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

qians@ihep.ac.cn 30th. July. 2020

28 July 2020 to 6 August 2020 virtual conference

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;

2

➢ 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!

➢ 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；

➢ 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

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;

6

➢ 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

7

➢ 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.

8

Test result of the FPMT Sample Simulation result of the FPMT modle

5 T 5.2T

➢ 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.

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;

10

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;

➢ 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.

12

TTSlimit

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;

Single anode

QE:17% P/V@SPE=7； TTS@SPE=200ps； RT=400ps

➢ 4.1 1 inch FPMT prototypes 14

TTSlimit=25ps

➢ 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

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

➢ 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

谢 谢 !

Thanks for your attention!

Any Comment & Suggestion are welcomed!