# Presentation: 026019

## High Energy and Nuclear Physics SciDAC Program

- Vicky White, DOE/HENP
- SciDAC PI Meeting, January 15, 2002

## High Energy and Nuclear Physics SciDAC Program Objective

**To make a step-function leap in our ability to use computation for scientific discovery  in the ****exploration of the**** ****fundamental processes of nature.    **
**Theory**
**Experiment**
**Simulation and Computational Science**
**3-pronged integrated approach to scientific discovery**

## High Energy and Nuclear Physics SciDAC Program

**The HENP SciDAC program consists of 5 projects**
**Science and Simulation of Particle Accelerators**
**complex and expensive tools used throughout DOE for scientific discovery**
**Supernova Science (2 projects)**
**to discover the fundamental mechanisms of these complex natural systems**
**Lattice Gauge Theory calculations**
**to test and explore the Standard Model (QCD) and to interpret NP and HEP experiment results**
**Particle Physics Data Grid  (joint with ASCR)**
**Collaborative tools for large geographical dispersed researchers needing access to data and computing resources**

## Challenges for HENP SciDAC

- Extend our traditions of huge international collaborations for experimental science into Theory and Computational Science
- work in multi-disciplinary teams, build community codes to deal with the size and complexity of the problems
- apply innovative math and computing techniques and algorithms to problems
- work effectively together  (Collaborative Tools/Grid)
- Strive for science deliverables soon and harness all the human and computing resources to meet the science goals

## Challenges for HENP SciDAC

- Evolve the scientific codes to run on the multi-Teraflop computers of tomorrow
- Portable, scalable codes that can use today’s resources for scientific discovery and be prepared for the next generation of computing resources
- Well layered, structured and supported community-wide codes
- Instrumented codes to optimize performance and understand the type of computers that will meet the needs in the most cost effective manner

## Presentations from 2 of the HENP SciDAC projects 

- Both have gone a long way in forming true multi-disciplinary collaborations with strong ties to applied mathematicians and computer scientists
- Both have scientific goals with some short-term results expected, that they will tell you about
**Shedding New Light on Exploding Stars: Terascale Simulations of Neutrino-Driven Supernovae and their Nucleosynthesis (Mezzacappa – PI)**
**Advanced Computing for 21****st**** Century Accelerator Science and Technology (Ryne, Ko – PIs)**

## SciDAC center for Supernova Research (Woosley – PI)

- Funding for 2 labs and 2 universities
- Good start on multi-disciplinary team
- Many applied math and computing challenges
- Synergy with other projects?

- Impact of a supernova on an adjacent star

## National Computational Infrastructure for Lattice Gauge Theory (Sugar- PI)

- Representing ~60 Theorists in the US.  Funding to 3 labs and 6 universities
- National effort to regain US competitiveness
- put in place the software and hardware needed for accurate lattice QCD calculations

## National Computational Infrastructure for Lattice Gauge Theory (Sugar- PI)

- Huge strides made in collaborative approach
- + starting to work with computer scientists on performance metrics and optimization of code
- Accurate computations of important scientific constants requires tens of Tflop years
- Need highly cost-effective Topical Computing Centers for Lattice QCD – aiming at below $1/Mflop and targeting two different machine architectures – (1) Custom built for QCD  and (2) Commodity PC Clusters with low latency networking

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