4-year overview

​

​

​

​

​

Miguel Arratia

January 10, 2025

1

Groups members: current and past

Graduate students

current: Sean Preins, Sebastian Moran, Ryan Milton, Jiajun Huang,� Xilin Liang

previous (& current location): A. Peck (UCR, Dark Matter),� Liam Blanchard (exited PhD, industry)

Postdocs

current: Sebouh Paul, Weibin Zhang.

previous (& current location):� Bishnu Karki (Industry), Barak Schmookler (U. Houston).

Undergrads

current: Mia Macias, Ryan Tsiao, Miguel Rodriguez (post bac)� previous (& current location): : Peter Carney (Caltech), Bruce Bagby Briceño �(UC San Diego), Luis Garabito (Michigan State), Robert Cabral (Indiana U.), Jiajun Huang (UC Riverside), Lucas Fayet-Faber (San Francisco State), Chase Owen* (Navy OST), Youseff Abdelkadous (applying to grad school), Samuel Pare (applying to grad school), Samir Kulkarni (HEP theory @ UCR ), Nihal Gozlukluoglu* (applying to grad school). Visitors*�

Staff: M. Arratia, K. Barish, O. Long

​

2

List main accomplishments in past 4 years

• Pioneered proposals and R&D of SiPM-on-tile technology for EIC calorimetry. This technology is now incorporated into the official design of the backward HCAL, forward HCAL, Insert, and ZDC.
• Led the design of the Insert and ZDC sub-detectors.
• Carried out the TDR simulations for Inser/ZDC, and forward HCAL.
• Completed benchtop R&D and prototype construction at UCR, engaging a large number of students in the process.
• Led several beam tests of prototypes at JLab, BNL, UC Davis Cyclotron, and (planned) BNL NSRL and JLab. Additionally, participated in the ECAL FNAL test. These test involved multiple students.
• Established new collaborations with UCLA on theory of jets and AI/ML.
• Established new collaborations with LLNL focused on AI/ML and EIC R&D. Coordinated student summer visits to LLNL.

​

3

Detector construction plans at campus/lab

• Lead the construction of ZDC and Insert�
• Contribute to construction and Q&A �of forward HCAL, and forward ECAL

4

Key roles in ePIC

• Barish Vice-Chair Elections.
• Arratia: DSL for ZDC & deputy DSL for forward HCAL /Insert

​

5

Key non-EIC accomplishments

JLab:�Nuclear SIDIS measurements (single- and di-hadron). �11 GeV data taken in 2024.

​

STAR:

Jet measurements spin pp. Forward Calorimeter system installation and commissioning and calibration.�

H1�DIS jet measurements with AI/ML unfolding

6

Highlights related to Task 1 & 2�(design and simulation)

7

8

UCR-UCLA workshops, led by Barak

Direct result of those workshops is a complete �DD4Hep model of all forward calorimeter systems

9

The high-granularity calorimeter insert (HG-CALI)

10

“It maximizes coverage close to the beampipe, while solving challenges arising from the beam-crossing angle and mechanical integration.”

�The CALI subsystem is fully integrated in engineering design, project cost & schedule, ePIC collaboration structure, official simulations, etc �

12

Calorimeter Insert was first EIC detector designed using SiPM-on-tile technology�Now used in many subdetectors, including all of HCAL endcaps�

Measuring the highest-energy jets at EIC�High-granularity design for forward jets

Insert is at the heart of forward HCAL

3<η<4

M. Arratia et al. NIMA 1047 (2023) 167866; JINST 18 (2013) P05045; Instruments 2023, 7(4), 43; NIMA 1060 (2024) 169044

13

Forward HCAL at EIC�will use SiPM-on-tile tech�~630k SiPMs (world record!)��Under construction!

Zero Degree Calorimeter

14

S.Paul & M. Arratia NIMA 1060 (2024) 169044�Milton et al. arXiv:2406.12877�

15

ZDC is ~40 m away from center, highly integrated into accelerator

The HEXPLIT algorithm�Exploits subcells defined by overlap in staggered design

16

Product over overlapping cells, j, in neighboring layers

Energy in a given subcell, i

S. Paul, M. Arratia, NIMA 1060 (2024) 169044

Define subcells with overlap and assign weights:

Same event before and after HEXPLIT

17

Staggering + HEXPLIT algorithm lead� to a factor of 2 improvement in position resolution

Similar improvement over range 10-300 GeV

18

19

20

Highlights related to Task 4�(R&D and prototypes)

21

Insert building block studies

Machined at UCR

Light Yield & Time Resolution

​

23

+2V, �3 mm SiPM

Miguel Arratia et al �2023 JINST 18 P05045

JLab test of gen-1 prototype, Jan 2023

24

25

�S. Preins, P. Carney, B. Bagby-Bricueno, S. Paul, Jiajun Huang

Measured energy spectra per layer (4 GeV positron)

“Beam Test of the First Prototype of SiPM-on-Tile Calorimeter Insert for the EIC Using 4 GeV Positrons at JLab”� M. Arratia et al. Instruments 2023, 7(4), 43

​

26

SiPM irradiation test at the 88’’

other members present but not shown in picture: Kumar, Weibin, Barak (lead)

• Team led by Barak prepared testbeam setup and simulations.
• Analysis code for testbench measurements and analysis was developed

27

*unfortunately canceled due to cyclotron shutdown.

SiPM proton irradiation test at UC Davis Cylotron – May 2024

• All SiPM models to be used in all ePIC Calorimeters tested for all fluence range relevant for EIC
• Dark current vs. proton fluence for set overvoltage values, and other measurements done
• High-temperature annealing studies relevant for ZDC are ongoing

​

​

28

29

June 2024

30

31

Parasitic Experiment at STAR Hall

�Goal: test in situ calibration (MIP and π0) and operation stability in EIC-like fluence.� Will run until the end of RHIC in 2025. �First SiPM-on-tile Calorimeter operating in a Collider ever!

32

33

2023

2024-2025

2024

2025

2024

2025

​

​

34

Today

Published

Ongoing�+ �Analysing

Analysing

Analysing

Ready to �go

35

2023

2024

2025

36

“We will design these and attract construction funds to California”

38

Highlights related to Task 6�(HERA-4-EIC)

39

EIC

H1@HERA

Our flagship paper

40

Lepton-jet correlation

41

H1 Collaboration, PRL 128 (2022) 13, 132002

3D (TMD)

1D (pQCD)

Textbook example of “matching” between 1D and 3D frameworks

First time seen!�

42

Undergraduate researchers

43

Luis

Miguel R.

Jay

Undergraduate researchers

44

Ryan

Peter

Bruce

Mia

Youseff

ePIC 3D Animations | Jefferson Lab

45

Novel VR-event display for EIC, released in most-popular videogame platform for free

46

3 EIC User Group Best-talk award�(Luis, Sean and Peter)

47

Leveraged funding (grants due to MRPI project)

48

49

50

Future plans in the EIC program

51

“We will design these and attract construction funds to California”

Backup

53