slide1
Download
Skip this Video
Download Presentation
Ge Test-stands at MPI M unich

Loading in 2 Seconds...

play fullscreen
1 / 18

Ge Test-stands at MPI M unich - PowerPoint PPT Presentation


  • 77 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Ge Test-stands at MPI M unich' - becca


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Ge Test-stands

at MPI Munich

Xiang Liu

  • General
  • Crystals, Test-stands & Results
  • Outlook
slide2

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

slide3

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

slide4

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

slide5

Crystals Canberra-I

Gerda Collab. , Jun 27-29, 2005

Page 5

slide6

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

slide7

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

slide8

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

slide9

Crystal DSG-I

3 Ge crystals from DSG:

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

Gerda Collab. , Jun 27-29, 2005

Page 9

slide10

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

slide11

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

slide12

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

slide13

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

slide14

3rd Test-stand: Vacuum Test-stand

Vacuum tanks

Gerda Collab. , Jun 27-29, 2005

Page 14

slide15

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

slide16

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

slide17

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

slide18

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

ad