Hera technical improvement program m bieler desy 5 11 2005
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Replacement of aging Components Performance Improvements Reliability Enhancements. HERA Technical Improvement Program M. Bieler, DESY, 5.11.2005. The BU Coil Exchange Program. p-Ring. Coils are made from hollow copper bars. At the rectangular joints turbulent water flow creates leaks.

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HERA Technical Improvement Program M. Bieler, DESY, 5.11.2005

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Hera technical improvement program m bieler desy 5 11 2005

Replacement of aging Components

Performance Improvements

Reliability Enhancements

HERA Technical Improvement Program M. Bieler, DESY, 5.11.2005

M. Bieler, DESY, -MBB-


The bu coil exchange program

The BU Coil Exchange Program

p-Ring

Coils are made from hollow copper bars. At the rectangular joints turbulent water flow creates leaks.

BU dipole

magnet

e-Ring

M. Bieler, DESY, -MBB-


Hera technical improvement program m bieler desy 5 11 2005

The BU Coil Exchange Program

Old BU Coils

M. Bieler, DESY, -MBB-


The bu coil exchange program1

The BU Coil Exchange Program

BU Magnet

(21 tons)

RF Cavity

RF Waveguides

M. Bieler, DESY, -MBB-


The bu coil exchange program2

The BU Coil Exchange Program

3 BU magnets,

6 new coils (Oct. 03),

no old coils

N

3 BU magnets,

1 new coil (July 03),

5 old coils

3 BU magnets,

6 old coils

E

W

HERA

3 BU magnets,

6 old coils

All old coils will be replaced

in the next winter shutdown

3 BU magnets,

2 new coil (April 05),

4 old coils

3 BU magnets,

6 old coils

S

M. Bieler, DESY, -MBB-


Electron rf system improvements

Electron RF System Improvements

Problem:

Crowbar system

for rf klystrons

misfires often.

Solution:

More current

transformers,

signals combined

in a new crowbar

ignition logic.

Successfully tested in 1 of 8 rf stations.

Installation in all stations in the shutdown.

M. Bieler, DESY, -MBB-


Longitudinal multi bunch damper system for protons

Longitudinal Multi Bunch Damper System for Protons

Problem: Proton bunch length increases on the ramp,

driven by longitudinal multi bunch instabilities.

Longer bunches decrease the luminosity

(hour glass effect).

Analysis: Different modes

drive the instabilities.

Solution: Broadband damper

system.

M. Bieler, DESY, -MBB-


Longitudinal multi bunch damper system for protons1

Longitudinal Multi Bunch Damper System for Protons

Cavity, transmitter and electronics

ready for installation in the shutdown.

M. Bieler, DESY, -MBB-


Vacuum system improvements

Vacuum System Improvements

HERA e Spin Rotator

Due to the vertical bends

in the spin rotator some vacuum

chambers see high synchrotron

radiation loads.

The bellows between the vacuum

chambers are protected against

direct radiation by absorbers, but

go through thermal cycles with the

beam current.

M. Bieler, DESY, -MBB-


Vacuum system improvements1

Vacuum System Improvements

Typical leak of a rotator bellow:

End of a luminosity run, dump of 5mA electrons,

2 minutes later the vacuum pressure increases.

M. Bieler, DESY, -MBB-


Vacuum system improvements2

Vacuum System Improvements

Vacuum weld

(breaks under

thermal stress)

Support weld

(often missing)

Solution:

Open vacuum weld, add support weld,

redo vacuum weld.

To be done on all 24 bellows in the

winter shutdown.

M. Bieler, DESY, -MBB-


Vacuum system improvements3

Vacuum System Improvements

Increased Pumping power in RF section:

A number of new vacuum pumps with higher pump speed

have been purchased and will be installed in the cavity

section HERA SR. Here the vacuum has to be vented

anyway to replace two input couplers.

The stronger pumps will help to minimize the time needed

for rf conditioning of this section.

M. Bieler, DESY, -MBB-


Permit server

Permit Server

Every now and then someone tries to accumulate protons…

Therefore we need a rather intelligent system to prevent

us from (for example) injecting protons into an already

occupied bucket.

