HIAT2022 - List of Authors (Podlech, H.)

Paper	Title	Page
TUP10	High Power Tests of a New 4-Rod RFQ with Focus on Thermal Stability	93
	S.R. Wagner, D. Koser, H. Podlech IAP, Frankfurt am Main, Germany M. Basten GSI, Darmstadt, Germany M. Basten HIM, Mainz, Germany H. Podlech HFHF, Frankfurt am Main, Germany
	Due to strong limitations regarding operational stability of the existing HLI-RFQ a new design and prototype were commissioned. Three main problems were observed at the existing RFQ: A strong thermal sensitivity, modulated reflected power, and insufficient stability of the contact springs connecting the stems with the tuning plates. Although the last problem was easily solved, the first two remained and greatly hindered operations. To resolve this issue and ensure stable injection into the HLI, a new RFQ-prototype, optimized in terms of vibration suppression and cooling efficiency, was designed at the Institute of Applied Physics (IAP) of Goethe University Frankfurt. To test the performance of this prototype, high power tests with more than 25 kW/m were performed at GSI. During those, it was possible to demonstrate operational stability in terms of thermal load and mechanical vibrations, calculating the thermal detuning, and proof the reliability of the proposed design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP10
About •	Received ※ 21 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 30 September 2022 — Issue date ※ 30 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3C2	Alternating Phase Focusing Based IH DTL for Heavy Ion Application	162
	S. Lauber, K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, P. Forck, V. Gettmann, T. Kürzeder, J. List, M. Miski-Oglu, A. Rubin, S. Yaramyshev GSI, Darmstadt, Germany K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, S. Yaramyshev HIM, Mainz, Germany K. Aulenbacher, W.A. Barth, F.D. Dziuba, S. Lauber, J. List KPH, Mainz, Germany M. Droba, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany H. Podlech HFHF, Frankfurt am Main, Germany
	The continuous wave (CW) operated HElmholtz LInear ACcelerator (HELIAC) is going to reach the next milestone with the commissioning of the superconducting (SC) Advanced Demonstrator cryomodule, comprising four SC Crossbar H-mode (CH) cavities and SC steerer magnets. In parallel with the commissioning of the SC main accelerator, the normal conducting injector consisting of an ECR ion source, a RFQ and two Interdigital H-mode (IH) cavities will be built based on an Alternating Phase Focusing (APF) beam dynamics scheme. Both IH cavities will provide a beam energy gain from 300 keV/u to 1400 keV/u with a maximum mass to charge ratio of 6, requiring only one external quadrupole triplet and beam steerer elements between them. The APF concept allows stable and effective beam transport with transverse and longitudinal focusing, enabling an efficient and compact design. Due to the stringent requirements of the APF concept on the voltage distribution and the CW operation, optimization of each cavity in terms of RF, mechanical and thermal properties is crucial for successful operation of the HELIAC injector. The current layout of the APF based and CW operated injector will be presented.
	Slides TH3C2 [1.603 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH3C2
About •	Received ※ 21 June 2022 — Revised ※ 04 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP07	Efficient Heavy Ion Acceleration with High Brilliance	83
	C. Zhang GSI, Darmstadt, Germany H. Podlech IAP, Frankfurt am Main, Germany
	It is challenging to realize an efficient and brilliant RFQ for accelerating high current heavy ion beams, as space charge effects are most pronounced at the low energy end. Here ’efficient’ means an as short as pos-sible accelerating structure with minimum RF power consumption, while ’brilliant’ means high beam transmission and low emittance growth. Using the > 9 m long HSI RFQ accelerator, one of the longest RFQs in the world, as an example, a promising solution has been presented.
	Poster TUP07 [1.134 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP07
About •	Received ※ 21 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP09	Tuning and RF Measurements of the LILAC RFQ	90
	H. Podlech IAP, Frankfurt am Main, Germany H. Höltermann, H. Hähnel, B. Koubek, U. Ratzinger BEVATECH, Frankfurt, Germany
	A new linac for the NICA ion collider is under con-struction for JINR at BEVATECH GmbH. As first cavity the 2.5 m long RFQ was manufactured. Within this length it accelerates particles with a mass to charge ratio up to three to an energy of 600 keV/u. The operation frequency is 162.5 MHz and the 4-Rod structure consists of 23 RF cells that need to be adjusted using tuning blocks in order to provide the required field distribution along the electrodes. The status of the manufacturing and the upcoming tuning process including the overall RF setup of the RFQ are summarized in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP09
About •	Received ※ 24 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1C4	Cavity Designs for the CH3 to CH11 and Bellow Tuner Investigation of the Superconducting Heavy Ion Accelerator HELIAC	140
	T. Conrad, H. Podlech, M. Schwarz IAP, Frankfurt am Main, Germany K. Aulenbacher, W.A. Barth, F.D. Dziuba, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu HIM, Mainz, Germany K. Aulenbacher IKP, Mainz, Germany W.A. Barth, M. Basten, F.D. Dziuba, V. Gettmann, M. Heilmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, A. Rubin, A. Schnase, S. Yaramyshev GSI, Darmstadt, Germany
	New CH-DTL cavities designs of the planned Helmholtz Linear Accelerator (HELIAC) are developed in collaboration of GSI, HIM and IAP Frankfurt. The in cw-mode operating linac with a final energy of 7.3 MeV/u, is intended for various experiments, in particular with heavy ions at energies close to the Coulomb barrier for research on SHE. Twelve sc CH cavities are foreseen, divided into four different cryostats each equipped with two dynamic bellow tuner. After successful beam tests with CH0, CH3 to CH11 were designed. Based on the experience gained so far, optimizations were made, which will lead to both an increase in performance in terms of reducing the peak fields limiting superconductivity and a reduction in manufacturing costs and time. In order to optimize manufacturing, attention was paid to design many parts of the cavity, such as lids, spokes, tuner and helium shell, with the same geometrical dimensions. In addition, a tuner test rig was developed, which will be used to investigate the mechanical properties of the bellow tuner. For this purpose, different simulations were made in order to realize conditions as close as possible to reality in the test rig.
	Slides TH1C4 [6.439 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH1C4
About •	Received ※ 27 June 2022 — Revised ※ 19 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

