accelerator physics and integrated detectors

Accelerator Physics and Integrated

Detectors

Status Report

Kurt Aulenbacher, Winfried Barth

Session of the HIM Scientific Council

2015, April 21

Accelerator Physics and Integrated

OUTLINE

• THE INFRASTRUCTURE, THE PROJECTS

AND THE TEAMS

• SHE-LINAC PROJECT

• HESR-COOLER PROJECT

Accelerator Physics and Integrated Detectors

Infrastructure, SHE-LINAC, HESR-research & more

ACID-HESR (Cooler):

Head: Kurt Aulenbacher

Staff: Andre Hofmann (Post-Doc)

Mirko Schwartz (Technician)

Jürgen Dietrich (consultant)

Students: T. Weilbach (PhD ~ 2014)

M. Bruker (PhD ~ 2015)

J. Friedrich (Ma-Sc 2013)

(Ba-Sc 2011 )

T. Stengler (Ma 2014)

(Ba 2012)

Acid Section Head:

JGU Prof W3 Kurt Aulenbacher

Co-Section Head

GSI Section leader Winfried Barth

ACID-SHE Linac:

Head: Winfried Barth

Staff: V. Gettmann (Eng)

S. Jacke (Post-Doc)(open

position)

Students: M. Amberg (PhD ~ 2014)

U.Ratzinger GUF

H. Podlech GUF

D. Bänsch GUF

F. Dziuba GUF

S. Mickat

project coordinatorGSI

W. Barth GSI

W. Vinzenz GSI

H. Mueller GSI

C. Schroeder GSI

Objective 2018:

Solve open issues for

8MV HESR cooler

Objective 2018:

From demonstrator to working

multi cavity system

Lq. He transfer

(from KpH) g He transfer

(to KpH)

KÜHLER-

MAGNET-LAB

(HESR-cooler

&more

BUNKER-LAB

SHE-LINAC

(SRF)

Common-infrastructure:

REINRAUM


Infrastructure, SHE-LINAC, HESR-research&more

ACID-HESR (Cooler):

Head: Kurt Aulenbacher

Staff: Andre Hofmann (Post-Doc)

Mirko Schwartz (Technician)

Jürgen Dietrich (consultant)

Students: T. Weilbach (PhD ~ 2014)

M. Bruker (PhD ~ 2015)

J. Friedrich (Ma-Sc 2013)

(Ba-Sc 2011 )

T. Stengler (Ma 2014)

(Ba 2012)

Acid Section Head:


Co-Section Head


ACID-SHE Linac:

Head: Winfried Barth

Staff: V. Gettmann (Eng)

S. Jacke (Post-Doc)(open

position)

Students: M. Amberg (PhD ~ 2014)

U.Ratzinger GUF

H. Podlech GUF

D. Bänsch GUF

F. Dziuba GUF

S. Mickat

project coordinatorGSI

W. Barth GSI

W. Vinzenz GSI

H. Mueller GSI

C. Schroeder GSI

Objective 2018:


8MV HESR cooler

Objective 2018:


multi cavity system

Lq. He transfer

(from KpH) g He transfer

(to KpH)

BUNKER-LAB Main topic: SHE-LINAC

Leader: W. Barth

Post-Docs/Scientists:

S. Mickat

M. Busch (7/2015)

PhD:

M. Amberg

Engineers/Technicians

V. Gettmann

Collaborators:

Group of H. Podlech

U-Frankfurt

COOLER/MAGNET-LAB Main topic: HESR-COOLER

Leader: K. Aulenbacher

Post-Docs/Scientists:

A. Hoffmann

P. Bartholome (5/2015)

PhD:

M. Bruker

T. Weilbach

Engineers/Technicians

M. Schwartz

Collaborators:

