# Presentation: 105936

## High-pt Particle identification with Aerogel counter.  

- Aug/06/2002
- PHENIX upgrade Workshop

## Proposed Extension of  PID with Aerogel

|  |  | Pion-Kaon
separation | Kaon-Protonseparation |
| --- | --- | --- | --- |
| TOF |  ~100 ps
 | 0 - 2.5  | - 5 |
| RICH | n=1.00044
 th~34 | 5 - 17 | 17 - |
| Aerogel |  n=1.01
 th~8.5 | 1 - 5 | 5 - 9 |

**Note ; **
**Aerogel **_**together with TOF**_** can extend the PID capability upto 10 GeV/c**
**(Without TOF, no K-proton separation at < 5 GeV/c) **

-  (Red)

- (Bl.)

-  -RICH(Gr.)

**Momentum (GeV/c)**

- 20

**N p.e. per 10cm**

- p(Yel.)

- 3 lines for each PID are for n=1.015, 1.01,1.007)

- Index dependence of threshold

## Design and test results (1) (summary from June/2002 core week)

- Belle-type

- Mirror-type

- Design and test results (1) (summary from June/2002 core week)

_**(1)Reflector:**_
-     Goretex is best among 6 candidates.
_**(2)Position (x) dependence: **_
-     (Belle) >25 p.e. obtained anywhere.
-     (Belle) Empirically exponential [but not necessarily trivial, attenuation might be due to reflector]
-     (Mirror) (~9 p.e.) No significant difference between Flat and Parabola mirrors
_**(3) Thickness (L) dependence:  **_
-     (Belle) # of photon is proportional to the thickness.
-     (Belle) consistent with the facts of;
- 	 position dep. and no directionality
-     (Mirror) difficult to get more p.e.
- 	due to short transmutation.

- λ= 7.0 cm (Goretex)

- Belle-type

- Mirror-type

- Belle-type

**20p.e**

**20p.e**

- Mirror-type

*We had **2** times of KEK beam tests (’01dec & ’02may. a few GeV/c pion)*

- 10cm
- x 10cm

- -3

- +3 (cm)

- 0

- -5

- 5**(cm)**

- 0

- -5

- 5
**(cm)**

- 0

- 25**(cm)**

- 0

- 5

- 15

- L

- x

- Beam

- 

- n = 1.017

- R6233
- (3”,non-UV)

## Design and test results (2) (summary from June/2002 core week)

- Design and test results (2) (summary from June/2002 core week)

_**(4) Angular (**__****__**) dependence: **_
- 	(Belle)No directionality is seen for scattered photon.
- 	(Belle)Effective thickness (1/cos) describes.

**Other type of counter (integral sphere type)**.

**+2 GeV/c**

**20p.e**

_**(1) Position dependence:**_
-  (Integ.) number of p.e. is as many as 20.
-  (Integ.) There is less dependence than Belle-type in beam position both in X and Y.
-  (Integ.) There is less dependence for beam injection direction (10, 9, 9 p.e. for forward, backward, sideward injection, respectively)

- x

- y

**20p.e**

- X(-6 ~ +6cm)

- Y(-3 ~ +3cm)

- There are 3 points in each!

**X**

**	****Overall (via (1)~(4)), ****Using Belle type, > 20 of p.e. is obtained, **
**	****which is consistent with Belle exp (and is our backup solution).**

- -50

- +50 (deg)

- 0

## GEANT Calculation efforts for the background evaluation

**Backgrounds**

**Number of fired cells per event**

- GEANT Calculation efforts for the background evaluation

- Belle Type (12 x 12 cm)
- are installed in PISA.

**by T. Takagi**

## Budget & Issues (summary from June/2002 core week)

- US-J Budget;
- One third of PMT’s and Aerogel will be purchased in JFY02 with US-J fund.
- Items maybe switched to other items if we select Russian pmt’s/Aerogel.
- R&D for Aerogel FEE will be started based on RICH FEE in this year.
- New electronics professional, Dr. Motoi Inaba at Tsukuba team.
- Considering funding situation, most likely, we complete the construction in three years despite our original plan of two years.
- Need collaboration decisions on
- Size of the Aerogel
- The size of the project is determined by the single particle meas. and the US-J budget.  Any other physics motivation for larger acceptance?
- Use of US R&D fund ?

- Budget & Issues (summary from June/2002 core week)

- He is now staying
- at BNL to discuss
- Fee configuration
- for Aerogel counter.