2011 Particle Accelerator Conference - List of Keywords (septum)

Paper	Title	Other Keywords	Page
MOP205	NSLS-II Injection Straight Diagnostics	injection, vacuum, kicker, diagnostics	477
	I. Pinayev, A. Blednykh, M.J. Ferreira, R.P. Fliller, B.N. Kosciuk, T.V. Shaftan, G.M. Wang BNL, Upton, Long Island, New York, USA
	The ultra-bright light source being developed by the NSLS-II project will utilize top-up injection and fine tuning of the injection process is mandatory. In the paper we present the diagnostics installed on the injection straight. Its usage for commissioning and tuning of the injection cycle is also described.

WEP092	Space Charge Effect of the High Intensity Proton Beam during the Resonance Extraction for the MU2E Experiment at Fermilab	space-charge, extraction, sextupole, resonance	1645
	C.S. Park, J.F. Amundson, J.A. Johnstone, V.P. Nagaslaev, S.J. Werkema Fermilab, Batavia, USA
	The proposed Mu2e experiment to search for direct μ to e conversion at Fermilab plans slow, resonant extraction of a beam with 3× 10¹² protons from the Debuncher ring. Space charge of this high intensity beam is a critical factor, since it induces significant betatron tune spread and consequently affects resonance extraction processes, such as spill uniformity and beam losses. This study shows the multi-particle simulation results in the early stages of resonance extraction and spill uniformity in the presence of 2D and 3D space charge effects.

WEP201	Status of NSLS-II Booster	booster, injection, extraction, dipole	1864
	S.M. Gurov, A. Akimov, O. Anchugov, A.M. Batrakov, E.A. Bekhtenev, O.V. Belikov, P.B. Cheblakov, V.P. Cherepanov, A.D. Chernyakin, V.G. Cheskidov, I.N. Churkin, A.N. Dubrovin, A. Erokhin, K. Gorchakov, S.E. Karnaev, G.V. Karpov, V.A. Kiselev, V.V. Kobets, V.V. Kolmogorov, V.M. Konstantinov, A.A. Korepanov, E.A. Kuper, V. Kuzminykh, E.B. Levichev, V.R. Mamkin, A.S. Medvedko, O.I. Meshkov, N. Nefedov, V.V. Neyfeld, I.N. Okunev, M. Petrichenkov, V.V. Petrov, A. Polyansky, D.N. Pureskin, A. Rakhimov, S.I. Ruvinsky, T.V. Rybitskaya, L.M. Schegolev, A.V. Semenov, D.V. Senkov, S.S. Serednyakov, S.V. Shiyankov, D.A. Shvedov, S.V. Sinyatkin, V.V. Smaluk, A.V. Sukhanov, L. Tsukanova, A.V. Utkin, K. Yaminov BINP SB RAS, Novosibirsk, Russia J.H. DeLong, R.P. Fliller, G. Ganetis, H.-C. Hseuh, I. Pinayev, T.V. Shaftan, S.K. Sharma, O. Singh, Y. Tian, F.J. Willeke BNL, Upton, Long Island, New York, USA P.A.E. Elkiaer Danfysik A/S, Jyllinge, Denmark
	The National Synchrotron Light Source II is a third generation light source under construction at Brookhaven National Laboratory. The project includes a highly optimized 3 GeV electron storage ring, linac pre-injector and full-energy booster-synchrotron. Budker Institute of Nuclear Physics builds booster for NSLS-II. The booster should accelerate the electron beam continuously and reliably from minimal 170 MeV injection energy to maximal energy of 3.15 GeV and average beam current of 20 mA. The booster shall be capable of multi-bunch and single bunch operation. This paper summarizes the status of NSLS-II booster and the main designed parameters.

THP105	Final Design of ILC RTML Extraction Line for Single Stage Bunch Compressor	extraction, sextupole, kicker, damping	2321
	S. Seletskiy BNL, Upton, Long Island, New York, USA N. Solyak Fermilab, Batavia, USA
	The use of single stage bunch compressor (BC) in the International Linear Collider (ILC) [1] Damping Ring to the Main Linac beamline (RTML) requires new design for the extraction line (EL). The EL located downstream of the BC will be used for both an emergency abort dumping of the beam and the tune-up continuous train-by-train extraction. It must accept both compressed and uncompressed beam with energy spread of 3.54% and 0.15% respectively. In this paper we report the final design that allowed minimizing the length of such extraction line while offsetting the beam dumps from the main line by 5m distance required for acceptable radiation level in the service tunnel. Proposed extraction line can accommodate beams with different energy spreads at the same time providing the beam size suitable for the aluminum ball dump window.

