# Presentation: 485308

## Targetry

- Steve Geer                                            BNL Visit                         November , 2005

- NuMI Target Studies
- Existing Areas of Collaboration   Material Studies   MERIT Experiment

## INTRODUCTION

- Targets for high-power beams are already a challenge. To make sure we can exploit increased beam power we must invest in targetry (& related) R&D.
- This is particularly important for the future neutrino program. There are already some areas of BNL-FNAL collaboration on targetry R&D.
- To stay ahead of the beam-power curve for the NuMI program we are looking at what will fail when, & how we might upgrade for higher intensities.  This is a crucial activity & we would welcome exploring potential BNL-FNAL collaboration in the related studies.

## NuMI Targetry Issues

- Assume 2MW of beam power becomes available
- Determine inadequacies in existing facilities
* **Initiated engineering studies : NuMI neutrino beam*
* **Identify the level (0.4 to 2MW) where component fails*
* **Complete by June 2006*
- Address inadequacies (incr. cooling capacity, design changes...)

- Present study being coordinated by  Byron Lundberg

## NuMI Targetry Issues - 2

- Present NuMI primary proton target:
-  Graphite  3 KW load in 0.4 MW 120 GeV beam
-  1mm s(*x,y*) - small beam size
-  Movable, inserted into Horn for LE n  beam
- For 2 MW:
- Design depends on primary beam energy
- Solid (graphite/Be?) still OK at ~20 KW loading but...
- Power density needs to be reduced by 5
-  bigger beam + less beam per msec
- Low E : target integrated with Horn;   Hi E : not

## NuMI Targetry Issues - 3

-  Completed analysis of 680m decay pipe
-  Presently analyzing proton dump and target chamber cooling
-  Target design continues to evolve - more robust versions of current design

## MATERIAL IRRADIATION STUDIES FOR HIGH-INTENSITYPROTON BEAM TARGETS

**MATERIAL IRRADIATION STUDIES FOR HIGH-INTENSITY****PROTON BEAM TARGETS**

**Initiated by the Neutrino Factory & Muon Collider Collaboration.****Strategy: Irradiate new promising materials & measure resulting mechanical****properties in a hot cell:      BNL, Princeton, SLAC, KEK, FNAL **

_**What we hope to get out of it ?**_
**Shock induced failure**
**- Information regarding damage at different doses and at different different ratios of protons to neutrons**

**Future target studies at FNAL AP-0****(N. Mokhov, P. Huhr)**

## Existing Collaboration – Material Studies

*After Collider Run II ends, AP-0 could be converted into Target Test Facility. Some minor kicker changes could allow full NuMI beam to be delivered to tests at AP-0 (as NuMI operations allow)** *
*Just after Run II:*
*120 GeV*
*7.5-10 e12 ppp*
*0.5 Hz*
*Sigma 0.1 - 5 mm (2,000 - 3,000 J/g in Ni)** *
*After proton intensity upgrade **(proton driver, proton accumulator):*
*120 GeV*
*2.2 MW*
*0.75 Hz*
*Sigma ??*

- P. Huhr: Accelerator Division Mechanical Support Group

## Existing Collaboration – MERIT

- Initiated by the Neutrino Factory & Muon Collider Collaboration.
- 24 GeV CERN PS beam on a free 20m/s Hg-jet target in a 15T solenoid.
- Approved and to run in 2007.
- Up to 2.8  1013 POT in a 2s spill
- Lead Lab is BNL (H. Kirk).
- Fermilab involvement is new:
- N. Mokhov, S. Striganov, D. Jensen
-  MARS Simulations to predict dosesand fluxes
-  Considering possiblity of scintillation counters to monitor flux from target.

## FUTURE HOPES

- Explore collaboration on NuMI related studies.          Example: Target cooling for a 2MW beam
- Consolidate new (modest) FNAL involvement in MERIT
- Perhaps think about Hg  with a magnetic horn ?