26.Aug.2008 Jin Sook KIM Slide 1

Activities in ALICE TOF

Kangnung Univ.

Ph D. Student

Jin Sook KIM

26.Aug.2008 Jin Sook KIM Slide 2

Contents

1. Multigap Resistive Plate Chamber R & D (04.2004 ~ 03.2007) (1) 10 gaps MRPC (2) 24 gaps MRPC (3) 6 gaps MRPC

2. Time-Of-Flight Detector Assembly (04.2007 ~ 04.2008) (1) TOF detector (2) TOF detector assembly

3. Task (05.2008 ~ ) (1) TOF Commissioning (2) ALICE - KOREA FUND Account (3) Research Guide (4) Finish - PH D. Thesis

26.Aug.2008 Jin Sook KIM Slide 3

1. MRPC R&D (04.2004 ~ 03.2007)

(1) 10 gaps MRPC (TOF detector system)• Consist : 5 gas gaps of 2 stacks • Gap size : 250 m• Active area : 7 cm 120 cm

(with 96 pads)• Pad size : 2.5 cm 3.5 cm• Time resolution : ~ 50 ps• Efficiency : ~ 99 %• Article : Aging and rate effects of

the Multigap RPC studied

at the Gamma Irradiation

Facility at CERN. Etc..(5 more)

Cross-section of the MRPC strip with 10 gas gaps

26.Aug.2008 Jin Sook KIM Slide 4

1. MRPC R&D (04.2004 ~ 03.2007)

(2) 24 gaps MRPC• Consist : 6 gas gaps of 4 stacks • Gap size : 160 m• Active area : 7 cm 61 cm (with 24 pads )• Pad size : 2.5 cm 7 cm• Time resolution : ~ 20 ps• Efficiency : ~ 99 % • Article : A 20 ps timing device - a multigap resistive plate chamber with 24 gas gaps

Schematic cross-section of 24 gaps MRPC

26.Aug.2008 Jin Sook KIM Slide 5

1. MRPC R&D (04.2004 ~ 03.2007)

(3) 6 gaps MRPC (Extreme Energy Events Project)• Goal(EEE Project) : build by high school students and operate at their school in Italy (using cosmic ray) • Consist : 6 gas gaps of 1 stack • Gap size : 300 m• Active area : 82 cm 158 cm (with 24 pads)• Pad size : 2.5 cm 180 cm• Time resolution : ~ 67 ps • Position resolution : ~ 0.84 cm• Article : Performance of a six gap MRPC built for large area coverage. Etc...(3 more) EEE Project poster

26.Aug.2008 Jin Sook KIM Slide 6

1. MRPC R&D (04.2004 ~ 03.2007)

Schematic cross-section of the 6 gaps MRPC

Schematic representation of aluminum box

26.Aug.2008 Jin Sook KIM Slide 7

21 schools (2 years)

26.Aug.2008 Jin Sook KIM Slide 8

2. TOF Detector Assembly (04.2007~04.2008)

(1) Time-Of-Flight (TOF) Detector • Momentum range : 0.5 GeV/c ~ 2.5 GeV/c• Polar angles : 45< <135 (full coverage in )• Cover area : 160 m2 • Inner radius : 3.7 m (from the beam)• Length of the cylinder : 7.2 m • TOF Array : 18 SuperModules• 1 SuperModule : 5 modules• 90 Modules contain : 1638 MRPCs with

157248 readout channels

The TOF detector in the Space Frame

26.Aug.2008 Jin Sook KIM Slide 9

2. TOF Detector Assembly (04.2007~04.2008)

(2) Time-Of-Flight Detector Assembly• Cable test : Pulse cable, LV cable, HV cable, Amphenol signal cable….

• Magnetic sensible Screw change : FEE card, TRM, Amphenol cable

• Participated in 15 SuperModules assembly (all 18 SM)

• Installation in SM : FEA Card, Mylar, LV cable, HV cable, Amphenol cable, TRM, LTM, DRM, Cooling bar, DC/DC converter ….

26.Aug.2008 Jin Sook KIM Slide 10

2. TOF Detector Assembly (04.2007~04.2008)

Construction of SuperModules Installation of Amphenol signal cables

26.Aug.2008 Jin Sook KIM Slide 11

3. Task (05.2008 ~ )

(1) TOF Commissioning • Maintaining and Shift

(2) ALICE - KOREA FUND Account• Kangnung Univ. Kunkuk Univ. Pusan Univ.

Sejong Univ. Yonsei Univ.

(3) Research Guide• Student JeeWon SEO (Kunkuk Univ.)

(4) Finish - PH D. Thesis