THP131	Injection Straight Pulsed Magnet Error Tolerance Study for Top-off Injection	injection, kicker, simulation, betatron	2366
	G.M. Wang, R.P. Fliller, R. Heese, S. Kowalski, B. Parker, T.V. Shaftan, F.J. Willeke BNL, Upton, Long Island, New York, USA
	Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886 NSLS II is designed to work in top-off injection mode. The goal is to minimize the disturbance of the injection transient on the users. The injection straight includes a septum and four fast kicker magnets. The pulsed magnet errors will excite a betatron oscillation. This paper gives the formulas of each error contribution to the oscillation amplitude at various source points in the ring. These are compared with simulation results. Based on the simple formulas, we can specify the error tolerances on the pulsed magnets and scale it to similar machines.

THP134	Lifetime Measurement with Pseudo Moveable Septum in NSLS X-ray Ring	injection, closed-orbit, kicker, vacuum	2375
	G.M. Wang, J. Choi, R. Heese, S.L. Kramer, T.V. Shaftan, X. Yang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886 The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source currently under construction at Brookhaven National Laboratory and starts to commission in 2014. The beam injection works with two septa and four fast kicker magnets in an injection section. To improve the injection stability and reproducibility, we plan to implement a slow local bump on top of the fast bump so that the fast kicker strength is reduced. This bump works as a pseudo movable septum. We can also use this ‘movable’ septum to measure the storage ring beam partial lifetime resulting from the septum edge and possibly increasing the lifetime by moving the stored beam orbit away from the edge. We demonstrate the feasibility of this idea, by implementing DC bump in NSLS X-ray ring. We report the results of beam lifetime measurements as a function of the amplitude of this bumped orbit relative to the septum and the idea of a slow bump that could reduce the fast bump magnet strengths.

THP135	Implementation of a DC Bump at the Storage Ring Injection Straight Section	injection, kicker, storage-ring, vacuum	2378
	G.M. Wang, R.P. Fliller, W. Guo, R. Heese, S.L. Kramer, B. Parker, T.V. Shaftan, C.J. Spataro, F.J. Willeke, L.-H. Yu BNL, Upton, Long Island, New York, USA
	Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886 The NSLS II beam injection works with two septa and four fast kicker magnets. The kicker power supplies each produce a two revolution periods pulsed field, 5.2μs half sine waveform, using ~5kV drive voltage. The corresponding close orbit bump amplitude is ~15mm. It is desired that the bump they produce is transparent to the users for top-off injection. However, high voltage and short pulse power supplies have challenges to maintain pulse-to-pulse stability and magnet-to-magnet reproducibility. To minimize these issues, we propose to implement a DC local bump on top of the fast bump to reduce the fast kicker strength by a factor of 2/3. This bump uses two ring corrector magnets plus one additional magnet at the septum to create a bump. Additionally, these magnets could provide a DC bump, which would simulate the effects of a movable septum on the store beam lifetime. This paper presents the detail design of this DC injection bump and related beam dynamics.

THP214	Pulsed Multipole Injection for the MAX IV Storage Rings	injection, storage-ring, multipole, sextupole	2522
	S.C. Leemann MAX-lab, Lund, Sweden
	The MAX IV facility presently under construction will include two storage rings for the production of synchrotron radiation. The 3 GeV ring will house insertion devices for the production for x-rays while the 1.5 GeV ring will serve UV and IR users. Both rings will be operated at a constant 500 mA of stored current with top-up shots supplied by the 3.5 GeV MAX IV linac acting as a full-energy injector. So far, injection into both storage rings has been designed using a conventional approach: a closed four-kicker injection bump brings the stored beam to the septum blade where the injected bunches are captured in a single turn. Recently, studies have been carried out to investigate the feasibility of using a pulsed multipole for injection into the storage rings. Pulsed multipole injection does not require an injection bump and has the potential to make top-up injection transparent to users. This paper reports on these studies and summarizes requirements for the pulsed sextupole magnet to be installed for injection into the MAX IV storage rings.

THP216	Progress with NSLS-II Injection Straight Section Design	injection, kicker, storage-ring, vacuum	2528
	T.V. Shaftan, A. Blednykh, W.R. Casey, L.R. Dalesio, R. Faussete, M.J. Ferreira, R.P. Fliller, G. Ganetis, R. Heese, H.-C. Hseuh, P.K. Job, E.D. Johnson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, D. Padrazo, B. Parker, I. Pinayev, S.K. Sharma, O. Singh, C.J. Spataro, G.M. Wang, F.J. Willeke BNL, Upton, Long Island, New York, USA
	Funding: This work is supported by U.S. DOE, Contract No.DE-AC02-98CH10886 NSLS-II injection straight section consists of the pulsed and DC/Slow bumps, septa system, beam trajectory correction and diagnostics systems. In this paper we discuss overall injection straight layout, preliminary element designs, specifications for the pulsed and DC magnets and their power supplies, vacuum devices and chambers and diagnostics devices.

