of Science
[email protected] 30th. July. 2020
28 July 2020 to 6 August 2020 virtual conference
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Outline
➢ I. The Motivation of the FPMTs;
➢ II. The Simulation of the FPMTs;
➢ III. The Evaluation method for FPMTs;
➢ IV. The Prototypes of the FPMTs;
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➢ 1.1 The design of the 2 inch Fast MCP-PMT
Operation Principle Small Size(proximity focusing)
Large Size(electrostatic focusing)
Dynode
2--H8500
MC
P
2“ Dynode-PMT
3
H8500
20“ Dynode-PMT
2“ MCP-PMT
R12860
20“ MCP-PMT
✔ ️ ✔ ️
✔ ️
IHEP Design: After the successfully 20 inch MCP-PMT R&D, the PMT group in IHEP try to design and produce the 2 inch FPMT,with high QE photocathode, and low cost!
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➢ 1.2 The Ability of the R&D for the MCP-PMTs 4
2” MCP-PMT (2010)
5” MCP-PMT (2011)
Design 2009
8” MCP-PMT (2012-2013)
From 2010-2020,the group prototyps with 2”, 5”,8” and 20” were produced, and the performance were also improved a lot for the good SPE test and High CE MCP modules.
PMTsLarge
MCP-PMT Fast
MCP-PMT
QE @ 400nm 30% 30%
Area 20 inch 2 inch
Anode 1 8X8
RT@1pe 1.5ns 100ps
TTS@1pe ~5 ns ~ 50ps
Gain 1X10^7 1X10^7
DR 50K/PMT 1Hz/mm2
Cost low low
20” MCP-PMT (2017-2020)20” MCP-PMT (2015) The Core technologies for PMTs
The High QE photocathode;
The High Gain low Noice MCPs;
The low radioactive glass;
The Vacuum transfer equipment;
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➢ 1.3 The Roadmap of the R&D of the FPMTs
--There are 5 Core technologies need to develop to produce this new type of 2 inch Fast MCP-PMTs;--We have the experience of the PC, MCP, but need do more research on the Sealing, the Anode, and the Electronics.
High QE Photocathode
High Gain Low Noice MCP
High Vacuum Sealing
Crosstalk-free array Anode
High-density Electronics
5
8X8 Channles,2 inch
4X4 Channles,2 inch
2X2 Channles,1 inch
1 Channles,1 inch
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Outline
➢ I. The Motivation of the FPMTs;
➢ II. The SImulation of the FPMTs;
➢ III. The Evaluation method for FPMTs;
➢ IV. The Prototypes of the FPMTS;
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➢ 2.1 The FPMT simulation models
Cathode
MCP
Anode
Available parameters: Gain, TT, TTS, ER, RT, Electrons angle distribution
Structural parameters are consistent with the samples
④ Single photoelectron spectrum (SPE)
Gain = area
② Spread of TT ③Spread of gainER = Sigma/MeanTTS = Sigma
Read-out analog circuit
⑤ RT from the output signal① Angle distribution of output electrons
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➢ 2.2 FPMT anti-magnetic performance simulation (Application I)
Φ is the angle between the magnetic field and FPMT
The data of FPMT anti-magnetic performance experiment in IHEP
The magnetic field strength when the gain is reduced to 1/100 is used to evaluate the anti-magnetic performance.
----The simulation results are in good consistence with the test results with the same construction modle and sample -------- proving the reliability of the model.----With this correct simulation modles, we can do the correct design for the new construction of different types of FPMTs.
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Test result of the FPMT Sample Simulation result of the FPMT modle
5 T 5.2T
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➢ 2.3 The simulation design of the FPMTs (Application II) 9
The 1-MCP module: Voltage of single channel FPMT:1185V --Gain: 2X10^5
The 2-MCPs module: Voltage of double channel FPMT:1590V--Gain: 2X10^5
TTS=12ps; ER= 43% RT=85ps
TTS=4ps; ER= 18% RT=53ps
----If there is the X10 fast preamplifier for this 1-MCP module, the Gain will achieve10^6 for better SPE test and timing resolution. ----Even without the fast preamplifier,for the experiments not requiring single-photon detection, single-MCP-FPMT may have much better performance.
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Outline
➢ I. The Motivation of the FPMTs;
➢ II. The SImulation of the FPMTs;
➢ III. The Evaluation method for FPMTs;
➢ IV. The Prototypes of the FPMTS;
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NIM-1Start Time
NIM-2StopTime
ΔTT
TDC: 35ps@ LSB
Oscilloscopes: 25ps@ LSB
NIM/TTL Stop Time
SignalStartTime
ΔTT
➢ 3.1 The Fast Timing test with Outside Synchronous trigger 11
Outside Synchronous trigger
The PS laser to operate the FPMT and its Synchronous signal to be the Stop Time;The FPMT anode signal is the Start Time;
The TTS is the sigma of the TT;
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➢ 3.2 The Limit Time Resolution of the FPMTs
----With enough photons, the TTS of the FPMT will get stable value data,the Limit Time Resolution, the best TTS data of the FPMT.----Some FPMT can not test the SPE and the TTSSPE, but can get this TTSlimit Data.
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TTSlimit
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Outline
➢ I. The Motivation of the FPMTs;
➢ II. The SImulation of the FPMTs;
➢ III. The Evaluation method for FPMTs;
➢ IV. The Prototypes of the FPMTS;
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Single anode
QE:17% P/V@SPE=7; TTS@SPE=200ps; RT=400ps
➢ 4.1 1 inch FPMT prototypes 14
TTSlimit=25ps
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➢ 4.2 2 inch 4X4 anode FPMT prototypes 15
RT=250ps
HV=1660V@1×107
The Waveform of the 4X4 readout FPMT prototype
The Gain vs HV of the FPMTs
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TTS=106ps@SPE
TTSlimit=28ps
The SPE of FPMTs The SPE map of 16CH FPMTs
P/V > 2 @SPE
The Time Resolution of the 4X4 readout FPMT prototype
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➢ 4.3 2 inch 8X8 anode FPMT prototypes 17
RT: 500ps
----Due to the impact of the new coronavirus
epidemic(COVID-19), 8x8 anode FPMT
sample tubes are currently being developed,
not achieve our aims on time.
----Only the first version of the prototype has
been obtained, and more work needs to be
improved.TTSlimit=30ps
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谢 谢 !
Thanks for your attention!
Any Comment & Suggestion are welcomed!