V. Kamerzhev, FZJ

(+HESR-group)

nc-CH-cavity

sc-prototype, 360 MHz

sc-325 MHz

UNILAC-booster cavity

rt-325 MHz Alvarez

HSI 36 MHz@gsi

HLI 108 MHz@gsi

IH 216 MHz@HIT/Heidelberg

Wideröe


Infrastructure, SHE-LINAC, HESR-research

Infrastucture for she: present & future

• LHe volume 750 l

• Magnetic field shielding

• 4 K and 2 K operation

• high pressure rinsing

• rf testing (warm & cold cavities)

• cleanroom environment

• optional: setup for BCP

IAP @ Uni Frankfurt Planned infrastructure @ HIM

High charge

state

injector@GSI

GSI-

UNILACcw-LINAC

Beam Intensity (particles/sec)

(S. Hofmann et al, EXON 2004)3 *1012 6 *1013

Beam on target 10 weeks 4 days

GSI-

UNILACcw-LINAC

Beam Intensity (particles/sec)

(S. Hofmann et al, EXON 2004)3 *1012 6 *1013

Beam on target 10 weeks 4 days

GSI/HIM-SHE-progr.

Superconducting cw-linac layout

Super Heavy community High duty factor, 7.5 MeV/u, variable beam energy, heavy ion linac

Superconducting CW-LINAC Layout

HLI

injector@GSI

• Multigap CH-cavities

• Small number of rf cavities and short cavity lengths (up to 1m)

• acc. gradient of 5 MV/m compact linac design

• Several cavities, solenoids per cryostat

• Small transverse cavity dimension

Step 0

Step 1

Step 2

demonstrator (1 cavity)

demonstrator (2 cavities)

advanced demonstrator (5 cavities)

2016 2019 2015

Step 0: CW-LINAC Demonstrator @ GSI

High Charge State Injector (existing)

Beam line (ready)

delivery

@summer 2015

LHe infrastructure

(partially ready)

sc solenoids (9.3 T)

CH cavity

cryostat

delivery

@summer 2015

Step 1&2: Advanced Demonstrator @ GSI

Step 1

(2016)

Step 2

(2019)

• Test of combination of two cavities

• Advanced demonstrator allows first experiment at coulomb barrier

Quality Factor Q vs Ea

for CH-Prototype@325MHz

• Ea =14 MV/m @ 2K, design value Ea =5 MV/m

• Annealing @800 K against Hydrogen contamination is

planned

• Design parameters are achieved. Proof of principle!

b 0.155

Frequency (MHz) 325.224

Cells 7

Length bl-def (mm) 505

Diameter (mm) 350

Ea (MV/m) 5

Ep/Ea 5.1

Bp/Ea [mT/(MV/m)] 13

CH-Cavity for Demonstrator @ 216.8 MHz

b 0.059

Frequency 216.816 MHz

Cells 15

Length bl-def (mm) 691

Diameter (mm) 409

Cell length 40.82

Ea (MV/m) 5.1

Bp/ Ea 5.2

Helium vessel

Helium in

Tuner flange Helium out

Dynamic

bellow

tuner

Production @ RI

delivery summer 2015

• Lower b lower frequency 2 x 108.408 MHz =216.816 MHz

• R&D on cavity, RF-couplers, bellow tuners

Cavity Production@RI (Bergisch Gladbach)

cavity inside rf-coupler flanges

bellow tuner cavity with end caps

Summary and Outlook II

HLI

Advanced Demonstrator Design

CH1 CH2 CH3 CH4 CH5

1 cryomodul

rebuncher

High Charge State-

Injektor

1.4 AMeV

Optimized Demonstrator Design

HLI

CH0 CH1 CH2 CH3 CH4 CH5 CH6 rebuncher CH7 CH8 CH9 CH10

CH

Demonstrators 1.4 AMeV 6 AMeV (heavy ions)

6 cryomodules High Charge State-

Injektor


Infrastructure, SHE-LINAC, HESR-research&MORE

Critical issues for HESR cooler

Critical and unresolved issues for 4.5-8MV and 1-3 A

- Power generation on terminal/solenoids in HV region

- Beam diagnostics and control

- Recuperation efficiency

Design work from Uppsala University (2009) based on

Research by Budker Institute for nuclear physics,

Novosibirsk (BINP)

HIM ACID adresses these issues by

- Cooler test stand

- R&D concerning power generation

Investigation of critical cooler issues at HIM/KPH:

2m

Collector

(+5kV, 1A)

Solenoid

with integ.