Paper

Title

Other Keywords

Page

MOP205

NSLS-II Injection Straight Diagnostics

injection, vacuum, kicker, diagnostics

477

I. Pinayev, A. Blednykh, M.J. Ferreira, R.P. Fliller, B.N. Kosciuk, T.V. Shaftan, G.M. Wang
BNL, Upton, Long Island, New York, USA

The ultra-bright light source being developed by the NSLS-II project will utilize top-up injection and fine tuning of the injection process is mandatory. In the paper we present the diagnostics installed on the injection straight. Its usage for commissioning and tuning of the injection cycle is also described.

WEP092

Space Charge Effect of the High Intensity Proton Beam during the Resonance Extraction for the MU2E Experiment at Fermilab

space-charge, extraction, sextupole, resonance

1645

C.S. Park, J.F. Amundson, J.A. Johnstone, V.P. Nagaslaev, S.J. Werkema
Fermilab, Batavia, USA

The proposed Mu2e experiment to search for direct μ to e conversion at Fermilab plans slow, resonant extraction of a beam with 3× 10¹² protons from the Debuncher ring. Space charge of this high intensity beam is a critical factor, since it induces significant betatron tune spread and consequently affects resonance extraction processes, such as spill uniformity and beam losses. This study shows the multi-particle simulation results in the early stages of resonance extraction and spill uniformity in the presence of 2D and 3D space charge effects.

WEP201

Status of NSLS-II Booster

booster, injection, extraction, dipole

1864

S.M. Gurov, A. Akimov, O. Anchugov, A.M. Batrakov, E.A. Bekhtenev, O.V. Belikov, P.B. Cheblakov, V.P. Cherepanov, A.D. Chernyakin, V.G. Cheskidov, I.N. Churkin, A.N. Dubrovin, A. Erokhin, K. Gorchakov, S.E. Karnaev, G.V. Karpov, V.A. Kiselev, V.V. Kobets, V.V. Kolmogorov, V.M. Konstantinov, A.A. Korepanov, E.A. Kuper, V. Kuzminykh, E.B. Levichev, V.R. Mamkin, A.S. Medvedko, O.I. Meshkov, N. Nefedov, V.V. Neyfeld, I.N. Okunev, M. Petrichenkov, V.V. Petrov, A. Polyansky, D.N. Pureskin, A. Rakhimov, S.I. Ruvinsky, T.V. Rybitskaya, L.M. Schegolev, A.V. Semenov, D.V. Senkov, S.S. Serednyakov, S.V. Shiyankov, D.A. Shvedov, S.V. Sinyatkin, V.V. Smaluk, A.V. Sukhanov, L. Tsukanova, A.V. Utkin, K. Yaminov
BINP SB RAS, Novosibirsk, Russia
J.H. DeLong, R.P. Fliller, G. Ganetis, H.-C. Hseuh, I. Pinayev, T.V. Shaftan, S.K. Sharma, O. Singh, Y. Tian, F.J. Willeke
BNL, Upton, Long Island, New York, USA
P.A.E. Elkiaer
Danfysik A/S, Jyllinge, Denmark

The National Synchrotron Light Source II is a third generation light source under construction at Brookhaven National Laboratory. The project includes a highly optimized 3 GeV electron storage ring, linac pre-injector and full-energy booster-synchrotron. Budker Institute of Nuclear Physics builds booster for NSLS-II. The booster should accelerate the electron beam continuously and reliably from minimal 170 MeV injection energy to maximal energy of 3.15 GeV and average beam current of 20 mA. The booster shall be capable of multi-bunch and single bunch operation. This paper summarizes the status of NSLS-II booster and the main designed parameters.

THP105

Final Design of ILC RTML Extraction Line for Single Stage Bunch Compressor

extraction, sextupole, kicker, damping

2321

S. Seletskiy
BNL, Upton, Long Island, New York, USA
N. Solyak
Fermilab, Batavia, USA

The use of single stage bunch compressor (BC) in the International Linear Collider (ILC) [1] Damping Ring to the Main Linac beamline (RTML) requires new design for the extraction line (EL). The EL located downstream of the BC will be used for both an emergency abort dumping of the beam and the tune-up continuous train-by-train extraction. It must accept both compressed and uncompressed beam with energy spread of 3.54% and 0.15% respectively. In this paper we report the final design that allowed minimizing the length of such extraction line while offsetting the beam dumps from the main line by 5m distance required for acceptable radiation level in the service tunnel. Proposed extraction line can accommodate beams with different energy spreads at the same time providing the beam size suitable for the aluminum ball dump window.

