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A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at...

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A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab . Why . How . Main Characteristics/Expected performances. . Tests . CERN . Cosmics . Beam . Conclusions and outlook IMAGING 2003 – Stockholm – 24 th – 27 th June 2003 F. Cusanno – Hall A RICH collaboration
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Page 1: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Labin Hall A at Jefferson Lab

. Why

. How

. Main Characteristics/Expected performances.

. Tests. CERN. Cosmics. Beam

. Conclusions and outlook

IMAGING 2003 – Stockholm – 24th – 27th June 2003

F. Cusanno – Hall A RICH collaboration

Page 2: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

-N Interaction-N Interaction

VN = V( r ) + V( r ) S.SN + V(r ) SN.lN + VT( r) S12

Very important for astrophysics (neutron star formation)

E-94-107 - F. Garibaldi, S. Frullani, J. LeRose, P. Markowitz, T. Saito

Page 3: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

Process Rate

signal (e,e’K) 10-4 – 10-2

accidentals

(e,e’)(e,pi)(e,e’)(e,p)(e,e’)(e,k)

1001000.1

• RICH Project started Summer 98• Test CERN November 00

Page 4: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.
Page 5: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

= msr

p/p = 5%

p/p =1 x 10-4

Page 6: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

Cos =1/n / = tg With N p.e. per ring

/N

- n fixed by the momentum(2GeV/c) C6F14, transparent down to 160 nm

- compact (~ 50 cm)- 310 x 1820 mm2- relatively thin (18% X0)- quarz window 5 mm

15 mm300 nm

Page 7: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.
Page 8: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

MCarlo

Page 9: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

radiator

• NEOCERAM• Quartz cylinders, 5mm quartz window

Page 10: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

50*

50*

50*

100*

100*

100*

VMEtransferttime (μ )s

.kHz180101202000 /48kHzADC

2.8kHz36010300800 /48kHzADC

3.3kHz30210192200 /24kHzADC

16

30

710

(Sum μ )s

2.9kHz102402000 /24kHzADC

6.4kHz1096200 /48kHzADC

1.4kHz10600800 /24kHzADC

Maximum,100%rate

dead time

Trigger andend overheadtime

(μ )s

Digitization(time μ )s

Clock/#frequency

of ADC

*100 / ,pad event is assumed 1μσ/dataword + 50 μs /event; at this low occupancy a block movementdoes not decrease the time (pedestal)

The network datatransfert will go in parallel mode via 100 Mbit FastEthernet

6.4

6.4KHz

Page 11: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.
Page 12: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.
Page 13: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

Freon System

Page 14: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

The fluid is degassed by bubbling high purity nitrogen through a bed of 2 micron pore, sintered stainless steel cylinders and then through the liquid to scavenge air in solution in the fluid. The sintered stainless cylinders maximize the contact area between the nitrogen and the radiator liquid. This significantly speeds the degassing of the radiator liquid. The nitrogen then passes through a cold condenser that removes the perfluorohexane from the air/nitrogen/perfluorhexane stream and returns the perfluorhexane to the tank. The fluid also passes over an alternating pair of molecular sieve filters before being pumped to the radiator.

 

Several methods are used to verify the quality of the radiator fluid. The effluent from the degassing tank passes through an oxygen and moisture sensor. An on-line transmission monitor measures the transmission of the liquid in the return flow from the radiator. Periodically the return flow is temporally diverted through an optical sample cell. The light from a mercury vapor light, filtered to select the appropriate wavelength (184 nanometers) is passed through a beam splitter. One light beam goes through the sample cell and its intensity measured with photodiode. The other light beam goes directly to another photodiode and is used as a reference. The ratio of outputs from the two photodiodes is an approximate measure of radiator liquid transmission at the selected wavelength.

Page 15: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

Bandpassfilter

Page 16: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

gas system

Page 17: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

CERN tests Nov ‘00

Page 18: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.
Page 19: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

CERN tests 11/00

7 GeV/C beam

Argon CH4 (25/75)

2 photocathodes (Rome and CERN)

Equal performances

N = ~ 12

Page 20: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

Jlab Cosmic tests Aug 01 2100 V

Page 21: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

On beam tests

March 02

Page 22: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

2150 V 2250 V

G~ 5 x 104

G~ 1 x 105

Page 23: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.
Page 24: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

MPWC Gain Comparison

STARPRESENT STATUSOLD STATUS

HV (V) ALICE OUR RICH

1900 2.8 2.6

2000 4.7 4.4

2100 6.8 6.3

MIP signal size (# of pads)

‘Good working’ range

Page 25: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

Jlab Cosmic tests June 03

Scan in positioning: presently we are on the left side, 160 mm distance from boundary (and >0). Extrapolating to =0 in with the whole ring in the active area: ~ 10-11 p.e. (as at CERN)

2150 V

G~ 2.5 x 105

A0=26

Page 26: A RICH Detector for strangeness physics A RICH Detector for strangeness physics in Hall A at Jefferson Lab in Hall A at Jefferson Lab. Why. How. Main Characteristics/Expected.

ConclusionsConclusions• The present Hall A PID setup is not sufficient for unambiguous K identification needed for hypernuclear spectroscopy

• A Proximity focusing C6F14/CsI RICH detector has been built and tested

• Performances in the expectations - gain problem understood and fixed

CsI evaporation technique unders control

Detector ready to be installed for the Hypernuclear experiment


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