Wien filter

Solenoids

Beamline

(+26KV)

Gun (0KV)


Cooler R&D Highlights-I : Collector efficiency

HIM PhD student Max Bruker

with „his“ Cooler Test-stand

located in improvised laboratory in KPH

Selected results

-long term stable operation with

magnetized beam and decelleration

to very low collector potentials

- Demonstration of effective capture

of backstreaming electrons from collector,

- Very high capture efficiency leading

to ultra-low effective collector losses

(<10-6) for HESR cooler can be expected

- and will be demostrated in the near future

- Thesis can be finished in 2015


Cooler R&D Highlights-II: Thomson diagnostics

Thomson Laser experiment:

(PhD work Tobias Weilbach)

- Experiment now ready for data taking

- 300kW (peak) laser superimposed with 30mA (peak) electron beam

20ns pulse length, 100 kHz reprate

- Measured Laser background on PMT in 20cm distance from

primary beam (almost 1021 photons/s, 3*1014 e/s) is only 600 Hz . Expected signal 30Hz.

- Many orders of magnitude better S/N possible at real cooler

-PhD thesis can be completed 2015


Cooler R&D Highlights-III: Turbine powering

~40cm

Turbine runs as foreseen (5kW to load, enough to power 1/5

of all soelnoids of HESR cooler)

(but teething problems: first attempt stopped after 80 hours

Fabrication Quality control problem, not considered severe

air bearing turbine development ordered (1/2015)

SF6 optimized turbine ordered (1/2015)

ORC development project with U-Bayreuth started in 1/2015

2014: BINP Prototype for 700kV Stage

- BINP will make study for this device and its

possible extensions

- Protoype device in existing pressure vessel at BINP

- 5kW turbogen will be supplied by HIM

- Turbogen drives CT

- ± 30kV generated by CT stages + power on stage

- 12 Stages

- Reliability and perfomance tests of turbogen.

also at HIM

We believe that this scheme

is scalable Drawing: V. Reva, BINP

• Accelerator Physics and Integrated

Detectors: SUMMARY Projects up& running with promising first

results

• Will become far more productive as soon as

infrastructure becomes available in 2016

• Accelerator Physics and Integrated

Detectors

THANK YOU FOR YOUR ATTENTION!

Backup


Personal, Infrastructure, Projects, & Roadmaps to 2018

ACID-HESR (Cooler):

Acid Section Head:


Co-Section Head


ACID-SHE Linac:

Objective 2018:


8MV HESR cooler

Objective 2018:


multi cavity system

28 GHz-ECR ion source

RF injection

side

Beam extraction

side

GOAL:

- Higher Charge State higher energy gain

- Higher Charge State higher beam intensity without stripping

- Higher heavy ion beam intensity cw-/ pulse-mode operation

- Compact accelerator lower cost

ECR-projects/developments for heavy ion application:

- VENUS (LBNL)

- SERSE (INFN)

- SUSI (NSCL/MSU) -> FRIB (U33+/34+)

- MS-ECRIS@RIKEN (U35+)

- SECRAL (IMP-HIRFL) (U41+)