High Power Tests of a New 4-Rod RFQ with Focus on Thermal Stability

93

S.R. Wagner, D. Koser, H. Podlech
IAP, Frankfurt am Main, Germany
M. Basten
GSI, Darmstadt, Germany
M. Basten
HIM, Mainz, Germany
H. Podlech
HFHF, Frankfurt am Main, Germany

Due to strong limitations regarding operational stability of the existing HLI-RFQ a new design and prototype were commissioned. Three main problems were observed at the existing RFQ: A strong thermal sensitivity, modulated reflected power, and insufficient stability of the contact springs connecting the stems with the tuning plates. Although the last problem was easily solved, the first two remained and greatly hindered operations. To resolve this issue and ensure stable injection into the HLI, a new RFQ-prototype, optimized in terms of vibration suppression and cooling efficiency, was designed at the Institute of Applied Physics (IAP) of Goethe University Frankfurt. To test the performance of this prototype, high power tests with more than 25 kW/m were performed at GSI. During those, it was possible to demonstrate operational stability in terms of thermal load and mechanical vibrations, calculating the thermal detuning, and proof the reliability of the proposed design.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP10

About •

Received ※ 21 June 2022 — Revised ※ 10 August 2022 — Accepted ※ 30 September 2022 — Issue date ※ 30 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH3C2

Alternating Phase Focusing Based IH DTL for Heavy Ion Application

162

S. Lauber, K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, P. Forck, V. Gettmann, T. Kürzeder, J. List, M. Miski-Oglu, A. Rubin, S. Yaramyshev
GSI, Darmstadt, Germany
K. Aulenbacher, W.A. Barth, M. Basten, C. Burandt, F.D. Dziuba, V. Gettmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, S. Yaramyshev
HIM, Mainz, Germany
K. Aulenbacher, W.A. Barth, F.D. Dziuba, S. Lauber, J. List
KPH, Mainz, Germany
M. Droba, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany
H. Podlech
HFHF, Frankfurt am Main, Germany

