diamond activities desy zeuthen
DESCRIPTION
DIAMOND ACTIVITIES DESY Zeuthen. Wolfgang Lange. MOTIVATION and PEOPLE:. Calorimetry in an environment with high radiation doses (TESLA beam cal) Beam diagnostics (photoinjector test facility Zeuthen) ------ Currently 2 physicists (part of their time) 1 PhD student (2 soon?) - PowerPoint PPT PresentationTRANSCRIPT
DIAMOND ACTIVITIESDESY Zeuthen
Wolfgang Lange
MOTIVATION and PEOPLE:• Calorimetry in an environment with high radiation
doses (TESLA beam cal)
• Beam diagnostics (photoinjector test facility Zeuthen)
• ------
• Currently 2 physicists (part of their time)
1 PhD student (2 soon?)
1 Postdoc (applications now checked)
• Support from ‘applying’ groups like Photoinjector…
• Small group, few people: search for potential collaborators under the headline: Who does apply or produce diamonds?• DESY HH, GSI Darmstadt, IAP Freiburg• GPI Moscow, JINR Dubna• CERN / existing collaborations?• Diamond material from E6
• Decision: learning by doing…
How did we start?
• Prototyping of sensors from different manufacturers: IAP, GPI, E6
– IAP: polycrystalline samples with different finishing and treatment
– GPI: polycrystalline samples– 2 samples bought from E6
--> INVESTIGATION OF PROPERTIES
Our Program
MEASUREMENTS:DC measurements: we found ohmic behavior, hysteresis effects, nonohmic (nonlinear) effects, search for correlation with othersensor properties…
MORE ON MEASUREMENTS:
Dia
mo
nd
Ke
ith
ley
48
7HV
N2
- Extremely low currents:-> dry N2 atmosphere and well isolating materials- settling times, relaxation
SIGNALS:
&
Gate
PA
discr
discr
delay
ADCSr90
PM1
PM2
diamond
Scint.
Lab in Zeuthen
-> more data required-> test run
TEST BEAM (low rate) :
MIP in a 5 GeV/cTest beam (T7)
TEST BEAM (high intensity) :
Sensor with negative bias5 GeV/c test beam (T7)
Sensor with positive bias5 GeV/c test beam (T7)
TEST BEAM (structured sensor) :Sensor (1 cm2)with structure:4 (2*2) pads5 GeV/c (T7)
2 pads parallel(yellow)2 individual
Scintillator forCalibration (green)
PLANS AND FUTURE• Improved sensors (CCD), use of different
analysis methods -> search for correlation with sensor properties
• Better understanding of observed effects
• Try to instrument larger areas (cal)
• R&D of readout technologies
• Prototyping of a calorimeter segment and of beam diagnostic sensors