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Ge Test-stands at MPI M unich. Xiang Liu. General Crystals, Test-stands & Results Outlook. Crystals & Test-stands. 2 Canberra crystals (for test-stands II & III) Canberra-I : non-true coaxial, no segment (ready & tested) Canberra-II: coaxial, 18 segments, 6  x 3z 3 DSG crystals

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Ge Test-stands at MPI M unich

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Ge test stands at mpi m unich

Ge Test-stands

at MPI Munich

Xiang Liu

  • General

  • Crystals, Test-stands & Results

  • Outlook


Ge test stands at mpi m unich

Crystals & Test-stands

  • 2 Canberra crystals

  • (for test-stands II & III)

  • Canberra-I : non-true coaxial, no segment (ready & tested)

  • Canberra-II: coaxial, 18 segments,

    6 x 3z

  • 3 DSG crystals

  • (for test-stands I & III)

  • DSG-I : true coaxial, no segment (ready)

  • DSG-II : 6 segments (ready)

  • DSG-III: 18 segments, 6 x 3z

  • 3 test-stands:

  • Eurysis test-stand:

    for Canberra-I & II in LN2

    (ready)

  • MPI test-stand:

    for DSG I II & III in LN2

    (almost ready)

  • Vacuum test-stand:

    for DSG & Canberra crystals

    (September)

Gerda Collab. , Jun 27-29, 2005

Page 2


Ge test stands at mpi m unich

Goal

  • With Eurysis & DSG LN2 Test-stands:

  • handling Ge in LN2

  • Ge Properties (resolution etc. with  source)

  • Segmentations (coincidence cut for )

  • Pulse shapes (true & non-true coaxial)

  • MC verification (energy, pulse shape)

    With Vacuum Test-stand:

  • Dead layer thickness (with laser)

  •  source

Gerda Collab. , Jun 27-29, 2005

Page 3


Ge test stands at mpi m unich

Crystals Canberra-I

Canberra-I: non-true coaxial, no segment, mounted on stick

crystal

preamp

Canberra-II: 6 x 3z

Gerda Collab. , Jun 27-29, 2005

Page 4


Ge test stands at mpi m unich

Crystals Canberra-I

Gerda Collab. , Jun 27-29, 2005

Page 5


Ge test stands at mpi m unich

1st Test-stand: Eurysis Test-stand

  • Made in Eurisys

  • For Canberra crystals only

  • Dewar ~50cm H, ~20cm R

  • Heater at top and bottom (to evaporate LN2)

  • Plug & play

Open for crystal

heater

Safety valve

source

Gas & LN2

Canberra-I

Eurysis

Gerda Collab. , Jun 27-29, 2005

Page 6


Ge test stands at mpi m unich

Eurysis Test-stand operation

Steps:

Fill Dewer with LN2.

Take Canberra-I out from vacuum can.

Dip Canberra-I into LN2.

Apply HV and measure.

Steps after measurement:

Seal dewer gastight.

Pump in gas N2 and LN2 out.

Turn on top & bottom heater.

Turn on heater around crystal for 2 hours.

Take out canberra-I and put back to can and make vacuum.

No condensation on crystal during warmup.

Canberra-I

Eurysis

Gerda Collab. , Jun 27-29, 2005

Page 7


Ge test stands at mpi m unich

Results from Eurysis Test-stand

Jun 7th, 2005, Eurysis Test-stand with Canberra-I crystal.

FWHM ~5keV at 1.173MeV, need more investigation.

Gerda Collab. , Jun 27-29, 2005

Page 8


Ge test stands at mpi m unich

Crystal DSG-I

3 Ge crystals from DSG:

DSG-I : P-type, true-coaxial, no segment.

Gerda Collab. , Jun 27-29, 2005

Page 9


Ge test stands at mpi m unich

Crystals DSG-II & III

DSG-II : P-type, true-coaxial, 6 phi segments

(test at DSG done, now at Munich)

DSG-III: 6phi x 3z

Gerda Collab. , Jun 27-29, 2005

Page 10


Ge test stands at mpi m unich

2nd Test-stand: MPI Test-stand

  • Similar to Eurysis, made in MPI

  • Bigger dewer ~1m H, 30cm R

  • Gallow loading crystals.

  • Only for DSG I, II & III

  • Similar operating procedure.

Cover

Hanging strings

Crystal model

Dewer

Faraday cage

Gerda Collab. , Jun 27-29, 2005

Page 11


Ge test stands at mpi m unich

MPI Test-stand Operation

Critical: no condensation on crystal during warm-up  minimize time to remove LN2 and warm up detector. 

Plan to use little heater.

Expect the first result within 1-2 weeks.

Load crystal

During operation

Gerda Collab. , Jun 27-29, 2005

Page 12


Ge test stands at mpi m unich

MPI vs. Eurysis Teststand

MPI test-stand has many advantages:

  • closer to Gerda design (mini-Gerda), can test support strings & cable in LN2.

  • built in house, easy to modify according to new requirement.

  • Support strings flexible, can hang 2 crystals together and take coincidence data.

  • Test-stand built in house, cost “no” money.

vs.

  • In principle, can dip Canberra crystal into MPI test-stand, & v.v.

  • Same physics tests

Gerda Collab. , Jun 27-29, 2005

Page 13


Ge test stands at mpi m unich

3rd Test-stand: Vacuum Test-stand

Vacuum tanks

Gerda Collab. , Jun 27-29, 2005

Page 14


Ge test stands at mpi m unich

Vacuum Test-stand

  • 3 stations mounted together

  • Sources move in 3D around crystal

  • Crystal fixed & cooled through LN2 pipes

  • For both Canberra & DSG crystals

  • ,  sources & laser can be used

  • Expect first run September

Gerda Collab. , Jun 27-29, 2005

Page 15


Ge test stands at mpi m unich

DAQ

XIA Pixie-4.

On board PC.

Each card reads 4 channels.

14bit ADC, 75MHz spc.

for pulse shape.

NIM cards for HV and

preamp. power supply

PC

Pixie card

Gerda Collab. , Jun 27-29, 2005

Page 16


Ge test stands at mpi m unich

Outlook

Eurisys Test-stand:

More study with Canberra-I, solve resolution problem.

Canberra-II detector end of this year

MPI Test-stand:

DSG-I 1-2 week. True coaxial, good for pulse shapes.

DSG-II crystal ready, 1-2 week, study segments and more pulse shapes.

DSG-III arrive end of this year

Vacuum Test-stand:

Start data taking September

Study dead layer with laser, hadronic interaction with sources.

Gerda Collab. , Jun 27-29, 2005

Page 17


Ge test stands at mpi m unich

Conclusion

  • Many test stand setups:

  • Different crystals, non-true, true-coaxial, none,

    6 & 18 segments.

  • Different environment, LN2, Vacuum.

  • Different sources, ,  & laser

  • Rich physics will be explored:

  • Ge general properties.

  • EM & hadron interactions.

  • Pulse shape.

  • All with MC simulations.

  • Any suggestions, ideas about measurement, simulation, please contact us!

Gerda Collab. , Jun 27-29, 2005

Page 18


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