THP131

Injection Straight Pulsed Magnet Error Tolerance Study for Top-off Injection

injection, kicker, simulation, betatron

2366

G.M. Wang, R.P. Fliller, R. Heese, S. Kowalski, B. Parker, T.V. Shaftan, F.J. Willeke
BNL, Upton, Long Island, New York, USA

Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886
NSLS II is designed to work in top-off injection mode. The goal is to minimize the disturbance of the injection transient on the users. The injection straight includes a septum and four fast kicker magnets. The pulsed magnet errors will excite a betatron oscillation. This paper gives the formulas of each error contribution to the oscillation amplitude at various source points in the ring. These are compared with simulation results. Based on the simple formulas, we can specify the error tolerances on the pulsed magnets and scale it to similar machines.

THP134

Lifetime Measurement with Pseudo Moveable Septum in NSLS X-ray Ring

injection, closed-orbit, kicker, vacuum

2375

G.M. Wang, J. Choi, R. Heese, S.L. Kramer, T.V. Shaftan, X. Yang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886
The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source currently under construction at Brookhaven National Laboratory and starts to commission in 2014. The beam injection works with two septa and four fast kicker magnets in an injection section. To improve the injection stability and reproducibility, we plan to implement a slow local bump on top of the fast bump so that the fast kicker strength is reduced. This bump works as a pseudo movable septum. We can also use this ‘movable’ septum to measure the storage ring beam partial lifetime resulting from the septum edge and possibly increasing the lifetime by moving the stored beam orbit away from the edge. We demonstrate the feasibility of this idea, by implementing DC bump in NSLS X-ray ring. We report the results of beam lifetime measurements as a function of the amplitude of this bumped orbit relative to the septum and the idea of a slow bump that could reduce the fast bump magnet strengths.

THP135

Implementation of a DC Bump at the Storage Ring Injection Straight Section

injection, kicker, storage-ring, vacuum

2378

G.M. Wang, R.P. Fliller, W. Guo, R. Heese, S.L. Kramer, B. Parker, T.V. Shaftan, C.J. Spataro, F.J. Willeke, L.-H. Yu
BNL, Upton, Long Island, New York, USA

Funding: Work supported by U.S. DOE, Contract No.DE-AC02-98CH10886
The NSLS II beam injection works with two septa and four fast kicker magnets. The kicker power supplies each produce a two revolution periods pulsed field, 5.2μs half sine waveform, using ~5kV drive voltage. The corresponding close orbit bump amplitude is ~15mm. It is desired that the bump they produce is transparent to the users for top-off injection. However, high voltage and short pulse power supplies have challenges to maintain pulse-to-pulse stability and magnet-to-magnet reproducibility. To minimize these issues, we propose to implement a DC local bump on top of the fast bump to reduce the fast kicker strength by a factor of 2/3. This bump uses two ring corrector magnets plus one additional magnet at the septum to create a bump. Additionally, these magnets could provide a DC bump, which would simulate the effects of a movable septum on the store beam lifetime. This paper presents the detail design of this DC injection bump and related beam dynamics.

THP214

Pulsed Multipole Injection for the MAX IV Storage Rings

injection, storage-ring, multipole, sextupole

2522

S.C. Leemann
MAX-lab, Lund, Sweden

The MAX IV facility presently under construction will include two storage rings for the production of synchrotron radiation. The 3 GeV ring will house insertion devices for the production for x-rays while the 1.5 GeV ring will serve UV and IR users. Both rings will be operated at a constant 500 mA of stored current with top-up shots supplied by the 3.5 GeV MAX IV linac acting as a full-energy injector. So far, injection into both storage rings has been designed using a conventional approach: a closed four-kicker injection bump brings the stored beam to the septum blade where the injected bunches are captured in a single turn. Recently, studies have been carried out to investigate the feasibility of using a pulsed multipole for injection into the storage rings. Pulsed multipole injection does not require an injection bump and has the potential to make top-up injection transparent to users. This paper reports on these studies and summarizes requirements for the pulsed sextupole magnet to be installed for injection into the MAX IV storage rings.

THP216

Progress with NSLS-II Injection Straight Section Design

injection, kicker, storage-ring, vacuum

2528

T.V. Shaftan, A. Blednykh, W.R. Casey, L.R. Dalesio, R. Faussete, M.J. Ferreira, R.P. Fliller, G. Ganetis, R. Heese, H.-C. Hseuh, P.K. Job, E.D. Johnson, B.N. Kosciuk, S. Kowalski, S.L. Kramer, D. Padrazo, B. Parker, I. Pinayev, S.K. Sharma, O. Singh, C.J. Spataro, G.M. Wang, F.J. Willeke
BNL, Upton, Long Island, New York, USA

Funding: This work is supported by U.S. DOE, Contract No.DE-AC02-98CH10886
NSLS-II injection straight section consists of the pulsed and DC/Slow bumps, septa system, beam trajectory correction and diagnostics systems. In this paper we discuss overall injection straight layout, preliminary element designs, specifications for the pulsed and DC magnets and their power supplies, vacuum devices and chambers and diagnostics devices.