E L E C T R O N I C R E Q U I R E M E N T S F O R T H E I A R & D AT B E R K E L E Y

J A V I E R C A R A VA C A , B E N J A M I N L A N D , G A B R I E L O R E B I G A N N

A T O U R F O R T H E I A R & D AT B E R K E L E Y

2

2) Light setup Measures the scintillation

light yield 6 10inch-PMTs R7081

1) Timing setup Cherenkov/Scintillation

separation from vertical cosmics 12 1inch-PMTs H11934

Veto panel

Veto

pan

el

Veto panels underneath

FE panel

A T O U R F O R T H E I A R & D AT B E R K E L E Y

3

2) Light setup CAEN digitizer V1730 (500MHz)

1) Timing setup CAEN digitizer V1742 (5GHz)

Buffer limited to 1024 samples → ~200ns event window

VME crate

FE panel

4

T H E T I M I N G S E T U P

Target filled with WBLS

Muon tagsOptical propagation

medium

PMTs

Trigger off the muon tags on vertical cosmics

5

T H E T I M I N G S E T U P

Target filled with WBLS

Muon tagsOptical propagation

medium

PMTs

Trigger off the muon tags on vertical cosmics

LAB+PPO simulation

P R O J E C T E D P E R F O R M A N C E S O F O U R C U R R E N T S E T U P

6

LAB+PPO

Detected PE time, ToF corrected (ns)

Simulation includes most of the DAQ effects → PMT TTS, realistic pulses,

electronic noise, …

Simulation

C H E R E N K O V V S S C I N T I L L AT I O N

t(ns)∆0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

PE/E

vent

/20p

s

0

0.1

0.2

0.3

0.4

0.5

0.6

t(ns)∆5.5 6 6.5 7 7.5

PE/E

vent

/20p

s

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

t(ns)∆0 50 100 150 200 250 300 350 400 450 500

PE/E

vent

/20p

s

3−10

2−10

1−10

1

10

Solid - Cherenkov Dash - Scintillation

Typically <ns difference

Scintillation tails extendsto ~400ns

With PMT TTS (0.3ns)W/o PMT TTS

Detected PE time

Detected PE time

7

C H E R E N K O V V S S C I N T I L L AT I O N

t(ns)∆0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

PE/E

vent

/20p

s

0

0.1

0.2

0.3

0.4

0.5

0.6

t(ns)∆5.5 6 6.5 7 7.5

PE/E

vent

/20p

s

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

t(ns)∆0 50 100 150 200 250 300 350 400 450 500

PE/E

vent

/20p

s

3−10

2−10

1−10

1

10

Solid - Cherenkov Dash - Scintillation

Typically <ns difference

Scintillation tails extendsto ~400ns

With PMT TTS (0.3ns)W/o PMT TTS

Detected PE time

Large buffers > 400ns

Detected PE time

Fast sampling rate ~10GHz (0.1ns)

8

C R I T I C A L P O I N T S

• Sampling rate

• Currently working at 5GHz → 0.2ns resolution

• The current limiting factor is the PMT TTS ~ 0.3ns

• Getting to 0.1ns would neglect the source of error coming from the electronics

• Buffer size

• Not catching the whole scintillation light (~400ns) would lead to systematics in the light yield measurements

• Preferably larger than 400ns to allow for direct pedestal correction

9

D Y N A M I C R A N G E

• Handling single and multi PE at a time requires a broad range with a good enough resolution

• A 2V range with 12 bits resolution (0.5mV) has demonstrated to be sufficient

Coincidence event

<0.5mV

~10mV (gain dependent)

10

T R I G G E R I N G C A PA B I L I T I E S

• Customizable global trigger

• Issue from any of the channels

• Coincidence & anti-coincidence from two or more channels

• Rising or falling edges

• Configurable threshold

• On-board pedestal correction

• Trigger delay: useful for synchronization with external triggers

• Clock

• Synchronization capabilities: for event correlation between devices

• Timestamp rollover>hours → 50bit 10GHz would be ideal

11

S U M M A R Y

• Fast digitization is crucial for this project as well as a large enough buffer

• Scalability is a plus → Currently using 25 channels. Might be extended to >30.

• Requirements

12