The Synchrotron (DESY-II)John Maidment MDE

MAC Review Meeting

May 2008

DESY

• Decouple Desy3 Vacuum System

• New Beamline Vacuum Chambers

• Replace Kicker Pulsers, Relocate Controls

• Connect New Cooling Water Facility

• Install/Test New Power Supplies and Regulation

Shutdown Activities

Tunnel overview

Desy 2

Desy 3

In and Ejection

To Petra

FromPia

Test beam region

Photons FromInternal Target

Converters

Spectrometer

In and Ejection May 08

To Petra(E-Weg)

BPM in ejection line

Test beam region May 08

Test beam outlet to Hall 2 May 08

ShutterCollimator

• Replace Kicker Pulsers, Relocate Controls

• Connect New Cooling Water Facility

• Install/Test New Power Supplies and Regulation

Shutdown Activities

Kicker Locations

Nebenbunch-kicker

Ki 20

R1

R2

R3

R4

R5

R6

R7

R8

SER

Injektionskicker

Ki 2+ Ki 2-

Dumpkicker

Ki 16

Vertikaler Anregungs-kicker

Ki 12V

Ejektionskicker DORIS

Ki 24R

Horizontaler Anregungs-kicker

Ki 36H

Ejektionskicker PETRA

Ki 40E

e+

e-

e- / e+PIA / Linac II

PETRA III

DORIS

G1 G2 G

3 G4 G

5 G6 G

7 G8

G9

Injektionsspetum

SEPT +/-

Ejektionsseptum PETRA

Sept 42E

Ejektionssepta DORIS

Sept 26AR Sept 26BR

VBB 46 E/R

VBB 44

E/R

HBB R

HBB R HBB R

HBB R

HBB E

HBB E

HB

B E

Typical pulser unit May 08

• Six units (for the 5 circuits) have been ordered plus 2 general purpose spares

• Dipole retains white circuit• New chokes for quad resonance circuits have been ordered

• Manufacturing schedule has slipped, so:• One unit (sextupole) is here and has been connected• Tunnel has been closed to allow technical tests (albeit at low load

current)

• Three regulation loops, current, voltage, field• Biased cosine set point tables for both I and V• How will the DSP management perform, questions of synchronous

data acquisition etc

New Power Supplies

• Desy-II is just a work horse, can accelerate a single bunch with up to 1.3*1010 particles

• Programmable hardware exists ( “Zyklusgenerator”, LTG) • Top-up to Petra has been demonstrated• Injection to Doris using a 6GeV magnet cycle has been

demonstrated

• The existing linac gun allowed positron accumulation of 50 mA in 48 Petra-II bunches in < 3 minutes at 3 Hz

• Doris was refilled using 3*109 positrons per bunch at 6 Hz in under 1 minute

Future Operation in “Top-up” Mode