# Presentation: 397172

## The High-Power Target Experiment at CERN

-         Report to MUTAC
-                   LBNL
-           April 25, 2005

## The Goal: Intense Secondary Beams

- World-wide interest in exploring new physics opportunities via intense new beams
-      Kaons
-     Kopio—BNL
-     CKM—FNAL
-     LOI’s 4,5,16,19,28 – JPARC
-     Neutrons
-     SNS
-     JAERI/JPARC
-     Neutrinos
-     Numi—FNAL
-     BNL to Homestake
-     T2K -- JPARC
-     Muons
-     g-2 – BNL
-     Meco – BNL
-     Sindrum--PSI
-     Prism- JPARC
-     Neutrino Factory/Muon Collider

## Achieving Intense Muon Beams

- Maximize Pion/Muon Production
- Soft-pion Production
- High Z materials
- High Magnetic Field

## Neutrino Factory Feasibility Study 2 

**AGS**
**1.2 GeV ******** 24 GeV**
**0.4 s cycle time (2.5 Hz)**

**116 MeV Drift Tube Linac**
**(first sections of 200 MeV Linac)**

**BOOSTER**

**High Intensity Source**
**plus RFQ**

**Superconducting Linacs**

**To RHIC**

**400 MeV**

**800 MeV**

**1.2 GeV**

**0.15 s**

**0.1 s**

**0.15 s**

**To Target Station**

- Six 17 TP pulses at an
-  effective 50 Hz rate

**AGS Proton Driver 1 MW Scenario**

## The SPL Neutrino Horn

- Protons

- I =   300 kA

****

**B********1/R**

**B = 0**

- Hg Jet

- 2.2 GeV
- at 4MW
- 50 Hz
- operation

## Proposal to Isolde and nToF Committee

- Participating Institutions
- RAL
- CERN
- KEK
- BNL
- ORNL
- Princeton University

- Proposal submitted April 26, 2004

## Approval --- April 5, 2005

## Profile of the Experiment

-  24 GeV Proton beam
-  Up to 28 x 1012 Protons (TP) per 2s spill
-  Proton beam spot with r ≤ 1.5 mm rms
-  1cm diameter Hg Jet
-  Hg Jet/Proton beam off solenoid axis
-   Hg Jet 100 mrad
-   Proton beam 67 mrad
-  Test 50 Hz operations
-  20 m/s Hg Jet
-  2 spills separated  by 20 ms

## PS Beam Characteristics

-   PS will run in a harmonic 8 mode
-  We can fill any of the 8 rf buckets with 4 bunches at our discretion.
-  Each microbunch can contain up to 7 TP.
-  Fast extraction can accommodate entire 2s PS fill.
-  Fast kicker capacitor bank recharges in 11 ms
-  Extraction at 24 GeV
-  Beam on target April 2007

## PS Extracted Beam Profile

## Peak Energy Deposition

- Neutrino Factories
-     Hg target; 1 MW 24 GeV proton beam; 15 Hz
-              1cm diameter Hg jet ; 1.5mm x 1.5mm beam spot        100 J/g
-     Hg target; 4 MW 2.2 GeV proton beam; 50 Hz
-               2cm diameter Hg jet;  3mm x 3mm beam spot             180 J/g
- E951
-     Hg target; 4 TP 24 GeV proton beam;
-            σy=0.3mm x σx=0.9mm rms beam spot                             80 J/g
- CERN PS (projected)
-     Hg target; 28 TP 24 GeV proton beam
-            1.2mm x 1.2 mm rms beam spot                                     180 J/g

## Run plan for PS beam spills

- The PS Beam Profile allows for:
-  Varying beam charge intensity from 7 TP to 28 TP.
-  Studying influence of solenoid field strength on beam dispersal
-         (vary Bo from 0 to 15T).
-  Study possible cavitation effects by varying PS spill structure
-         (Pump/Probe)
-  Study 50 Hz operation.

