# Presentation: 499937

## Plastic BallMounting and Electronics

**Plastic Ball****Mounting and Electronics**

- Setup at the KVI cyclotron
- Configuration of Plastic Ball
- Experiments and particle separation
- Electronics
- Requirements and work to be done

***H. L******ö******hner, J. Messchendorp (KVI)******K. Peters (GSI)***

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Plastic Ball for bremsstrahlung and charged particles

- backward hemisphere
- (340 detectors)
- in front of charged particle array

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Setup at magnetic spectrometer

**target:**
**liquid He or**
**solid ****6****Li**

**3****He, ****4****He **
**87, 58 A MeV**

**PlasticBall:**
**detection of ******** and ********0**

**BBS with ****Heavy Ion array:**
**detection of fusion product**

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Both hemispheres together

**HV block connectors (16 ch)**
**For LRC1440**

**50******** splitter boxes:**
**1) Army connectors (8 ch)**
**     ****to delay (560 ns) to QDC**
**	****	****2) BNC to trigger / TDC**

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Mercator projectionof spherical arrangement of triangles

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Experimental setup:Plastic Ball + SALAD

**inner radius: 254 mm**

## Plastic Ball

**552 phoswich detector modules**
**coverage: 50****0**** to 160****0**
**77% of 4******** solid angle**

**340**

**212**

- 23 detectors
- removed for
- L-target

**552 detectors**

## CsI Inner Shell of Plastic Ball

**complete detector (70 elements) usd in last experiment,**
**efficient converter (2.5 X****0****) for photons.**
**Simulated resolution for pion mass: 15 MeV**

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Proton ID and cross sections

- (p,xp) cross sections for
- accelerator-driven systems

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Plastic Ball photon/electronseparation

- projection along 45o line   PID spectrum E –(E+dE) =-E

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Original scheme for pulse-shapemeasurement and + identification

- long-range TDC’s
- measure + decay curve
- (2.2 s mean life time)

**4-fold split**

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Timing signal

- slow,
- high deadtime:
- measure
- long decay times

- fast,
- low deadtime:
- provide
- fast trigger

- original

- KVI modification

**100 ns**

**15 ********s**

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Plastic Ball data acquisition

**introduced 2-times 2-fold split: allows trigger derivation **
**	****	****	****	****	****	****   ****from Plastic Ball**

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006

## Plastic Ball in MIPP

**Goal:** recoil fragments in p and p-bar reactions on H and A-targets
**Requirements:**
- original electronics configuration for p, d, t, ... +, n detection
- 	with external trigger
- backwards hemisphere only (320 modules)
- QDC electronics other than present LRC2280 QDC’s (too slow!)
**To be done:**
- repair/improve ca. 20 modules, replace PM and/of repair bases
- inspect Ball Boxes, improve trigger thresholds, repair bad channels
- adjust frame height for MIPP setup; drawings and construction
- checkup of LRC1440 HV system, repair controllers, cards
- cable connections for Fermilab QDC’s
- inspect and repair ca. 20 TDC channels
- transport box with shock-resistant frame, transport

- H. Löhner - Plastic Ball Mounting and Electronics

- December 2006