Bead pull measurements of the Field Profile

• Field profile is flat within 5% except the end gaps

Measured frequency changes

(1) Cavity without static tuners and tentative attached end caps

(2) Static tuners #1, #4, #6, #7 welded into the cavity

at 56 mm tuner height

(3) Left end cap welded to the cavity

(4) Static tuners #2, #8, #9 welded into the cavity


(5) Right end cap welded to the cavity

(6) 50 µm BCP treatment

(7) Static tuners #3, #5 welded into the cavity


(8) 25 µm BCP treatment

(9) 25 µm BCP treatment (optional)

(10) HPR

• Cold tests of the cavity @ IAP Frankfurt is

planned on April 2015

• Next step: welding of the He-vessel

Support Frame@CRYOGENIC (U.K.)

sc solenoid I

sc solenoid II

CH cavity

warm-cold-

transitionI

cold-warm-transitionI

Summary and Outlook

• Prototype of superconducting CH-cavity@325 MHz achieves design values

• Delivery of working CH-cavity @ 217 MHz is scheduled at 3 quarter of 2015

• Infrastructure @ GSI is almost ready

• Design of “short” CH-cavity

• Advantage:

simpler geometry without the girder lower production cost

simpler beam dynamics

• Disadvantage: poor field flatness lower energy gain

• Call for tender is ended, planned delivery @ end of 2016

• During the filling with LN2 occurred vacuum leakage due to temporary sealing

• Not whole cavity was covered with LN2

• The measured frequency shift is comparable to expectation

• The measurement allows extrapolation of resonance frequency @ 4K

Thermal shrinkage tested with LN2: Results

Temperature during the cool down Measured frequency shift

Thermal shrinkage tested with LN2@RI

• Frequency measurement @77K before welding of 2 last static tuners

2015-2018 Planned investments

Year Partner/purpose Amount k€

2015/16 Bayreuth:

ORC layout

180

2015-2017 BINP

600kV turbine

driven test-stage

~300

2015-2016 Air bearing

turbine

SF-6 optimized

300

2017-2018 Test stage with 3A

beam

200

Advanced R&D inside Accelerator Research&Development (HGF Program)

ARD-Folie

The power-problem: The 2MV device at Jülich

Each section contains;

- high-voltage power supply +/- 30 kV;

- power supply of the coils of the

magnetic field (2.5 A, 500 G);

- section of the cascade transformer for

powering of all electronic components;

33 high-voltage section V. V. Parchomchuk:

For higher voltages the Cascade transformer

will become inconvenient-unsuitable (Lossy&bulky)

Initially, a different solution was foreseen

Turbines as solution to the power-problem

Up to 2009: Different concept:

Power generation by gas-turbines

Abandoned due to unreliable turbines…..

Industrialiszation required. But:

Commercial market for small scale

turbogenerators was non-existent at that

time

12*700 kV device….(Drawing by V. Reva)

Open issue: industrialization of turbogens, SF6 operation and energy consumption (1MW for real cooler), enormous

space required for compressor Will be addressed by the ORC (Organic Rankine Cycle) project

Goal. 2015-2018 turbine powered multi MV generator

5kW Turbine Compressor for 5kW Turbine

Some important facts:

-Full concept will need ~1MW el.

Energy to generate 150kW floating power

- oper ation with SF6 desirable (required?)

- DEPRAG/ FH Amberg (summer 2013) :

Further R&D is interesting only

if related to “Energiewende issues”

2015-2016 The ORC study

-ORC is a method to gain electrical energy from

low temperature heat ( low Carnot efficiency)

- SF6 is a suitable ORC medium

- Low temperature heat 80-90 C is potentially

available at FAIR (exhaust Cryocompressors!)

ORC test stand at U-Bayreuth with 15kW DEPRAG turbogenerator

(heat generator order of magnitude smaller than compressor)

Strategic advantages:

- Promises dramatically reduced power requirement from HESR cooler

- Turbine competence from DEPRAG & FH Amberg may stay attached to our project

HIM prepares MOU with U-Bayreuth.

Bayreuth will investigate & plan the components and system layout

for a SF6 based ORC process at the turbine cooler

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