## Target Test Site at CERN

## Location of the nTOF11 Experiment

**TT10**

**TT2**

**TT2A**

**ISR**
**(Control Room**
**Location)**

**TT2**
**Access**

**Shield**
**Blocks**

**nTOF11**

**Floor Step**

## Surface above the ISR

**6000 l Dewar**

- Access
- Route

- One 18kV
- Sub-station

## Power Converter (From SPPS Transfer Line) 

**Power Converter ****(From SPPS Transfer Line)**
**8000 Adc, 1000 Vdc **

**Global view**

**Rectifier bridges**

**Passive filter**

**Passive filter capacitors**

**self**

**capacitors**

**DC output**

***Strategy:***
*** ******Refurbishment of the West Area Power Converter, making it compatible with the project requirements***

## The Experimental Installation Point

**The Experimental Installation Point**

##     The Experimental Footprint

- 24 GeV
- Protons

## The Hg Jet System

- Double Containment System, with snout inserted into magnet.
- Mercury inventory ~ 20 liters.
- Hydraulic system can deliver up to 1000 psi, to propel mercury at > 20 m/s

## Primary Containment – Side View

## Primary Containment Cross Section

## Optical Diagnostics: Retroreflected Illumination

- Spherical mirror

- laser
-  illumination

- image
-  collection

- fiber bundle

- lens

## Princeton Nozzle R&D

- Replaceable Nozzle Head

- 20 HP Pump

- Lexan Viewing Channel

## The Target Test Facility (TTF) - Basis For ORNL’s Hg Handling Experience

- Full scale, prototype of SNS Hg flow loop
- 1400 liters of Hg
- Used to determine flow characteristics
- Develop hands on operating experience
- Assess key remote handling design issues

## High-field Pulsed Solenoid

-   LN2 Operation
-   15 T with 5.5 MW Pulsed Power
-   15 cm warm bore
-   1 m long beam pipe

- Peter Titus, MIT

## Pulsed Solenoid Performance

**15T Peak Field with 5 MVA PS at 80****O**** K**

##    Fabrication of the Cryostat

- CVIP has been awarded the contract.

- The Cryostat pressure vessel
- Photo taken April 12, 2005

## Coil Fabrication

- The three coil sets
- Photo taken April 12, 2005

- Everson Tesla, Inc has been sub-contracted to fabricate the coils

## Cryosytem Layout

- LN2 and He gas stored
- on the surface.
- Cold valve box in the
- TT2 tunnel.
- Exhaust gas vented to
- surface through
- filtration system.
- ~ 150 liters of LN2 per
- Magnet pulse.
- Magnet flushed with He
- prior to each pulse, to
- minimize activation of
- N2.

## System Commissioning

-  Ship Pulsed Solenoid to MIT                       July 2005
-  Test Solenoid to 15 T peak field              August 2005
-  Test Cryogenic valve box                   September 2005
-  Integration of Solenoid/Hg Jet system   Summer 2006

## High-Power Target Experiment

- Budget agreed to by the Collaboration Technical Board on Sept. 22, 2004.
- Subject to continued flat funding from US DOE.

|  | FY05 | FY06 | FY07 | Total |
| --- | --- | --- | --- | --- |
| Magnet Systems |  |  |  |  |
|         Solenoid Testing | 100 |  | 100 | 200 |
|         Cryogenics | 25 | 325 | 200 | 550 |
|         Power Supply | 340 |  |  | 340 |
|         PS Installation |  |  | 50 | 50 |
|         Decommission |  |  | 30 | 30 |
| Hg Jet |  |  |  |  |
|       System Integration | 85 | 75 | 50 | 210 |
|       Nozzle R&D | 25 | 25 |  | 50 |
|       Optics |  | 25 |  | 25 |
|       Fabrication |  | 40 |  | 40 |
|       Decommission |  |  | 30 | 30 |
| Project Management | 53 | 75 | 40 | 168 |
| Simulations | 50 | 50 | 50 | 150 |
| Experiment Operations |  |  | 50 | 50 |
| Total | 678 | 615 | 600 | 1893 |

## Summary

**The CERN nTOF11 experiment is now approved to demonstrate a mercury jet target in a 15-T solenoid plus an intense 24-GeV pulsed proton beam.**
**An international collaboration has completed the design of all major components:**
**Mercury delivery system (ORNL, Princeton)**
**Optical diagnostics (BNL)**
**15-T, LN2-cooled pulsed solenoid magnet (MIT)**
**5-8 MVA power supply (BNL,CERN)**
**LN2 cryogenic system (CERN, RAL)**
**The budget is in place to complete fabrication, commissioning and operation of the experiment over the next 2 years.**
**Completion of this experiment in 2007 will bring a successful close to a major phase of R&D for a Neutrino Factory based on a muon storage ring.**