The continuous wave (CW) operated HElmholtz LInear ACcelerator (HELIAC) is going to reach the next milestone with the commissioning of the superconducting (SC) Advanced Demonstrator cryomodule, comprising four SC Crossbar H-mode (CH) cavities and SC steerer magnets. In parallel with the commissioning of the SC main accelerator, the normal conducting injector consisting of an ECR ion source, a RFQ and two Interdigital H-mode (IH) cavities will be built based on an Alternating Phase Focusing (APF) beam dynamics scheme. Both IH cavities will provide a beam energy gain from 300 keV/u to 1400 keV/u with a maximum mass to charge ratio of 6, requiring only one external quadrupole triplet and beam steerer elements between them. The APF concept allows stable and effective beam transport with transverse and longitudinal focusing, enabling an efficient and compact design. Due to the stringent requirements of the APF concept on the voltage distribution and the CW operation, optimization of each cavity in terms of RF, mechanical and thermal properties is crucial for successful operation of the HELIAC injector. The current layout of the APF based and CW operated injector will be presented.

Slides TH3C2 [1.603 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH3C2

About •

Received ※ 21 June 2022 — Revised ※ 04 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP07

Efficient Heavy Ion Acceleration with High Brilliance

83

C. Zhang
GSI, Darmstadt, Germany
H. Podlech
IAP, Frankfurt am Main, Germany

It is challenging to realize an efficient and brilliant RFQ for accelerating high current heavy ion beams, as space charge effects are most pronounced at the low energy end. Here ’efficient’ means an as short as pos-sible accelerating structure with minimum RF power consumption, while ’brilliant’ means high beam transmission and low emittance growth. Using the > 9 m long HSI RFQ accelerator, one of the longest RFQs in the world, as an example, a promising solution has been presented.

Poster TUP07 [1.134 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP07

About •

Received ※ 21 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP09

Tuning and RF Measurements of the LILAC RFQ

90

H. Podlech
IAP, Frankfurt am Main, Germany
H. Höltermann, H. Hähnel, B. Koubek, U. Ratzinger
BEVATECH, Frankfurt, Germany

A new linac for the NICA ion collider is under con-struction for JINR at BEVATECH GmbH. As first cavity the 2.5 m long RFQ was manufactured. Within this length it accelerates particles with a mass to charge ratio up to three to an energy of 600 keV/u. The operation frequency is 162.5 MHz and the 4-Rod structure consists of 23 RF cells that need to be adjusted using tuning blocks in order to provide the required field distribution along the electrodes. The status of the manufacturing and the upcoming tuning process including the overall RF setup of the RFQ are summarized in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TUP09

About •

Received ※ 24 June 2022 — Revised ※ 27 June 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1C4

Cavity Designs for the CH3 to CH11 and Bellow Tuner Investigation of the Superconducting Heavy Ion Accelerator HELIAC

140

T. Conrad, H. Podlech, M. Schwarz
IAP, Frankfurt am Main, Germany
K. Aulenbacher, W.A. Barth, F.D. Dziuba, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu
HIM, Mainz, Germany
K. Aulenbacher
IKP, Mainz, Germany
W.A. Barth, M. Basten, F.D. Dziuba, V. Gettmann, M. Heilmann, T. Kürzeder, S. Lauber, J. List, M. Miski-Oglu, A. Rubin, A. Schnase, S. Yaramyshev
GSI, Darmstadt, Germany

New CH-DTL cavities designs of the planned Helmholtz Linear Accelerator (HELIAC) are developed in collaboration of GSI, HIM and IAP Frankfurt. The in cw-mode operating linac with a final energy of 7.3 MeV/u, is intended for various experiments, in particular with heavy ions at energies close to the Coulomb barrier for research on SHE. Twelve sc CH cavities are foreseen, divided into four different cryostats each equipped with two dynamic bellow tuner. After successful beam tests with CH0, CH3 to CH11 were designed. Based on the experience gained so far, optimizations were made, which will lead to both an increase in performance in terms of reducing the peak fields limiting superconductivity and a reduction in manufacturing costs and time. In order to optimize manufacturing, attention was paid to design many parts of the cavity, such as lids, spokes, tuner and helium shell, with the same geometrical dimensions. In addition, a tuner test rig was developed, which will be used to investigate the mechanical properties of the bellow tuner. For this purpose, different simulations were made in order to realize conditions as close as possible to reality in the test rig.

Slides TH1C4 [6.439 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-HIAT2022-TH1C4

About •

Received ※ 27 June 2022 — Revised ※ 19 July 2022 — Accepted ※ 10 August 2022 — Issue date ※ 19 September 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)