may 4th 2006r.mirzoyan: cta meeting, berlin the magic project: performance of the 1st telescope...

May 4th 2006 R.Mirzoyan: CTA meeting, Berlin

The MAGIC Project:Performance of the 1st telescope

Razmick MirzoyanOn behalf of the MAGIC Collaboration

Max-Planck-Institute for PhysicsMunich, Germany


MAGIC-I at ORM in La Palma First presentations in 1995, for example, 24th ICRC, Rome, (Bradbury et al.) Design study: spring 1998 Approval of funding late 2000 Start of construction 2001 Inauguration October 2003 Comissioning late summer 2004Regular observations: early fall 2004


Imaging Camera

• Field of View: 3.50 6 dynode PMTs (low gain) from Electron Tubes, England

central 0.1° PMTs: 397 edge 0.2° PMTs: 180

Quantum Efficiency is Quantum Efficiency is up toup to 30 %30 % by using by using milkymilky diffuse diffuse scattering coatingscattering coating

enhanced UV enhanced UV sensitivity usingsensitivity using wavelength shifterwavelength shifter coatingcoating

240 m2 -> 312 m2 !!!

Temperature stabilisation Temperature stabilisation by cooled-down water flow by cooled-down water flow through the skin of camerathrough the skin of camera


Trigger architecture

L0 =>L0 => Computer controlled discriminators

+ Single pixel rate online monitor

L1 =>L1 => fast coincidence simple topology trigger fast coincidence simple topology trigger

(2-3-4-5 NN logic) 4-6ns gate (2-3-4-5 NN logic) 4-6ns gate

L2 =>L2 => digital pattern selection made with tree structured lookup table system (20ns gate)

pixel counitng in compact regions

hot pixels mask

higer topological constraint ….

Prescaler => Prescaler => Final combination of different trigger tables with a prescale factor

TWO FOLD KINDS (86) THREE FOLD KINDS (51)

FOUR FOLD KINDS (67) FIVE FOLD KINDS (106)


Rates

• During observations the trigger rate is about 250-300 Hz.

• Standard trigger condition is „any ≥ 4NN pixels above a threshold of ~ 8-10 ph.e.“

• Depending on the analyses cuts the rate from Crab Nebula is about 8-10 events in one minute.

• An up-time of 90-95 % for observations has been achieved in good weather months.


Active Mirror Control Light-weight structure requires zenith angle dependent corrections of deformations of the reflector shape

achieved PSF:90% of light contained in 0.1° size inner pixel

Tracking of Jupiter

With AMC

Without AMC


Angular Resolution• DISP method

DISP (Size,Za) (1width

length) 1

• angular resolution: 0.1o


Energy resolution

• Image SIZE ph.e. together with several other parameters is used for energy estimation

• optimized estimator using Random Forest technique

• 20% (30%) @ 1 TeV (100 GeV)


Sensitivity

• Trigger threshold ~ 50GeV– Sensitivity: 2.5% Crab for – E > 100GeV (5,

50h)– or 22 h

• ~ 15 galactic and extragalactic sources are detected or discovered (see the talk by Masahiro), interesting publications already appeared/are queing

MAGIC-I

11hh ON ONZ.A.: 15°-25°Z.A.: 15°-25°Size > 360 ph.e.Size > 360 ph.e.(E > 200 GeV)(E > 200 GeV)cutcut < 6° < 6°Excess ev.: 648Significance: Significance: 4141

MknMkn July 1 July 1stst 2005 2005


MAGIC-IMAGIC-I

MAGIC-IIMAGIC-II

The 2nd improved telescope is being build– to double the sensitivity and – to help to lower the energy threshold further down

MAGIC - IIMAGIC - II


Conclusions

• Since ~ 1.5 years we are observing with MAGIC-I. We have achieved smooth operational condition.

• ~15 sources (new and known) have been detected, publications are queing.

• For the time being we can analyse sorces down to ~ 80 GeV, we are working to lower the threshold further down.

• New technologies, used in MAGIC-I, performe satisfactory. In the past we needed to improve the AMC system, especially by making the electronics water-tight.

• MAGIC-II will include improvements that we learnt from MAGIC-I.

• In 2007 we are going to opearte 2 telescopes in coincidence; that‘s going to double the sensitivity.

may 4th 2006r.mirzoyan: cta meeting, berlin the magic project: performance of the 1st telescope...

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