Such a system was planned for a long time, but only now

procedures are stable enough to control them.

Phase 1 of the new Permit Server checks all necessary

conditions for proton and electron transfer from PETRA

to HERA.

M. Bieler, DESY, -MBB-


Permit server1

Permit Server

If any of the given

conditions is not fulfilled,

the transfer is blocked.

This can be overruled

by the operator.

The Permit Server will be upgraded to cover the whole HERA procedure.

M. Bieler, DESY, -MBB-


P tune controller

p Tune Controller

  • A new proton tune controller is operational for most of the ramp.

  • Problems are

  • Coupling

  • Chromaticity

  • Peak detection

A different version for luminosity

operation is under test.

Peak detection by wavelets is more reliable.

M. Bieler, DESY, -MBB-


Automated timing system

Automated Timing System

The following features of the HERA Timing Systemhave been automated:

- Electron timing: Bunch position relative to a marker.

- Proton timing: Bunch position relative to a marker.

- E/P timing: E and p frequencies locked and bunches

colliding at the IP.

All this had to be checked and corrected by the operators and is now handled automatically in the background.

M. Bieler, DESY, -MBB-


Hera technical improvement program m bieler desy 5 11 2005

BPMs

p-BPMs:

The old p-BPM system is getting more and more unreliable. New

BPM electronics will be installed at the 12 most critical BPMs in the

straight sections north, east and south.

e-BPMs:

New BPM electronics is installed at all monitors since 2004.

New software features like post mortem analysis are in preparation

since then.

e Orbit Stabilizer:

The new e-BPM electronics allowed the introduction of a global

orbit stabilization system. This system has been improved ever

since and is vital for stable luminosity operation.

M. Bieler, DESY, -MBB-


Fast electron orbit feedback

Fast Electron Orbit Feedback

FFT of fast orbit motion,

measured with one BPM.

Peaks at 50Hz and low

frequencies, amplitudes

40 to 100µm.

Feedback:

8 corrector coils will be used for closed orbit bumps in both IPs in

both planes. Up to frequencies of 20Hz a reduction of the orbit

motion should be possible.

First tests foreseen for November 2005.

M. Bieler, DESY, -MBB-


Machine protection system

Machine Protection System

Fast Beam Current Measurement:

A fast beam current measurement has been implemented. Sudden drops in beam current are detected and lead to a beam dump

before the rest of the beam is lost.

Fast Magnet Current Measurement:

A fast current measurement has been implemented in some critical

power supplies. Sudden drops of the power supply voltage are

detected and lead to a beam dump before the beam reacts on the

change in the magnetic field.

These systems are faster than the beam loss monitors and have helped to prevent contamination due to fast proton losses.

M. Bieler, DESY, -MBB-


Synchrotron light monitors

Synchrotron Light Monitors

e Synchrotron Light:

The Synchrotron Light Monitor for

electrons has been improved and allows

continuous emittance measurements now.

p Synchrotron Light:

A Synchrotron Light Monitor for protons

at 920GeV has been developed and

installed at a vertically bending BU

magnet. It allows continuous emittance

measurements

M. Bieler, DESY, -MBB-


Other diagnostics

Other Diagnostics

Lifetime Measurement:

A new algorithm for a fast lifetime

measurement was implemented.

It gives faster response to sudden

changes in the beam conditions.

M. Bieler, DESY, -MBB-


Other diagnostics1

Other Diagnostics

Temperature Measurement:

After a stainless steel vacuum chamber had been destroyed by

synchrotron radiation, a new kind of very thin temperature sensors

has been put between the chamber and the surrounding quadrupole

magnet. The sensors are connected to the electron beam dump.

M. Bieler, DESY, -MBB-


Summary

Summary

A rich program of 1.5 M€ and 10 PY

is under way to improve HERA’s

performance and keep the machine

reliable until the very last day of operation.

Acknowledgement:

This talk covers the work of many people from MEA, ZBAU, MIN, MSK, MDI,

MST, MPY, MHE, MHF, MVA,…

M. Bieler, DESY, -MBB-


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