# Presentation: 462289

## Need for New Ideas and Options

**Rashid Djilkibaev **
**New York University**

## History of Lepton Flavor Violation Searches

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- 1

- 10-2

- 10-4

- 10-16

- 10-6

- 10-8

- 10-10

- 10-14

- 10-12

- 1940       1950       1960        1970       1980        1990       2000        2010

**History of Lepton Flavor Violation Searches**

-    - N  e-N   +  e+   +  e+ e+ e-

-   K0 +e-   K+ + +e-

- MEGA

- SINDRUM2

- Branching Fraction Upper Limit

- MEG    goal

- MEC goal

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## SUSY Predictions for LFV Processes 

**SUSY Predictions for LFV Processes **

**Slepton mixing **

| Process | Current Limit | SUSY level |
| --- | --- | --- |
|  | 10-12 | 10-16 |
|  | 10-11 | 10-14 |
|  | 10-6 | 10-9 |

-        100                  200                   300                        100                   200                  300

- Re

- B(  e )

- MEG phase 2goal (start 2006)

- MEC goal

- MEGA bound

- SINDRUM2 bound

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## Lepton Flavor Violation

**MEG  experiment (PSI)  =>   Br – 10****-14**
**   ****begin  –  2006,  results  –  2008-2009**
**ATLAS, CMS  (LHC  CERN)**** ****  **
**   ****Beyond Standard Model   -  SUSY, ... **
**   ****begin – 2007, first results – 2009            Int. Lum – 100 pb****-1**** **
**                             ****SUSY c-s ****~**** 20 pb,           Detect ****~**** 2000 events**
**                           ****full intensity – 2009-2011 Int. Lum – 100 fb****-1**** **
**                              ****SUSY LFV c-s ****~ ****20 fb    Detect ****~**** 2000 events**
** ****We will know in 2009  whether LVF   exists  or  not**
** ****Now is not a good time to apply for a new MEC experiment grant**

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## Scenarios for 2009

**                                                           **

| 
MEG    (LVF) | 
LHC   (SUSY) | 
New MEC Experiment |
| --- | --- | --- |
| 
No | 
No | 
Very Interesting |
| 
Yes | 
No | 
Interesting |
| 
No | 
Yes | 
Interesting |
| 
Yes | 
Yes | 
Less Interesting |

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## Muon Electron Conversion Club

**The Muon Electron Conversion Club is an informal structure consisting of volunteers using small fraction of  working time**
**The club goal is to make a new conceptual design for 2009 **
**Why do we need a new design?**
**   ****1)  MELC (MECO) idea was proposed at 1987 – 19 years ago**
**    ****2) MECO cost increased by a factor of 2 due to magnet cost     **
**        ****increase. Magnet – 55 M$, detector – 25 M$,   Total coast – 80 M$ **
**         ****If we can reduce the magnet cost by half it would great **
**         ****for an experiment (50 M$) **
**    ****3)  New idea has appeared – Phase Rotation Linac & Ring (FFAG)**
**          ****to improve muon beam performance **

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## Conceptual Design Issues

**Magnet System**
**Phase Rotation Ring or Linac**
**Proton Beam Time Structure**
**Detector System**

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## Proton & Muon  Beams

**MELC  for Meson Factories  0.6 GeV – 200 ****μ****A (1.2 x 10****15 **** p )  **
**   ****proton beam power - 120 kW**
**    ****muon stopping rate –  10****11  ****muon/sec**
**MECO  for BNL AGS   8 GeV – 4 x 10****13 **** p  **
**   ****proton beam power - 50 kW**
**    ****muon stopping rate –  10****11  ****muon/sec**
**PRISM   for JHP    50 GeV – 4 x 10****14 **** p  **
**   ****proton beam power – 3.3 MW**
**    ****muon stopping rate –  2 x 10****11  ****muon/sec**
**Future upgrade of FNAL  Linac   8 GeV – 1.5 x 10****15 **** p  **
**   ****proton beam power - 2 MW**
**    ****muon stopping rate –  4 x 10****12  ****muon/sec**

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## MIT Design of  MECO Magnet SystemMagnet Cost 55 M$Magnet Cost (M$) ~ 0.5 x E0.66 ~ 15 M$                               ~ 10 + 3 + 5 = 18 M$

- 5 T

- 2.5 T

- 1 T

- 2 T

- 1 T

- 150 MJ stored energy
-   PD-100+TS-15 + DS-35
- 5T maximum field
- Uses surplus SSC cable
- Can be built in industry

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## The MECO Apparatus

**The MECO Apparatus**

- Straw Tracker

- Crystal Calorimeter

- Muon Stopping Target

- Muon Beam Stop

- Superconducting Production Solenoid          (5.0 T – 2.5 T)

- Superconducting Detector Solenoid     (2.0 T – 1.0 T)

- Superconducting Transport Solenoid              (2.5 T – 2.1 T)

- Collimators

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## PRISM  JHP  50 GeV

**FFAG acceptance Horizontal - 35000 ****π**** mm mrad = 100 mm rad**
**                                   ****Vertical     -  3000 ****π**** mm mrad  = 10 mm rad**
**Phase Rotation Values :**
**  ****Pure μ****-**** - beam**
**  ****Suppression of e****-  ****and  ****π****- **

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## MECO Muon Beam & FFAG

**MECO muon beam vertical & horizontal phase space – 400 mm rad**
**     ****Total phase space 100 times bigger than FFAG acceptance **
**FFAG acceptance: vertical -  100 mm rad, **
**                                  ****horizontal – 10 mm rad**

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## MUSIC Project

**MUon Science Innovation Collaboration   - TRIUMF Canada**
**Budget Outline**
**                                          ****MECO                         MUSIC**
**      ****Magnet                       55 M$                          27M$**
**      ****Detector +etc..           25M$                           31M$**
**      ****Cyclotron Modific.    AGS?                          12M$ **
**   **
**       ****Total                          80M$                            70M$**
**       **
**      ****Operation Costs      130M$/year  ?            18M$/ 15 years  **

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## FFAG Questions

**FFAG Matching Phase Space Problem ?**
**FFAG takes care of extinction ?**
**What is gain from narrow ****μ-****beam spread of FFAG ?**

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006

## Conceptual Design Issues

**Magnet System (Cost issue) **
**Phase Rotation Ring FFAG (Matching Phase Space Problem,**
**    ****FFAG take care of extinction )**
**Proton Beam Time Structure (Extinction & Duty cycle issues)**
**Detector System **

- Rashid Djilkibaev, NYU                    Need for New Ideas & Options

- January 11-12, 2006