# Presentation: 146441

## Timing for MuCool

***FAST TIMING DETECTOR ***
***for Ionization Muon Cooling Experiment***
*Presented by Yu.Pischalnikov*
* **UCLA*

## Ultra-High-Speed TOF for MuCool

- For non-bunched beam (single particle experiment), MuCool requires arrival-time tagging of muons to _**__*~10 ps*_.
- This is 3-5 X better than has been done for small systems
- Plan is to use commercially available components and try to extend their performance range

**30 ps timing stations T0-T3**

## Fast Timing Cerenkov Detector (FTCD)as a Ultra-High-Speed TOF for MuCool

***Fast Timing Cerenkov Detector (FTCD)****as a Ultra-High-Speed TOF for MuCool*

- Technical concept of Fast Timing Cerenkov Detector
*Direct image MgF**2** Cerenkov disk using CsI PC*
*Electron multiplier - micro-channel plate (MCP/MSP)*
*50 ****High frequency anode/connectors/cabling*

***Basic Structure***
- UHV enclosure
- Cerenkov radiator
- 2-5 mm MgF2
- CsI Photocathode
- MCP stack
- 50 Ohm anode

## Fast Timing Cerenkov Detector 

***Fast Timing Cerenkov Detector ***

- _Why we are optimistic _
- For 5 mm MgF2 radiator t = _***3 ps***_
- For CsI PC (120-200nm & QE~20%)
- expect _***70 p.e.***_
- MCP PMTs (HAMAMATSU R3809U)
- Gain: 2105
- Rise Time: 150ps
- T.T.S. (for single p.e.) ********* 10ps***
- GALILEO MCPs (chevron&Z-stack)
- Gain : 106 -108
- Rise Time: 450ps

- MCP TOF Detector for Ions   Kraus et.el, NIM A264 (1988) 327
- Large area TOF detector *********=50ps***

## A MicroSphere Plate (MSP) is a compact electron multiplier and as expected less effected by magnetic field.El-Mul Technologies Ltd. (Israel)

- _A MicroSphere Plate (MSP) is a compact electron multiplier and as expected less effected by magnetic field.__El-Mul Technologies Ltd. (Israel)_

- _Galileo MCP _
** **_Hamamatsu MCP_
** ****25-33-50mm Quality Diameter **
**6-10 ********m Pore, **
**5-8-13****o**** Bias **

*Electron multiplier -*
* **micro-channel plate (MCP/MSP)*

## Status of Fast Timing CD

- Mechanical assembly design progressing

*MCP HV*
* **feedthrough connector*

*PC HV feedthrough *
*connector*

*Anode + *
*25GHz connector*

*to pump*

*UHV enclosure*

*MgF**2** Substrate(changeable)*
*(as a cerenkov radiator)*
*+ CsI photocatode*

*MCP stack (changeable)*
* **(chevron or Z)*

*Input window*
*(quartz)*

## Status of Detector assembling(mechanics)

## Cerenkov Radiator +Solid CsI Photocathode

- MgF2 (Polished Magnesium Fluoride Substrate) from Bicron (2&5mm thick  Ø = 25, 33, 50mm)

- For 5 mm MgF2 radiator t = _***3 ps***_
- For CsI PC (120-200nm & QE~20%)
- expect _***70 p.e.***_

- D.Anderson, S.Kwan, V.Peskov)

- photoelectrons

- photoelectrons

- MgF2

- Cr (metal film)

- CsI

**Al ring**

- FNAL LAB7 Facility
- (Vacuum Deposition/Thin Film Coatings )
- 1.   Cr film and Al ring sputtering on substrate
- 2.   Re-furbishing CsI evaporation setup

## Test of Cerenkov Radiators+CsI photocathode (LAB6 facility)

## Chambers for CsI efficiency measurements

*Chambers for **CsI efficiency measurements*

## Test of Cerenkov Radiators+CsI photocathodeTransmittance of MgF2 for Cerenkov radiation

## Test of Cerenkov Radiators+CsI photocathodeTransmittance of MgF2+Cr film for Cerenkov radiation

## Status of Fast Timing CDElectronics 

*Timing measurements from Prototypes*
- Digital Scope and/or
-  Conventional TDC (and/or Stretcher)

*Front-end and DAQ electronics*
-      Hypres progress - second step of SBIR
-      (development of 2ps analog prescale)
-      considering possibilities to use D0
-      VLPC test cryostat for Hypres electronic;
-     Conventional TDC (and/or Stretcher)

- Demonstrated 32 GHz TDC
- Proposing 2 ps with analog prescale

## Tests of DetectorsComing in October-November

***Tests of Detectors******Coming in October-November***

- Cosmic ray setup

*Start*

*Stop*

*204nm*

*408nm*

- PiLas

- Stop

- Start

- BENCH TEST

*Digital*
*Scope*

*Laser*
*60ps pulse*
*10ps trigger jitter*